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HP 8903B Service Vol..

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1. 10 20k 20 100 1k 10k 20k FREQUENCY H2 FREQUENCY Hz Figure 88 30 CCIR ARM Weighting Filter Figure 8 31 CCIR ARM Weighting Filter Ul Pin 8 A2TP3 8 30 Model 8903 Service PRINCIPLES OF OPERATION SERVICE SHEET 3 SERVICE SHEET 3 A3 Notch Filter Assembly Notch Generating Circuits PRINCIPLES OF OPERATION General This portion of the Notch Filter Assembly A3 contains the basic notch generating circuitry which includes two integrators two sum amplifiers and their control circuitry Integrators The two integrators are nearly identical A simplified diagram of an integrator is shown in Figure 8B 32 For Integrator 1 FETs Q30 through Q32 switch the feedback capacitors to change ranges FETs Q14 through Q21 switch the input resistors to coarse tune the filter The FETs are driven by the Notch Control Drivers whose control inputs come from the Controller via the Latch Assembly see Service Sheets 12 and 13 Figure 8 32 Integrator Circuit Sum Amplifiers Sum Amplifiers 1 and 2 and the Sum and Output Amplifier sum various signals in the proportion and phase relationship required by the state variable design See the discussion of the Notch Filter on Service Sheet BD2 The Sum and Output Amplifier has inputs which are switched by FETs 11 and Q12 to control the type of filter response namely notch bandpass or flat Q1
2. 8 T s ASSEMBLY 0890 3 601 29 INTEBRATOR P O FROM LATCH 0150 12 NO x VREF 8 R2F l 33k 3 d 2 b Static Sensitive l Devices l l 45V F C52 4 COMPARATOR Pe GAIN SWITCH T 0 044 19 6k 1470 115V R83 R49 R54 30 TO 30 mVDC TELA T 2450 100k m 1780 0 01 ass 02 40 44 5 5 1 45 3 med ep 4 8000 40 TO 40 mVDC TUNE SE P R89 70 0 19 6k 19 6k R46 R NF 2 11 111k A 100k 6190 1 4 VERTING AMPLIFIER 15V F 8 cag 15V ERIN 9 OFST 541 0 014 45V F R62 100k BRA C39 R90 C38 198k Re7 33 11 111k 4 7 ae 514 15V F 4 QUADRANT 3 NOTCH 1 i MULTIPLIER GAINs11 UST 19 P O A13 SS Pd 35 om BALANCE INTEGRATOR FROM OUTPUT 45V AMPLIFIER OL joue i GO 1 AMPLIFIER 5 i R35 VOLTMETER ii INT gt gt oa T i 15V F 10 TO 10myDU 15 F oo BALANCE MULTIPLIER 10 5 TO 9 5 VDC 15 C30 R3B 15V F 400 100
3. Qty Tuble 6 3 Replaceable Parts Description Mfr P Code COMPARATOR GP QUAD 14 DIP P 01295 IC COMPARATOR GP QUAD 14 DIP P PKG 01295 COMPARATOR GP QUAD 14 DIP P 01295 IC SWITCH ANLG QUAD 16 DIP C PKG 27014 COMPARATOR GP QUAD 14 01295 DIODE ZNR 5 1 5 DO 35 PD 4W TC 035 28480 DIODE ZNR 5 1V 5 DO 35 PD 4W TC 035 28480 DIODE ZNR 2 4V 5 00 35 PD 4W 037 28480 DIODE ZNR 6 8V 5 00 35 PDz 4W 057 28480 DIODE 2NR 1N827 6 2 5 DO 7 PDz 4W 24046 DIODE ZNR 7 5V 5 DO 35 PDz 4W 062 28480 Factery Selected Component Refer to Sectinu 5 Replaceable Parts Mfr Part Number LM339N LM339N LM339N LF132010 LM339N 1902 0951 1902 0951 1902 0943 1902 0954 1N827 1992 0955 Errata part change 6 57 Model 8903B Table 6 3 Replaceable Parts Replaceable Parts Reference C Mfr ty Description Mfr Part Number Designation Number D Code A6 08903 60132 9 1 OUTPUT ATTENUATOR ASSEMBLY 28480 08903 60132 8 1 0180 0116 1 21 CAPACITOR FXD 6 8UF 10 35 56289 150D685X9035B2 2 ASSIGNED 0180 0116 CAPACITOR FXD 6 8UF 10 35VDC 56289 1500685 9035 2 6 4 0180 0116 1 CAPACITOR FXD 6 8UF 10 35VDC 56289 150D885X9035B2 6 5 0180 0116 1 CAPACITOR FXD 6 8UF 10 35VDC 56289 1500685 903582 ASCE NOT ASSIGNED A6C7 0180 0116 1 CAPACITOR FXD 6 8UF 10 35V
4. 1 flows through transistors Q2A and and into the output of U4 Q2A is a common base stage is configured as a diode The current 14 through Q2A and Q1A produces a voltage across each base emitter junction proportional to the log of the current The sum of the two base emitter voltages V is the sum of two nearly identical logarithms and is proportional to the log of the square of the current log 1 2 and hence the log of the square of the input voltage log Vin The identity used here is log I log I log I x I log 12 Now consider the operation of the Filter Amplifier which also functions as an antilog circuit The collector current 14 of Q1B is filtered by U3 and the associated resistors and capacitors R90 R91 R92 R94 C53 and C56 The dc component of this current flows through R90 R91 and R92 and produces a voltage which when buffered by U2 is the output Voy of the circuit The effects of R93 and R95 the schematic are being momentarily ignored U3 also holds the collector of Q1B at ground potential to establish the offset of the output at The collector current 15 of Q2B is generated by the output voltage Voy which appears across R98 012 holds the collector of Q2B and one end of R98 at ground potential The voltage across the base emitter junctions of Q1B and Q2B is proportional to the log of their respective collector currents The sum of the two base emitter voltages V
5. 24 CONT DIP SLDR 28480 1200 0541 1818 3747 4 1 ROM PROG 7 28480 1818 3747 1200 0511 1 SOCKET IC 24 CONT DIP DIP SLDR 28480 1200 0541 8013 1818 3746 3 1 ROM PROG 6 28480 1818 3746 ABU14 1820 1193 5 IC CNTR TTL LS BIN ASYNCHRO 01295 SN74LS197N ABU15 1820 1193 5 IC CNTR TTL LS BIN ASYNCHRO 01285 SN74LS197N 81 16 1820 1287 8 1 IC BFR TTL LS QUAD 2 INP 01295 SN74ALS37N A8U17 1820 1417 G GATE TTL LS NAND QUAD 2 INP 01295 SN74LS26N 1200 0638 7 SOCKET IC 14 CONT DIP SLDR 28480 1200 0638 A8U18 1820 1199 1 IC INV TTL LS 1 INP 01295 SN741 S04N 8019 1820 1202 7 IC GATE TTL LS NAND TPL 3 NP 01295 SN741S10N ABU 20 1820 1190 1 IC INV TTL LS HEX 1 INP 01295 SN74LS04N 21 1820 1216 3 IC TTL LS 3 TO 8 LINE 3 INP 01295 SN74LS138N ABU22 1820 1216 3 TIL LS 3 TO 8 LINE 3 INP 01295 SH74LS138N ABU 23 1820 0174 0 1 IC TTL 01295 SN74U4N 81 24 1820 1418 1 OCDR TTL LS BCO TO DEC 4 10 01295 SN74LS42N 8025 NOT ASSIGNED 1200 0541 1 SOCKET IC 24 CONT DIP DiP SLDR 28480 1200 0541 1200 0541 1 SOCKET IC 24 CONT DIP DIP SLDR 28480 1200 0541 2450 TO 2520 4 80726 08903 89024 0 1 9 28480 08903 80024 1200 0541 1 SOCKET IC 24 CONT DIP DIP SLDR 28480 1200 0541 48727 08901 80023 9 1 8 28480 08903 80023 1200 0541 1 SOCKET IC 24 CONT DIP DIP SLDH 28480 1200 0541 48028 08903 80020 6 1 ROM PROG 5 28480 08903 80020 1200 0541 1
6. M M c m s s ss X m FO Q umm SERIAL PREFIX 24504 15V 15V U 16B A127 9 19 6k 14 8 1 INPUT JVERLOAD DETECTOR 7 4 9 TO 5 1 VDC nem 15 188 Static Sensit tatic Sensitive i 45 15 148 Devices t15V R75 RBO B 867 4 3 19 6k 6810 1 1G EE a RB1 8250 R87 3 10k INPUT DVLD L re 4 gt C70 12 pur 15V 5 4 TO 4 9 VDC 15v IF TO OUTPUT L 552 Figure 8 105 8 105 Service Model 8903B NOTES 1 When an optional plug in filter assembly is in the left most position Filter 1 it is designated as assembly A2A1 When an optional plug in filter assembly is in the right most pos ition Filter 2 it is then designated as assembly A2A2 Schematic General Information a c tO C e e e e m aa PBB t m o O Cc wri bm 4 r2 e Jeu 08903 60124 08903 60125 Component Locators 2 5 2 Figure 88 106 SERVICE SHEET 2A INFORMATION SEE REVERSE SIDE 8 106 P O A2 INPUT 2 1 OR_A2A2 400Hz HP FILTER ASSEMBLY
7. ol law m q1 T C61 E E C5 QJ a ES RATT m to CL ac a a C T i T t gt tn e 00 a tm m cr e E wi n s METER DC TPE CALIBRATION TP10 TP CALIBRATION A 2 ee waa Ar E Ja 55 5 ERR CR23 CR24 17 EP U20 125 015 C71 R131 2 T1 8 107 C51 C67 C65 C66 U17 C64 cris 81081 cost R129 cA26 C68 neo RAZ 113 R126 867 R120 ms j 964 74 C70 00 COMP Zr P O SEE REVERSE SIDE Component Coordinates Notch Filter Tune and Balance Circuits CESA 554 Service NOTES 1 es Model All the voltages shown are for no input 1 11 SPCL and 3 1 SPCL Chassis ground is made by mechanical panel Schematic General 8B 114 contact of connector to rear Information 8903B Model 8903 All serial prefixes 2717A to 2742A 2728 and below rev 14FEBS89 Service CHANGES On the A4 schematic e U21A In the upper left hand corner locate U21A pin 13 and delete F1 on the 15V supply line locate U21A pin 4 and delete F1 on the 15V supply line C32 In the upper portion of the A4 schematic under LOW PASS FILTERS PASS BAND GAIN 2 add C32 3 3 p in paral
8. gt gt gt gt gt gt P gt gt Pr gt gt gt gt p gt gt gt gt gt gt gt pr gt p gt gt gt m gt o gt gt gt gt Partial Component Coordinates for Figures 8B 114 8B 116 and 8B 118 2730A to 2813A for HP8903B and 2730A to 2814A for the HP8903E AVG QUASI RMS AVG ZERO RMS ZERO SCALE PEAK SCALE TP2 ADJUST ADJUST 11 4 er A 2 2 2 BLACK C53 R93 R149 R85 27 o R207 euo com D PS C eicolto olo ec 1210710 riil in ig ar A cy m e N 5 gt 5 a T ALT S R e 22 r Qc 5 1030000000001 d Y X Partial Component Locator for Figures 8 114 8 116 and 8 1 18 SS5 2730A to 2813A for HP8903B and 2730A to 28144A for the HP8903E rev 14FEB89 8B 114 3 Model 8903B E Service AVG QUASI RAS AVO ZERO RMS ZERO METER oc SCALE SCALE 1 2 ADJUST ADJUST 1 1 TP4 1S TP amp CALIGRATION IPO TP CALIBRATION e e e V4 e D BLACK sf 88 B Bis B D e s p S ag Y BB 5 B Us gj 8 8945 an eO ER B rhon9000000000001 sino 9 Ea ono RIOS Rire 200000000000000 gt gt OD 99 55 wa P 00 00 QN eq Rd 69 oo
9. 0 100 24546 4 1 8 0 1002 A4R127 0699 0239 8 1 RESISTOR 59K 1 1W F 0 15 28480 0699 0239 A4R128 0698 3150 6 RESISTOR 2 37 1 125W TC 0 100 24546 4 1 8 0 2371 A4R129 0698 0085 0 RESISTOR 2 61K 1 125W TC 0 100 24546 4 1 8 0 2611 A4R130 0698 3153 9 RESISTOR 3 83K 1 125W F 0 100 24546 4 1 8 0 3831 4 131 0757 0280 3 RESISTOR 1K 1 125W TC 0 100 24546 4 1 8 0 1001 A4R132 0757 0405 4 2 RESISTOR 162 1 125W TC 0 100 24546 1 8 0 1628 A4R133 0757 0200 RESISTOR 5 62K 1 125W 0 100 24546 C4 1 8 T0 5621 F A4R134 0698 8822 9 RESISTOR 6 81 1 125 TC 0 100 28480 0698 8822 A4R135 0757 0405 4 RESISTOR 162 1 125W TC 0 100 24546 C4 1 8 TO 162R F A4R136 0757 0465 6 RESISTOR 100K 1 125W F TC 0 100 24546 4 1 8 0 1003 A4R137 0757 0279 0 RESISTOR 3 16 1 125W TC 0 100 24546 C4 1 8 T0 3161 F 4 138 0757 0279 0 RESISTOR 3 16K 1 125W F TC 0 100 24546 C4 1 8 TO 316 i F A4R139 0757 1094 9 RESISTOR 1 47 1 125W TC 0 100 24546 4 1 8 0 1471 A4R140 0698 3153 9 RESISTOR 3 83K 1 125W TC 0 100 24546 4 1 8 10 3831 A4R141 0757 0280 3 RESISTOR 1K 1 125W TCz 0 100 24546 4 1 8 0 1001 Refer tn Section 7 for update tufermation Factery Selected Compenent Refer te Section S Errata port change 6 40 rev 16FEB90 8903 08903 60128 SERIAL 2450 2720A HP8903B Referen
10. s u MX s 8 ee a ee Q Q VERRE een mo oe a Te Qm eT Q 0 O wu Q ap CA7 ATTENUATOR 3 F2 2 c39 47 R48 3000 R51 1000 AMPLIFIER 4 GAIN 10 0 05 4 0 05VDC 115V NOTE 1 C35 AMP 4 D 1H 4 15V R52 1000 BHO C37 L C38 Ene ATTENTION Static Sensitive Devices Qm aaa Q Oe eee ee Q wm eee 88 uw eee s QG af OdB OR 2098 0 05 TO 0 05 vDC NOTE 1 U78 A53 620 R54 2610 P O A13 xAAB oe ee o4 4 i 11 l l P O A12 CONNECTOR FILTER ASSEMBLY 08903 60016 _ ME 1 B ue 17 10 I Em LATCH 13 M JL 1 Figure 85 Service Model 89038 Component Coordinates NOTES 1 Asterisk indicates factory selected values 2 These components are not normally loaded Refer to Section 5 under VOLTMETER ADJUSTMENTS 3 All voltages shown are for 1 3 Vrms input at 1 kHz with 1 11 SPCL and 3 1 SPCL 4 f the A4 OUTPUT AMPLIFIER VOLTMETER ASSEMBLY 08903 60128 is to be used in an 8903A AUDIO ANALYZER as an RMS detector pin 1 of the XA4A connector must be grounded Otherwise the 4 assembly will function as an AVG det
11. 0 100 24545 3 1 8 0 3831 A2A_R14 0698 3484 9 3 RESISTOR 6 65K 1 125W F TC 0 100 24546 C4 1 8 T0 6651 F A2A_R15 0698 4430 7 RESISTOR 1 91 1 125W F TC 0 100 24546 C4 1 8 T0 1911 F A2A_R16 0598 7241 4 2 RESISTOR 1 62K 1 05W 0 100 24546 C3 1 8 TO 1621 F 2 101 1826 1290 5 LOW BIAS H IMPD QUAD 14 DIP P 01295 TL7L04C40 Refer to Section 7 for update information Factory Selected Component Refer te Section b Errata part change rev 16FE D90 6 21 Model 8903 Reference Qty Designation Number 1 A2A1 08903 50127 2 1 OR A2A2 08903 60127 2 1 2 1 0180 2661 5 12 2 _ 2 0180 2661 5 C3 0160 5032 8 7 2 _ 4 0160 6322 1 1 2 5 0160 4622 0 2 6 0160 5321 0 1 2 0160 5032 8 A2A C8 0160 5032 8 2 CS 0160 6605 4 2 A2A_C10 0150 6606 4 2 A2A_J1 1251 6063 1 6 2 H1 0698 7195 8 A2A R2 0698 7 195 8 2 R3 0598 8191 5 1 2 R4 0698 7273 2 1 2 R5 0698 7240 3 2 A2A R6 2100 3351 5 A2A R7 0598 7243 6 A2A RB 0757 0273 4 2 2 R9 0699 4471 6 1 2 R10 0757 0273 4 2 _ 11 0698 7234 5 1 A2A_R12 0698 4020 1 2 2 _ 13 0698 7267 4 A2A R14 0757 0454 3 1 A2A U1 1826 1290 8 Refer te Section 7 for update information rev 1GFEB90 HP Part Table 6 3 Replaceable Parts Description C MESSAGE WEIGHTING FILTER OPTION 013 ONLY C MESSAGE WEIGHTING FILTER OPTION 053 ONLY CAPACITOR FXD 1UF 10 50VDC TA CAPACITOR FXD
12. 0 100 24546 RESISTOR 45 2 1 25W 0 25 28430 RESISTOR 4 71 1 125W TC 0 100 28480 RESISTOR 6 19K 1 05W F 0 100 24546 RESISTOR TRMR 500 10 C SIDE ADJ 1 TRN 28480 RESISTOR 29 3K 1 25W 0 25 28480 RESISTOR 101 5K 1 125W F 0 50 19701 RESISTOR 938 1 25W F TC 0 25 28480 RESISTOR 4 28K 1 25W F 1C 0 25 28480 OP AMP LOW NOISE 8 DIP C PKG 52063 AMP LOW NOISE 8 DIF C PKG 92063 Factory Selected Component Refer to Section 5 Replaceable Parts Mfr Part Number 08903 60124 08903 60124 0160 7018 0160 7018 0160 4787 0160 4835 0160 4835 0160 7018 0160 7018 0150 7018 0160 4787 0160 5046 0160 5046 D1IROGS 1A50K D1ROGS 1A50K 1251 6063 C3 1 8 TO 21R5 F 1 8 TO 21R5 F 0699 0403 0698 8586 C3 1 8 T0 6191 F 2100 3351 0699 0404 MF4C1 8 T2 10152 E 0699 0410 0699 0408 XRSSJ4ACN XRS3534ACN A Errat part change 6 17 Mode 8903B Replaceable Parts Table 6 3 Replaceable Parts Reference HP Part C Q D Mfr 3 escription Mfr Part Number Designation Number D Y P Code 2 1 08903 60125 1 WEIGHTING FILTER 28480 08903 60125 OPTION 011 ONLY OR A2A2 08903 60125 0 1 CCITT WEIGHTING FILTER 28480 08903 60125 OPTION 051 ONLY A2A C1 0160 6326 5 2 C MPC 1060P 50V 28480 0160 6326 A2A C2 0160 5201 3 1 CAPACITOR FXD 01UF 1 200VDC 28480 0160 5201 2 C3 0160 6327 6 1 4000 50V 26480 0160 6327 A2A 4 0160 4759 4
13. 2084331 3168331 3168331 3168331 A Errata part change rcv JGFEB90 Model 8903B Replaceable Parts Table 6 3 Replaceable Parts Reference HP Part D Mfr escription U Part Number Designation Number D y P Code 1 22 1810 0402 6 NETWORK RES 16 DIP330 0 OHM X 8 01121 316B331 A1R23 1810 0402 6 NETWORK RES 16 DIP330 0 OHM X B 01121 3168331 1 24 1810 0402 6 NETWORK RES 16 DIP330 0 OHM X 8 01121 3168331 A1R25 1810 0402 6 NETWORK RES 16 DIP330 0 OHM X 8 01121 316B331 1 26 1810 0402 6 NETWORK RES 16 DIP330 0 X 8 01121 316B331 A1R27 1810 0402 6 NETWORK RES 16 DIP330 0 OHM X B 01121 3168331 A1Re8 0757 0280 3 1 RESISTOR 1K 1 125W F TC 0 100 24546 4 1 8 0 1001 24504 2730A A1R29 NOT ASSIGNED 27244 AND ABOVE A1R29 0698 3444 1 RESISTOR 316 1 125W F TC 0 100 24546 0698 3444 151 41541 5060 9436 7 41 PUSHBUTTON SWITCH MOUNT 28480 5060 9436 Ail 1820 1729 3 13 IC LCH TTL LS COM CLEAR 8 BIT 01295 SN74LS259N A1U2 1990 0753 0 10 DISPLAY NUM SEG 10 CHAR 43 H RED 28480 1990 0753 1200 1027 0 10 SOCKET DSPL 14 CONT DIP DIP SLDR 28480 1200 1027 A1 US 19 0753 0 DISPLAY NUM SEG 10 43 H RED 28480 1990 0753 1200 1027 0 SOCKET DSPL 14 CONT DIP SLDR 28480 1200 1027 104 1990 0753 0 DISPLAY NUM SEG 10 43 RED 28480 1990 0753 1200 1027 0 SOCKET DSPL 14 CONT DIP DIP SLOR 28480 1200 1027 105 1990 0753 0 DISPLAY NUM SEG 10 CHAR 43 H REO 28480 1990 0753 1200 1027 0 SOCKET DSPL 1
14. iE RE INTEGAATOR 1 T nS T NO FRQ 15 4 Fi 3 10k A28 NRE 68k i0 TO 10 R101 R102 i Vaer H 160 TP13 15V 2 24 20k 0 FRQ 2 30 R20 U13 571 P O 68k vaer 51 0198 L 2 T D 5 Static Sensitive A ND MODE 1 4 vi 2 Devices 415V 24 0471 oo SUM AMPLIFIER 1 R12 cio 1 0 041 U18B i PS Ge 1 7 NO MODE 0 5 0 15 12 R5 C4 FT a 71 71 718v F gt 31 0 047 D Vi 15V 017 QD AVG RMS DET SWITCH MEL Q31 C11 15V IF 1 2 2 gt ie d ko TIE XA3B 2 QUT 128k 019 JERR sp 2 6 35 mu em s 90 AND OUTPUT AMPLIFIER FROM INPUT s POWER SUPPLIES AND GROUND 5 R16 F1 0 02231 AMPLIFIER 256 019 15viF SS 7 8 Sp 05 R17 R22 4 7p Q20 032 c13 5414k 0 m z ye 10k R18 1 BP P 30 TO 30 mVDC C44 QUT OUT 0 3 355 TP5 2 1000 R33 P O 0 OUTPUT 1000 XA3B AMPLIFIER A3 Qui COD 5 s 0 04 18vip 73 222 C18 4 7p 15 53 3 Figure 88 111 TUNE BAL TP4 TP2 TP4 o MP1 BLACK Q 43 c 1 CJE E s 63 230 E 92 67 ROS u gt R47 gg c y TPS TPS 00000000000000 Figure 88 112 SERVICE SHEET 4 INFOR
15. D Qty Description Code Mfr Part Number A3Q12 1855 0420 2 TRANSISTOR 234391 N CHAN D MODE 28480 1855 0420 A3Q13 1855 0420 2 TRANSISTOR J FET N24391 N CHAN D MODE 28480 1855 0420 A3Q14 1855 0420 2 TRANSISTOR J FET 2 4391 N CHAN D MODE 28480 1855 0420 A3Q15 1855 0420 2 TRANSISTOR J FET 2N4391 N CHAN D MODE 28480 1855 0420 A3Q16 1855 0420 e TRANSISTOR J FET 2N4391 N CHAN D MODE 28480 1855 0420 A3Q17 1855 0420 2 TRANSISTOR J FET 244391 N CHAN D MODE 28480 1855 0420 A3Q18 1855 0420 2 TRANSISTOR J FET 244391 N CHAN D MODE 28480 1855 0420 19 1855 0420 2 TRANSISTOR J FET 244391 D MODE 28480 1855 0420 A3Q20 1855 0420 2 TRANSISTOR J FET 244391 D MODE 28480 1855 0420 21 1855 0420 2 TRANSISTOR J FET 2N4391 N CHAN D MODE 28480 1855 0420 A3Q22 1855 0420 2 TRANSISTOR J FET 2N4391 N CHAN D MODE 28480 1855 0420 A3023 1855 0420 2 TRANSISTOR J FET 2N4391 D MODE 28480 1855 0420 024 1855 0420 2 TRANSISTOR J FET 2 4391 D MODE 28480 1855 0420 A3025 1855 0420 2 TRANSISTOR J FET 244391 D MODE 28480 1855 0420 A3Q27 1855 0420 2 TRANSISTOR J FET 2N4391 N CHAN D MODE 28480 1855 0420 A3028 1855 0420 2 TRANSISTOR J FET 234391 N CHAN D MODE 28480 1855 0420 A3Q29 1855 0420 2 TRANSISTOR J FET 244391 N CHAN D MODE 28480 1855 0420 A3Q30 1855 0420 2 TRANSISTOR J FET 2 4391 N CHAN D MODE 28480 1855 0420 A3Q31 1855 0420 2 TRANSISTOR J FET 2N4391 N CHAN D MODE 28480 1855 0420 A3Q32 1855 0420 2 TRANSI
16. Errata part chauge rev 1GFEB90 6 69 Replaceable Parts Reference Designation 8 A8DS1 A8DS2 A8DS3 A8DS4 ABJ1 ASMP 1 2 ABQ1 ABR1 2 8 4 ABRS A8F6 7 ABRB A8RS ABR10 1 1 A8R12 A8R13 1 2 4 5 6 A8TP7 A8TP8 A8TP9 10 11 12 A8TP13 A8TP14 A8TP15 A8TP16 17 ABTP18 A8U1 02 ABUS ABUA ABUS A8UG 807 Number 08903 60134 SERIAL 2450 TO 2614A 1990 0524 1990 0524 1990 0524 1990 0524 1200 0507 4040 0748 1480 0116 4040 0747 1480 0116 08903 00060 1854 0810 0757 0401 0698 3440 1810 0055 0757 0442 0757 04417 0757 0442 1810 0353 075 0442 0757 0442 0757 0442 0757 0442 075 0445 0757 0453 1251 0590 1251 OCOO 1251 0600 1251 2600 1251 0600 1251 0600 1251 0500 1251 0500 1251 0600 1251 0600 1251 0600 1251 0600 1251 0600 231 0600 1251 0600 1251 0600 1251 0600 1251 0500 1820 1193 1820 1193 1820 1201 1820 1197 1820 1920 1200 C554 1820 2007 1200 0651 1820 1417 1200 0638 C D WW G q n Q e gt O O O O Io ft 2 6 D O N Qty Refer te Section 7 for update mfermation 6 70 Table 6 3 Replaceable Parts Description Mfr P Code LED LAMP LUM INT 1MCD
17. PKG 04713 LOW NOISE 8 DIP C 52063 LOW NOISE 8 DIP C 52063 LOW BIAS H IMPD TO 99 34371 ASSIGNED LOW NOISE 8 DIP C 52063 ANALOG SWITCH 4 SPST 16 28480 ANALOG SWITCH 4 SPST 16 PIN 28480 IC OP AMP LOW NOISE 8 DIP C PKG 52063 NOT ASSIGNED GATE TTL LS TPL 01295 IC DRVR TTL F LINE DRVR OCTL 28480 IC COMPARATOR GP QUAD 14 DIP C PKG 04713 IC OP AMP PRCN 8 DIP C PKG 06665 IC COMPARATOR GP QUAD 14 DIP C PKG 04713 NOT ASSIGNED AMP LOW BIAS H IMPD 99 PKG 34371 DIODE ZNR 12V 5 PD 1W IR 5UA 28480 DIODE ZNR 12V 5 PO 1W IRz SUA 28480 RESISTOR ZERO OHMS 22 AWG LEAD DIA 28480 NOT ASSIGNED JUMPER WIRE 28480 JUMPER WIRE 28480 CONNECTOR 10 PIN M POST TYPE 28480 CONNECTOR 10 POST TYPE 28480 Factory Selected Compouent Refer te Section 5 Replaceable Parts Mfr Part Number 1251 0600 1251 0500 XRSS34ACN LM339J XRSS34ACN XR5534ACN HA2 2605 5 XR5534ACN 1826 1012 1826 1012 XR5534ACN SN74LS10N 1820 2795 LM334 OP 27 Z LM339J HA2 2605 5 1902 0028 1902 0029 8159 0005 08903 60293 08903 60298 1251 5065 1251 5055 A Errata part change 6 15 Model 8903 Reference Designation A2A1 OPTION 010 A2A1 OR A2A2 OPTION 050 A2A2 2 C1 2 2 A2A 2 2 5 A2A_C6 A2A_C7 A2A CB A2A C9 A2A C10 2 C11 A2A
18. Since Q7 8 9 and 10 are double FET packages they will operate correctly in the circuit if inserted with the tab either pointing up or down 2717 to 2742A On the A13 schematic e 08903 60192 Change the part number of the A13 POWER SUPPLY AND MOTHERBOARD ASSEMBLY to 08903 60192 2813A and above On the A13 schematic e 08903 60292 Change the part number of the A13 POWER SUPPLY AND MOTHERBOARD ASSEMBLY to 08903 60292 SS1 rev I4FEB89 8B 103 1 J i 2 INPUT 8159 3207 MAX 001 0 49 WA ra bil el HIGH 1 OPTION 300 001 390 NLY P 0 MC NR OPTION 3007 MA 004 ONLY Js PZO OPTION 001 LOW l 300 MAX FLOAT Os3 16 NC We EXCEPT OPTION 001 P O W4 OPTION 001 ONLY P O A13 POWER SUPPLY AND MOTHERBOARD ASSEMBLY 08903 60129 P O Ja L2 XA2B TE 2 NOTE 2 T Ta 3 1 N i i 13 NOTE 2 14 C15 1 3 FROM LATCH 13 aaj 3 19 4 18 6 14 FROM LATCH 12 G3 i i 18 lt 11 26 2 5 IN AC OC SWITCH 1 5H 1000 amp 1 IN AC POWER SUPPLY U14 15 qo C14 A3 PUT
19. 0 100 RESISTOR 1 749K 1 25W F TC 0 25 RESISTOR 21 5 1 05 TC 0 100 RESISTOR 21 5 1 05W F 0 100 Mfr Code 28480 28480 28480 28480 28480 04713 28480 04713 04713 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 24546 24546 24546 19701 24546 28480 24546 24545 24546 24546 28480 28480 28480 24546 24546 28480 24546 24546 Factory Selected Component Refer te Sertion Model 8903B Mfr Part Number 4040 0748 1480 0116 4040 0750 1480 0116 0380 1773 2N5268 1853 0459 2N5268 2N5268 1853 0459 1855 0418 1855 0642 1855 0642 0757 0159 0699 0413 0599 0525 0698 8825 0699 0402 0699 0405 0698 6348 4 1 8 0 2613 4 1 8 0 348 3 4 1 8 0 1003 4 1 8 0 6101 4 1 8 10 1003 0757 0833 4 8 0 2371 1 8 70 2371 C3 1 8 TO 21R5 F C3 1 8 TO 24R5 F 0698 5147 0699 0412 0699 0412 C3 1 8 TO 21R5 F C3 1 8 TO 21R5 F 0699 0407 C3 1 8 TO 21R5 F C3 1 8 TO 21R5 F A Errata part change rev 10 EB90 Model 8903 Replaceable Parts Table 6 3 Replaceable Parts rev 16FEB90 Reference HP Part D Mfr Qty escription Mfr Part Number Designation Number D P Code A2F36 0699 0409 4 2 RESISTOR 1 3224K 1 25W F 0 25 28480 0699 0409 A2F37 0699 0409 4 RESISTOR 1 3224K 1 25W 0 25 28480 0699 0409 A2R38 0757 0280 3 43 RESISTOR 1K 1 125W TC 0
20. 02111 43P503 A4R150 0698 3459 B RESISTOR 383K 1 125W F TC 0 100 28480 0698 3459 A4R151 0757 0438 3 RESISTOR 5 11K 1 125W F TCz0 4 100 24546 C4 1 8 TO 5111 F A4R152 0757 0280 3 RESISTOR 1K 1 125W F 0 100 24546 4 1 8 0 1001 A4R153 0698 7253 8 RESISTOR S 11K 1 O5W TC 0 4 100 24546 C3 1 8 0 5111 A4R154 0698 7196 8 RESISTOR 21 5 1 05W TC 0 100 24546 C3 1 8 TO 21R5 F A4R155 0698 7196 8 RESISTOR 21 5 1 05W F 0 100 24546 C3 1 8 TO 21R5 F 4 156 0698 7236 7 RESISTOR 1K 1 05W F 0 100 24546 C3 1 8 TO 100 1 F A4R157 NOT ASSIGNED A4R157 0698 6360 6 RESISTOR 10K 1 125W F 0 25 28480 0698 6360 A4R158 0698 6630 3 RESISTOR 20K 1 125W F TC 204 25 28480 0698 6630 Refer te Section 7 for update information Pactery Selected Component Refer 9 Section Errata part change 6 48 rev IGFEB90 Model 8903B Reference HP Part Qty Designation Number D y A4R159 H199 A4R200 0698 6631 4 A4R201 0698 6631 4 A4R202 0698 6343 5 A4R203 0698 8607 8 A4R204 0698 7248 1 A4R205 0699 0069 2 A4R206 0698 6360 6 A4R207 2100 3274 e A4R208 0757 0470 3 4 209 0698 8615 8 AAR210 0698 4543 3 A4Re11 0698 3243 8 AART 1 0837 0239 2 1 A4TP1 1251 0600 4 2 1251 0600 0 4 1251 0600 0 A4TP4 1251 0600 0 A4TPS 1251 0600 0 A4TP6 1251 0500 0 A4TP7 1251 0600 0 A4TP8 1251 0600 0 A4TP9 1251 0600 0 A4TP 10 1251 0600 0 ASTP 1 1251 0600 0 401 1826 0574 6 3 A4U2 1826 0574 6
21. 24 CONT DIP DiP SLOR 28480 1200 0541 25374 TO 26114 AJUE 1818 3749 6 1 ROM PROG 9 28480 1818 3749 1200 0541 1 SOCKET IC 24 CONT DIP DIP SLDR 28480 1200 0541 A8U27 1818 3748 5 1 8 28480 1818 3748 1200 054 3 1 SOCKET IC 24 CONT DIP SLOR 28480 1200 0541 ASU2R 1818 3745 2 1 ROM PROG 5 28480 1818 3745 1200 0541 1 SOCKET IC 24 CONT DIF SLOR 28480 1200 054 1 Refer to Section 7 for update information Factory Selected Component Refer t 7 Errata part change 6 71 Replaceable Parts Table 6 3 Replaceable Parts Reference Descriptio Designation Number D eriptlen A8 08903 60134 SERIAL 2450A TO 2614A ABU29 1820 1112 8 FF TTL LS D TYPE POS EDGE TRIG ABUSO 1818 0197 2 1 IC NMOS 1024 1K STAT 400 NS 3 5 1200 0539 7 1 SOCKET IC 18 DIP DIP SLDR 1 0410 0757 5 1 CRYSTAL QUARTZ 2 000 MHZ HC 6 U HLDR 1200 0770 8 SOCKET XTAL 2 CONT HC 6 U DIP SLOR Refer to Section 6 72 4 fer inferiiatien Mfr Code 01295 34335 28480 28480 28480 r Facetory Selected Component Refer te Sectioun 5 Mode 8903B Mfr Part Number SN74LS74AN AM91L118DC 1200 0539 0410 0757 1200 0770 Errata part change rev I6FEB90 Model 8903 Replaceable Parts Table 6 3 Replaceable Parts Reference HP Part D Mfr escription Mfr Part Number Designation Number D ty P Code A8 08903 60184 7 1 CONTROLLER COUNTE
22. maximum Ni anasu megohm MEG meg 109 used in parts list MET FLM metal film MET OX metallic oxide MF medium frequency microfarad used in parts list manufacturer mg milligram MHZ s uya oe megahertz mi a millihenry mho mho minute time evsc Minute plane angle MINAT miniature mm osi yx millimeter 652 Replaceable Parts MOD 233945 modulator MOM momentary MOS metal oxide semiconductor Ins oov EL millisecond MIG mounting MTR meter indicating device IV 22222252989 chews millivolt mVac millivolt ac mVdc millivolt dc mVpk millivolt mVp p millivoit peak to peak mVrms millivolt rms mW milliwatt MUX multiplex MY waqay sqa saa ies mylar EN microampere BP ben ai ces microfarad AH a EEG ER microhenry micromho BS p c microsecond Ur microvolt uMaC microvolt ac BVOC microvolt dc pBVpk microvolt peak uVp p microvolt peak to peak uVrms microvolt rms N AE microwatt DA ir vr nanoampere 444339 9 xs no connection N C i i normally closed NE uve s ua neon NEG orb AG negative esu tiU nanofarad NI PL nickel plate norma
23. 0515 1329 e 0515 0374 4 0515 0355 3 2305A TO 2720A MP30 08903 00017 3 27204 AND ABOVE MPa MP31 08903 00043 5 0515 1950 4 0515 0355 3 0215 0374 4 MP31 08903 00018 4 0515 1950 4 0515 0365 3 0515 0374 4 MP32 7121 8954 1 MP33 MP34 7120 4295 6 24504 ONLY MP35 7120 59 1 5 25204 AND ABOVE 35 MP36 MP37 7120 8138 4 MP38 MP39 MP40 0590 1251 6 MP41 2190 0068 5 42 2190 0102 8 MP43 2950 0035 8 44 1250 2164 3 Refer te Seetion 7 for update formation rev 1GFEB9IO Table 6 3 Replaceable Parts Description Mfr P Code NOT ASSIGNED LABEL HOLDER 28480 LABELS SHEET OF 51 FILTER 28480 INCLUDES 400Hz HIGH PASS FILTER C MESSAGE WEIGHTING FILTER CCIFVARM WEIGHTING FILTER A WEIGHTING FILTER CARD CAGE 28480 SCREW MACH M3 X 0 5 BMM LG PNTX 00000 ATTACHES CARD CAGE MOTHERBOARD AND TO CORNER STRUTS WASHER LK HL CU 3 0 MM 3 1 MM ID 28480 CLAMP MULTIPLE TYPE 28480 CLAMP FL CA 1 wD 06915 SCREW MACH M3 X 0 5 8 MM LG PAN HD 00000 ATTACHES CLAMP CARD CAGE WASHER LK HLCL 3 0 MM 3 1 MM ID 28480 NOT ASSIGNED SUPPORT LEFT 28480 SCREW MACH M3 X 0 5 8MM LG PNTX 00000 ATTACHES SUPPORT TO CORNER STRUT AND MOTHERBOARD HEAT SINK PANEL 28480 SCREW MACH ASSY M2 X 04 4MM LG 00000 SCREW MACH ASSY M3 X 0 5 10MM LO 00000 HEAT SINK COVER 28480 SCREW MACH M3 X 0 5 8MM LG PAN HD 00004 SCREW MACH ASSY M3 X 0 5 tOMM LG 00000 SCREW MACH ASSY M2 X 0 4 4MM LG 00000 POWER SHIELO 28480 NOT ASSIGNED LABE
24. 3 X Figure 88 110 SERVICE SHEET 3 INFORMATION Service Mode 89038 Component Coordinates NOTES C2 A3R2 R3 A3Q11 35 orn LEW uo 4 2 7 fe GND A B C D E F MH PLASTIC TO 18 CASE OR METAL CAN P O 2 1 AND OR SS 2B SEE REVERSE 5106 Ce TUNE BAL OFST 0 5 TP4 TP 1215 TPB TPQ 10 TPAR 4 Z MP ORANGE Q wA 915 093 e m 827 x e Y 97 ero y us ae e r r Sus CA Shali C11 ys 035 C4 Y 1821 29 a 832 53 hn C48 512 Ui Uig 115 115 lt C3 C C 757 CNN 8102 00000000000000 a Schematic General Information Component Locator 8B 110 Model 8903 On the A13 schematic All serial prefixes e C53 Under PRE NOTCH RMS DETECTOR locate C53 and change it to C56 18 uF non polarized e C25 Under INTEGRATOR 2 change the value of C25 to 18 uF 2717A to 2742A On the A13 schematic e 08903 60192 Change the part number of the A13 POWER SUPPLY AND MOTHERBOARD ASSEMBLY to 08903 60192 2813A and above On the A13 schematic e 08903 60292 Change the part number of the A13 POWER SUPPLY AND MOTHERBOARD ASSEMBLY to 08903 60292 SS3 rev 14FEB89 8B 110 1 AND
25. A amp A DN Pp Pp N h RR Qty 27 Refer ta Section 7 for update information 6 30 Table 6 3 Replaceable Parts Description CAPACITOR FXD 47UF 5 50VDC MET POLYC CAPACITOR FXD 2UF 4 59 50VDC MET POLYC CAPACITOR FXD 22UF 5 100VOC CAPACITOR FXD 01UF 10 100VDC CER CAPACITOR FXD 01UF 10 100VDC CER NOT ASSIGNED CAPACITOR FXD 01UF 10 CER CAPACITOR FXD 01UF 10 100VDC CER CAPACITOR FXD 1UF 10 50 0 CER CAPACITOR FXD 1UF 10 CER CAPACITOR FXD 1 8UF 20 50OVDC CAPACITOR FXD 010 10 100VDC CER CAPACITOR FXD 010 10 100VDC CER CAPACITOR FXD 82UF 5 1t00VDC DIODE GEN 180V 200MA DO 7 DIODE GEN PRP 180V 200MA DO 7 DIODE SWITCHING 80V 200MA 2NS DO 35 DIODE SWITCHING BOV 200MA 2NS 00 35 DIODE SWITCHING 80V 200MA 2NS DO 35 DIODE SWITCHING 80V 200MA 2NS DO 35 DIODE SWITCHING 80V 200MA 2NS DO 35 DIODE SWITCHING 80V 200MA 2NS DO 35 NOT ASSIGNED NOT ASSIGNED DIODE SWITCHING 80V 200MA 2NS DO 35 SWITCHING 80V 200 2NS DO 35 DIODE SWITCHING 80V 200MA 2NS DO 35 DIODE SWITCHING 80V 200MA 2NS DO 35 DIODE SM SIG SCHOTTKY DIODE SM SIG SCHOTTKY INDUCTOR RF CH MLD 10UH 10 166DX 385LG INDUCTOR RF CH MLD 220UH 10 EXTR PC BLK POLYC 062 BD THKNS PIN GRV 062 IN DIA 25 IN LG STL EXTR PC BD ORN POLYC 062 8D THKNS PIN GRV 062 IN DIA 25 IN LG STL PLUG HOLE BDR HD FOR 187 D HOLE NYL TRANSISTOR J FET 2N4393 N CHAN D MODE TRANSIS
26. Hint Pin 10 of 023 should be a TTL high U23B U23D U24B and U24D should be U23A U23C 24 and U24C should be on 5 Reconnect the voltmeter to A4TP4 Set the voltmeter to measure On the Audio Analyzer reduce the SOURCE amplitude for a reading between 299 and 301 mVrms on the voltmeter 6 Reconnect the voltmeter to A4TP1 Set the voltmeter to measure dc The level on the voltmeter should be between 294 and 306 mVdc Hint If the signal is only slightly out of limits perform the Voltmeter Adjustment paragraph 5 13 if within limits the detector is functioning properly under the current test conditions 7 Key in 5 0 SPCL to switch the detector to rms The level on the voltmeter should be between 294 and 306 mVdc 8 Reconnect the voltmeter to A4TP4 Set the voltmeter to measure ac On the Audio Analyzer increase the SOURCE amplitude for a reading between 2 99 and 3 01 Vrms on the voltmeter 9 Key in 5 7 SPCL to switch the detector to quasi peak Hint Pin 3 of U29 should be a TTL low U25A U25B and U25C should be on U25D should be off and U23 and U24 should be in the same state as for the average detector See hint for step 4 10 Reconnect the voltmeter to A4TP1 Set the voltmeter to measure dc The level on the voltmeter should be between 2 94 and 3 06 Vdc Hint See the hint for step 6 11 Disconnect the voltmeter Connect a high impedance dc coupled oscilloscope to A4TP1 Use the oscilloscope s vert
27. NO KEY PRESSED S99 EE B mum 6 2 Es 162 E Figure 8 6 Key Codes for Key Scan Service Special Function 60 0 use the Key Scan Special Function remove the instrument top cover Key in 60 0 SPCL then jumper A8U6 pin 7 to ASTP3 GND on the A8 Controller Counter Assembly Press the front panel keys and observe the right display If two or more keys are pressed simultaneously the display shows the first one found in its normal scan See Service Sheet 17 Two simple programs for displaying the key codes on a computing controller are shown in Table 8 3 Removal of the top cover is unnecessary The Audio Analyzer is assumed to have HP IB address 28 3 M E n TF rev 20J UN87 8 13 Model 8903B Service rev 20J UN87 Table 8 4 PIO Port A A9U18Pin 2 37 36 31 30 25 24 19 Display Digit 1 2 3 4 5 6 7 8 Mnemonic 108 IO7 106 105 04 103 102 1 True Table 8 5 Port B A9U18 Pin 1 38 35 32 29 26 23 20 Display Digit 1 2 3 4 5 6 7 8 Mnemonic ARD SRQ ATT ATL SDV c 1 True 1 Model 8903 8 24 ERROR MESSAGES 8 25 General The instrument generates error messages to indicate operating problems incorrect keyboard entries or service related problems T he error messag
28. Replaceable Parts Reference HP Part C Qty Designation Number D 5 111 0757 0279 0 12 0698 3435 0 ASR113 0698 3435 ASR 14 0757 0280 3 A5R115 0698 3150 6 5 16 0757 0459 8 1 5 117 0757 0465 6 A5R118 0698 7262 9 A5R119 0757 0280 3 A5R120 0757 0440 7 A5R121 0698 7241 4 A5R122 0698 3430 5 A5R123 0757 0280 3 5 124 0698 0084 9 ASRI25 0698 0084 9 ASR126 0698 3430 5 A5R127 0698 3153 9 5 128 0698 3153 9 A5R129 0757 0442 9 A5R130 0757 0442 9 A5R131 0698 3430 5 ASR132 0698 3430 5 ASTP1 1251 0600 0 5 2 1251 0600 0 1251 0600 0 5 1251 0600 0 5 5 1251 0600 0 5 1251 0600 0 ASTP 1251 0600 0 1251 0600 0 5 1251 0600 0 5 10 1251 0600 o A5TP11 1251 0600 A5U1 1820 1144 6 1 A5U2 1826 0026 3 1 A5U3 A5U4 1626 0652 3 ABUS 1826 0783 9 ASUS 08903 80041 4 1 507 1820 1423 4 1 ASUB 1826 0138 8 A5U9 1826 0371 1 3 ASU10 1826 0785 1 5011 1826 0662 3 A5U12 1826 0716 8 4 5013 1826 0371 1 5014 1826 1492 9 2 A5U15 1826 1492 9 tRefer to Section 7 for update information 6 56 Tuble 6 8 Replaceable Parts Mfr Description Code RESISTOR 3 16K 1 125W F TC 0 100 24546 RESISTOR 38 3 1 125W F TC x0 4 100 24546 RESISTOR 38 3 1 125W 0 100 24546 RESISTOR 1K 1 125W F 0 100 24546 RESISTOR 2 37 1 125W F TCz 0 100 24546 RESISTOR 56 2K 1 125W 0 100 24546 RESISTOR 100K 1 125W 0 100 24546 RE
29. m 2 ai iu m jj QU rt lt le ac B m 53 css pes chem C15 R18 C17 21 R111 107 C67 C amp S C66 C51 C70 C12 GETE Cia U21 U11 CB1 B2 U17 C11 C 45 tu r aui cr Riog 024 4 Figure 88 118 SERVICE SHEET 7 INFORMATION Component Locator Schematic General Information P 1 Output Amplifier 0 A4 Voltmeter Detector SS6 and Meter Circuits SEE REYERSE SIDE 88 118 ng ip ee SS SN Model 8908 Service CHANGES serial prefixes On the Component Locator e U1 U2 U6 U8 U12 U13 U1 U2 U6 U8 U12 and U13 are round cans and the tabs should be in the 2 00 o clock position R211 On page 8B 118 3 in the lower right hand corner of the component locator add R211 between R209 and R210 On the Component Coordinates R211 Add R211 A 3 to the partial component coordinate table on page 8B 114 3 2717A to 2742A 08903 60192 Change the part number of the A13 POWER SUPPLY AND MOTHERBOARD ASSEMBLY from 08903 60129 to 08903 60192 2728A and below e SS7 The 08903 60128 board is obsolete to replace this board you must order the 08903 60282 not Quasi Peak e Note The 08903 60282 not Quasi Peak and the 08903 60283 Quasi Peak are identical boards except for the positioning of W1 See pa
30. 1 5 864 R74 C45 C7 C76 8108 Ue3 RBB R152 4 SEE REVERSE SIDE Output Amplifier A12 Voltmeter Output Amplifier Figure 88 116 SERVICE SHEET 6 INFORMATION Component Locator 88 116 P O A13 POWER SUPPLY AND MOTHERBOARD ASSEMBLY 08903 68129 0 12 10 1 13 0 6 P O XA4B 2 GO 24 am 0 4 OUTPUT AMPLIFIER VOLTMETER ASSEMBLY 08903 60183 a pue mm Qum mw r ee G s s G w G mme or eee eee m wr s m eee ee Sa ae ECL mA ERR e Sak FILTER AMPLIFIE i c i pr U23C 0298 TP1 19 4 BUFFER DC Q1B n 9 15 C84 6 ell 5 3 9 iu 51 gt U25D aa 154 d U3 m R94 R99 C46 mat LU 2 15 0258 R144 NOTE 2 4 F4 7 15 R77 F R92 R993 L1 7 15V 15V lt d R154 C73 21 5 0 01 15 R148 x1 20k 1 R9 R9 CMOS n 37 68k 5 075 R156 3 3p T I OVERLOAD DETECTOR 5 gt 15 401 VOC 18k 1O Cc 5V 5 52 15 R153 15V 150 R149 38 S K 15V Yo AVG ZERO ADJ 5 11 B AVG RMS DET SWITCH T NOTE 4 LE QUASI
31. 1901 0376 1901 0376 1901 0376 1901 0376 1901 0376 1901 0050 1901 0050 1901 0050 1901 0050 1901 0050 1901 0880 1901 0880 1901 0880 1901 0880 1901 0880 1901 0880 1901 0880 1901 0880 1901 0880 1901 0880 A Errata part change 16 90 Model 8903B Reference Designation ASCR16 ASMP1 5 2 ASMP3 ASQ1 ASQ2 A5Q3 504 505 ASQ 508 5010 5011 5012 5013 5014 5015 5016 5017 5018 5019 ASQ20 5021 A5Q23 5024 5025 5026 5027 A5Q28 5029 ASQ30 A5Q31 A5Q32 A5Q33 A5Q34 ASRI 5 2 5 5 4 ASRS ASRS ASR7 5 8 ASRS A5R10 HP Part Number 1901 0050 4040 0748 1480 0116 4040 0753 1480 0116 0403 0026 1853 0281 1854 0477 1855 0420 1855 0420 1855 0420 1855 0420 1855 0420 1855 0420 1855 0420 1855 0420 1855 0420 1855 0420 1855 0420 1855 0420 1855 0420 1855 0420 1855 0420 1855 0420 1855 0420 1655 0420 1855 0420 1855 0420 1855 0420 1855 0420 1855 0420 1855 0420 1855 0420 1855 0420 1855 0420 1855 0420 1855 0420 1854 0477 1853 0281 1855 0420 0698 3430 0698 3430 1810 0206 1810 0205 0698 3430 0698 3430 0696 3430 0698 3430 0757 0280 0698 8204 N NY fO Ph fo fo N fO N N MN N FO om 0 ON CQ ung Refer to Section 7 for update information rev 16FE
32. 25 100VDC CER 28480 CAPACITOR FXD 010 10 100VDC CER 28480 CAPACITOR FXD 01UF 10 1 CER 28480 CAPACITOR FXD 3 3PF 25 100VDC CER 28480 CAPACITOR FXD 1UF 10 CER 28480 CAPACITOR FXD 12PF 5 100VDC CER 0 30 28490 CAPACITOR FXD 18UF 1 200VDC 28480 CAPACITOR FXD 1 25UF 2 50VDC 28480 DIODE SWITCHING 80V 200MA 2NS DO 35 28480 DIODE SWITCHING 80V 200MA 2NS DO 35 28480 DIODE SWITCHING 30V SOMA 24 00 35 28480 DIODE SWITCHING 80V 200 2NS DO 35 28480 DIODE SWITCHING 80V 200 2NS DO 35 28480 DIODE GEN PRP 125MA DO 35 28480 DIODE SWITCHING 80V 200MA 2NS DO 35 28480 DIODE SWITCHING 80V 200MA 2NS 00 35 28480 DIODE SWITCHING 80V 200MA 2NS DO 35 28480 DIODE SM SIG SCHOTTKY 28480 DIODE SM SIG SCHOTTKY 28480 DIODE SWITCHING 30V SOMA 2NS DO 35 28480 DIODE SWITCHING 80V 200MA 2NS DO 35 28480 DIODE SWITCHING 30V 2NS DO 35 28480 DIODE SWITCHING 30V 50MA 2NS DO 35 28480 Factory Sclected Component Refer ta Section 5 Model 8903B Mfr Part Number 08903 60283 SERIAL PREFIX 2816 AND ABOVE HP8903B 0160 4814 0160 4810 0160 4835 0160 4835 150D105X9035A2 0160 4835 0160 4805 0160 4835 0160 4835 0150 4799 1500156X902082 0160 4814 0160 3324 0160 4835 0160 4835 0160 4553 0160 4835 0150 4814 0160 4553 0160 4553 0150 4653 0160 4653 0160 4653 0160 4843 1500226 9015 2 150D226X901582 150D226X9015B2 150D606X9006B2 0160 4807 0160 4397 1500105 9035 2
33. 4 1 B 0 301 1 F 4 1 8 0 7151 4 1 8 0 3011 C3 1 8 TO B25R F 4 1 8 0 8531 3 1 8 0 1962 4 1 8 0 3322 TL7LO4C40 A Errata part change 6 23 Model 8903B Reference Designation A2A1 OPTION 014 A2A1 OR A2A2 OPTION 054 A2A2 A2A_C1 2 2 2 C3 2 4 2 5 2 2 7 A2A C8 2 J1 2 R1 A2A R2 2 R3 2 R4 A2A R5 A2A R6 A2A R7 A2A A2A R9 2 R10 A2A R11 A2A R12 2 R13 2 _ 14 A2A R15 A2A R16 2 U1 tRefer to Section 7 for update information rev 16FEB90 HP Part Number 08903 60162 08503 60162 0180 2661 0180 2661 0160 6323 0150 4759 0150 6324 0150 4 50 0180 6325 0160 6506 1251 6063 0698 7105 0698 7 195 0698 5455 0698 7257 0638 7282 0698 7228 2100 3350 0698 7239 0698 7257 0698 3259 0698 7249 0598 7257 0698 7252 0698 3484 0598 4430 0598 7252 1626 1290 c P9 Gan oun wN 91 Qty Table 6 3 Replaceable Parts Description Mfr Code CCIR ARM WEIGHTING FILTER 28480 014 ONLY CCIR ARM WEIGHTING FICTER 28480 OPTION 054 ONLY CAPACITOR FXD 10 10 50VDC 25088 CAPACITOR FXD 1UF 10 50VDC TA 250880 C 2000P 50V 28480 CAPACITOR FXD 6800PF 1 200VDC 28480 C MPC 560P 50V 28480 CAPACITOR FXD 6800PF 17 200VUC 28480 2400P SOV 28480 C
34. 403 1826 1491 8 3 A4U4 1826 1097 0 4 A4US 1826 1491 8 3 416 1826 0109 3 A4U7 1826 0605 5 1 406 1826 0109 3 A4US 1826 0606 5 1 4010 1826 0753 3 4011 1820 1197 9 4 4112 1826 0574 6 A4U13 1826 0109 3 A4U14 1826 0785 1 A4U15 1826 1491 8 3 A4U16 1826 1097 0 4 A4U17 1826 0753 3 4018 1826 0609 8 A4U19 1826 0138 8 10 A4U20 1826 1097 0 4 Refer to Section 7 for rev 1G6FEB90 Table 6 3 Replaceable Parts Description NOT ASSIGNED RESISTOR 2 5K 1 125W 0 25 RESISTOR 2 5K 1 125W 0 25 RESISTOR 9K 1 125W 0 25 RESISTOR 4 5K 1 125W 0 25 RESISTOR 3 16K 1 OSW F TC 0 100 RESISTOR 2 15M 1 125W F 0 100 RESISTOR 10K 1 125W 0 25 RESISTOR TRMR 10K C SIDE ADJ 1 TRN RESISTOR 162K 1 125W TC 204 100 RESISTOR 75K 1 05W F 0 100 RESISTOR 487K 1 125W 0 100 RESISTOR 178K 1 125W F 0 100 THERMISTOR TUB WITH AXL LEADS 1K OHM CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SO CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ CONNECTOR SGL CONT PIN 1 14 MM BSC S2 SQ CONNECTOR SGL CONT PIN 1 14 5 52 SQ CONNECTOR SGL CONT PIN 1 14 MM BSC S2 SQ CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ IC OP AMP LOW DRIFT TO 9
35. A Errata part change 6 53 Replaceable Parts Reference Designation 5 11 ASR12 ASR13 ASR14 ASR15 ASR16 AS5R17 A5R18 ASR19 ASR2O0 5 21 ASR22 5 23 5 24 AS5R25 ASR26 5 27 ASR28 A5R29 A5R30 ASR31 A5F32 ASR33 A5R34 AS5R35 ASR36 ASR37 A5R38 A5R39 5 ASPA1 A5FR42 A5R43 ASR44 5 45 A5F46 A5R47 ASRA4B ASR49 A5F50 ASRS1 5 52 5553 554 ASRS5 5856 5 57 5 58 5 59 5 6 Part Number 0698 8205 0698 8047 0698 8049 0698 8053 0698 8050 0699 0676 0699 0730 0757 0417 0757 0447 1810 0206 0757 0290 0757 0394 0757 0442 0757 0442 0698 3430 0698 3430 0757 0280 0698 8204 0698 8205 0698 8047 0698 8049 0698 8053 0698 8050 0699 0576 0699 0730 0698 3430 0698 3430 0757 0394 0698 3430 0698 3430 0757 0280 0698 8049 0698 8047 0698 8205 0698 8204 0698 3430 0698 3450 0698 3157 0698 3157 0699 0730 0698 3430 0698 8050 0698 8053 0757 0279 0757 1094 0698 0083 0757 0288 0698 3160 0757 0280 0698 3136 Q Q N O N Wu Oo u NUON 2 Qo MAD m N O Qty Refer ta Section 7 for update information 6 54 Table 6 3 Replaceable Parts Mfr Description Code RESISTOR 15 98K 1 125W F 0 25 19701 RESISTOR 32K 1 125W TC 0 25 19701 RESISTOR 64K 1 125W F TC 0 25 19701 RESISTOR 128K 1 125W F TC
36. A4R129 0698 0085 0 RESISTOR 2 61K 1 125W 0 100 24546 4 1 8 0 2611 A4R130 0698 3153 9 RESISTOR 3 83K 1 125W F 0 100 24546 C4 1 8 TO 3831 F A4R131 0757 0280 3 RESISTOR 1K 1 125W TC 0 100 24546 4 1 8 10 1001 A4R132 0757 0405 4 2 RESISTOR 162 1 125W 0 100 24546 C4 1 8 T0 162R F A4R133 0757 0200 7 RESISTOR 5 62K 1 125W F TC 0 100 24546 C4 1 8 TO 5621 F A4R134 0698 8822 9 RESISTOR 6 81 1 125W F TC 0 100 28480 0698 8822 A4R135 0757 0405 4 RESISTOR 162 1 125W TC 0 100 24545 C4 1 8 TO 162R F A4R136 0757 0465 6 RESISTOR 100K 1 125W F 0 100 24546 C4 1 0 TO 1003 F A4R137 0757 0279 0 RESISTOR 3 16K 1 125W TC 0 100 24546 4 1 8 0 3161 A4R138 0757 0279 0 RESISTOR 3 16 1 125W F 0 100 24546 4 1 8 0 3161 A4R139 0757 1094 9 RESISTOR 1 47K 1 125W 0 100 24546 4 1 8 TO 147 1 4 140 0698 3153 9 RESISTOR 3 63K 1 125W 0 100 24546 C4 1 8 TO 3831 F 49141 0757 0280 3 RESISTOR 1 1 125W 0 100 24546 CA 1 8 TO 1001 F A4R142 2100 3350 5 RESISTOR TRMR 200 10 C SIDE ADJ 1 TRN 28480 2100 3350 A4R145 0698 7270 9 RESISTOR 26 1 1 05W F 0 100 24546 C3 1 8 TO 2612 F A4R146 0698 6630 3 RESISTOR 20K 1 125W F TC x 04 25 28480 0698 6630 A4R147 0598 7256 1 RESISTOR 6 81K 1 05W F 0 100 24546 C3 1 8 TO 6811 F A4R148 0698 6630 3 RESISTOR 20K 1 125W F 0 25 28480 0698 6630 A4R149 2100 3054 6 RESISTOR TRMR 50K 10 C SIDE ADJ 17
37. NwNNNN c 5 0 NNN aH b HD an lt aw G Qty Table 6 3 Replaceable Parts Description Mfr Code 08903 60128 SERIAL PREFIX 2450A TO 2720A HP8903B CAPACITOR FXD 1UF 10 50VDC CER 28480 CAPACITOR FXD 47PF 4 596 100VDC CER 0 30 28480 CAPACITOR FXD 10 10 5OVDC CER 28480 CAPACITOR FXD 1UF 10 SOVDC CER 28480 CAPACITOR FXD 2 2PF 25PF 100VDC CER 28480 CAPACITOR FXD 15UF 10 20VDC TA 56289 CAPACITOR FXD 150PF 5 100VDC CER 28480 CAPACITOR FXO 1UF 5 100VOC MET POLYC 28480 CAPACITOR FXD 1UF 10 50VDC CER 28480 CAPACITOR FXD 1UF 10 CER 28480 CAPACITOR FXD 1UF 4 59 100VDC MET POLYP 28480 CAPACITOR FXD 1UF 10 50VDC CER 28480 CAPACITOR FXD 150PF 5 100VDC CER 28480 CAPACITOR FXD 1UF 5 100VDC MET POLYP 28480 CAPACITOR FXD 1UF 5 100VDC MET POLYP 28480 CAPACITOR FXD 1UF 5 100VDC MET POLYP 28480 CAPACITOR FXD 1UF 5 100VDC MET POLYP 28480 CAPACITOR FXD 1UF 5 100VDC MET POLYP 28480 CAPACITOR FXD 47UF 80 20 SOVDC CER 28480 CAPACITOR FXD 22UF 10 15VDC 56289 CAPACITOR FXD 22UF 10 15VDC TA 56289 CAFACITOR FXD 22UF 10 15 0 TA 56289 CAPACITOR FXD 60UF 10 6VDC 56289 CAPACITOR FXD 33PF 5 100VOC CER 0 30 28480 CAFACITOR FXD 1UF 1 100VDC POLYSTY 28480 CAPACITOR FXD 1UF 4 109 35VDC TA 56289 CAPACITOR FXD 1 5PF 25PF 100VDC CER 28480 CAPACITOR FXD 01UF 4 109 100VDC CER 28480 CA
38. b GEE PROGRAMMABLE GAIN AMPLIFIER 15V F WEIGHTING BANDPASS AND HIGH PASS FILTERS C37 c38 R61 PGM 4001 1004 24 8 AMP 1 I O x R54 U3 C41 A NC 45V 6810 3r 7 2 1H W2 1000 U10242 13 THRU 1 1 15V F gat FILTER OPTION LOCATION IN FILTER 4 y A113 1 44 BANDPASS FILTER 1000 i FILTER YouT 80 VOUT 4 DEE 3 J FBK1 cec MENSEM T Ava B san 5 M48 TO LATCH 45 3 vr 15V 13 GND 1 10 l 5V F 5V F 5V IF 5V IF N Ex m T ird iens a 014 4 15 F 4 gt x i5V F I 15 F IN 0 IN AMP O 1 NC 2 6 IN 2 L k a asi was _ y INPUT RANGE DETECTOR 0 iu A 15V 0 0 HIGH PASS XA2A2 Ji BANDPASS FILTERA i g QUT 2 Vout 2 i i CONVERTER lust 2 FBK2 Vin RMS DC Cay d t15V F L9 33 15 DU 3 GND 4 1 10 E RMS i 1 18V F r 4 15V R83 sv F 45V NC gt 2 6 gt 1000 AMPLIFIER RMS A500 R50F L s 27 7 IN FILTER 2 L IN FILTER 1 IL C104 quu 1 vir 1 CG vin 1 CO ANALOG GROUND 1 CO DIGITAL GROUND Quam
39. l NOTE 2 en NOTE 2 4 LM R13 10 M dir ida 7 gu1 sain gt 8 Foe BUT 1910 21 5 21 5 I l 15V x 3 TIME FS 15V F amp ar ane Ws it lt lt 215 l diee d 15V CCIR 08903 60126 283 2370 38302 1620 0 15V F 4 4 15V C2 Static Sensitive AME 7 08903 60162 3080 0 620 45465 E e 6 l gt r3 P O A2 INPUT 2 1 OR A2A2 WEIGHTING FILTER ASSEMBLY OPTION 015 OR 055 08903 60161 AMPLIFIER ASSEMBLY 08903 60170 sne 1 STAGE STAGE 3 TAGE 4 0 STAGES i P O XA2A1 K XA2A2 P O XA2A1 5 F aK OR Ag 9 110 Ci RB ca GAIN 9 8 4640 0 047 C4 CE 15 0 0470 21 5 gt 7 VQuT i Y fis 45 iF gt 3 15V i p GND 1 2 10 21 5 I 15V F 4 15V F MEME zi NC E NC ii SERIAL PREFIX 24504 528 Figure 88 109 8 109 4 2 MP1 BLACK 0 C30 9 Rav 33 GAS Co ER 2 R35 84 2 R41
40. peak inverse voltage STET second plane angle sus c slow blow fuse aT phase lock used in parts list PLO phase lock oscillator SCR silicon controlled PM phase modulation rectifier screw PNP positive negative selenium positive SECT aaa sections P O P part of SEMICON semiconductor POLY 41 5295 polystyrene SHF superhigh frequency PORC porcelain silicon POS positive position s a Ye silver used in parts list SL tas a slide POSN position SNR signal to noise ratio POT usss yasa potentiometer SPDT 52525 single pole DD saw u peak to peak double throw PP peak to peak used cae ead spring in parts list iuis eL split ring PPM pulse position SPST single pole modulation single throw PREAMPL preamplifier SO tains neat Service Sheet PRF pulse repetition SSB single sideband frequency SST sexos stainless steel PRR pulse repetition rate SIL a fex SEA Sa steel DS core E ac ad picosecond Square point SWR standing wave ratio PTM pulse time SYNC synchronize modulation timed slow blow fuse PWM pulse width AS EE tantalum modulation TO ut Buceo temperature compensating NOTE All abbreviations in the parts list wil b
41. 0 25 28480 0698 6343 4 4 0698 6352 8 RESISTOR 1K 1 125W 0 25 28480 0698 6362 A4RS 0757 0441 8 RESISTOR 8 25K 1 125 0 100 24546 4 1 8 8251 A4P6 0757 0422 5 RESISTOR 909 1 125W F TC 0 100 24546 C4 1 8 T0 909R F A4F7 0698 8822 9 RESISTOR 6 81 1 125W F 0 100 28480 0698 8822 4 0698 8822 9 RESISTOR 6 81 1 125W 0 100 28480 0698 8822 A4R9 0698 8822 9 RESISTOR 6 81 1 125W F TC 204 100 28480 0698 8822 A4R10 0698 8822 9 RESISTOR 6 81 1 125W TC x 04 100 28480 0696 8822 4 11 0698 0084 9 RESISTOR 2 15K 1 125W TC 0 100 24546 4 1 8 0 2151 A4R12 0698 6360 6 RESISTOR 10K 1 125W 0 25 28480 0698 6350 A4R13 0698 6631 4 RESISTOR 2 5K 1 125W F TC zO 25 28480 0698 6631 4914 0757 0289 3 RESISTOR 1K 1 125 0 100 24546 1 8 0 1001 4 15 0757 0274 5 RESISTOR 1 21 1 125W 0 100 24546 4 1 8 1211 4816 0757 0274 5 RESISTOR 1 21 1 125W TC 0 100 24546 4 1 8 1211 A4R17 0757 0443 0 RESISTOR 11K 1 125W TC 0 100 24546 4 1 8 0 1102 A4R18 0757 0280 3 RESISTOR 1K 1 125W TC 0 100 24546 4 1 8 0 1001 A4R19 0757 0438 3 RESISTOR 5 11 1 125W F TC 0 100 24546 C4 1 8 TO 511 1 F A4R20 0757 0437 2 RESISTOR 4 75K 1 125W F TC 0 100 24546 4 1 8 0 4751 A4R21 NOT ASSIGNED A4R22 0757 1094 9 RESISTOR 1 47K 1 125W F TC 0 100 24546 4 1 8 70 1471 A4R23 0698 3484 9 RESISTOR 6 65 1 125W
42. 125W TC 0 100 RESISTOR 2 15K 1 125W F 0 100 RESISTOR 2 15K 1 125W 0 100 RESISTOR 10K 1 125W F TC 0 25 RESISTOR 10K 1 125W 0 25 RESISTOR 31 6K 1 125W F 0 100 RESISTOR 100K 1 125W F 0 100 RESISTOR 8K 1 125W F 0 100 RESISTOR 3 16K 1 125W F 0 100 RESISTOR 51 1K 1 125W 0 100 RESISTOR 20 5K 1 125W TC 0 100 RESISTOR 10K 1 125W 0 100 RESISTOR 215K 1 125W F 0 100 RESISTOR 100K 1 125 F 0 100 RESISTOR TRMR 100K 10 C SIDE ADJ 1 TRN RESISTOR TRMR 100K 10 SIDE ADJ 1 TRN RESISTOR 196K 1 125W F TC 0 100 RESISTOR 196K 1 125W 0 100 RESISTOR 511 1 125W 0 100 RESISTOR 511 1 125W F 0 100 RESISTOR 511 1 125W F 0 100 RESISTOR 511 1 125W F 0 100 RESISTOR 6 19K 1 125W F TC 0 100 RESISTOR 6 19K 1 125W 0 100 RESISTOR 3 16 1 125W 0 100 RESISTOR 3 16 1 125W 0 100 NOT ASSIGNED RESISTOR 6 81 1 125 F 0 100 19701 19701 19701 19701 19701 28480 28480 24546 24546 24546 24546 24546 24546 24546 24546 24546 24546 24546 24546 24546 24546 24546 24546 24546 24546 28480 28480 24546 24546 24546 24546 24546 24546 24546 24546 24546 28480 28480 24546 24546 24546 24546 24546 24546 19701 19701 24546 24546 24546 Facteory Scleeted Component Refer te Section 2 Model
43. 56289 56289 28480 28480 56289 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 56289 56289 28480 28480 56289 56289 56289 56289 56289 56289 56289 28480 56289 56289 28480 28480 28480 28480 28480 28480 28480 02037 28480 28480 28480 28480 Factory Selected Component Refer to Section 5 Replaceable Parts Mfr Part Number 08903 60130 150D685X9035B2 150D336X9010B2 0160 4832 0160 4832 150D685X9035B2 0160 4832 0160 4832 0160 4832 0160 4832 0160 4832 0160 4832 0160 4832 0160 4832 0160 4832 0160 4832 0160 4832 0160 4832 0160 4832 150D474X9035A2 150D474X9035A2 0160 4822 0160 4822 150D476X9020R2 150D476X9020R2 150D474X9035A2 150D474X9035A2 150D474X9035A2 150D685X9035B2 150D685X9035B2 0160 4789 150D474X9035A2 150D474X9035A2 1901 0040 1901 0040 1901 0050 1901 0050 1901 0050 1901 0050 1906 0042 MSD6101 1901 0050 1901 0050 1901 0050 1901 0050 A Errata part change 6 65 Replaceable Parts Qty a Reference HP Part C Designation Number D A7MP1 4040 0748 3 1480 0116 8 A7MP2 4040 0755 2 1480 0116 8 A7R1 A7R2 0757 0442 9 A7R3 1810 0205 7 A7R4 A7RS 0698 3155 1 A7R6 0757 0465 6 A7R7 0757 0465 6 7 8 0757 0440 7 A7R9 0757 0440 7 A7R10 0757 0440 7 7911 0757 0440 7 A7R12 0698 6320 8 A7R13 0G98 6320 8 A7R14 0698 3157 3 A7R15 0675 1021 8 A7R16 0675 1021 8 A7R17 0757 0438 3
44. A2A1 08903 60161 4 1 oR A2A2 08903 60161 4 1 A2A C1 0160 6326 5 A2A C2 0160 6324 3 4 A2A C3 0160 0578 7 6 2 0160 0578 7 2 5 0160 0578 7 2 6 0160 0578 7 A2A 0180 2661 5 2 8 0180 2661 5 A2A J1 1251 6063 1 A2A R1 0598 7262 9 2 A2A R2 0698 7215 2 1 A2A R3 2100 3351 6 4 A2A R4 0698 7243 6 3 A2A R5 0698 7257 2 A2A R6 0698 7254 9 A2A R7 0698 7260 7 A2A 0696 7252 7 A2A R9 0698 7253 8 A2A R10 0698 7275 4 1 A2A R11 0598 7287 8 1 A2A R12 0698 7288 9 1 2 R13 0698 7 195 8 A2A R14 0698 7196 8 A2A R15 0698 7256 5 1 2 01 1826 1290 5 4 Refer to Section 7 for update information reu 16FEB90 Table 6 3 Replaceable Parts Description Mfr Code A WEIGHTING FILTER 28480 OPTION 015 ONLY A WEIGHTING FILTER 28480 OPTION 055 ONLY C MPC 1060P 50V 28480 C 560P 50V 28480 CAPACITOR FXD 047UF 1 28480 CAPACITOR FXD 047UF 4 19 5OVDC 28480 047UF 1 SOVDC 28480 CAPACITOR FXD 047UF 1 SOVDC 28480 CAPACITOR FXD 1UF 10 50VDC 25088 CAPACITOR FXD TUF 10 50VDC 25088 CONNECTOR 10 POST TYPE 28480 RESISTOR 12 1K t 05W TC 20 100 24546 RESISTOR 133 1 OSW 0 100 24546 RESISTOR TRMR 500 10 C SIDE ADJ 1 TRN 28480 RESISTOR 1 96K 1 05W F TC 0 100 24546 RESISTOR 7 5K 1 05W 0 100 24546 RESISTOR 5 62K 1 05W F TC 0 100 24545 RESISTOR 10K 1 05W F 0 100 24546 RESISTOR 4 64K 1
45. Agilent Technologies Inc www agilent com 24001 E Mission Liberty Lake WA 99019 cs Agilent Technologies Innovating the HP Way June 8 2000 08903 90062 Volume 1 Dear Customer As of November 1 1999 four of Hewlett Packard s businesses test and measurement semiconductor products health care solutions and chemical analysis became a new company Agilent Technologies Now many of your Hewlett Packard products and services are in the care of Agilent Technologies At Agilent Technologies we are working diligently to make this transition as smooth as possible for you However as a result of this transition the products and related documentation contained in this shipment may be labeled with either the Hewlett Packard name and logo the Agilent Technologies name and logo or a combination of both Information in this package may refer to Hewlett Packard HP but applies to your Agilent Technologies product Hewlett Packard and Agilent branded products with the same model number are interchangeable Whatever logo you see the information products and services come from the same reliable source If you have questions about Agilent Technologies products and services please visit our website at http www agilent com Sincerely Rebranding Team 8903 AUDIO ANALYZER Including Option 001 Service Manual SERIAL NUMBERS This manual applies directly to instruments with serial numbers prefixed 2450A to
46. BVR 5V 28480 1990 0719 1058 1990 0719 8 14 LED LAMP LUM INT 1MCD IF 20MA MAX BVR 5V 28480 1990 0719 1069 1990 0719 8 2 LED LAMP LUM INT x 1MCD IF 20MA MAX BVR 5V 28480 1990 0718 0380 1231 7 2 SPACER RND 365 IN LG 12 N ID 00000 ORDER BY DESCRIPTION 10610 1990 0719 8 LED LAMP LUM INT 1MCD IF 20MA MAX BVR 5V 28480 1301 0329 1231 7 SPACER 365 IN LG 12 IN ID 00000 ORDER BY DESCRIPTION 10 11 1900 0518 6 5 LED LAMP LUM INT z 800UCD IF 20 28480 HLMP 0201 0340 1196 5 5 MOUNT L E D 0 120 005 IN ID 0 187 28490 0340 1196 10612 1920 0618 5 LED LAMP LLIM INT 800UCQ IF 20 28450 HLMP 0301 1196 5 MOUNT L E D 0 120 005 IN ID 9 187 28480 0340 1195 10613 1990 0618 6 LED LAMP LUM INT 800UCD IF 20MA MAX 28480 HLMP 0301 0340 1195 5 MOUNT L E D 0 120 005 IN ID 0 187 28480 0340 1196 A1DS14 1990 0618 6 LED LAMP LUM INT 8U0UCD IF 20MA MAX 28480 HLMP 02301 A1DS15 1990 0618 6 LED LAMP LUM INT 800UCD IF z 20MA MAX 28480 HUMP 0301 03401196 5 MOUNT L E D 0 120 005 IN ID 0 187 28480 0340 1196 A1DS16 1990 0618 6 LED LAMP 8000 IF 20MA MAX 28480 0301 03 0 1196 5 MOUNT L E D 0 120 005 IN 10 0 187 28480 0340 1196 10617 1990 0719 8 14 LED LAMP LUM INT 1MCD IF 20MA MAX BVR 5V 28480 1990 0719 A1DS18 1990 0719 8 14 LED LAMP LUM INT 1MCD IF 20MA MAX BVR 5V 28480 1990 0719 10619 1990 0719 8 14 LED LAMP LUM INT 1MCD IF 20MA MAX BVR 5V 28480 1990 0719 2450A TO 27304
47. MP17 NO LONGER AVAILABLE SEE SECTION 7 2910 AND ABOVE 10 5001 0539 9 1 STRIP SIDE 28480 5001 0539 MP11 5041 8819 8 2 HANDLE CAP FRONT 28480 5041 8819 0515 0262 9 2 SCREW THD RLG M3 X 0 5 7MM LG PAN HD 00000 ORDER BY DESCRIPTION ATTACHES HANDLE TO SIDE COVER MP12 5062 3703 3 2 STRAP HANDLE 28480 5062 3703 MP13 5041 8820 1 1 HANDLE CAP REAR 28480 5041 8820 2680 0118 5 SCREW MACH 10 32 5 IN LG 82 DEG 00000 ORDER BY DESCRIPTION ATTACHES HANDLE TO SIDE COVER 14 5062 3836 3 2 COVER SIDE 28480 5062 3836 15 08903 00150 5 1 PULL OUT CARD OPERATING INFO 28480 08903 00150 MP16 08903 00151 6 1 PULL OUT CARD ERROR DISPLAY HP IB 28480 08903 00151 MP17 08903 00149 2 1 PULL OUT INFO CARD TRAY 28480 08903 00149 18 1450 1345 5 1 TILT STAND SST 28480 1460 1345 2450A TO 2908A MPI9 NO LONGER AVAILABLE SEE SECTION 7 MP20 NO LONGER AVAILABLE SEE SECTION 7 2910 AND ABOVE 19 5041 8801 8 4 28480 5041 8801 20 5041 8821 2 4 STANDOFF REAR PANEL 28480 5041 8821 0515 0067 2 4 SCREW MACH M3 5 X 0 6 10MM LG PAN HD 28480 0515 0067 A Errata part change rev 20JUN91 Model 8903B Qty 12 Reference HP Part C Designation Number D MP21 22 08903 40001 9 MP23 08903 90047 8 MP24 08903 6020 3 0515 1950 4 2190 0584 0 1400 1016 1 25 1400 0997 0 0510 1239 8 2190 0584 0 MP26 MP27 08903 00102 7 0515 1950 4 28 08903 20054 0 0515 0357 3 0515 0374 4 29 08903 00010
48. Table 6 3 Replaceable Parts Description Mfr Code CAPACITOR FXO 150PF 5 100VDC CER 28480 CAPACITOR FXD 5 100VDC CER 28480 CAPACITOR FXD 1UF 10 CER 28480 CAPACITOR FXD 1UF 10 5OVDC CER 28480 CAPACITOR FXD 1UF 10 35VDC TA 56289 CAPACITOR FXD 1UF 10 SOVDC CER 28480 CAPACITOR FXD 47PF 5 100VDC CER 0 30 28480 CAPACITOR FXD 1UF 10 50VDC CER 28480 CAPACITOR FXD 1UF 4 109 CER 28480 CAPACITOF FXD 2 2PF 25PF 100VDC CER 28480 CAPACITOR FXD 15UF 10 20VDC TA 56289 CAPACITOR FXD 150PF 5 100VDC CER 28480 CAPACITOR FXD 1UF 5 100VDC MET POLYC 28480 CAPACITOF FXD 1UF 10 50VDC CER 28480 CAPACITOR FXD 1UF 10 SOVDC CER 28480 CAPACITOR FXD 1UF 5 100VDC MET POLYP 28480 CAPACITOR FXD 1UF 10 5 CER 28480 CAPACITOR FXO 150PF 5 100VDC CER 28480 CAPACITOR FXD 1UF 5 100VDC MET POLYP 28480 1UF 5 100VDC MET POLYP 28480 CAPACITOR FXD 1UF 5 100VDC MET POLYP 28480 1UF 5 100VDC MET POLYP 28480 CAPACITOR FXD 1UF 5 100VDC MET POLYP 28480 CAPACITOR FXD 47UF 80 20 e SOVDC CER 28480 CAPACITOR FXD 22UF 10 15 0 TA 56289 CAPACITOR FXD 22UF 10 15VOC TA 56289 CAPACITOR FXD 220 10 15VDC 56289 CAPACITOR FXD 600 10 6VDC 55289 CAPACITOR FXD 33PF 5 100VDC CER 0 30 28480 CAPACITOR FXD 1UF 1 100VDC POLYSTY 28480 CAPACITOR FXD 1UF 10 35VDC 56289 CAPACITOR FXD 1 5PF
49. tL c67 22 t7 5V R117 NOTCH 4456 CR21 4 lt BN NC 7 8 8118 SING END ra 1 E FROM INPUT AMPLIFIER 665 CA23 CBE 22 CR24 i RAMP GATE L 14 Gey COUNTER CONTROLLER R105 5 s 5620 5 5 47 77VDC n 7 5 vR2 7 5V so VE er UE dna 5V n NOLTAGE TO TIME CONVERTER HS i ET m Tle 0 s SSS A LSS M s u VOLTMETER INPUT SELECTOR qu 45 118 13 2 V MUXDMUX COMPARATOR 46 15 15 UR MUX n R134 10 n 8 6 81 C71 COMP 4 i TP40 n 2 DAMP GENERATOR R140 Mes 3830 4 R12B 5 2370 R429 E 2810 R139 1470 7 0 005 0 005VDC CR26 NOTE 1 CBS 33p 7 F REFERENCE V 15V R130 VA4 DC 3830 6 2V A129 Scat 4 CN R131 R125 R127 1000 25 464 t15V 15V R132 8135 lt 6 51 TO 5 89 VDO 162 152 0 39 TO 0 44 VDC VAS lt N 2 B 2V p i 010 012 011 de Q1 R119 VR3 t C68 R120 B25 2 87V gt 60 287 R133 5620 7 45 16 15V 45 R121 6190 31 89 10 12 18 VOC LH 96 Static Sensitive e T Devices A122 919 A126 909 10k n TO COUNT
50. 0160 5254 0160 4832 0160 4832 0160 4797 0160 4835 0160 4790 0160 4590 0160 5622 1901 0050 1901 0050 1901 0040 1901 0050 1901 0050 1901 0880 1901 0050 1901 0050 1901 0050 1901 0518 1901 0518 1901 0040 1901 0050 1901 0040 1901 0040 A Errata part change rcv 26 EB90 Model 8903 Reference Designation 4 AACR16 AACR17 AACR18 19 4 20 AACR21 AACR22 AACR23 AACR24 AACR25 AACR26 A4CR27 AACR28 A4CR29 AACR30 AACRS1 A4CR32 A4CR33 AACR 1 AAL1 412 414 AALS AAMP1 A4MP2 4 4012 402 A4Q3 A4Q4 A4Q5 A4Q6 A4Q7 A4Q8 A4Q9 A4Q10 4011 4012 AAR1 A4R2 AAR3 AARS AARG HP Part Number 1901 0050 1901 0880 1901 0880 1901 0880 1901 0880 1901 0880 1901 0880 1901 0880 1901 0880 1901 0040 1901 0880 1901 0050 1901 0050 1901 0880 1901 0880 1901 0880 1901 0880 1901 0050 1901 0880 0490 1423 9140 0210 9140 0210 9100 0539 9100 0539 9100 0539 4040 0748 1480 0116 4040 0752 1480 0118 0403 0026 08903 80069 1205 0202 1854 0753 1205 0202 1855 0420 1854 0830 1855 0420 1855 0420 1855 0420 1855 0420 1855 0420 1854 0071 1853 0281 1853 0281 0757 0279 0757 0441 0698 6343 0698 6362 0757 0441 0757 0422 C D M N N N N N N NONN 4 N oon Qty 10 36 Refer to Section 7 for update
51. 0490 1190 0490 1501 0490 1501 0490 1190 9140 0210 9140 0210 9140 0210 4040 0748 1480 0116 4040 0754 1480 0116 2N2219A 0340 0834 3225B 2N2905A 0340 0834 32258 A Errata part change rev LOFEB9O rev 1GFEB90 Model 8903D Reference HP Part C Qty Designation Number A6Q3 1853 0314 9 0340 0834 0 1205 0095 0 4 1854 0637 1 0340 0834 0 1205 0095 0 8 5 1855 0418 8 ABRI 0698 3430 5 AGR2 0698 3430 5 A6R4 0698 8822 9 A6F5 0698 8822 9 ASRE R13 AGR14 0698 0812 7 a A6R15 A6R16 0757 0401 0 A6R17 R19 20 0698 8812 21 0757 0401 0 A6F22 0698 7847 6 2 ABR23 0698 8812 7 AGR24 0698 6343 5 AGR25 0698 6343 5 26 0698 6362 8 AGR27 0698 3157 3 A6F28 0698 3157 3 29 0757 0401 0 AGR30 0698 6362 8 1 0698 7847 5 A6R32 2100 3353 8 1 0698 8825 2 A6F34 R45 6 0698 6524 5 2 A6R47 0699 1728 2 2 A6F48 0698 6624 5 AGRAS 0699 1728 2 A6R50 0757 0428 1 AGRS1 0757 0428 1 A6R52 0698 3430 5 A6R53 0698 3430 5 A6R54 0699 1726 0 2 AGRS5 0698 6348 0 AGRS6 0698 6348 0 ABRS7 0698 6346 0 AGR58 0696 6348 0 A6F59 0696 3430 5 6 0698 3430 5 tRefer to Section 7 for update information Table 6 3 Replaceable Parts Replaceable Parts Description Mtr Mfr Part Number Code TRANSISTOR PNP 2N2905A SI TO 39 PDz 600MW 04713 2N2905A INSULATOR XSTR POLYI 28480 0340 0834 HEAT SINK SGL TO 5 TO 39 CS 30161 32258 TRANSIST
52. 1 RB7 R70 CW 3B3k 1000 20k U23C As 5 F 0 005 10 0 005 VDO 10 AMS Q1B CR14 9 15V ZERO mE 3 3 R89 ADJ x3 1 5 81 ANG SUM AMPLIFIER 15V 15V QUT R99 1000 R148 20k R145 2B 1k ANTI LOG AMPLIFIER 77 M LOG RATIO METER AMPLIFIER N R56 0 008 TO 0 008VDC U17C 31 6k 13 R79 7500 C75 RiS6 TP11 LN 3 3p ik RECT A92 R93 21 5k 2000 ES Fi R91 37 68k 5000 P O A4 OUTPUT AMPLIFIER VOLTMETER ASSEMBLY 08903 60128 PR a a 7 0 008 0 008 VDC P O A13 P O A1 1 KEYBOARD AND DISPLAY ASSEMBLY I 08903 60166 GUTPUT OVLD L P O P 0 P O mE PELER 1 gt s n 14 f 14 9 METER PEG OFF SWITCH METER TRANSCONDUCTANCE OC 0 0 aVOC AMPLIFIER a7 206 13 5 POWER SUPPLY AND Use Y L 24 MOTHERBOARD 5 CO ASSEMBLY 08903 60129 5 5 s s QU 9 OU MPEG t Static Sensitive i t C2 sere os SS6 NOTE 4 AVG AMS DET SWITCH Figure 8B 117 88 117 SERIAL PREFIX 24504 Service Mode 8903B Component Coordinates NOTES D1 m Decouple probe with a 10k ohm resistor when measuring this voltage
53. 10 20VDC TA 56289 1500225 9020 2 A5C34 0180 0197 8 CAPACITOR FXD 2 2UF 10 20VDC 56289 1500225 9020 2 5 35 0160 2055 9 CAPACITOR FXD 01UF 80 20 100VDC CER 28480 0160 2055 ASC36 0160 2225 5 1 CAPACITOR FXD 2000PF 5 300VDC MICA 28480 0150 2225 A5C37 0180 0197 8 CAPACITOR FXD 2 2UF 10 20VDC TA 56289 1500225X9020A2 ASC38 0160 3454 4 1 CAPACITOR FXD 220 10 1 CER 28480 0160 3454 ASC39 0160 4251 1 1 CAPACITOR FXD 3300PF 0000000033 3 B4411 863UW 5 40 0160 3485 8 3 CAPACITOR FXD 100PF 10 1KVDC CER 28480 0160 3456 5 41 0160 2055 9 CAPACITOR FXD 01UF 80 20 100VDC CER 28480 0160 2055 5 42 0180 0291 3 CAPACITOR FXD 1UF 10 35VDC 56289 1500105 9035 2 A5C43 0180 0291 3 CAPACITOR FXD 1UF 10 35VDC 56289 1500105 9035 2 A5C44 0160 4521 8 2 CAPACITOR FXD 12PF 5 200VDC CER 0 30 28480 0160 4521 5 45 0160 4402 4 1 CAPACITOR FXD 1UF 10 100VDC POLYP 28480 0160 4402 tRefer to Section 7 fer update information Pactory Selected Component Refer to Section 5 A Errata part change rev 16FEB90 6 51 6 52 Replaceable Parts Reference HP Part C Qty Designation Number 5 46 0160 2255 1 1 5 47 0100 4084 8 1 A5C48 0160 3456 6 3 A5C49 0180 0291 3 A5C50 0160 5031 7 1 5 51 0160 2055 9 5 52 0160 2055 9 5 5 0160 4521 8 5 54 0180 0291 3 5 55 0160 2055 9 5 56 0180 0291 3 5 57 0160 2055 9 5 58 0160 2055 9 2450A 27204 5 59 ASCO 2723A AND
54. 25088 D1R0GS1A50K 2 0160 6323 2 2000 50 28480 0160 6323 2 4 0160 1759 4 5 CAPACITOR FXD 6800PF 1 200VDC 28480 0160 4759 A2A C5 0160 6324 3 C MPC 560P 50V 28480 0160 6324 2 6 0160 4759 4 CAPACITOR FXD 6800PF 1 200VDC 28480 0160 4759 A2A C7 0150 6325 4 2400P 50V 28480 0160 6325 A2A CB 0160 6606 4 1 CAPACITOR FXD 02UF 200VOC 28480 0160 6606 A2A J1 1251 6063 1 CONNECTOR 10 PIN POST 28480 1251 6063 A2A R1 0698 7196 8 RESISTOR 21 5 1 05W 0 100 24546 C3 1 8 TO 21R5 F A2A R2 0698 7196 8 RESISTOR 21 5 1 05W TC 0 100 24546 C3 1 8 TO 21F5 F A2A_R3 0698 5456 1 2 RESISTOR 5 7 1 125W 0 100 24546 C4 1 8 T0 5701 F 2 _ 0698 7257 2 7 RESISTOR 7 5K 1 05W F TC 0 100 24546 C3 1 8 T0 7501 F 2 _ 5 0698 7282 3 2 RESISTOR 82 5K 1 05W TC 0 100 24546 C3 1 8 TO 8252 F A2A R6 0598 7226 5 2 RESISTOR 383 1 05W TC 204 100 24546 C3 1 8 TO 383R F _ 7 2100 3350 5 3 RESISTOR TRMR 200 10 C SIDE ADJ 1 TRN 28480 2100 3350 A2A 0698 7239 0 RESISTOR 1 33K 1 05W TC 0 100 24546 C3 1 8 T0 1331 F A2A_R9 0698 7257 2 RESISTOR 7 5K 1 OSW F TC 0 100 24546 C3 1 8 T0 7501 F A2A R10 0698 3259 6 2 RESISTOR 7 87 1 125W 0 100 24546 4 1 8 0 7871 A2A R11 0696 7245 8 1 RESISTOR 2 37 1 05W F TC 0 100 24546 C3 1 8 T0 237 1 F 2 _ 12 0698 7257 2 RESISTOR 7 5K 1 05 TC 0 100 24546 C3 1 8 T0 7501 F A2A R13 0598 7250 5 1 RESISTOR 3 83 1 05W
55. 4 1 8 0 1471 4 1 8 1961 4 1 8 10 9091 4 1 8 10 3162 4 1 8 0 1001 4 1 8 0 1782 A Brrata part ehange 16 90 Model 8903B Reference HP Part C Designation Number D A5R61 0698 3430 5 A5R62 0698 3430 5 A5R63 0757 0442 9 A5R64 0757 0280 3 5 65 0757 0442 9 ASR66 0757 0442 9 A5R67 0757 0280 3 A5R68 5 69 0757 0442 9 A5F70 0757 0465 6 A5F71 ASR72 0698 3435 0 ASR 3 0698 3435 0 A5F74 0757 0280 3 5 75 5 76 0757 0401 0 A5F77 0757 0280 3 A5F78 0757 0280 3 A5R79 0757 0417 8 5 0698 3450 9 5 1 0757 0470 3 A5R82 0757 0288 1 ASRB3 0757 0280 3 A5R84 0757 0442 9 ASRB5 0757 0290 5 ASRB6 0698 3161 9 ASR87 0598 3430 5 ASR88 0757 0317 7 ASRB9 0698 3435 0 A5F90 0698 3435 0 A5F91 0757 0442 o 5 2 0757 0280 3 A5P93 0757 0438 3 5 94 0698 3435 0 5 95 0757 0442 9 ASR96 0757 0401 0 ASR97 0699 0400 5 A5F98 0698 8204 1 A5F99 0698 0083 8 A5R100 0698 3445 2 A5R101 0757 0401 0 A5R102 2100 3103 5 A5R103 0757 0280 3 A5R104 0698 6320 8 ASR105 0698 6320 8 ASR106 0757 0317 7 ASR107 0698 3430 5 ASR108 0698 3161 9 ASR109 0757 0428 1 ASR110 0757 0401 0 Refer te Section 7 for update information rev 16FEB90 Table 6 3 Replaceable Parts Description Mfr Code RESISTOR 21 5 1 125W TC z0O 4 100 03888 RESISTOR 21 5 1 125W F TC 0 100 03888 RESISTOR 10K 1 125W 0 100 24546 RESISTOR 1K 1 125W 0 100 24546 RESISTOR 10K 1 125W
56. AMPLIFIER OUTPUT 79 OUTPUT CRYSTAL Paty Tenet DRIVER AMPLIFIER CLAM Big NM ADDRESS BUSS ara OSCILLATOA AMPLIFIER AMPLIFIER C cow LEVEL 2 ATTENUATOR OUTPUT DETECTOA A ATTENUATOA MEMORY LEVEL ERROR ROM AND RAM MHz CLOCK AMPLIFIER OVER VOLTAGE REF DETECTOR BD 1 Figure 8A 101 8A 101 Model 8903 Service SERVICE SHEET BD2 Measurement Circuits Block Diagram PRINCIPLES OF OPERATION General Service Sheet BD2 covers the input circuits notch filter output circuits and part of the voltmeter that is it covers most of the measurement analyzer circuits of the instrument Input Amplifier A2 The Input Amplifier circuits amplify or attenuate the input signal so that its output is within 1 9 to 3V at the input to the Notch Filter overall input gain can be controlled by Special Function 1 for ac measurements and Special Function 2 for dc Other circuits provide ac or dc coupling over voltage protection differential to single ended conversion filtering and level sensing The HIGH and LOW INPUT connectors are the differential inputs A front panel switch permits convenient grounding of the LOW INPUT For ac measurements the AC DC Switch is set to ac couple the input Two pairs of voltage dividers form a balanced Input Attenuator The first divider pair is 12 dB the second divider pair have taps at 24 and 40 dB The input level range and the associated a
57. CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ CONNECTOR SGL CONT PIN 1 14 5 62 SQ CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ IC OP AMP LOW BIAS H IMPD DUAL 8 DIP C IC OP AMP LOW BIAS H IMPO DUAL I DIP C IC 7812 V RGLTR TO 3 WASHER LK HLCL NO 6 141 IN ID SCREW MACH 6 32 562 IN LG PAN HD POZI OIODE ZNR 68 1V 5 DO 7 PDz 4W TG 079 DIODE ZNR 68 1V 5 DO 7 4W TCz 079 DIODE ZNA 12V 5 00 35 PD 4W 077 DIODE ZNR 9 1V 5 00 35 PD 4W TC 069 DIODE ZNR 2 4V 5 00 35 PD 4W TC 037 DIODE ZNR 12V 5 DO 35 PDz 4W 277 DIODE ZNR 16 2V 2 DO 35 PDz 4W DIODE ZNR 13 3V 2 DO 35 PDz 4W DIODE ZNR 5 76V 2 DO 35 4W DIODE ZNR 16 2V 2 DO 35 4 DIODE ZNR 5 11V 2 DO 35 PDz 4W CONNECTOR PC EDGE 15 CONT ROW 2 ROWS CONNECTOR PC EDGE 22 CONT ROW 2 ROWS CONNECTOR PC EDGE 15 CONT ROW 2 ROWS CONNECTOR PC EDGE 15 CONT ROW 2 ROWS CONNECTOR PC EDGE 15 CONT ROW 2 ROWS CONNECTOR PC EDGE 15 CONT ROW 2 ROWS CONNECTOR PC EDGE 15 CONT ROW 2 HOWS CONNECTOR PC EDGE 22 CONT ROW 2 ROWS CONNECTOR PC EDGE 15 CONT ROW 2 ROWS CONNECT OR PC EDGE 22 CONT ROW 2 ROWS CONNECT OR PC EDGE 22 CONT ROW 2 ROWS CONNECTOR PC EDGE 22 CONT ROW 2 ROWS CONNECTOR PC EDGE 22 CONT ROW 2 ROWS Mfr Code 08903 60129 192 292 SERIAL PREFIX 2450A TO 2922A 28480 28480 28480 28480 28480 28480 01295 01295 07263 28480 00000 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 2848
58. Description BD BLK POLYC 062 BD THKNS 6 PIN GRV 062 IN DIA 25 IN LG STL EXTR PC BD RED POLYC 062 BD THKNS PIN GRV 062 IN DIA 25 IN LG STL STDF 375L NOT ASSIGNED TRANSISTOR J FET 2N5268 D MODE TRANSISTOR PNP SI PO 625MW FT 200MHZ TRANSISTOR J FET 2N5268 P CHAN D MODE TRANSISTOR J FET 2 5268 P CHAN D MODE TRANSISTOR PNP SI PD 625MW FT 200MHZ TRANSISTOR JFET DUAL N CHAN D MODE S TRANSISTOR JFET DUAL N CHAN D MODE TO 71 SEE A207 MATCHED PAIR TRANSISTOR JFET DUAL N CHAN D MODE 71 NOT ASSIGNED RESISTOR 1K 1 SW F 0 100 RESISTOR 112 32K 1 1W F TC 0 25 RESISTOR 37 68K 1 25W 0 25 RESISTOR 681K 1 125W 0 100 RESISTOR 281 07K 1 SW 0 25 RESISTOR 15 93K 1 25W F TC 0 25 RESISTOR 1 125W 0 25 RESISTOR 261K 1 125W TC 0 100 NOT ASSIGNED NOT ASSIGNED RESISTOR 3 48K 1 125W 0 100 RESISTOR 100K 1 125W TC 0 100 RESISTOR 6 19K 1 125W F TC 0 100 RESISTOR 100K 1 125W F TC 0 100 NOT ASSIGNED RESISTOR 5 11K 1 5 F 0 100 NOT ASSIGNED NOT ASSIGNED RESISTOR 2 37K 1 125W F TC 0 100 NOT ASSIGNED RESISTOR 2 37K 1 125W TC 0 100 NOT ASSIGNED RESISTOR 21 5 1 05W TC 0 100 RESISTOR 21 5 1 OSW TC 0 100 RESISTOR 683 8 1 125W TC 0 25 RESISTOR 493 1 25W F 0 25 RESISTOR 493 1 25W 0 25 RESISTOR 21 5 1 05W TC 0 100 RESISTOR 21 5 1 OSW F
59. NAND QUAD 2 INP IC CNTR TTL LS BIN ASYNCHRO CNTR TTL LS BIN ASYNCHRO TTL LS QUAD 2 INP GATE TTL LS NAND QUAD 2 INP IC INV TTL LS HEX 1 INP IC GATE TTL LS TPL 3 INP IC TTL LS 3 TO 8 LINE IC FF TTL LS D TYPE POS EDGE TRIG GATE LS OR QUAD 2 INP IC MPU CLK FREQ 2 MHZ ENHANCED 6800 PROGRAMMED ROM IC DCDR TTL LS 2 TO 4 LINE DUAL CMOS 65536 64K STAT RAM 150 5 3 5 GATE TTL LS QUAD 2 INP IC PERIPHERAL INTERFACE ADAPTER CLK 2 2 TTL LS LINE IC fjv TTL AS HEX TTL LS 3 TO 8 LINE 3 INP IC MISC B DIP P PKG CRYSTAL QUARTZ 8 0 MHZ HC 18 U HLDR BD BLK POLYC 062 IN BD THKNS EXTR PC GRA POLYC 052 IN BD THKNS PIN GRV O62 IN DIA 25 IN LG STL RIVET SEMITUB 089DIA 12216 CLIP CMPNT 139 154 DIA STL SOCKET iC DIP 28 CONT DIP DIP SLDR SOCKET IC DIP 40 CONT DIP DIP SLDR Mfr Code 28480 28480 28480 28480 12498 12498 12498 12498 12498 C1433 C1433 81073 12360 12360 01295 01295 01295 01295 01295 01295 01295 01295 01295 01295 01295 01295 01295 04713 28480 01295 4013 01295 04713 01295 01295 01295 01295 11236 28430 28480 73957 28480 91506 01295 01295 Pactory Selected Component Refer te 7 Model 8903B Mfr Part Number HLMP 3600 3600 HLMP 3600 HLMP 3500 CTA4 1 8 TO 10 1 F CT4
60. On the Audio Analyzer key in 3 2 SPCL The waveform should be between 1 1 and 1 3 Vpp Hint Pin 8 of U7 should be a TTL low Pin 16 of U7 should be a high 11 On the Audio Analyzer key in 55 0 SPCL 56 15 SPCL and 57 140 SPCL to set the SOURCE frequency to 13 Hz The waveform should be between 1 1 and 1 3 Vpp Hint Pin 1 of should be a TTL low Pins 3 and 4 of should be shorted 12 On the Audio Analyzer key in 0 435 SPCL to insert the 13 Hz High Pass Filter U14A and associated components The waveform should be between 0 7 and 1 0 Vpp Hint Pin 1 of KI should be a TTL high Pins 3 and 5 of K1 should be shorted The waveform at pin of U14A should be between 80 and 130 mVpp 8B 41 Service Model 8903B cm SHEET 6 4A4 Output Amplifier Voltmeter Assembly Detector and Meter Cir cuits PRINCIPLES OF OPERATION General This portion of the Output Amplifier Voltmeter A4 contains the Output RMS Average Quasi peak Detector Output Overload Detector and SINAD meter circuitry Output RMS Average Quasi peak Detector The circuits on the upper half of the schematic diagram form the Output RMS Average Quasi peak Detector referred to in the block diagrams When used as a true rms converter the Output RMS Average Quasi peak Detector converts the ac input signal into a dc voltage equal to the root mean square rms of the input level The circuits form an analog computer which converts the ac signal to its dc rms e
61. See Service Sheet 4 and check the Notch Filter tune and balance lt 2 gt Pre Notch RMS and Average Detectors Check 1 On the Audio Analyzer key in 41 0 SPCL to initialize the instrument Set the INPUT and OUTPUT switches to ground Key in AMPTD V Kev in 1 11 SPCL to set the input gain to 0 dB Connect the HIGH OUTPUT to the HIGH INPUT 8B 33 Service Model 8903B TROUBLESHOOTING SERVICE SHEET 3 Table 8B 23 Voltage at A3TP7 435 Step 9 Notch Level at Level Vdc at U10 Pin Filter Special A3TP7 Function Mode Vpp Notch 44 1 lt 2 1 0 0 Flat 44 2 5 4 to 6 6 0 15 Bandpass 44 3 4 8 to 7 2 15 0 2 Connect high impedance ac coupled to 2 OUT waveform should be 2 7 to 2 9 Vpp The period of the signal should be approximately 1 ms Hint If the signal is faulty see Service Sheet 2 and check the Programmable Gain Amplifier 3 Use the oscilloscope s vertical gain controls to adjust the waveform amplitude for 7 1 divisions peak to peak 4 Connect the oscilloscope dc coupled 5 RMS2 dc level observed on the oscilloscope should be between 2 4 and 2 6 Vdc Grounding pin 6 of U18B should have no effect Hint Pin 15 of U19 should be a TTL low 5 On the Audio Analyzer key in 5 2 SPCL The dc level observed on the oscilloscope should be between 2 4 and 2 6 Vdc Grounding pin 6 of U18B should cause the voltage to be about 15 Vdc H
62. Service CHANGES On the A2 schematic All serial prefixes e 08903 60170 Use the partial schematic on page 8 104 3 e W2 Delete W2 jumper and replace it with R134 10 ohm P O XA2B In the P O A13 section delete the connection between P O XA2B and pin 27 Delete P O and change XA2B to XA2A Add XA2B to the right of pin 27 On the A13 Component Locator e JP3 Delete W2 and replace it with 134 On the A13 Component Coordinates W2 Delete W2 and add R134 A 2 2717A to 2742A On the A13 schematic e 08903 60192 Change the part number of the A13 POWER SUPPLY AND MOTHERBOARD ASSEMBLY to 08903 60192 2813A and above On the A13 schematic e 08903 60292 Change the part number of the A13 POWER SUPPLY AND MOTHERBOARD ASSEMBLY to 08903 60292 SS2 rev 4FEB89 8B 104 1 8903 Service TO NOTCH FILTER R18 1000 TO LATCH TO OUTPUT AMPLIFIER 7 P O A2 Input Amplifier Assembly 552 rev 12NOV 86 8 104 3 P O AND A13 POWER SUPPLY MOTHERBOARD ASSEMBLY 08304 41 2 FROM LATCH 12 3 l l 2 2 12 G 2 gt 21 4 2 4 P O 2 INPUT AMPLIFIER ASSEMBLY 08903 60170 P O A13 ne eee uaWKns Q m j Qasam ee em ee e eee WG Qs i
63. TC 0 100 24546 4 1 8 0 1001 2994 ASSIGNED A2R95 NOT ASSIGNED 2 96 0698 7253 8 RESISTOR 5 11K 1 05W F 0 100 24546 3 1 8 0 5111 2 7 ASSIGNED A2FR98 0898 7255 o 5 RESISTOR 6 18K 1 05W F 0 100 24546 C3 1 8 TO 6191 F A2F99 0698 7255 0 RESISTOR 6 19K 1 05W F TC 0 100 24546 C3 1 8 T0 6191 F A2R100 0699 0413 0 RESISTOR 112 32K 1 1W F TC 0 25 28480 0699 0413 A2R101 0699 0526 6 RESISTOR 37 68K 1 25W 0 25 28480 0699 0526 29102 0698 8825 2 RESISTOR 681K 1 125W F TC 0 100 28480 0598 8825 A2R103 0699 0402 7 RESISTOR 281 07K 1 5W F 0 25 28480 0699 0402 A2R104 0757 0159 5 RESISTOR 1K 1 5W F 0 100 28480 0757 0159 A2R105 0757 0833 2 RESISTOR 5 11K 1 SW F 0 100 28480 0757 0833 A2R106 0757 0465 6 RESISTOR 100K 1 125W TCz0 4 100 24546 C4 1 8 TO 1003 F A2R107 0757 0465 6 RESISTOR 100K 1 125W F TC 0 100 24546 4 1 8 0 1003 2 1108 0698 7254 9 4 RESISTOR 5 62K 1 05W F TC 0 100 24546 C3 1 8 T0 562 1 F A2R109 0698 7254 9 RESISTOR 5 62K 1 05W F 0 100 24546 C3 1 8 TO 5621 F A2R110 0698 7252 7 4 RESISTOR 4 64K 1 05W F 0 100 24546 C3 1 8 TO 4641 F A2R111 0698 7253 8 RESISTOR 5 11K 1 05W 0 100 24546 3 1 8 0 5111 A2R112 0698 7253 8 RESISTOR 5 11K 1 05W 0 100 24546 C3 1 8 TO 5111 F A2R113 0698 7 196 8 RESISTOR 21 5 1 05W F 0 100 24546 C3 1 8 TO 21R5 F A2R114 0698 7196 8 RESISTOR 21 5 1 05W F TC 0 100 24546 C3 1
64. TC 0 100 24546 RESISTOR 10K 1 125W 0 100 24546 RESISTOR 1K 1 125W F 0 100 24546 NOT ASSIGNED RESISTOR 10K 1 125W 0 100 24546 RESISTOR 100K 1 125W F 0 100 24546 NOT ASSIGNED RESISTOR 38 3 1 125W F 0 100 24546 RESISTOR 38 3 1 125W F TC 0 100 24546 RESISTOR 1K 1 125W 0 100 24546 NOT ASSIGNED RESISTOR 100 1 125W F TC 0 100 24546 RESISTOR 1K 1 125W 0 100 24546 RESISTOR 1 125W 0 100 24546 RESISTOR 562 1 125W 0 100 24546 RESISTOR 42 2K 1 125W F TC 0 100 24546 RESISTOR 162K 1 125W F 0 100 24546 RESISTOR 9 09K 1 125W F 0 100 19701 RESISTOR 1K 1 125W TC 0 100 24546 RESISTOR 10K 1 125W F 0 100 24546 RESISTOR 6 19K 1 125W 0 4 100 19701 RESISTOR 38 3K 1 125W TC 20 100 24546 RESISTOR 21 5 1 125W TC 0 100 03888 RESISTOR 1 33K 1 125W 0 100 24546 RESISTOR 38 3 1 125W TCzO 100 24546 RESISTOR 38 3 1 125W 0 100 24546 RESISTOR 10K 1 125W TC 04 100 24546 RESISTOR 1K 1 125W F TC 0 100 24546 RESISTOR 5 11 1 125W F TCzO 4 100 24546 RESISTOR 38 3 1 125W F 0 100 24546 RESISTOR 10K 1 125W 0 100 24546 RESISTOR 100 1 125W 0 100 24546 RESISTOR 3 6K 1 e 125W F 1 0 25 28480 RESISTOR 7 98 1 125W F 0 25 19701 RESISTOR 1 96 1 125W F 0 100 24546 RESISTOR 348 1 125 0 100 24546 RESISTOR 100 1 125W TC 0 100 2
65. Table 8B 12 Gain of the Differential to Single L nded Amplifier State of Ki State of K2 Gain dB 0 Open Open Open Closed 8 Closed Open 16 Closed Closed 20 U5 subtracts the output of U6 from U12 Its gain with respect to the output of U6 is 1 its gain with respect to 1712 is 1 if the divide by two voltage divider R41 R42 and R43 is taken into account R43 is adjusted to equalize the two gains and thus reject the common mode signal C25 C26 C27 and C32 flatten the frequency response of the two amplifiers Dual FETs Q7 and Q9 provide a high input impedance Dual FETs Q8 and Q10 minimize high frequency distortion generated by ac modulation of the drain to gate capacitance of Q7 and Q9 8B 15 Service Model 8903B PRINCIPLES OF OPERATION SERVICE SHEET 1 Relay Drivers 015 is TTL octal peripheral driver capable driving the relays The relays energize when the relay driver outputs go low The diodes across the relay coils suppress the inductive transient generated by the coil when the current is interrupted U14 decodes the attenuation control lines for the 40 dB attenuator Humidity Sealing The area surrounding the relays of this assembly have been coated with a humidity seal The area is marked on the circuit board If components in the sealed area are replaced it is recommended that solder flux be removed and that a humidity sealant such as HP 8500 3266 be applied w
66. abbreviated Full designation includes assembly number for example Asterisk indicates factor Ri of assembly selected components See Gy of BREEAM Shy 1 847 other components Value selected for best operation Value shown is average or most commonly selected value denotes white base yellow wide stripe violet narrow stripe are complete as shown numbered Large numbers in lower right corners of schematic diagrams are service sheet numbers 8 21 Service Model 8903B SCHEMATIC SYMBOLOGY AND SCHEMATIC DIAGRAM NOTES Table 8 6 Schematic Diagram Notes 2 of 11 Values for all components are marked in units of farads henries and ohms unless otherwise specified gt gt gt el 2 e CO 8 8 22 Asterisk denotes a factory selected value Value shown is typical See Section V Tool aided adjustment Encloses front panel designation Encloses rear panel designation Circuit assembly borderline Other assembly borderline Heavy line with arrows indicates path and direction of main signal Heavy dashed line with arrows indicates path and direction of main feedback Indicates stripline i e RF transmission line above ground Wiper moves toward cw with clockwise rotation of control as viewed from shaft or knob Numbered Test Point measurement aid provided Encloses wire or cable color code Code used is the same as the resistor color code First nu
67. differential signal to a signal referenced to ground The gain of the amplifier can be set to 0 8 16 or 20 dB For the dc level measurement mode the gain is always 0 dB The amplifier is dc coupled When dc level is selected the output of the amplifier is measured by the dc voltmeter The output is also sensed by the Input Overload Detector If the level is more positive than 8 7V or more negative than 8 7V the detector sets the Input Attenuator to the 40 dB range until the proper range has been determined by the Controller Programmable Gain Amplifier can be set for 0 4 8 or 20 dB gain and is ac coupled The Input Range Detector is used to set the gain of the input path Input Attenuator Differential to Single Ended Amplifier and Programmable Gain Amplifier Since it is positioned before the Weighting Bandpass and High Pass Filters it prevents overloading of the filters by input signals located in the filter stopbands gain of the detector is programed to match the passband gain of the selected filter The gain is programed indirectly by the Controller via the filter circuits The gain of the input path is set so that the signal is between 1 7 and at the Input Range Detector This is the optimum level for the Input Range Detector the Pre Notch RMS Average Detector and the Notch Filter rev 20J 0 87 8A 1 Service Model 8903B At this point one of two filters can be inserted in the audio path fi
68. see Service Sheet 5 18 On the Audio Analyzer press DISTN Key in AMPTD 2 5 V Key in 44 1 SPCL to set the Notch Filter to the notch mode Key in 3 0 SPCL to set the output amplifier gain to automatic The amplitude display should read 0 0196 or less Hint The gates of Q7 and Q9 should be and the FETs should be on The gates of Q6 and Q10 should be 15 and the FETs should be off The signal at A3TP7 OUT should be less than 100 mVpp 19 the Audio Analyzer key in 54 139 SPCL Note the amplitude display Key in 54 155 SPCL Note the amplitude display In both cases the display should be 0 0196 or less 20 On the Audio Analyzer key in FREQ 20 Hz Key in 53 0 SPCL and 54 23 SPCL to tune the Notch Filter to 20 Hz The amplitude display should be 0 0196 or less Hint The gates of and 010 should be and the FETs should be on The gates of Q7 and Q9 should be 15V and the FETs should be off The signal at A3TP7 should be less than 100 mVpp 8B 37 Service Model 8903B TROUBLESHOOTING SERVICE SHEET 4 21 On the Audio Analyzer key in FREQ 10 kHz Key in 53 2 SPCL and 54 184 SPCL to tune the Notch Filter to 10 kHz The amplitude display should be 0 01 or less Hint The gates of Q7 Q9 and QIO should be 15 and the FETs should be off The signal at A3TP7 should be less than 100 mVpp 22 On the Audio Analyzer key in FREQ 20 kHz Key in 53 3 SPCL and 54 46 SPCL to tune the Notch Filter to 2
69. 0 100 24546 4 1 8 0 6651 4 24 0698 4470 5 RESISTOR 6 98 1 125W TC 0 100 24546 4 1 8 0 698 1 4 25 0598 315 7 RESISTOR 2 87 1 125W TC 0 100 24546 4 1 8 0 2871 4926 0757 0447 4 RESISTOR 16 2K 1 125W F 0 100 24546 1 8 10 1622 4927 0698 3151 7 RESISTOR 2 87 1 125W TC 0 100 24546 4 1 8 0 2871 A4R28 0757 0439 4 RESISTOR 6 81K 1 125W 0 100 24546 C4 1 8 T0 6811 F A4Re9 0698 6631 4 RESISTOR 2 5K 1 125W 0 25 28480 0698 6631 A4R30 0698 6631 4 RESISTOR 2 5K 1 125W F TC 0 25 28480 0698 5531 4931 0757 0199 3 RESISTOR 21 5K 1 125W TC 0 100 24546 C4 1 8 TO 2152 F 4932 0757 0280 3 RESISTOR 1K 1 125W TC 0 100 23546 C4 1 8 1001 A4R33 0757 0422 5 RESISTOR 909 1 125W TCz 04 100 24546 C4 1 8 T0 909R F 4934 0698 6343 5 RESISTOR 9K 1 125W 0 25 28480 0698 5343 A4R35 0698 6362 8 RESISTOR 1K 1 125W TC 204 25 28480 0698 6362 A4R36 0757 0447 4 RESISTOR 16 2K 1 125W F 0 4 100 24546 1 8 0 1622 A4R37 0757 0447 4 RESISTOR 16 2K 1 125W F TC 0 100 24546 4 1 8 0 1622 A4R38 0698 3151 7 RESISTOR 2 87 1 125W F TC 0 100 24546 C4 1 8 T0 287 1 F A4R39 0757 0447 4 RESISTOR 16 2K 1 125W TC 0 100 24546 4 1 8 0 1622 4 40 0698 3151 7 RESISTOR 2 87K 1 125W TC 0 100 24546 4 1 8 0 2871 4841 0757 0470 3 4 RESISTOR 162K 1 125 F TC 204 100 24546 4 1 8 0 1623 Refer te Section 7 fer
70. 0 25 19701 RESISTOR 256K 1 125W 0 25 19701 RESISTOR 511K 1 125W 0 50 28480 RESISTOR 1M 1 125W TC 0 25 28480 RESISTOR 562 1 125W F TC 0 100 24546 RESISTOR 16 2K 1 125W 0 100 24546 NETWORK RES 8 SIP10 0K OFM X 7 01121 RESISTOR 6 19K 1 125W F 0 100 19701 RESISTOR 51 1 1 125W F TC 20 100 24546 RESISTOR 10K 1 125W 0 100 24546 RESISTOR 10K 1 125W F TC 0 100 24546 RESISTOR 21 5 1 125 TC 0 100 03888 RESISTOR 21 5 1 125W F 0 100 03888 RESISTOR 1K 1 125W F 0 100 24546 RESISTOR 7 98K 1 125W 0 25 19701 RESISTOR 15 98K 1 125W F 0 25 19701 RESISTOR 32K 1 125W 0 25 19701 RESISTOR 64K 1 126W F 0 25 19701 RESISTOR 128K 1 125W F 0 25 19701 RESISTOR 256K 1 125W F 0 25 19701 RESISTOR 511K 1 125W F TC 0 50 28480 RESISTOR 1M 1 125W 0 25 28480 RESISTOR 21 5 1 125W F 0 100 03888 RESISTOR 21 5 1 125W F 0 100 03888 RESISTOR 51 1 1 125W F TC 0 100 24546 RESISTOR 21 5 1 125W 0 100 03888 RESISTOR 21 5 1 125W 0 100 03888 RESISTOR 1K 1 125W F 0 100 24546 RESISTOR 64K 1 125W F TC 0 25 19701 RESISTOR 32K 1 125W F 0 25 19701 RESISTOR 15 98K 1 125W TC 0 25 19701 RESISTOR 7 98 1 125W 0 25 19701 RESISTOR 21 5 1 125W 0 100 03888 RESISTOR 42 2 1 125W TC 0 100 24546 RESISTOR 19 6K 1 125W 0 100 24546 RESI
71. 0 RESISTOR 100 1 125W 0 100 24546 4 1 8 0 101 2450A TO 29224 18 15 0757 0401 0 RESISTOR 100 1 125W F 0 100 24546 4 1 8 0 101 A13R16 0757 0401 0 RESISTOR 100 1 125W TC 0 100 24546 4 1 8 0 101 13 17 0757 0401 0 RESISTOR 100 1 125W F TC 0 100 24546 4 1 8 70 101 A13R18 0757 0280 3 RESISTOR 1K 1 125W 0 100 24546 4 1 8 70 1001 13 19 0757 0401 0 RESISTOR 100 1 125W F TC 0 100 24546 4 1 8 0 101 24504 TO 2910A 1320 0757 0442 9 RESISTOR 10K 1 125W F 0 100 24546 4 1 8 0 1002 2922 ONLY 41320 0698 3437 2 RESISTOR 133 1 125W 0 100 24546 CA 1 8 TO 133R F 21504 TO 29224 AJSR21 0757 0401 RESISTOR 100 1 125W TC 0 100 24546 4 1 8 101 24504 TO 29 0 AI3R22 0757 0442 9 RESISTOR 10K 1 125W 0 100 24546 4 1 8 0 1002 2922A ONLY AISR22 0757 0401 0 RESISTOR 100 1 125W TC 0 100 24546 4 1 8 101 A13R23 0757 0401 0 RESISTOR 100 1 125W F 0 100 24546 C4 1 8 TO 101 F 13 24 0757 0442 9 RESISTOR 10K 1 125W 0 100 24546 4 1 8 0 1002 A13R25 0757 0401 0 RESISTOR 100 1 125W 0 100 24546 Ca 1 8 TO 101 F 2450 29104 AI3R26 0757 0442 9 RESISTOR 10K 1 125W 0 100 24546 1 8 10 1002 2922A ONLY 413826 0698 3437 2 RESISTOR 133 1 125W 0 100 24546 C4 1 8 TO 133R F A13R27 0698 8827 4 RESISTOR 1M 19 125W F 0 100 28480 0698 8827 24504 2652 Al3R
72. 0005 1 2360 0229 1 2420 0002 6 3050 0227 3 A13Q3 1884 0276 7 1 2190 0005 1 2360 0229 1 2420 0002 6 3050 0227 3 24504 TO 2910A AQT 1884 0244 9 3 41365 1884 0244 9 41896 1884 0244 9 29224 ONLY A13Q1 1884 0345 1 3 A13Q5 1884 0345 1 A13Q6 1884 0345 1 2450A TO 265274 A13Q7 2717A TO 20224 42307 1854 0477 7 Refer te Section 7 for vpelate informaties 6 90 Tuble 6 3 Replaceable Parts Description DIODE PWR 400V 750 DO 41 DIODE GEN PRP 180V 200MA DO 7 DIODE GEN 180V 200MA 00 7 DIODE GEN PRP 180V 200MA DO 7 DIODE GEN PRP 160V 200MA 00 7 DIODE PWR RECT 400V 750MA DO 41 DIODE PWR RECT 400V 75 DO 41 DIODE PWR RECT 400V 750MA 00 41 DIODE PwR 400V 750MA DO 41 DIODE PWR RECT 400V 750 DO 41 DIODE PWR 400V 750 DO 41 LED LAMP LUM INT 800UCD IF 30MA MAX LED LAMP LUM INT zx BDOUCD IF 30MA MAX LEO LAMP LUM INT 800UCD IF 30MA MAX LED LAMP LUM INT 800UCD IF 30MA MAX CONNECTOR 26 PIN RECTANGULAR CONNECTOR 6 POST CONNECTOR 6 PIN M POST TYPE RESISTOR ZERO OHMS 22 AWG LEAD DIA RESISTOR ZERO OHMS 22 AWG LEAD DIA CONNECTOR 6 PIN M POST TYPE INDUCTOR RF CH MLD 1MH 5 20 45LG Q 60 INDUCTOR FIXED 120 1300 HZ INDUCTOR FIXED 120 1300 HZ INDUCTOR FIXED 120 1300 HZ INDUCTOR FIXED 120 1300 HZ INDUCTOR FIXED 120 1300 112 INDUCTOR RF CH MLD 100UH 5 1660 38510 BUMPER FOOT ADH 12 7 MM WD TRANSISTOR NPN 2N2222A SI 18 P
73. 0160 2237 0160 4786 0160 2236 0160 4801 0160 4832 0160 4791 0160 4801 0160 4791 0160 4801 0121 0527 0121 0527 Errata part change rev GFEB90 Model 8903 Reference Designation A2CH1 2 2 A2CR3 A2CR4 2 5 A2CH6 A2CR7 A2CR8 24504 2520 5 2619 2 10 A2CH11 2 12 2607 AND ADOVE A2CRY A2CR10 A2CR11 A2CR12 A2CR13 CR17 A2CR18 2 19 A2CR20 A2CR21 A2CR22 A2CR23 A2CR24 21504 TO 2520A 2 125 A2CR26 A2CR27 AZCHZ2S 20014 AND ABOVE A2CR25 A2CR26 A2CR27 AZCN28 A2CR29 CR34 A2CR35 2 1 A2K2 A2K3 A2K4 A2K5 A2K6 A2K7 A2L1 A2L2 A2L3 fRefer te Section 7 for update information rev 1G6FE B90 HP Part Number 1901 0050 1901 0050 1901 0050 1901 0050 1901 0050 1901 0050 1901 0050 1901 0376 1901 0050 1901 0376 1901 0050 1901 0050 1901 0880 1901 0050 1901 0880 1901 0050 1901 0050 1901 0050 1901 0050 1901 0050 1901 0376 1901 0050 1901 0376 1901 0880 1901 0050 1901 0880 1901 0050 1901 0050 0490 0916 0490 0916 0490 1484 0490 1484 0490 1484 0490 1484 9140 0114 9100 2430 9140 0114 OW O 9 Ww GN GO Q lt C ua Qty 57 44 Table 6 3 Replaceable Parts Description DIODE SWITCHING 80V 200MA 2NS 00 35 DIODE SWITCHING 80V 200 2 6 00 35 DIODE SWITCHING 80V 200MA 2NS DO 35 DIODE SWITCHING 80
74. 0160 3934 5 2 CAPACITOR FXD 350PF 1 100VDC MICA 28480 0160 3934 5 15 0160 2055 9 CAPACITOR FXD 01UF 80 20 100VDC CER 28480 0160 2055 5 16 0160 2055 9 CAPACITOR FXD 010 80 20 100VDC CER 28480 0160 2055 5 17 0160 2055 9 CAPACITOR FXD 01UF 80 20 100VDC CER 28480 0160 2055 5 18 0150 2055 9 CAPACITOR FXD O1UF 480 209 100VDC 28480 0160 2055 5 19 0160 3934 5 CAPACITOR FXD 350PF 1 100VDC 28480 0160 3934 5 20 0150 4590 1 CAPACITOR FXD 18UF 1 200VDC 28480 0160 4590 5 21 0160 5032 8 CAPACITOR FXD 0223UF 1 200VDC 28480 0160 5032 5 22 0160 3293 9 CAPACITOR FXD 2470PF 1 100VDC 28480 0150 3293 5 23 0150 3874 2 1 CAPACITOR FXD 10PF 5 200VDC CER 28480 0160 3874 5 24 0160 0194 3 1 CAPACITOR FXD 0150 10 200VDC POLYE 28480 0160 0194 5 25 0160 2055 9 CAPACITOR FXD 01UF 80 20 100VDC CER 28480 0160 2055 5 26 0160 2055 9 CAPACITOR FXD O1UF 80 20 100VDC CER 28480 0160 2055 5 27 0160 4494 4 1 CAPACITOR FXD 5 200VDC CER 0 30 28430 0160 4494 5 28 0180 0197 8 13 CAPACITOR FXD 2 2UF 10 20VDC TA 56289 1500225 9020 2 5 29 0180 2141 5 1 CAPACITOR FXD 3 3UF 10 50VDC TA 56289 150D335X905082 A5C30 0180 0197 8 CAPACITOR FXD 2 2UF 10 20VDC 56289 1500225 9020 2 5 1 0180 0291 3 CAPACITOR FXD 1UF 10 35VDC 56289 150D105X9035A2 A5C32 0180 0291 3 CAPACITOR FXD 1UF 4 10 35VDC TA 56289 1500 105 9035 2 A5C33 0180 0197 8 CAPACITOR FXD 2 2UF
75. 0600 0 90 CONNECTOR SGL CONT PIN 1 14 5 52 SO 28480 1251 0600 A2TP2 1251 0600 0 CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ 28480 1251 0600 A2TP3 1251 0600 0 CONNECTOR SGL CONT 1 14 MM BSC SZ SQ 28480 1251 0600 2 4 1251 0600 0 CONNECTOR SGL CONT 1 14 MM BSC SZ SO 28480 1251 0600 2 5 1251 0600 0 CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ 28480 1251 0600 Refer to Section 7 for update information Factory Selected Component Refer to Section 5 A Errata part echange 6 14 rcv 6FEB90 Model 8908B Reference Designation A2TP6 A2TP7 201 202 A2US A2UA A2US A2U6 A2U7 A2U8 A2U9 A2U10 A2U11 A2U12 A2U13 A2U14 A2U15 A2U16 A2U17 A2U18 A2U19 A2U20 2 1 A2VR2 A2W1 A2W2 A2W3 A2WA 2 2 1 2 2 2 fRefer te Section 7 for update iuferuatien rev 16FEB90 HP Part Number 1251 0600 1251 0600 1826 0421 1826 0783 1826 0759 1826 0783 1826 0783 1826 0413 1826 0783 1826 1012 1826 1012 1826 0783 1820 1202 1820 2795 1826 0759 1826 0932 1826 0759 1826 0413 1902 0029 1902 0029 8159 0005 08903 60298 08903 60298 1251 6065 1251 6065 Qty Tuble 6 3 Replaceable Parts Description Mtr P Code CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ 28480 CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ 28480 CONV RMS DC 14 DIP C PKG 24355 NOT ASSIGNED IC OP AMP LOW NOISE 8 DIP C PKG 52063 COMPARATOR GP QUAD 14 0
76. 0811 3726 A6R72 R74 NOT ASSIGNED A6R75 0811 3720 8 2 RESISTOR 40 91 1 4W 26480 0811 3720 ABR 78 0811 3725 3 RESISTOR 10 10 1 4W 28480 0811 3725 AGR77 0811 3720 8 2 RESISTOR 40 91 1 4W 28480 0811 3720 A6R78 R81 NOT ASSIGNED A6F82 0757 0401 0 RESISTOR 100 1 125W F TC 0 100 24546 Ca t 8 TO 101 F A6R83 NOT ASSIGNED A6R84 0757 0401 0 RESISTOR 100 1 125W 0 100 24546 C4 1 8 T0 101 F 6 85 NOT ASSIGNED AGRB6 NOT ASSIGNED A6R87 0757 0464 5 RESISTOR 90 1 125W 0 100 24546 4 1 8 0 9092 6 88 0757 0442 9 RESISTOR 10K 1 125W 0 100 24545 4 1 8 0 1002 AGRB9 0757 0280 3 RESISTOR 1K 1 125W TC 04 100 24546 4 1 8 10 1001 A6R90 0698 8827 4 RESISTOR 1M 1 125W F 1 0 100 28480 0698 8827 2450A 28164 691 0757 0123 3 2 RESISTOR 34 8K 1 125W F 0 100 28480 0757 0123 2818A AND AGRI 0757 0199 3 RESISTOR 21 5 1 125W TC 0 100 24546 4 1 8 2152 AeR92 0698 8827 4 RESISTOR 1M 1 125W 0 100 28480 0698 8827 2450A TO 28916A AGR93 0757 0123 3 RESISTOR 34 8K 1 125W TC 0 100 28480 0757 0123 2818A AND ADOVE A693 0757 0199 3 RESISTOR 21 5K 1 125W TC 0 100 24546 4 1 8 2152 2450A 2816A AG6R 94 0757 0278 9 RESISTOR 1 78K 1 125W F 0 100 24546 4 1 8 70 1781 AG6R95 0757 0278 9 RESISTOR 1 78K 1 125 f 0 100 24546 4 1 8 0 1781 2818A AND ABOVE 694 0598 0085 RESISTOR 2 61K 1 125 0 100 24546 4 1
77. 1 125W TC 0 100 24546 RESISTOR 5 11K 1 125W F TC 0 100 24546 RESISTOR 5 11K 1 125W F TC 0 100 24546 RESISTOR 5 11K 1 125W TC 0 100 24546 RESISTOR 3 16M 1 125W 0 100 28480 RESISTOR 3 16 1 125W 0 100 28480 RESISTOR 5 11K 1 125W F 0 100 24546 RESISTOR 5 11K 1 125W 0 100 24546 RESISTOR 5 11 1 125W 0 100 24546 RESISTOR 5 11K 1 125W 0 100 24546 RESISTOR 100 5 25W FC 1C 400 500 01121 CONNECTOR SGL CONT PIN 1 14 MM 8SC SZ SQ 28480 CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SO 28480 CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SO 28480 CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ 28480 CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ 28480 CONNECTOR SGL CONT PIN 1 14 MM BSC S2 SQ 28480 IC GATE TTL LS NAND QUAD 2 INP 01295 COMPARATOR GP QUAD 14 DIP P PKG 01295 IC AMP GP QUAD 14 DIP C PKG 28480 IC CONV 8 B D A 16 DIP C PKG 04713 IC LCH TTL LS COM CLEAR 8 BIT 01295 IC LCH TTL LS COM CLEAR 8 BIT 01295 DCDR TTL LS 3 TO 8 LINE 3 INP 01295 IC GATE TTL LS EXCL OR QUAD 2 INP 01295 FF TTL LS D TYPE POS EDGE TRIG COM 01295 IC FF TTL LS D TYPE POS EDGE TRIG COM 01295 Factory Selected Component Refer ta Section 5 8903B Mfr Part Number 4040 0748 1480 0116 4040 0755 1480 0116 4 1 8 0 1002 208 472 4 1 8 0 4841 C4 1 8 TO 1003 F C4 1 8 10 1003 F 4 1 8 0 7501 4 1 8 0 7501 C4 1 8 T0 7501 F 4 1 8 0 7501 PME
78. 1 A1MP33 5041 0808 9 1 A1MP34 5041 1841 2 1 1 35 5041 1834 3 1 A1MP36 5041 1843 4 2 A1MP37 5041 1835 4 1 A1MP38 5041 0286 7 1 A1TMP39 5041 1843 4 A1MP40 5041 0508 6 1 A1MP41 5041 0319 7 1 AiR 1810 0402 5 11 AtRe 1810 0205 7 1 183 0698 3155 1 1 1 4 0757 0199 3 1 AIRS 1810 0207 9 1 195 1810 0208 0 1 A1R7 0757 0481 2 2 A1R8 0598 0082 7 1 A1R9 0698 3453 2 1 A1R10 0757 0461 2 A1R11 0757 0447 4 1 A1R12 0757 0438 3 1 A1R13 0098 3445 2 4 1814 2698 3445 2 A1R15 0698 3445 2 A1R16 0598 3445 2 1 17 1810 0229 5 1 A1R19 1810 0402 6 A1R20 1810 0402 6 A1R21 1810 0402 6 Yrtefey to Section 7 update informatia 6 6 Table 6 3 Replaceable Parts Mfr Description Coan KEY HALF GY LIT 28480 KEY HALF GY LIT 28480 KEY HALF FREQ 28480 KEY HALF SK GY 6 28480 KEY HALF SK GY 2 28480 KEY OTR EB BLK 28480 K H FREQ INCR 28480 K H STOP FREQ 28480 KEY HALF GY LIT 28480 KEY HALF SMK GY 28480 KEY HALF SK GY 6 28480 KEY HALF SK GY 5 28480 KEY HALF SK GY 1 28480 KEY QTR BLK SAT 28480 KEY HALF GY 28480 K H START FREO 28480 KEY HALF GY LIT 28480 KEY HALF SMK GY 28480 KEY HALF SK GY 8 28480 KEY HALF SK GY 4 28480 KEY HALF SK GY 0 28480 KEY HALF X10 GY 28480 KEY HALF GY DOT 28480 K H AMPTDANCR 28480 KEY HALF CLEAR 28480 K H ARROW 28480 KEY HALF 28480 KEY HALF GY LIT 28480 K H ARROW 28480 GR 28480 KEY CAP HALF GRAY LIT 28480 NETWORK RES 16 DIP330 0 OHM X 8 01121 NETWORK RES 8 SIP4 7K OHM X 7 01121 RE
79. 1 14 MM BSC SZ SO 28480 CONNECTOR SGL CONT PIN 1 14 MM BSC SZ 60 28480 CONNECTOR SGL CONT 1 14 MM BSC SZ SO 28480 CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SO 28480 CONNECTOR SGL CONT 1 14 MM BSC SZ SO 28480 CONNECTOR SGL CONT PIN 1 14 MM BSC S2 SQ 28480 CONNECTOR SGL CONT 1 14 MM BSC SZ SQ 28480 CONNECTOR SGL CONT PIN 1 14 MM BSC S2 SQ 28480 CONNECTOR SGL CONT 1 14 MM BSC SZ SQ 28480 CNTR TTL LS BIN ASYNCHRO 01295 IC CNTR TTL LS BIN ASYNCHRO 01295 GATE TTL LS AND QUAD 2 INP 01295 IC GATE TTL 16 NAND QUAD 2 INP 01295 IC F8 MPLI CLK FREQ 2 MHZ 28490 SOTKET IC 40 CONT DIP DI2 SLDR 28490 MEMORY INTERFACE 28480 SOCKET IC 40 CONT DIP DIP SLDR 28480 TTL LS QUAD 2 INP 01295 SOCKET IG 14 CONT DIP CIP SLOR 28480 Factory Selected C aupenent te Seetiou 7 Model 8903B Mfr Part Number 5082 4550 5082 4550 5082 4550 5082 4550 1200 0507 4040 0748 1380 0116 4040 0747 1430 0115 08903 00060 1854 0810 C4 1 B TO 101 F 1 8 TO 19GR F 1810 0055 1 8 10 1002 F 1 8 1002 C4 1 8 T0 1002 20654331 CA 8 TO 1002 F CA4 3 B TO 1002 F G4 1 8 Tn 1002 0410 TO 1092 F CA 1 8 TO 1002 F CA 1 8 10 5112 F 1251 0500 1251 0600 1251 0600 1251 0600 1251 0500 1251 0500 1251 0500 1251 0600 1251 0600 1251 0500 1251 0600 1251 0600 1251 0500 1251 0600 1251 0500 1251 0600 1251 0600 1251 0500 S
80. 111 Model 8903 Instrument Changes Section 7 INSTRUMENT CHANGES 7 1 INTRODUCTION TO THIS SECTION This section contains instrument modification recommendations and procedures that could improve the performance and reliability of your instrument Refer to Instrument Covered by This Manual paragraphs 1 through 4 in Section 1 for important information about serial number coverage 7 2 MODIFICATIONS CHANGES Description Instruments with Serial Prefix 2450A have System II cabinet parts and hardware that are English thread Instruments with Serial Prefix 2520A and higher have System II cabinet parts and hardware that are METRIC thread In Section 6 Replaceable Parts both English and Metric thread part numbers are listed The correct part numbers are referenced to the instrument s serial number prefix 7 3 FIRMWARE CHANGE SUMMARY The firmware is changed whenever anomalies are found in the instrument s operation which can be corrected by altering the Controller s program Firmware is also changed to add new features which may be only changed in the program or which may also result from instrument hardware changes Since the program resides in the ROMs the firmware the ROMs are altered each time the program is changed At that time the new ROMs are given new part numbers and the software the program date is changed To display the software date key in Special Function 42 0 Always update firmware with the latest edition wh
81. 141 IN ID 28480 2190 0918 92 1826 0169 5 1 IC V RGLTR 27014 LM320K 15 08640 20057 5 INSULATOR SPACER 28480 08640 20057 1200 0043 8 INSULATOR XSTR ALUMINUM 28480 1200 0043 0624 0459 7 SCREW TPG 6 20 75 IN LG PAN HD POZI STL 00000 ORDER BY DESCRIPTION 2190 0918 4 WASHER LK HLCL NO 6 141 IN ID 28480 2190 0918 A Errata part change rev 20JUN91 Model 8908 Reference C Qty Designation Number D W1 08903 60197 6 1 w2 08903 60045 3 1 w3 08903 60198 7 4 wa 08903 60047 5 1 w5 08903 60028 2 1 owe 08903 60029 1 08903 20055 1 0837 0365 6 1 0960 0443 1 1 W7 8120 1378 1 1 2450A 2520A we 08903 60176 1 2520A AND ABOVE Ws Refer fir Section 7 der e iuforuatien rev 16FER90 HP Part Table 6 3 Replaceable Parts Description CABLE ASSEMBLY FRONT OUTPUT EXCEPT CABLE ASSEMBLY FRONT INPUT EXCEPT CABLE ASSEMBLY REAR OUTPUT OPTION 001 CABLE ASSEMBLY REAR INPUT OPTION 001 RIBBON CABLE ASSEMBLY A13J1 TO A1J1 CABLE ASSEMBLY POWER S1 TO A14 NUT SPECIAL M2 5 PART OF W6 THERMISTOR SURGE PTCTR 5 25deg c PART OF 6 LINE MODULE FILTERED LINE POWER CORD GROUND CABLE 54 Tt TO CHASSIS NOT ASSIGNED Mfr Code 28480 28480 28480 28480 28480 28480 28480 04379 28480 28480 28480 Daetory Selected Component Refer ta Section 5 Replaceable Parts Mfr Part Number 08903 60197 08903 60045 08903 60198 08903 60047 08903 60028 08903 60029 08903 20055
82. 1UF 10 SOVDC CAPACITOR FXD 0223UF 1 200VDC C MPC 3000P 50V CAPACITOR FXD 1UF 1 160VDC MET POLYC C MPC 958P 50V CAPACITOR FXD 0223UF 1 200VDC CAPACITOR FXD 0223UF 1 200VDC CAPACITOR FXD 02UF 200VDC CAPACITOR FXD 02UF 200VDC CONNECTOR 10 PIN F POST TYPE RESISTOR 21 5 1 05W F TC 20 100 RESISTOR 21 5 1 05W F 0 100 RESISTOR 12 5K 1 125W F 0 25 RESISTOR 34 8 1 05W F 0 100 RESISTOR 1 47 1 05W TC 0 100 RESISTOR TRMR 500 10 SIDE ADJ 1 TRN RESISTOR 1 96 1 05W F 0 100 RESISTOR 3 01K 1 125W TC 0 100 RESISTOR 7 15K 1 125W TC 0 100 RESISTOR 3 01K 1 125W F TCzO 4 100 RESISTOR 825 1 05W F TC 0 100 RESISTOR 9 53 1 e 125W F TC 0 100 RESISTOR 19 6K 1 05W F TC 0 100 RESISTOR 33 2K 1 125W TC 0 100 IC LOW BIAS H IMPD QUAD 14 DIP P Mfr Code 28480 28480 25088 25088 28480 28480 28480 28480 28480 28480 28480 28480 28480 24546 24546 19701 24546 24546 28480 24546 24546 24546 24546 24546 24546 24546 24546 01295 Factory Selected Component Refer 10 Seetion 5 Replaceable Parts Mfr Part Number 08903 60127 08903 60127 D1ROGS1ASOK D1ROGS1ASOK 0160 5032 0160 6322 0160 4622 0160 6321 0160 5032 0160 5032 0160 6606 0160 5506 1251 6063 C3 1 8 TO 21R5 F C3 1 8 TO 21R5 F 4 1 8 79 1252 C3 1 8 TO 3482 F C3 1 8 TO 147 1 F 2100 3351 3 1 8 0 1961
83. 2 5K 1 125W F TCe0 4 25 28480 0698 6631 A4R111 0698 6631 4 RESISTOR 2 5K 1 125W 0 25 28480 0696 6631 A4R112 0757 0279 0 RESISTOR 3 16 1 125W F TC 0 100 24546 4 1 8 0 3161 44 113 0757 0470 3 RESISTOR 162K 1 125W 0 100 24546 4 1 8 0 1623 A4R114 0757 0279 0 RESISTOR 3 16 1 125W TC 0 100 24546 4 1 8 0 3161 A4R115 0757 0279 0 RESISTOR 3 16K 1 125W 0 100 24546 4 1 8 0 3161 4 116 0757 0442 9 RESISTOR 10K 1 125W 0 100 24546 4 1 8 0 1002 A4R117 0757 0279 0 RESISTOR 3 16K 1 125W F TC 0 100 24546 4 1 8 0 3161 448118 0757 0290 5 RESISTOR 6 19K 1 125W F TCzO 4 100 19701 MF4C 1 8 T0 6191 F A4R119 0757 0421 4 1 RESISTOR 825 t 125W TC 04 100 24546 C4 1 8 T0 825R F A4R120 0698 3443 0 1 RESISTOR 287 1 125W 0 100 24546 C4 1 8 TO 287R F A4R121 0757 0290 5 RESISTOR 6 19K 1 125W F 0 100 19701 MF4C1 8 T0 6191 F A4R122 0757 0422 5 RESISTOR 909 1 125W F TC 0 100 24546 C4 1 8 T0 909R F A4R123 0698 3441 8 1 RESISTOR 215 1 125W 0 100 24546 C4 1 8 T0 215R F 4 124 0698 0082 7 1 RESISTOR 464 1 125W F TC 0 100 24546 4 1 8 0 4640 A4R125 2100 3103 6 2 RESISTOR TRMR 10K 10 C SIDE ADJ 17 TRN 02111 43P103 A4R126 0757 0442 9 RESISTOR 10K 1 125W TC 0 100 24546 4 1 8 0 1002 A4R127 0699 0239 8 1 RESISTOR 59K 1 1W F TCzO 4 15 28480 0699 0239 A4R128 0698 3150 6 RESISTOR 2 37K 1 125W TC 0 100 24546 4 1 8 0 2371
84. 2001A AND AGCh15 1901 0880 7 AGCHR16 1901 0880 7 AICR 1901 0880 7 1901 0880 7 A6CR19 1901 0179 7 6 20 1901 0179 7 6 21 1901 0179 7 A6CT22 1901 0179 7 ABCR23 1902 0627 2 4 A6CR24 1902 0627 2 A6CR25 1902 0627 2 6 26 1902 0627 2 AGCR27 1901 0050 3 A6K1 0490 1190 0 2 6 2 0490 1501 7 2 0490 1501 7 2 A6K4 0490 1190 0 A6L1 9140 0210 1 A6L2 9140 0210 1 A6L3 A6L4 615 9149 0210 1 1 4040 0748 3 1480 0116 8 A6MP2 4040 0754 1 1 1480 0116 8 6 1 1854 0637 1 2 0340 0834 0 4 1205 0095 0 4 6 2 1853 0314 9 2 0340 0834 0 1205 0095 0 Refer to Section 7 for npilate information 6 60 Table 6 3 Replaceable Parts Mfr Description Code DIODE GEN PRP 125MA DO 35 03406 DIODE GEN PRP 125 00 35 03406 DIODE HV RECT 600V 1A 28480 DIODE HV RECT 600V 1A 28480 DIODE HV RECT 600V 1A 28480 DIODE HV RECT 600V 1A 28480 DIODE SWITCHING 80V 200MA 2NS DO 35 28480 DIODE SWITCHING 80V 200MA 2NS DO 35 28480 DIODE SWITCHING 80V 200MA 2NS DO 35 28480 DIODE GEN PRP 35V 50MA DO 35 28480 DIODE GEN PRP 35V 50MA DO 35 28480 DIODE GEN PRP 35V 50MA DO 35 28480 DIODE GEN PRP 35V 50MA DO 35 28480 DIODE GEN PRP 35V 50MA DO 35 28480 DIODE GEN PRP 35V 50MA 00 35 28480 DIODE GEN PRP 35V 50MA 00 35 28480 DIODE GEN PRP 35V 50MA DO 35 28480 DIOME GEN 125 DO 35 28480 DIODE GEN PRP 125MA DO 35 28480 DIODE GEN PRP 125MA DO 35 28480 DIODE GEN PRP 125 00 35 28480
85. 28480 IC COMPARATOR GP QUAD 14 DIP P PKG 01295 IC COMPARATOR GP QUAD 14 DIP P PKG 01295 IC COMPARATOR GP QUAD 14 DIP P PKG 01295 IC CONV RMS DC 14 DIP C PKG 24355 IC OP AMP H SLEW RATE DUAL 8 DIP P PKG 02037 IC SWITCH ANLG DUAL 16 DIP C PKG 32293 Factery Selected Component Refer to Section 5 Mode 8903B Mfr Part Number 1826 0562 HA2 2625 B0593 LM393N 08903 80041 LM339N XRS5534ACN XRS5534ACN 1826 0662 LM339N LM339N LM339N ADS36AJ MC34082P IH5043CDE A Errata part change rev 16FEB90 Model 8903B Reference Designation 4 4 4 1 4 2 A4C3 4 4 4 5 ASCE A4C7 4 8 4 9 4 10 4 11 4 12 4 13 A4C14 A4C15 4 16 4 17 4 18 4 19 4 20 4 21 4 22 4 23 4 24 4 25 4 26 4 27 4 28 4 29 4 30 4 31 A4C32 A4C33 4 34 4 35 4 36 A4C37 4 38 A4C39 4 40 4 41 4 42 4 43 4 44 4 45 Number 08903 60128 0180 2207 0180 0100 0180 0374 0180 0100 0180 0291 0180 0291 0180 0291 0180 0291 0160 4805 0160 2235 0180 0374 0160 4813 0150 5875 0160 540 0160 0336 0160 4679 0160 4456 0160 0335 0160 3046 0160 4426 0160 3324 0160 4 93 0160 3324 0160 3799 0180 2206 0180 0229 0160 3324 0160 4805 0160 4805 0160 4835 0160 4835 0160 4382 0160 4790 0180 2205 016 4835 0160 4835 0160 223 0180 2207 0160 4805 0160 4793 0160 48
86. 2948A and all MAJOR changes that apply to your instrument rev 20JUN91I For additional important information about serial numbers refer to INSTRUMENTS COVERED BY THIS MANUAL in Section 1 Fifth Edition This material may be reproduced by or for the U S Government pursuant to the Copyright License un der the clause at DFARS 52 227 7013 APR 1988 Copyright OHEWLETT PACKARD COMPANY 1985 EAST 24001 MISSION AVENUE TAF C 34 SPOKANE WASHINGTON U S A 99220 Service Manual Volume 1 2 HP Part 08903 90062 Other Documents Available Operation and Calibration Manual Volume 1 HP Part 08903 90079 Microfiche Operation and Calibration and Service Manual HP Part 08903 90080 Printed in U S A July 1993 HEWLETT PACKARD 1 Regulatory Information Updated March 1999 Regulatory Information Updated March 1999 Safety Considerations GENERAL This product and related documentation must be reviewed for familiarization with safety markings and instructions before operation This product has been designed and tested accordance with Publication 1010 Safety Requirements for Electronic Measuring Apparatus and has been supplied in safe condition This instruction documentation contains information and warnings which must be followed by the user to ensure safe operation and to maintain the product in a safe condition SAFETY EARTH GROUND A uninterruptible safety earth ground must be provided from the main
87. 30 CAPACITOR FXD 1UF 10 SOVDC CER CAPACITOR FXD 1UF 10 SOVDC CER CAPACITOR FXO 3 3PF 25PF 200VDC CER NOT NORMALLY LOADED SEE SECTION 5 TABLE 5 1 CAPACITOR FXD 2 2PF 25PF 100VDC CER 10 6VDC CAPACITOR FXD 1UF 10 SOVDC CER CAFACITOR FXD 1UF 10 SOVDC CER CAPACITOR FXD 1PF 25 500VDC CER CAPACITOR FXD 100UF 10 10VDC TA CAPACITOR FXD 47PF 5 100VDC CER 0 30 CAFACITOR FXD 6 8PF 5 100VDC CER CAPACITOR FXD 150PF 5 100VDC CER CAPACITOR FXD 330PF 5 100VDC CER CAPACITOR FXD 1UF 10 50VDC CER CAPACITOR FXD 1UF 4 109 SOVDC CER CAPACITOR FXD 1UF 10 35VDC Mfr Code 08903 60128 SERIAL PREFIX 2450A TO 2720A HP8903B 28480 56289 56289 55289 56289 56289 56289 56289 56209 28480 28480 56289 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 26480 28480 56289 56289 28460 28480 28480 28480 28480 28480 56289 28480 28480 28480 56289 28480 28480 28480 28480 28480 28480 56289 Selected Component Refor ta Section 5 Replaceable Parts Mfr Part Number 08903 60128 150D107X9010R2 150D475X9035B2 150D106X9020B2 150D475X903582 1502105 9035 2 15042105 9035 2 150D105X9035A2 150D105X9035A2 0160 4805 0160 2236 150D106X9020B 2 0160 4843 0160 5876 0160 5409 0160 0335 0160 4679 0160 4456 0160 0335 0160 3045 0160 4455 0160 3324 0
88. 390 PF PINS 2 8480 1810 0285 ABRA4 0757 0442 9 RESISTOR 10K 1 125W TC 20 100 24545 C4 1 8 10 1002 F AB8RS 0757 0442 9 RESISTOR 10K 1 125W F TC 0 100 24546 4 1 8 10 1002 A8R6 0757 0442 9 RESISTOR 10K 1 125W F TC 0 100 24546 4 1 8 10 1002 NOT ASSIGNED 0757 0442 9 RESISTOR 10K 1 125W TC 0 100 24546 1 8 0 1002 F A8Re 0757 0442 9 RESISTOR 10K 1 125W 0 100 24546 4 1 8 0 1002 ABR10 0757 0442 o RESISTOR 10K 1 125W 0 100 24546 C4 1 8 T0 1002 F ABR11 0757 0442 9 RESISTOR 10K 1 125W TC 0 100 24546 4 1 6 10 1002 A8R12 0757 0442 3 RESISTOR 10K 1 125W TC 0 100 24546 4 1 8 10 1002 ABR13 0757 0458 7 RESISTOR 51 1K 1 125W F TC 0 100 24546 1 8 0 5112 1 1251 5039 CONNECTOR SGL CONT PIN 1 14MM BSC SZ SO 22526 65500 118 2 NOT ASSIGNED ABTP3 NOT ASSIGNED 4 NO ASSIGNED 5 ASSIGNED A8TP6 NOT ASSIGNED ABTP7 NOT ASSIGNED NOT ASSIGNED ABTP9 ASSIGNED 10 NOT ASSIGNED ABTP11 NOT ASSIGNED 12 NOT ASSIGNED NOT ASSIGNED ABTP14 NOT ASSIGNED ABTP15 NOT ASSIGNED A8TP16 NOT ASSIGNED ASTP17 NOT ASSIGNED ABTP18 NOT ASSIGNED Refer te Section 7 for npilate information Factory Selected Component Eefer lo Section Errata port change 6 74 rev 6 Replaceable Parts 3903B Table 6 3 Replaceable Parts Reference HP Part Des Mfr cr
89. 4832 0160 4832 0160 4832 0160 4832 0160 4590 0160 5032 0160 3293 0160 3918 0160 4795 0160 4832 0160 4832 0160 4795 0160 4832 0160 4832 0160 4791 0160 4832 0160 4832 0160 4590 0160 5032 0160 3293 0160 3918 150D106X9020B2 30D107G025DD2 0160 4832 0160 4832 0160 4832 0160 4832 0160 4814 0160 4795 0160 4832 0160 4832 0160 4807 0160 4807 0160 5550 0160 5527 0160 4832 0160 4832 0160 3510 A Errata part change 6 29 Replaceable Parts Reference HP Part Designation Number A3C46 0160 4233 A3C47 0160 3531 0160 5528 49 0160 4832 A3C50 0160 4832 A3C51 52 0160 4832 A3C53 0160 4832 A3C54 0160 4835 55 0160 4835 56 0160 0577 57 0160 4832 58 0160 4832 59 0150 5559 1 1901 0033 A3CR2 1901 0033 A3CR3 1901 0050 A3CR4 1901 0050 A3CRS 1901 0050 A3CR6 1901 0050 A3CR7 1901 0050 8 1901 0050 A3CRS 10 11 1901 0050 A3CR12 1901 0050 1 1901 0050 14 1991 0050 A3CR15 1901 0518 A3CR16 1901 0518 A3L1 9140 0114 A3L2 9100 2430 A3MP1 4040 0748 1480 0116 2 4040 0751 1480 0115 0403 0026 A3Q1 1855 0414 2 1855 0414 1855 0414 4 1855 0420 5 1855 0420 A3Q6 1855 0414 A3Q7 1855 0414 1855 0414 A3Q9 1855 0414 A3Q10 1855 0414 A3Q11 1855 0420 NNDDD b oO amp b gt G Ww WwW Ww Q lt nm 5
90. 5 0160 4832 4 58 CAPACITOR FXD 01UF 10 100VDC CER 28480 0160 4832 2 6 0160 4786 7 5 CAPACITOR FXD 27PF 5 100VOC CER 0 30 28480 0180 4786 2 7 0160 2237 9 2 CAPACITOR FXD 1 2 25PF 500VDC CER 28480 0160 2237 2 8 0160 4601 7 CAPACITOR FXD 100PF 5 100VDC CER 28480 0160 4801 A2C10 0121 0422 8 CAPACITOR V TRMR PSTN 8 4 5PF 1250 18736 TPSG 0340 0669 9 INSULATOR XSTR SLBL ORG POLYM 28480 0340 0669 2 11 0160 4786 7 CAPACITOR FXD 27PF 5 100VDC CER 0 30 28490 0160 4786 A2C12 0160 2236 8 4 CAPACITOR FXD 1PF 25PF 500VDC CER 28480 0160 2236 A2C13 0180 0228 6 4 CAPACITOR FXD 22UF 10 15VDC 56289 1500226 901582 2 14 0160 4835 7 36 CAPACITOR FXD 1UF 10 50VDC CER 28480 0160 4835 A2C15 0160 4832 4 CAPACITOR FXD 01UF 10 100VDC CER 28480 0160 4832 A2C16 0160 4832 4 CAPACITOR FXD 01UF 10 100VDC CER 28480 0160 4832 A2C17 0180 2195 0 2 CAPACTIOR FXD 15UF 10 35VDC 56289 150D156X9035R2 A2C18 0160 5549 2 2 CAPACITOR FXD 068UF 5 100VDC 28480 0160 5549 2 19 0160 4832 4 CAPACITOR FXD 01UF 10 100VDC CER 28480 0160 4832 2 20 0160 4832 4 CAPACITOR FXD 01UF 10 100VDC CER 28480 0160 4832 2 21 0160 4832 4 CAPACITOR FXD 01UF 10 100VDC CER 28480 0160 4832 A2C22 0160 4835 7 CAPACITOR FXD 1UF 10 5OVDC CER 28480 0160 4835 A2C23 0160 4835 7 CAPACITOR FXD 1UF 10 50 0 CER 28480 0160 4835 2 24 ASSIGNED 2 25 0160 4801 7 CAPACITOR FXD 100PF 5 100VDC CER 28490 0150 4801 A2C26 01
91. 6 98 1 125W 0 100 24545 4 1 8 0 6081 4 25 0698 3151 7 6 RESISTOR 2 87K 1 125W 0 100 24546 4 1 8 10 2871 A4R26 0757 0447 4 RESISTOR 16 2K 1 125W TC 0 100 24546 C4 1 8 TO 1622 A4R27 0698 3151 7 RESISTOR 2 87 1 125W F TC 0 100 24546 4 1 8 0 2871 4 28 0757 0439 4 RESISTOR 6 81K 1 125W 0 100 24546 C4 1 8 TO 681 t F A4R29 0698 6631 4 RESISTOR 2 5K 1 125W TC x0 4 25 28480 0698 6531 A4R30 0698 6631 4 RESISTOR 2 5K 1 125W 0 25 28480 0698 6531 A4R31 0757 0199 3 1 RESISTOR 21 5K 1 125W TC 0 4 100 24546 4 1 8 0 2152 A4R32 0757 0280 3 RESISTOR 1K 1 125W TC 0 100 24546 C4 1 8 T0 1001 F 4833 0757 0422 5 RESISTOR 909 1 125W F 1C 0 100 24545 C4 1 8 TO 909R F A4F34 0698 6343 5 RESISTOR OK 1 125W F TC 0 25 28480 0698 6343 A4R35 0698 6362 8 RESISTOR 1K 1 125W 0 25 28480 0698 6362 4836 0757 0447 4 RESISTOR 16 2K 1 125W 0 100 24546 4 1 8 0 1622 A4R37 0757 0447 4 RESISTOR 16 2K 1 125W 0 100 24545 4 1 8 0 1622 A4R38 0598 3151 7 RESISTOR 2 87K 1 125W 0 100 24545 C4 1 8 TO 287 1 F A4R39 0757 0447 4 RESISTOR 16 2K 1 125 0 100 24546 C4 1 9 TO 1622 F A4R40 0698 3151 7 RESISTOR 2 87K 19e 125W F TC 0 100 24546 C4 1 8 T0 2871 F A4R41 0757 0470 3 4 RESISTOR 162K 1 125W F TC 04 100 24546 4 1 8 0 1623 A4H42 0698 3151 2 RESISTOR 2 87K 1 125W F 0 100 24546 C4 1 8 TO 287 t F A4R43 075
92. 62K 1 125W TC 0 100 24546 4 1 8 0 5621 A2A R10 0698 3515 7 RESISTOR 5 9K 1 125W 1C 204 100 24546 C4 1 8 T0 5901 F A2A 11 0698 7240 3 RESISTOR 1 47K 1 05W TC 04 100 24546 3 1 8 0 4471 A2A R12 0698 8607 E 1 RESISTOR 4 5K 1 125W F 0 25 28480 0698 8507 A2A R13 0698 7270 9 2 RESISTOR 26 1K 1 05W TC 04 100 24546 C3 1 8 TO 2612 F A2A R14 0698 4508 0 1 RESISTOR 78 7K 1 125W 0 100 24546 C4 1 8 TO 7872 F A2A R15 0699 4489 6 1 RESISTOR 28K 1 125W TC 204 100 24546 C4 1 8 T0 2802 F A2A R16 0698 7254 9 RESISTOR 5 52 1 05W 0 100 24546 3 1 8 0 5621 A2A R17 0698 7195 8 RESISTOR 21 5 1 05W F 0 100 24546 C3 1 8 TO 21R5 F A2A R18 0693 7196 8 RESISTOR 21 5 1 05W 1C 0 100 24546 C3 1 8 TO 21RS F 2 1 1 1826 1290 5 LOW BIAS H IMCD QUAD 14 DIP P 01295 TL7L04C40 Refer te Section vi for mformation Pactory Selected e Errata part change reu 16FEB90 6 19 Model 8903 Replaceable Parts Tuble 6 3 Replaceable Parts Reference HP Part Mfr j escription Mfr Part Number Designation Number D ty P Code A2A1 08903 60126 1 1 CCIR WEIGHTING FILTER 28480 08903 60126 OPTION 012 ONLY OR A2A2 08903 60126 1 1 CCIR WEIGHTING FILTER 28480 08903 60126 OPTION 052 ONLY A2A C1 0180 2661 5 CAPACITOR FXD 1UF 10 SOVDC TA 25088 D1R0GS1A50K A2A_C2 0180 2661 5 CAPACITOR FXD 1UF 10 SOVDC
93. 7 A4C17 0160 4456 8 4 18 0160 0336 5 4 19 0160 3045 0 4 20 0150 4456 8 4 21 0160 3324 7 4 22 0160 4793 6 4 23 0160 3324 7 4 24 0160 4799 2 4 25 0180 2205 4 4 26 0180 0229 7 4 27 0160 3324 7 4 28 0160 4805 1 4 29 0160 4805 1 A4C30 0160 4835 7 A4C31 0160 4835 7 A4C32 0160 4382 9 A4C33 0160 4799 2 4 34 0180 2206 4 4 35 0160 4835 7 4 36 0160 4835 7 4 37 0160 2236 B 4 38 0180 2207 5 A4C39 0160 4805 1 4 40 0160 4793 5 Refer to Section 7 for update information rev 16FEB90 OUTPUT AMPLIFIER VOLTMETER ASSEMBLY 28480 OUTPUT AMPLIFIERAOLTMETER ASSSEMBLY 28480 THIS IS AN EQUIVALENT TO THE 08903 60283 EXCEPT FOR THE POSTION OF W1 REFER TO THE PARTIAL SCHEMATIC THE 08903 60282 IS A DIRECT REPLACEMENT FOR THE 08903 60128 CAPACITOR F XD 100UF 10 10VDC TA 56289 CAPACITOR FXI 4 7UF 10 35VDC 56289 CAPACITOR FXD 10UF 10 20VDC 56289 CAPACITOR FXD 4 7UF 10 35VDC 56289 CAPACITOR FXD 1UF 10 35VDC 56289 CAPACITOR FXD 1UF 10 295VDC TA 55289 CAPACITOR FXD 1UF 10 35VDC 56289 CAPACITOF FXD 10 10 35VDC 56289 CAPACITOR FXD 47PF 5 100VDC CER 04 30 28480 CAPACITOR FXD 1PF 25 500VDC CER 28480 CAPACITOR FXD 10UF 10 20VDC TA 56289 CAPACITOR FXD 47UF 80 20 5OVDC CER 28480 CAPACITOR FXD 1300PF 1 CER 28480 CAPACITOR FXD 3000PF 5 SOVDC CER 28480 CAPACITOR FXD 100PF 1 300VDC MICA 28480 CAPACITOR FXD 270PF 1
94. 8 2611 AGRIS 0698 0085 0 RESISTOR 2 61K 1 125 0 109 24546 4 1 6 2611 AGRI96 0757 0394 0 RESISTOR 51 1 1 125W F 0 100 24546 C4 1 8 T0 51R1 F AGR97 0757 0394 0 RESISTOR 51 1 1 125W 0 100 24546 4 1 8 70 5181 AGR98 0757 0442 9 RESISTOR 10K 1 125W TC x 0 100 24546 C4 1 8 TO 1002 F 6 99 0698 8821 8 4 RESISTOR 5 62 1 125W F TC 0 100 28480 0698 8821 A6R100 0698 8621 8 RESISTOR 5 62 1 125 F TC 0 100 28480 0698 882 1 AGR101 0696 8821 8 RESISTOR 5 62 1 125W 0 100 28480 0698 8821 ABR102 0698 8821 8 RESISTOR 5 62 1 125 TC 04 100 28480 0698 8821 A6R103 0699 1727 1 1 RESISTOR 550 1 25W 28480 0699 1727 A6TP1 1251 0600 CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SO 28480 1251 0600 6 2 1251 0600 0 CONNECTOR SGL CONT PIN 1 14 MM 8SC SZ 50 28480 1251 0600 AGTP3 1251 0600 0 CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SO 28480 1251 0600 AGTP4 1251 0600 Q CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SO 28480 1251 0600 6 5 1251 0500 0 CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ 28480 1251 0600 Refer to Section 7 for update information Factory Selected Component Refer ta Section 5 A Errata part change rev IGFEB90 Model 8903 Reference HP Part Designation Number D ASTPE 1251 0600 0 A6TP7 1251 0600 0 AGUT 1826 0783 9 61 2 1826 0783 9 6 3 1826 0783 9 A6U4 1820 0535 7 ABUS 1826 0606 5 AGUS 1826 0783 9 1826 0180 0 AGUB 1826 0759 9 AG6U9 1826 0783 9 A8U10 1826 0
95. 8903B Replaceable Parts Table 6 3 Replaceable Parts Reference HP Part Mfr ty Description Mtr Part Number Designation Number D y P Code A4CR10 1901 0518 8 DIODE SM SIG SCHOTTKY 28480 1901 0518 A4CR11 1901 0518 8 DIODE SM SIG SCHOTTKY 28480 1901 0518 AACRI2 1901 0040 1 DIODE SWITCHING 30V 2NS 00 35 28480 1901 0040 2450A TO 2520A A4CRI3 1901 0376 6 DIODE GEN PRP 35V 50MA DO 35 28480 1901 0376 2601 AND ABOVE A4CRI3 1901 0050 3 DIODE SWITCHING 80V 200MA 2NS DO 35 28480 1901 0050 A4CR14 1901 0040 1 DIODE SWITCHING 30V 50MA 2NS 00 35 28480 1901 0040 AACR15 1901 0040 1 DIODE SWITCHING 30V 50MA 2NS 00 35 28480 1901 0040 2450 TO 2520 4 16 1901 0376 6 DIODE GEN PRP 35V 50 00 35 28480 1901 0376 A2CR17 1901 0376 6 DIODE GEN PRP 35V 50MA DO 35 28480 1901 0376 A4CRI8 1901 0376 8 DIODE GEN PRP 35V 50MA DO 35 28480 1901 0376 A4CR19 1901 0376 6 DIODE GEN PHP 35V 50MA DO 35 28480 1901 0376 A4CR20 1901 0376 6 DIODE GEN PRP 35V 50MA DO 35 28480 1901 0376 A4CR21 1901 0376 6 DIODE GEN PHP 35V 50MA DO 35 28480 1901 0376 A4CR22 1901 0376 6 DIODE GEN PRP 35V 50MA DO 35 28480 1901 0376 A4CR23 1901 0376 6 DIODE GEN PRP 35V 50MA DO 35 28480 1901 0376 A4CR24 1901 0376 6 DIODE GEN PRP 35V 50MA DO 35 28480 1901 0376 2601 AND ABOVE A4CR16 1901 0050 3 DIODE SWITCHING 80V 200MA 2NS DO 35 28480 1901 0050 A4CR17 1901 0880 7 DIODE GEN PRP 125 DO 35 28480 1901 0880 A4CR18 1901 0880 7 DIODE GEN PRP 125 DO 35 28480 1901 0880 A4CRIS 1901 088
96. A7R18 0757 0430 3 7 19 0757 0438 3 A7R20 0757 0438 3 A7R21 0757 0438 3 A7F22 0699 0070 5 A7Re3 0699 0070 5 7 24 0757 0438 3 A7R25 0757 0438 3 A7R26 0757 0438 3 A7R27 0757 0438 3 A7R28 0683 1015 7 7 1 1251 0600 0 7 2 1251 0600 0 7 1251 0600 0 7 4 1251 0600 0 A7TP5 1251 0600 0 A7TP6 1251 0600 0 A7U1 1820 1197 9 A7U2 1826 0138 8 A7U3 1826 0323 3 A7U4 1826 0188 8 705 1820 1729 3 A7U6 1820 1729 3 A7U7 1820 1216 3 A7U8 1820 1211 8 A7U9 1820 1195 7 A7U10 1820 1195 7 tHRefer ta Section 7 for update information 6 66 Table 6 3 Replaceable Parts Description Mtr P Code EXTR PC BD BLK POLYC 062 BD THKNS 28480 PIN GRV 062 IN DIA 25 IN LG STL 28480 EXTR PC BD VIO POLYC 062 BD THKNS 28480 PIN GRV 062 IN DIA 25 IN LG STL 28480 NOT ASSIGNED RESISTOR 10K 1 125W 0 100 24546 NETWORK RES 8 SIP4 7K OHM X 7 01121 NOT ASSIGNED RESISTOR 4 64K 1 125W TC 204 100 24546 RESISTOR 100K 1 125W TC 0 100 24548 RESISTOR 100K 1 125W F TC z0 100 24546 RESISTOR 7 5K 196 125W TC 04 100 24546 RESISTOR 7 5K 1 125W TC 0 100 24546 RESISTOR 7 5K 1 125W TC 0 100 24546 RESISTOR 7 5K 1 125W TC 0 100 24546 RESISTOR 5K 1 125W TC 0 100 03888 RESISTOR SK 1 125W 0 100 03888 RESISTOR 19 6K 1 125W 0 100 24546 RESISTOR 1K 10 125W CC TC 2 330 800 01121 RESISTOR 1K 10 125W CC TC 330 800 01121 RESISTOR 5 11K 1 125W 0 100 24546 RESISTOR 5 11K
97. AD 2 522 13 AMPLIFIER TO OUTPUT VOLTMETER 551 Figure 103 8 103 Service Model 89038 Component Coordinates NOTES 1 Whenever an option plug in fiter is not installed there is a jump er wire connecting pins 7 and 9 on the filter plug in connectors The front panel is labled to the effect that on the standard instru ment there are no filters installed Input Amplifiers SS 1 0FST LOW LOW LOW HIGH HIGH HIGH 4 2 CW TPS CM 7 12dB 4098 244 2498 4048 1248 e e C38 8125 51 TE R103 gt E Ez E 78 MP1 BLACK MP2 RED i E E QU g C110 o C109 E E u20 5 es MI g m Oo cg2 C40 N E 5 else D ge O cgo ojm BE o m ehe lt aeo D on O r r gt hol Rol c c was eee REEL mi J By EN Benes XA2A1 XAZA2 m SERIE SS a UiB T B M 119 cC c C88 C2 ljg CR35 lt if oe Rie R50 R37 R41 25_ R28 C96 R115 C1B 000000000000000 2000000001000000000000 914 c 104 2 Figure 8 104 SERVICE SHEET 2 INFORMATION Component Locator P O A2 SEE REVERSE SIDE nput Circuits Schematic General Information 8B 104 Model 8903
98. AIDS20 NOT ASSIGNED 27244 AND ABOVE A1DS20 1990 0719 8 LED LAMP LUM INT 1MCD IF 20MA MAX BVR 5V 24840 1990 0719 0380 1231 7 3 SPACER RND 365 IN LG 12 IN ID 00000 ORDER BY DESCRIPTION A1J1 1251 4736 1 1 CONNECTOR 26 PIN M RECTANGULAR 28480 1251 4736 A1MP1 5041 0319 7 6 KEY HALF GY LIT 28480 5041 0319 A1MP2 5041 1832 1 1 KEY HALF HZ MV 28480 5041 1832 A1MP3 5041 0319 7 KEY HALF GY LIT 28480 5041 0319 1 4 5041 0385 7 3 KEY HALF SMK GY 28480 5041 0385 1 5 6041 1832 8 1 KEY HALF AMPTD 28480 5041 1839 1 6 5041 0817 0 1 KEY HALF SK GY 7 28480 5041 0817 1 7 5041 0813 6 1 KEY HALF SK GY 3 28480 5041 0813 A1MP8 5041 1665 8 1 KEV QUARTER LCL 28480 5041 1665 A1MP9 5041 1842 3 1 K H PLOT LIMIT 28480 5041 1842 1 10 5041 1831 0 1 KEY HALF KHZ V 28480 5041 1831 Refer t Section 7 fov information Factory Selected Component Refer ta Section 4 Errata part chance rcv 16FED90 Ge 5 Replaceable Parts Reference HP Part Qty Designation Number D AT1MP11 5041 0319 7 A1MP12 5041 0319 7 13 5041 1838 7 1 1 14 5041 0816 9 2 A1MP15 5041 0812 5 1 A1MP16 5041 0408 5 1 A1MP17 5041 1840 1 1 A1MP18 5041 1837 6 1 AIMP19 5041 0319 7 1 20 5041 0385 7 1 21 5041 0816 9 A1MP22 5041 0815 8 1 A1MP23 5041 0811 4 1 A1MP24 5041 0417 6 1 A1MP25 5041 1631 0 1 1 26 5041 1836 5 1 A1MP27 041 0319 7 A1MP28 5041 0385 7 1 29 5041 0818 1 1 A1MP30 5041 0814 7 1 A1MP31 5041 0819 2 1 A1MP32 5041 1640 9
99. AMPLIFIER ASSEMBLY 12 32 6 4 AND DECOUPLING 5 ANALOG ns ae o gt DIGITAL SERIAL PREFIX e 4504 15V F 08903 60170 R103 281 07k C100 p R121 15 93k 3 R122 3000 w 5v 015 T 20 5 4 15 aae 1 7 a i HIGH INPUT ATTENUATOR R107 100k R106 100k CAS 5 CA2 CAR Qu C15 1 K6 i C16 E 0 014 0 014H 15 F 15V F 2 13 t2 NC U16A 45V F J 2 1 1 IO 1 3 VBC2 5V F C19 IN AMP 7 CR4 E 0 01L Ai 5110 4 3 R105 5110 PROTECTION CR11 12 VR2 12 R22 2370 15V F 15V F aE r 15V 0 14 R112 Re 5110 21 5 15V F 15 F 15V ED 2 R46 5000 15 F R54 5140 0 11 SING END TPS R40 R49 3000 iid 1000 R110 4540 R45 R111 21 5 5110 45V 683 8 100p 1749 BBp CR21 5V 5 FN FI 2 2 I 51 Q 1 e L e a d IN AMP 3 Q LOW TPB R39 NOTE 4 1000 ATTENTION a R126 R44 R42 i iti 4 5190 5000 Static Sensitive R130 R134 U12 Devices 100k f 100k nea Toss 10p 100p 50 j 21 5 15V F C31 R35
100. Analyzer key 41 0 SPCL to initialize the instrument Set the INPUT and OUTPUT switches to ground Key in AMPTD 1 V Key in 1 11 SPCL to set the input gain to 0 dB Connect the HIGH OUTPUT to the HIGH INPUT 2 Connect a high impedance ac coupled oscilloscope to 2 4 AMP The waveform should be 2 7 to 2 9 Vpp The period of the signal should be approximately ms Hint If the signal is faulty check the Programmable Gain Amplifier 3 Use the oscilloscope s vertical gain controls to adjust the waveform amplitude for 2 divisions peak to peak 4 Connect the oscilloscope to A2ZTP3 OUT 5 Set the source frequency as listed in Table 8B 17 For each setting press the appropriate filter key The peak to peak amplitude should be within the limits indicated 8 21 Service Model TROUBLESHOOTING SERVICE SHEET 2 Table 8B 17 Amplitude at A2TP3 72 Step 5 SOURCE Weighting Bandpass Amplitude Frequency Hz or High Pass Filter Limits div pp 1000 Both Off or None 1 9 to 2 1 HIGH PASS 400 Hz 1 9 to 2 1 CCITT WEIGHTING 1 9 to 2 1 CCIR WEIGHTING 7 7 to 8 6 C Message WEIGHTING 1 9 to 2 1 CCIR ARM WEIGHTING 4 1 to 4 5 A WEIGHTING 1 9 to 2 1 Hint the signal level is incorrect check the control signals indicated in Table 8B 18 Checking U10 will require probing from the circuit side of A2 Table 8 18 Control Signals C Z2 gt Step 5 H
101. B0593 DG2018K HA2 2625 B0593 DG201BK MC34004BL SN74LS00N UA714LHC 2 2625 80593 TLO72ACIG LM201AL OP 17FZ MC34004BL MUX08FQ LM339N 17 2 A Errata part change 6 49 Replaceable Parts Reference HP Part C Qty Designation Number D 4021 1826 0582 6 2 A4U22 1826 1097 0 4 A4U23 1826 0740 8 1 A4U24 1826 0740 8 1 A4U25 1826 0606 5 4026 1826 0488 1 4027 1826 0785 1 4028 1826 1097 0 4029 1820 1197 9 A4VR1 1902 0943 5 3 4 2 1902 0064 1 1 4 1902 3024 9 1 1902 0680 7 2 A4VRS 1902 0953 7 1 2450A TO 2712A A4WI 2817A AND ADOVE AW 1251 4670 2 1 tRefer to Section 7 for update tfermation 6 50 Tuble 6 3 Replaceable Parts Description IC SWITCH ANLG QUAD 16 DIP C PKG IC OP AMP WB 8 DIP C PKG IC SWITCH ANLG DUAL 16 DIP C IC SWITCH ANLG DUAL 16 DIP C PKG IC SWITCH ANLG QUAD 16 DIP C PRP 126MA IC OP AMP WB TO 99 PKG OP LOW BIAS H IMPD DUAL 8 DIP C WB amp DIP C PKG IC GATE TTL LS NAND QUAD 2 INP DIODE ZNR 2 4V 5 DO 35 PDz 4W 037 DIODE ZNR 7 5V 5 DO 35 PDz 4W 05 DIODE ZNR 2 87V 5 DO 7 PDz 4W TC 07 DIODE ZNR 1N827 6 2V 5 00 7 PDz 4W DIODE ZNR 6 2V 5 DO 35 PD 4W TC 053 NOT ASSIGNED CONNECTOR 3 PIN M POST TYPE Mfr Code 27014 06665 32293 32293 17856 27014 01295 28480 01295 28480 28480 28480 24046 28480 28480 Factory Selected Component Refer to Seetrou 5 Model
102. C12 A2A C13 A2A J1 A2A R1 A2A R2 2 R3 2 R4 A2A R5 A2A R6 2 R7 A2A R8 A2A R8 A2A 2 U1 2 U2 TRefer to Section 7 for upetate information rev 1GFEB90 HP Part Number 08903 60124 08903 60124 0160 7018 0160 7018 0150 4787 0160 3835 0160 4835 0160 7018 01 7218 Oto 7018 01650 4787 016 10416 29465 019 255 0180 2661 1251 6063 0598 7196 0698 7195 0690 0403 0608 8596 0598 7255 2100 335 0699 0404 0698 7854 0690 0410 0699 0408 1825 0783 1825 0783 L L p m b On o o Qty Table 6 3 Replaccable Paris Description Mfr Code 400HZ HIGH PASS FILTER 28480 OPTION 010 ONLY 40042 HIGH PASS FILTER 28480 OPTION 050 ONLY CAPACITOR FXD 022UF 2 100VDC POLYC 05176 CAPACITOR FXD O22UF 2 100VDC POLYC 05176 CAPACITOR FXD 22PF 5 100VDC CER 04 30 28480 CAPACITOR FXD 1UF 10 SOVDC CER 28480 CAPACITOR FXD 1UF 10 50VDC CER 28480 CAPACITOR FXD 022UF 2 100VDC POLYC 05176 CAPACITOR FXD 022UF 25 100VDC POLYC 05176 CAPACITOR FXD 0220 4 29 100VOC POLYC 05176 CAPACITOR FXO 22PF 5 100VDC CER 0 30 28480 CAPACITOR FXD 039UF 2 100VDC 28480 CAPACITOR FXD O39UF 2 100VDC 28480 CAPACITOR FXD 10 10 50VOC TA 25088 CAPACITOR FXD 1UF 10 SOVDC 25088 CONNECTOR 10 PIN F POST TYPE 28480 RESISTOR 21 5 1 05W TC 0 100 24546 RESISTOR 21 5 1 05W
103. D MODE 01295 TRANSISTOR J FET 2N4391 N CHAN D MODE 01295 TRANSISTOR J FET 2N4391 N CHAN D MODE 01295 TRANSISTOR J FET 2N4391 N CHAN O MODE 01295 TRANSISTOR J FET 2N4391 N CHAN D MODE 01295 TRANSISTOR J FET 2N4391 N CHAN D MODE 01295 TRANSISTOR NPN 2N2222A SI TO 18 500MW 04713 TRANSISTOR PNP 2 2907 SI TO 18 PD 400MW 04713 TRANSISTOR J FET 2N4391 N CHAN D MODE 01295 RESISTOR 21 5 1 125W 0 100 03888 RESISTOR 21 5 1 125W F 0 100 03888 NETWORK RES 8 SIP10 0K OHM X 7 01121 NETWORK RES 8 SIP10 0K OHM X 7 01121 RESISTOR 21 5 1 125W 0 100 03888 RESISTOR 21 5 1 125W 0 100 03888 RESISTOR 21 5 1 125W F 0 100 03888 RESISTOR 21 5 1 125W F 0 100 03888 RESISTOR 1K 1 125W F 0 100 24546 RESISTOR 7 98K 1 125W 0 25 19701 Factory Selected Component Refer to Section Replaceable Parts Mfr Part Number 1901 0050 4040 0748 1480 0116 4040 0753 1480 0116 207 120241 03 0101 2 2907 2N2222A 2N4391 2N4391 2N4391 2N4391 2N4391 2 4391 2 4391 243391 2N4391 244391 2 4391 2 4391 2 4391 2 4391 2 4391 234391 234391 234391 244391 234391 244391 234391 244391 244391 2344391 234391 234391 234391 244391 2 2222 2N2907A 234391 PME55 1 8 TO 21R5 F PMES55 1 8 TO 21R5 F 208 103 208 103 PMES5 1 8 TO 21R5 F PMES5 1 8 T0 21R5 F 55 1 8 0 21 5 55 1 8 0 21 5 4 1 8 0 1001 MF4C 1 8 T9 7981 B
104. DIODE SWITCHING 15V SOMA 75OPS DO 7 28480 DIODE SWITCHING 15V SOMA 75 5 DO 7 28480 DIODE SWITCHING 15V 50MA 750 DO 7 28480 DIODE SWITCHING 15V 50MA 750 DO 7 28480 DIODE CUR RGLTR 1N5312 100V DO 7 04713 DIODE CUR RGLTR 1N5312 100V DO 7 04713 DIODE CUR RGLTR 1N5312 100V DO 7 04713 DIODE CUR RGLTR 1N5312 100V DO 7 04713 DIODE SWITCHING 80V 200MA 2NS DO 35 28480 RELAY 2C 5VDC COIL 5A 125 28480 RELAY R 200W 2A 5 VDC 28480 RELAY R 200W 2A 5 VDC 28480 RELAY 2C 5VDC COIL 5 125 28480 INDUCTOR RF CH MLD 100UH 5 166DX 385LG 28480 INDUCTOR RF CH MLD 100UH 5 166DX 385LG 28480 NOT ASSIGNED NOT ASSIGNED INDUCTOR RF CH MLD 100UH 5 166DX 385LG 28480 BD BLK POLYC 062 BD THKNS 28480 PIN GRV 062 IN DIA 25 IN LG STL 28480 EXTR PC BD BLU POLYC 062 BD THKNS 28480 PIN GRV 062 IN DIA 25 IN LG STL 28480 TRANSISTOR NPN 2N2219A SI TO 5 PD 800MW 01295 INSULATOR XSTR POLYI 28480 HEAT SINK SGL TO 5 1O 39 CS 30161 TRANSISTOR PNP 2N2905A SI 39 PD 600MW 04713 INSULATOR XSTR POLYI 28480 HEAT SINK SGL TO S TO 39 CS 30161 Pactery Selected Component Refer to Section 5 Mode 8903B Mfr Part Number 1901 0880 1901 0880 1901 0873 1901 0873 1901 0873 1901 0873 1901 0050 1901 0050 1901 0050 1901 0376 1901 0376 1901 0376 1901 0376 1901 0376 1901 0376 1901 0376 1901 0376 1901 0880 1901 0880 1901 0880 1901 0880 1901 0179 1901 0179 1901 0179 1901 0179 145312 135312 145312 145312 1901 0050
105. Decrease the vertical gain of the oscilloscope by a factor of 10 The peak to peak amplitude displayed by the oscilloscope should be between 4 8 and 5 2 divisions If faulty see Service Sheet 5 and check Attenuator 2 and Amplifier 3 8 On the Audio Analyzer key in AMPTD 300 mV Key in 3 2 SPCL Increase the vertical gain of the oscilloscope by a factor of 10 The peak to peak amplitude displayed on the oscilloscope should be between 4 8 and 5 2 divisions If faulty see Service Sheet 5 and check Attenuator 2 9 Connect the oscilloscope to A4TP4 4 Decrease the vertical gain of the oscilloscope by a factor of 10 peak to peak amplitude displayed on the oscilloscope should be between 4 8 and 5 2 divisions If faulty see Service Sheet 5 and check Attenuator 3 the Buffer the High Pass Filter and Amplifier 4 10 On the Audio Analyzer key in 3 1 SPCL Increase the vertical gain of the oscilloscope by a factor of 10 The peak to peak amplitude displayed on the oscilloscope should be between 4 8 and 5 2 divisions If faulty see Service Sheet 5 and check Attenuator 3 11 On the Audio Analyzer key in FREQ 80 kHz Set the 80 kHz LOW PASS filter on The peak to peak amplitude displayed on the oscilloscope should be between 3 and 4 divisions If faulty see Service Sheet 5 and check the 80 kHz Low Pass Filter 12 On the Audio Analyzer key in FREQ 30 kHz Set the 30 kHz LOW PASS filter on The peak to peak amplitude displ
106. H IMPO DUAL 8 DIP C 02195 IC OP AMP GP 01295 Factory Selected Component Refer to Section 5 Replaceable Parts Mtr Part Number 2100 3350 C3 1 8 TO 2612 F 0698 6630 3 1 8 0 6811 0698 6630 43P503 0698 3459 C4 1 8 TO 5111 F 4 1 8 0 1001 3 1 8 0 5111 C3 1 8 TO 21RS F C3 1 8 TO 21R5 F C3 1 8 TO 1001 F 0698 6360 0698 6630 0698 6631 0698 6631 0837 0239 1251 0600 1251 0600 1251 0600 1251 0600 1251 0600 1251 0600 1251 0600 1251 0600 1251 0500 1251 0600 1251 0600 LJA714LHC UA714LHC LM201AL OP 17FZ LM201AL HA2 2625 B0593 DG2018K HA2 2625 B0593 DG201BK MC34004BL SN74LSOON UA714aLHC 2 2625 0593 TL072ACJG LM201AL A Errata part change 6 41 Replaceable Parts Reference Designation 4 4016 1826 1097 0 4017 1826 0753 3 A4U18 1826 0609 8 A4U19 1826 0138 8 4020 1826 1097 0 4021 1826 0582 6 4022 1826 1097 0 A4U23 1826 0740 8 4024 1826 0740 8 A4VR1 1902 0943 5 A4VF2 1902 0064 1 4 1902 3024 9 A4VR4 1902 0680 7 A4VRS 1902 0953 7 tRefer te Section 7 for update information 6 42 HP Part Number C D Qty 4 d A QJ Table 6 3 Replaceable Parts Description Mfr Code 08903 60128 SERIAL PREFIX 2450A TO 2720A HP8903B AMP WB 8 DIP C PKG O6665 IC OP AMP LOW BIAS H IMPD QUAD 14 DIP P 04713 IC MULTIPLXR ANLG 16 DIP C PKG 06065 COMPARATOR GP QUAD 1
107. IF 20MA MAX BVRz5V 28480 LED LAMP LUM INT 1MCD IF 20 BVR 5V 28480 LED LAMP LUM INT 1MCD 20 MAX BVR 5V 28480 LED LAMP LUN INT 1MCD 20 BVR 5V 28480 SOCKET IC 16 DIP SLDR 28480 EXTR PC BLK POLYC 062 BD THKNS 28480 PIN GRV 062 IN DIA 25 IN LG STL 28480 GRA POLYC 062 8D THKNS 28480 PIN GRV 062 IN DIA 25 IN LG STL 28480 LBL BD O3E MON 28480 TRANSISTOR NPN SI PO G2SMW FT 200MtIZ 28480 RESISTOR 100 1 125W F 1 0 100 24546 RESISTOR 196 1 5 125W F TC 204 100 24546 NETWORK RES 9 SIP10 0K OHM X 8 28430 RESISTOR 10K 1 125W F 0 100 24546 RESISTOR 10K 1 125W F TC 204 100 24545 RESISTOR 19 1250 0 100 24546 NETWORK RES 6 SIP330 0 OIM X 5 01121 RESISTOR 10K 1 125W TC 04 100 24546 PESISTOR 10K ta 125W TC 04 100 24546 RESISTOR 10K 1 125W TC z04 100 24546 RESISTOR tOr 1 125W TC C 100 24546 BESISTOR 10K 1 125W TC 04 100 24546 RESISTOR 51 1K 1 125W TC 04 100 2 1546 CONNECTOR SGIL CONT FIN 1 14 MM BSC 52 SO 28490 CONNECTOR SGL CONT PIN 1 t4 MM ESC S2 SQ 28480 CONNECTOR St3t CONT PIN 1 14 MM BSC S2 SQ 28480 CONNECTOR SSL CONT PIN 1 14 MM BSC SZ SQ 28480 CONNECTOR SGL CONT PIN 1 14 MM BS S2Z SQ 28480 CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ 28480 CONNECTOR SGL CON 1 14 MM BSC S7 SQ 28480 CONNECTOR SGL CONT FIN 1 14 MM ESC SZ SO 28480 CONNECI OR SGL CONT PIN 1 14 MM BSC SZ SQ 28480 CONNECTOR SGL CONT
108. MOTHERBOARD ue ASSEMBLY 08903 6801 NOTCH CONTROL DRIVERS P O A13 POWER SUPPLY P O NOTCH FILTER ASSEMBLY 08903 60163 1 2 9 INTEGRATOR 2 RMS DETECTOR A M 4 SUM AMPLIFIER 2 1 P O 8 0150 REF 14 F3 I 25 NO FAG 3 9 A s 15V 1 F3 10 15V xa REF 13 F4 E 15 14 NO FAQ 4 n 11 U6 C19 TO 310 81007 15V F ear 7 Q22 cie d T 7980 Lo om 7 6 U15A UA D 3 5V 15V REF 1 FS R26 2 1 MS ree DC 019 NO 5 7 aqa 923 15 98x 24 19 AY 12 NE U15B X UE 2 Vi Vi R27 P O A13 NO FAG gt xm 1 45V ry 924 32k RMS 2 rem m 15V 68k C25 0 5 15 B 0 R28 3 U144 Y Q25 R96 P O NO FAG 7 R23 1000 XA38 t 7 3 27 gt R28 ids MS 14 EAD 7 68k E 12Bk 12 CU l A5V F 9 ER 0148 10 2 R30 NO FAG 5 F8 256k 1 8 140 R31 15V 44 Vi Fg 511k NO FAG 9 9 NTO 28 R3C 10 U14C TPB 68k VREF R32 1 13 T 20 T NO FRQ 10 44 um F10 TP44 i 7 3 VIA 1 REF 4 _ lt 2 PRE NOTCH m NO FRQ 0 5 lt we NAG MM 7 XANERAGE DETECTOR
109. Model 3903B Table 6 3 Replaceable Parts Reference HP Part Designation Humber D Qty Description Code Mfr Part Number A4 08903 60283 SERIAL 2816 AND ABOVE HP8903B 487 0698 8822 9 10 RESISTOR 6 81 1 125W TC 0 100 28480 0698 8822 A4R8 0698 8822 9 RESISTOR 6 81 1 125W F TC 204 100 28480 0698 8822 A4R9 0698 8822 9 RESISTOR 6 81 1 125W 0 100 28480 0698 8822 A4R10 0698 8822 9 RESISTOR 6 81 1 125W F TC 0 100 28480 0698 8822 A4R11 0698 0084 9 RESISTOR 2 15K t 125W TC 0 100 24546 4 1 8 0 2151 4 12 0698 6360 6 RESISTOR 10K 1 125W TC 20 25 28480 0698 6360 A4R13 0698 6631 4 7 RESISTOR 2 5K 1 125W 0 25 28480 0698 6531 A4R14 0757 0280 3 RESISTOR 1K 1 125W F 0 100 24546 C4 1 8 TO 1001 F A4R15 0757 0274 5 3 RESISTOR 1 21K 1 125W TCz 0 100 24546 4 1 8 1211 A4R16 0757 0274 5 RESISTOR 1 21K 1 125W F TC 0 100 24546 C4 1 8 TO 1211 F A4R17 0757 0443 0 1 RESISTOR 11K 1 125W 0 100 24546 C4 1 8 T0 1102 F A4R18 0757 0280 3 RESISTOR 1K 1 125W TC 0 100 24546 C4 1 8 T0 1001 F A4R19 0757 0438 3 RESISTOR 5 11K 1 125W TC 0 100 24546 4 1 8 0 5111 A4R20 0757 0437 2 1 RESISTOR 4 75K 1 125W TC 0 100 24546 4 1 8 0 4751 4921 ASSIGNED 4822 0757 1094 9 RESISTOR 1 47 1 125W TC 04 100 24545 C4 1 8 TO 1471 F A4R23 0698 3484 9 RESISTOR 6 65 1 125W 0 100 24545 4 1 8 0 6651 A4R24 0698 4470 5 1 RESISTOR
110. N 0 through 255 the Oscillator coarse tune code is set to the number specified by N N is keyed in as a decimal value and not a hexadecimal value See Service Sheet 9 and Special Functions 55 N and 57 N 57 N Oscillator Fine Tune Same as Special Function 56 N except that it pertains to fine tuning 58 N Source Fine Level Permits the fine level code of the Source to be displayed or manually set If no suffix is keyed in that is 58 SPCL the current Source fine level code is displayed where 0 is the lowest level and the 255 is the highest For N 0 through 255 the Source fine level code is set to the number specified N is keyed in as a decimal value and not a hexadecimal value See Service Sheet 10 and Special Function 59 N 59 N Source Coarse Level Permits the coarse level code of the Source to be displayed or manually set If no suffix is keyed in that is 59 SPCL the current Source coarse level code is displayed where 31 is the lowest level 0 is the highest and 32 through 63 switch the level off For N20 through 63 the Source coarse level code is set to the number specified by For N 0 through 31 the level is controlled in 2 5 dB steps where the attenuation is N times 2 5 dB N is keyed in as a decimal value and not a hexadecimal value See Service Sheet 11 and Special Function 58 N 60 0 Key Scan keyboard is scanned and a keycode is displayed and output to the HP IB key codes are shown in Figure 8 6
111. N Q 9 99 88 o oo MN RE S a ES w nin 939 TH K 555 14 89 8B 114 4 P O A13 POWER SUPPLY AND MOTHERBOARD ASSEMBLY 08903 60129 O A4 OUTPUT AMPLIFIER VOLTMETER ASSEMBLY 08903 60128 zi 1 LON PASS FILTERS ATTENUATOR 1 Z4 AMPLIFIER r PASS BAND GAIN 2 GAIN 5 OdB OR 2098 NC r15V F2 SERIAL PREFIX 24504 ATTENUATOR 2 5 0498 2048 2 TP8 519 0 06 VBC 45V F1 100 NOTE E 0 016 FROM Shan C1 R14 247 RB R32 R33 QUT rai 3 1000 11k 1000 1000 309 3 23 C25 29 1 90H mel 2500 T 2 2p R34 A30 9000 GAI 2500 OUTPUT OUTPUT n CLAMP 1000 15 Y 45V R3B 15V 2870 vien s 10 61 54 VDO 10 51 imu S ngo L 54 VOC OU AMP4 R38 CR4 1 una UD MAN A26 16 2k 16 2k 11 54 T 30 61 VDC 5 R40 NOTE 1 ve 2870 E 54 TO VDC 2870 14 6 7 fs HIGH PASS FILTER 4 gt x 15V F 1 C5 1 BUFFER 15V F2 1 0H U14B 7 1 00 6 7 B Te 162k D v 6 7 20 007 T0 30 007VDC 225 T0 25 mVD NOTE 1 NOTE 1 d CLAMP me Ls 18 6 7 110 51 UICE UP 450 lt 2 R43 11 54 TO 10 51 VDC NOTE 1 15V F 1 d x 15V F2 L s r
112. SI TO 18 PD 400MW TRANSISTOR PNP 2N2907A SI 18 PD 400 RESISTOR 3 16K 196 125W 0 100 RESISTOR 8 25K 1 125W F 0 100 RESISTOR 9K 1 125W F TC 0 25 RESISTOR 1K 1 125W F TC 04 25 RESISTOR 8 25K 1 125W TC 0 100 RESISTOR 909 1 125W F TC 0 100 Mfr Code 28480 28450 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 02768 28480 28480 28480 28480 01295 27014 01295 01295 01295 01295 01295 28480 04713 04713 24546 24546 28480 28480 24546 24546 Factory Selected Component Refer to Section 5 Replaceable Parts Mfr Part Number 08903 60283 SERIAL PREFIX 2816A AND ABOVE HP8903B 1901 0050 1801 0880 1901 0880 1901 0880 1901 0880 1901 0880 1901 0880 1901 0880 1901 0880 1901 0040 1901 0880 1901 0050 1901 0050 1901 0880 1901 0880 1901 0880 1901 0880 1901 0050 1901 0880 0490 1423 8140 0210 8140 0210 9100 0539 9100 0539 9100 0539 4040 0748 1480 0116 4040 0752 1480 0116 207 120241 03 0101 08903 80069 1205 0202 1854 0753 1205 0202 2N4391 LM394 2N4391 2N4391 2N4391 2 4391 2 4391 1854 0071 2N2907A 2N2907A C4 1 8 TO 3161 F 4 1 8 0 8251 0698 6343 0598 6362 4 1 8 0 8251 4 1 8 70 909 Errata part change 6 45 Replaceable Parts
113. Service Sheet BD4 and check the Counter 73 Output Amplifier Check 1 the Audio Analyzer key in 41 0 SPCL to initialize the instrument Set the INPUT and OUTPUT switches to ground Set the 80 kHz LOW PASS filter off Key in AMPTD 300 mV Key in 1 11 SPCL to set the input to the 3V range Key in 3 1 SPCL to set the output to the least sensitive range Connect the HIGH OUTPUT to the HIGH INPUT 2 Connect a high impedance ac coupled oscilloscope to ASTP7 OUT The waveform on the oscilloscope should be a sine wave with an amplitude between 800 and 900 mVpp and a period of approximately 1 ms If faulty see 72 Notch Filter Check 3 Use the oscilloscope s vertical gain controls to adjust the display amplitude for 5 divisions peak to peak deflection 4 Connect the oscilloscope to A4TP8 1 The peak to peak amplitude displayed on the oscilloscope should be between 2 4 and 2 6 divisions If faulty see Service Sheet 5 and check Attenuator 1 and Amplifier 1 5 On the Audio Analyzer key in AMPTD 30 mV Key in 3 3 SPCL The peak to peak amplitude displayed on the oscilloscope should be between 2 4 and 2 6 divisions If faulty see Service Sheet 5 and check Attenuator 1 6 Connect the oscilloscope to A4TP6 2 peak to peak amplitude displayed on the oscilloscope should be between 4 8 and 5 2 divisions If faulty see Service Sheet 5 and check the Low Pass Filters 7 Connect the oscilloscope to A4TP5 AMP 3
114. Weighting Bandpass and High Pass Filters 12 On the Audio Analyzer key in AMPTD 300 mV Decrease the vertical gain of the oscilloscope for a display of 5 divisions peak to peak 13 On the Audio Analyzer key in the frequencies and the weighting bandpass or high pass filter indicated in Table 8B 8 for the filters installed in the instrument If no filter options are installed go on to the next step For each setting the peak to peak amplitude displayed on the oscilloscope should be within the limits indicated If faulty see Service Sheets 2 2A and 2B and check the Weighting Bandpass and High Pass Filters 8 8 rev 20J 0 87 Model 8903 Table 8B 8 Amplitude Limits at 71 Step 13 Weighting Bandpass Source Amplitude Limits divisions pk pk or High Pass Frequency Filter Hz 400 Hz HIGH PASS CCITT WEIGHTING CCIR WEIGHTING C MESSAGE WEIGHTING CCIR ARM WEIGHTING A WEIGHTING Reduce the oscilloscope s vertical gain by 10 Service 14 On the Audio Analyzer set the Weighting Bandpass or High Pass Filter off if one is on Key in FREQ 1 kHz and AMPTD 1 V Connect the oscilloscope to A2TP4 AMP Adjust the oscilloscope s vertical gain for 7 1 divisions peak to peak amplitude 15 DC couple the and connect it to 2 2 RMS The waveform should be a dc voltage between 2 4 and 2 6 divisions with respect to ground If faulty see Service Sheet 2 and check
115. and 1 8 divisions If faulty see Service Sheet 3 and check the RMS Detector 5 On the Audio Analyzer key in 5 2 SPCL to switch to the Average Detector The waveform should be a dc voltage between 1 7 and 1 8 divisions If faulty see Service Sheet 3 and check the Average Detector 8B 14 rev 20J UN87 8903 Service PRINCIPLES OF OPERATION SERVICE SHEET 1 SERVICE SHEET 1 A2 Input Amplifier Assembly Input Circuits PRINCIPLES OF OPERATION General This portion of the Input Amplifier Assembly A2 contains the AC DC Switch Input Attenuator Over Voltage Protection and Differential to Single Ended Amplifier These and the other circuits on the Input Amplifier Assembly condition the signal to be suitable to drive the Notch Filter and Output Amplifier Input Circuits and Input Attenuator The signals at the HIGH and LOW INPUT connectors are filtered by RFI filters 1312 and 13 16 and A13L3 and 13 15 The INPUT connectors are both floating The LOW INPUT can be shorted to ground by chassis part S3 The inputs are ac coupled by C2 and C88 except in the dc level measurement mode where the capacitors are effectively shorted by R2 and R104 which are switched in by K7 The High and Low Input Attenuators are identical Only the High Input Attenuator will be discussed The attenuator is a set of two divider legs with four outputs which are selected by relays K4 K5 and K6 and FET Q2 The two dividers present a combined input
116. approximately 1 25 Vdc If faulty see Service Sheet 1 and check the AC DC Switch 21 Press AC LEVEL The oscilloscope should show a dc voltage of approximately 0 Vdc If faulty see Service Sheet 1 and check the AC DC Switch 22 Remove the short from the HIGH INPUT Remove the connection from the LOW INPUT and connect it to the HIGH INPUT Set the INPUT switch to ground The oscilloscope should remain as in step 21 If faulty see Service Sheet 1 and check the AC DC Switch 23 Press S DC LEVEL Key in 2 3 SPCL again The oscilloscope should show a dc voltage approximately 1 25 Vdc If faulty see Service Sheet 1 and check the AC DC Switch 72 Notch Filter Check 1 On the Audio Analyzer key in 41 0 SPCL to initialize the instrument Set the INPUT and OUTPUT switches to ground Set the 80 kHz LOW PASS filter off Key in AMPTD 3 V and FREQ 98 7 Hz Key in 1 11 SPCL to set the input to 3V range Key in 53 0 SPCL to set the Notch Filter to its lowest frequency range Key in 54 115 SPCL to set the Notch Filter Coarse Tune near the middle of its range approximately 98 7 Hz Connect the HIGH OUTPUT to the HIGH INPUT 2 Connect high impedance ac coupled oscilloscope to A2TP3 OUT The waveform the oscilloscope should be a sine wave with a amplitude between 8 and 9 Vpp and a period of approximately 10 ms If faulty see 71 Input Amplifier Check 3 Use the oscilloscope s vertical gain controls to adjust the display amplitude fo
117. are exclusive to the HP IB see Service Sheet BD4 8 8 rev 20J UN87 BALANCE AND FINE TUNE AC DC INPUT DIFFERENTIAL TO PROGRAMMABLE CONTROL SUM AND ATTENUATOR ATTENUATOR ATTENUATOR INPUT SWITCHES ATTENUATOR HIGH OVER SINGLE ENDED GAIN OUTPUT 1 AMPLIFIER 2 AMPLIFIER 3 AMPLIFIER VOLTAGE AMPLIFIER AMPLIFIER AMPLIFIER 1 LOW PASS 3 BUFFER _ HIGH PASS 4 CHISH PROTECTION FILTEA FILTER tly na KH a a gt LOW OVER LOW VOLTAGE PROTECTION INPUT RANGE DETECTOR OUTPUT RMS AVG DETECTOR OVERLOAD PRE NOTCH DETECTOR RMS AVERAGE OUTPUT OVERLOAD DETECTOR SINAD DETECTOR P METER TRANSCONDUCTANCE MEME AMPLIFIER AMPLIFIER gt VOLTMETER RIPPLE INPUT FILTERS SELECTOR REF REF VOLTAGE TO TIME CONVERTER METER gt SWITCH 98888 8885 _ GATE o INPUT l SELECT O SELECT rA Cc Doo s sJ C9 Eo oooo oo 929090 38 Ae oooga cama o LATCHES o CYCLE COUNTER o D TRIGGER CYCLE KEYBOARD AND DISPLAY COUNTEA INSTRUMENT BUS nae 5 VOL TMETER O GATE CLOCK Q COUNTER ROMC BUS 1 0 g DECODERS REVERSE VOLTAGE PROTECTION LATCHES EB Axis REMOTE INTERFACE DATA BUS QUTP PROBESSOR 2 MHz
118. are given below The circuits or points to check are marked on the schematic diagram by a hexagon with a check mark and a number inside for example lt V3 gt In addition any points outside the labeled circuit area that must be checked are also identified Fixed signals are shown on the schematic also inside a hexagon for example 1 9 TO 42 1 VDC gt Extend the board assembly where necessary to make measurements These procedures assume that the source is working properly Equipment Digital HP 3455A Oscilloscope HP 1740A C 1 gt Ripple Filters Check l On the Audio Analyzer key in 41 0 SPCL to initialize the instrument Set the INPUT and OUTPUT switches to ground Key in AMPTD 3 V Key in 1 11 SPCL to set the input gain to 0 dB Key in 3 1 SPCL to set the output gain to 0 dB Connect the HIGH OUTPUT to the HIGH INPUT 2 Connect one channel of a high impedance dc coupled oscilloscope to A2TP2 RMS Connect the other channel to pin 1 of U10A Both channels should read between 42 9 and 43 1 Vdc and both should read the same 3 On the Audio Analyzer connect and disconnect the HIGH INPUT several times and observe the two traces on the oscilloscope The signal at pin 1 of U10A should lag in time slightly behind the signal at A2TP2 when the input is connected and disconnected 4 On the Audio Analyzer reconnect the HIGH INPUT Connect one channel of the oscil
119. are summed together their outputs are in parallel and the composite signal is summed with the output from Integrator 1 in Sum Amplifier 2 to create a feedback loop that fine adjusts the tuning and balance of the Notch Filter Output Amplifier Voltmeter A4 The signal from the Notch Filter is further processed before being detected by the voltmeter or sent the the rear panel MONITOR output The signal is amplified by Amplifier 1 gain 5 the Low Pass Filters gain 2 Amplifier 3 gain 10 and Amplifier 4 gain 10 The maximum gain is thus 1000 or 60 dB Attenuators 1 2 and 3 each have a selectable attenuation of 0 20 dB The overall gain is set by the Controller so that the level sensed by the Output RMS Average Quasi peak Detector is 3V or less Switching of the attenuators can be controlled by Special Function 3 and is summarized in Table 8B 3 Selection of the active low pass filters is from the front panel or HP IB When no filtering is selected the 750 kHz filter is active The other two filters are 80 and 30 kHz The Buffer amplifier has 0 dB gain The High Pass Filters following the Buffer are either 0 3 Hz in ac level or 13 Hz in the other measurement modes The 13 Hz filter is an active filter Amplifier 4 drives the MONITOR output the Output RMS Average Quasi peak Detector and the Counter Input Schmitt Trigger see Service Sheet BD4 The Output RMS Average Quasi peak Detector converts its input into a dc voltage correspo
120. between several address inputs indicates dependency or indicates demultiplexing of address inputs and outputs The m suffix indicates the number of cells that can be addressed Enable Dependency Binary affecting input which when active enables all outputs When inactive open collector and open emitter outputs are off and three state out puts are at an external high impedance state When the enable input affects only certain inputs and outputs they will be numbered to indicate the logic connection Transmission Dependency Binary affecting input which bidirectionally connects de pendent inputs and outputs Mode Dependency Binary affecting input used to indicate that the effects of partic ular inputs and outputs of an element depend on the mode in which the element is operating The m is replaced with a number or letter the identifier Interconnection Dependency Indicates the existence of internal logic connections between inputs outputs internal inputs and or internal outputs The m is replaced with a number the identifier Comma AND Function Slant OR Function NOTE The identifier m is omitted if it is one that is when there is only one depen dency relationship of that kind in a particular device When this is done the de pendency indicator itself G C EN or V is used to prefix or suffix the affected dependent input or output Service 8 27 Service Model 8903B SCHEMATIC SYMBOLOGY AND S
121. data written to the bus Thus rrrr and wwww are normally the binary form of the hexadecimal d Exceptions to this are Special Functions 0 03d through 0 064 and 0 0 through 0 0 which control the display itself Since the display has a limited set of segments for alphabetic characters the hexadecimal characters A B C D E and F are displayed on entry as E H L P and blank respectively and they are entered from the keyboard as Shift 0 Shift 1 Shift 2 etc or from the as X2 etc Table 8 1 summarizes the hexadecimal entry and readback for Direct Control Special Functions rev 20SEP87 8 7 Service Model 8903B Table 8 1 Hexadecimal Information for Direct Control Special Functions Hexadecimal Decimal Binary Keystroke HP IB Code Display character Equivalent AY Entry On Entry ON Ooh G O Q P WON 9 S Shift 0 S Shift 1 S Shift 2 S Shift 3 S Shift 4 S Shift 5 gt X gt lt 05 22 o lm p N X IMI gt lt 2 3 4 5 6 7 8 9 A B C D E F gt lt Direct Control Special Function Applications Direct Control Special Functions are used in troubleshooting to provide manual control of various switches or digital to analog devices in the hardware where other special functions or front panel keys prove ineffective Some examples will illustrate how to use Direct Contro
122. easy correlation to schematic Interconnect information Circled letter with adjacent number indicates circuit path continuation to diagrams procedures another service and component location Plug in sheet 3 in diagrams Connection to information this example circuit signifies number Look for same Board Board Board measuring aid metal indicates circled letter Assembly Assembly Assembly post circuit pad pin of socket on the indicated designation name part number etc provided XA2 service sheet Circuit Ns 2 Signal functional name and title 2 OUTPUT ASSY 08620 60129 OR destination ALC HIGH Socket designation SERIES 2 6007 2 REGULATOR assembly J3 not 91 J3 mounted 5 lt ES on assembly Cix A2 80 4 847 2 C l R1 2 5 Non plug in 3 information Solder point 552 J4 1 M ub XXXX S Connector symbols within the borderlines of board assemblies signify connections to the assembly which are separate from those made through the integral plug part of the assembly Serial prefix of instrument to which schematic directly applies Wire color code Code used 11 10 681 is the same as the resistor color code First number identifies the base color second number the wider stripe and the third number the narrower stripe Reference designations within outlined assemblies are
123. impedance of 100 R2 adds another 1 for dc measurements R3 and R4 form a 12 dB divider C3 C4 C6 C7 and R5 compensate stray capacitance for flattest frequency response R6 R7 and R8 form a 24 and 40 dB divider The 24 dB tap is at the junction of R7 and R8 C9 C11 C12 and R9 frequency compensate the 24 dB divider In addition C8 C109 and R96 are switched in by Q3 to frequency compensate the 40 dB divider For input levels below 3V the attenuation is set to 40 dB Over Voltage Protection The Over Voltage Protection clips the input signal on either high or low path when tbe signal exceeds a magnitude of 15V The circuit for both paths is identical Using the high path as an example the clipping diodes CR9 CR10 CR11 and 12 VR and VR2 reference the clipping diodes to 12 and 12V Follower amplifier U7 feeds the signal through C20 and C21 to the clipping diodes to prevent ac modulation of the capacitance of the clipping diodes to eliminate distortion The signal from voltage divider R108 and R112 is fed to the Input Overload Detector see Service Sheet 2 Differential to Single Ended Amplifier U6 012 U5 convert the differential signal from the High and Low Input Attenuators to a single ended signal that is one that is referenced to ground The differential gain of U6 and 1712 is programed by and K2 as cataloged in Table 8B 12 In the dc level measurement mode only 0 dB gain is used
124. is then designated as assembly A242 2 The only difference between the CCIR and the CCIR ARM Weightin Bandpass Filter Assemblies is the values of R6 R11 R13 and R16 as follows listed g FILTER ASSEMBLY R 8 3 CCIA 08903 60128 CCIA ARM 08803 60162 464 46400 46400 Schematic General Information in 444 08903 60126 08903 60127 08903 60161 08903 60162 Component Locators 2 1 AND 2 2 Figure 88 108 SERVICE SHEET 2B INFORMATION 952 SEE REVERSE SIDE 88 108 2 1 OR A2A2 C C R WEIGHTING FILTER ASSEMBLY OPTION 012 OR 052 08903 60126 R O Az INPUT A2A2 C WESSAGE_WELGHT NO FILTER ASSEMBLY OPTION OR 08908 80427 P O A2 INPUT 2A G C t ARM FILTER ASSEMBLY O14 OF 20808 80182 AMPLIFIER 7 ASSEMBLY ASSEMBLY s 08903 60170 m i Dc 08903 60170 s 2 51 6 den E m p o B2 5k 6800p Ji or XA2A2 R10 2 1 0 6800p 7500 2400p uc FBK lt 8E nc l a 3010 0 02234 5 OR 2 2 Ji asy UIA asyr 9 3 2700 7309 0 Re NOTE 2 650 i Yin t 3 C4 1 gt 1 sip A7 JS 7870 5 did l E i B 20054 gt Lat 0 02234
125. is adjusted to make an accurate measurement A measurement is not made until all of the tests are passed in succession If a test is not passed corrective action is taken The decision after that block then forces the program back to the top of the supervisor bypassing the measurement for that loop if corrective action 1s unsuccessful The software interface with the hardware makes use of two concepts called software state and hardware state The software state is located in the RAM and totally describes the state of the instrument On power up the initialization procedure loads the software state from ROM Keyboard and HP IB entry routines modify only the software state and do not effect the hardware immediately The setup block in the supervisor is where the hardware state is made to conform with the software state Setup is not the only place where hardware is affected tune level and measurement blocks manipulate the hardware as well The Keyboard and HP IB interrupt the flow around the loop forcing the Microprocessor to execute a short program and then return to the loop as shown in the diagram Since the supervisor can be interrupted at any point but always returns to a single location Keyboard and HP IB interrupts must abort the current measurement and start a new measurement cycle The Keyboard and HP IB can be thought of as a medium through which the user requests a certain setup The microprocessor based Controller interacts closely with t
126. of U19A or U19B switches the respective output FET Q6 or Q5 on pulling the output connection to either ground or 2 4V Output Overload Detector The Output Overload Detector compares the level from the Output RMS Average Quasi peak Detector to a reference set by R60 and R61 If the level exceeds the reference U19D switches Q7 on which resets the Overload Flip Flop see Service Sheet 12 and reduces the gain of the Output Amplifier to 0 dB 8B 44 rev 20J UN87 Model 8903B Service TROUBLESHOOTING General Procedures for checking the Output Amplifier Voltmeter Assembly are given below The circuits or points to check are marked on the schematic diagram by a hexagon with a check mark and a number inside for example 73 In addition any points outside the labeled circuit area that must be checked are also identified Fixed signals are shown on the schematic also inside a hexagon for example Extend the board assembly where necessary to make measurements These procedures assume that the source is working properly Equipment Digital Voltmeter HP 3455A Oscilloscope HP 1740A 71 Output RMS Average Quasi peak Detector General Check 1 On the Audio Analyzer key in 41 0 SPCL to initialize the instrument Set the INPUT and OUTPUT switches to ground Key in AMPTD 3 V Key in 1 11 SPCL to set the input gain to 0 dB Key in 3 1 SPCL to set the output gain to 0 dB Connect the
127. of the input offset the IC is probably good If the filters appear to work properly except that the frequency response is out of limits check the frequency response of the individual filter stages against the following plots An easy way to do this is as follows a Set the source to the desired frequency at 1V b Set the LOW INPUT and OUTPUT switches to ground Set IMPEDANCE to 500 Connect the HIGH OUTPUT to the HIGH INPUT c Connect an ac voltmeter to A2TP4 PGM AMP The voltmeter reading is a reference d Connect the voltmeter to the output of the filter stage to be checked The voltmeter reading relative to the reading in step c should agree with the plots in Figures 8B 4 to 8B 31 for the particular frequency and filter stage Note that the plots use a logarithmic magnitude scale The dB reading is 20 log reading of step d reading of step c Filter Board Removal To remove a filter board assembly turn the screw in each of the four plastic standoffs one quarter turn counter clockwise then work the board off the standoffs and interconnect plug To install a board assembly align the board with the standoffs and the interconnect plug then press the board into place If the board hangs up on a standoff squeeze the top of the standoff with needle nose pliers while pressing on the board The standoff has memory and remains slightly spread apart Relock the standoffs by turning the plastic screws one quarter turn clockwise 2
128. output also is fed to the analog SINAD meter circuitry The Pre Notch RMS Average Detector can be switched to respond to the true rms or the absolute average value of the input voltage by Special Function 5 The Notch Filter is a state variable filter that is a filter which is formed by combining various circuit blocks which perform simple mathematical functions amplification inversion summation and integration simplified diagram of the basic filter is shown in Figure 8B 1 The transfer functions at various points in the diagram are also given Band reject bandpass high pass and low pass responses are all generated by the circuit The output of the circuit diagram is V the notch filter output In actual use the circuit is configured to obtain three types of responses band reject or notch in the SINAD distortion and distortion level measurement modes bandpass in Special Function 44 3 and flat in the other ac measurement modes Referring now to Block Diagram 2 the transfer function has a notch filter response when both switches at the input to the Sum and Output Amplifier are closed transfer function has a bandpass response when the path from the input to the Sum and Output Amplifier is open transfer function has a flat response when the path from Integrator 1 to the Sum and Output Amplifier is broken In the notch filter configuration the notch frequency is coarse tuned by adjusting w in the simplified dia
129. power source to the product input wiring terminals power cord or supplied power cord set SAFETY SYMBOLS Indicates instrument damage can occur if indicated operating limits are exceeded Indicates hazardous voltages Indicates earth ground terminal WARNING A WARNING note denotes a hazard It calls attention to a procedure practice or the like which if not correctly performed or adhered to could result in personal injury Do not proceed beyond a WARNING sign until the indicated conditions are fully understood and met CAUTION A CAUTION note denotes a hazard It calls attention to an operation procedure practice or the like which if not correctly performed or adhered to could result in damage to or destruction of part or all of the product Do not proceed beyond an CAUTION note until the indicated conditions are fully understood and met 2 Chapter 1 Regulatory Information Updated March 1999 Safety Considerations for this Instrument WARNING This product is a Safety Class I instrument provided with a protective earthing ground incorporated in the power cord The mains plug shall only be inserted in a socket outlet provided with a protective earth contact Any interruption of the protective conductor inside or outside of the product is likely to make the product dangerous Intentional interruption is prohibited Whenever it is likely that the protection has been impaired the instrument must be made inoper
130. power up routines and the run of the Read Only Memory Check 3 8 4 2 1 for about 2 seconds This indicates that all power up checks passed and that a visual front panel check is in progress see V3 4 8 4 2 1 with 1 blinking indefinitely until a key is pressed The behavior of the LED 1 is also affected by the presence of an input signal Any other sequence indicates a failure of the check Passing this check indicates that the Controller is functioning properly and that there is no catastrophic failure in the following circuits Read Only Memory Random Access Memory Instrument Bus and Keyboard only that no key is down If Indication Abnormal If the TEST LEDs come on and remain in the indeterminate state of step 1 check the Controller Kernel See Service Sheet BD4 If other indications appear in or after step 2 consult Power Up Checks paragraph 8 27 which discusses the individual checks documents the error indications and cross references to the service sheets v3 Front Panel LED Check Procedure Disconnect all connections to the INPUT Switch LINE to OFF and back to ON Normal Indications After less than 1 8 second all front panel LEDs display segments and decimal points should light for about three seconds then the displays blank for one second then after a few seconds settle to readings of 0 000 kHz in the left display and lt 0 100 mV in the right display The measurement cycle indicator LED in th
131. should be in phase 13 On the Audio Analyzer key in 44 3 SPCL The two signals should be approximately 180 out of phase 14 On the Audio Analyzer key in 44 2 SPCL Connect the oscilloscope to the source of Q2 The waveform should have an amplitude of less than 200 mVpp Hint Pin 14 of U10D should be OV Q2 should be on 15 On the Audio Analyzer key in AMPTD 100 mV Key in 3 3 SPCL to set the Gain Switch off The waveform should be a sine wave with a phase reversal at each peak and have an amplitude of approximately 5 Vpp Hint Pin 14 of UIOD should be 15V Q2 should be off Hint The signal at A3TP2 should be sine wave with an amplitude of 16 Vpp If faulty see Service Sheet 5 and check Attenuator 1 16 Connect the oscilloscope to the source of Q3 The waveform should be a positive full wave rectified sine wave with an amplitude of approximately 2 Vpp Hint Q3 should be off 17 On the Audio Analyzer key in 3 1 SPCL Key in AMPTD I V The signal amplitude should be less than 500 mVpp Hint Q3 should be on NOTE The following steps check the overall performance of the Notch Filter at various frequen cies The notch circuitry of Service Sheet 3 is assumed to be operating properly and the source is assumed to have less than 0 01 distortion and noise If distortion is high on all ranges perform the Notch Filter Tune and Balance Adjustment paragraph 5 12 and also check the distortion of the Output Amplifier 1
132. table Table 8A 1 Instrument Block Diagram and Subsection Breakdown Service Sheet Subsection Cicuts Measurement input Notch Filter Output Amplifier Detectors DC Voltmeter Source Oscillator Output Attenuator Digital Controller Counter Keyboard and Display Remote Interface Power Supply Power Supplies Motherboard input Circuits Measurements on the input signal are made on the difference between the HIGH and LOW INPUT connectors The range of signals at the INPUT connectors is 20 Hz to 100 kHz and 0 to 300 Vrms for ac signals and 0 to 300V either polarity for dc signals Either INPUT connector HIGH or LOW can be floated upto 300V with respect to ground For ac measurements the AC DC Switches insert a capacitor into both the high and low paths The ac input impedance for each path is 100 with respect to ground The dc impedance is 101 The Input Attenuator has voltage dividers on both high and low paths which can be set to 0 12 24 or 40 dB In automatic operation the gain is set to 0 dB when the input signal is 3V or less The Over Voltage Protection circuitry limits the input signal level of either the high or low path to 13 Vp In addition the output of the protection circuit is sensed by the Input Overload Detector If the level exceeds a preset reference all input circuits are set to minimum gain The Differential to Single Ended Amplifier converts the non referenced
133. the A4 board part number 08903 60128 to 08903 60183 Quasi Peak On the Component Locator e 08903 60183 Use the partial component locator on page 8B 114 3 On the Component Coordinates e 08903 60183 Use the partial component coordinates on page 8B 114 3 On the A13 schematic e 08903 60192 Change the part number of the A13 POWER SUPPLY AND MOTHERBO ARD ASSEMBLY to 08903 60292 On the A4 schematic e 08903 60283 Change the board part number to 08903 60283 Quasi Peak Note The 08903 60282 not Quasi Peak and the 08903 60283 Quasi Peak are identical boards except for the positioning of W1 See rry schematic on page 8 116 5 and the Component Locator on page 8B 114 4 On the Component Locator e 08903 60283 Use the new component locator on page 8B 114 4 for serial prefixes 2816 and above 8903B and 2818A and above 8903E rev 14FEBS89 Model 8903 Service Q NJ N NRK e PRO PO PO P9 GNM O CO C 2 02 QJ PO C GJ PO PO PO Yr y I Y JR r gt gt JR JR gt QJ G G GJ CO Q SN gt gt gt gt gt gt gt gt gt gt gt P gt gt gt gt t NJ NH PD MEE RO eo WR 0 S PO IND rp gt P m A A A A A A A A A A A A A A A A A A A A A A A gt gt gt fN PO PO fs WWW fN S e
134. the Audio Analyzer key in 6 1 SPCL to hold the Notch Filter at its present setting Key in FREQ 900 Hz amplitude display should read between 15 and 20 dB but more importantly the SINAD meter should agree with this reading to within 1 dB If the SINAD meter is faulty see Service Sheet 6 and check the SINAD meter circuits 10 On the Audio Analyzer key in 0 524 SPCL The SINAD meter should read beyond full scale If faulty see Service Sheet 6 and check the Meter Peg Off Switch 11 On the Audio Analyzer key in 0 528 SPCL The SINAD meter should read between 0 and 0 5 dB If faulty see Service Sheet 6 and check the Meter Peg Off Switch v5 Pre Notch RMS Average Detector Check 1 On the Audio Analyzer key in 41 0 SPCL to initialize the instrument Set the INPUT and OUTPUT switches to ground Key in AMPTD 8 V Key in 1 11 SPCL to set the input to the 3V range Connect the HIGH OUTPUT to the HIGH INPUT 2 Connect a high impedance ac coupled oscilloscope to A2TP3 OUT The waveform on the oscilloscope should be a sine wave with a amplitude between 8 and 9 Vpp and a period of approximately 1 ms If faulty see Input Amplifier Check 3 Use the oscilloscope s vertical gain controls to adjust the display amplitude for 5 divisions peak to peak deflection of the signal rev 20J UN87 8B 13 Service Model 8903B 4 DC couple the oscilloscope and connect it to A2TP15 RMS2 The waveform should be a dc voltage between 1 7
135. the Output RMS Average Quasi peak Detector with a reference and sets the Output Amplifier gain to 0 dB if an overload is sensed unless defeated by Special Function 3 The SINAD Log Ratio Meter Amplifier produces an output voltage which is the log of the ratio of the outputs of the Pre Notch and Output RMS Average Quasi peak Detectors The amplifier drives a Meter Transconductance Amplifier which converts the log ratio voltage to a current which drives the front panel SINAD meter The state of the Meter Peg Off Switch is set by the Controller If the SINAD reading exceeds 18 dB or 24 dB when Special Function 7 1 is invoked the switch is set to peg force off scale the meter If the SINAD measurement mode has not been selected the meter is switched off Special Function 45 1 enables the meter for all ac measurement modes The Voltmeter Input Selector selects one of the dc inputs into the Voltage to Time Converter Ripple Filters on lines from the Input to Output RMS Detectors add low pass filtering to reduce display fluctuation on noisy measurements The output from the Output RMS Average Quasi peak Detector is also heavily filtered by the SINAD Filter in the SINAD measurement mode The output of the selector is the reference input for Comparator The Comparator s other input is a constant slope ramp ramp is initiated by the Controller the ramp rises the Counter counts the time base reference 2 MHz When the ramp vol
136. the SPCL key The Special Function code will appear on the display as it is being entered If a mistake is made during entry of the Special Function code press the CLEAR key and start over When a Special Function is entered the light in the SPCL key will usually go on if it is not already on The readout on the display will depend on the Special Function entered The readout may be a measured quantity an instrument setting or a special code or in some cases the display is unaltered Special Functions can be entered from the HP IB by issuing the Special Function code followed by the code SP or sp The Special Functions are grouped by prefix range as follows 0 Direct Control Special Functions These functions are used for service They halt the functioning of the Controller and configure the instrument hardware as dictated by the suffix All software safeguards are relinquished 1 39 User Special Functions These functions are used during normal instrument operation when a special configuration measurement or information is required Many of the instrument safeguards remain implemented More information on User Special Functions can be found under Special Functions in the Detailed Operating Instructions in Section 3 and on the Operating Information pull out cards SERIAL PREFIX 2742A AND ABOVE Special Function 47 selects either 50 or 600 ohm Source Output Impedance 40 99 Service Special Functions These functions are used to assist in tro
137. the dc level with respect to ground should be within the limits indicated Hint The sensitivity of the rms converter U1 is 1 Vdc Vrms The gain of U17 is determined by R115 and the Gain or Gain 2 resistor of 2 1 or A2A2 respectively FET Q4 is on when filter A2A1 is selected Pin 8 of UIO is a TTL low Switch 4 of U10 is on when filter A2A2 is selected Pin 16 of U10 is a TTL low 8B 22 Model 8903B Service TROUBLESHOOTING SERVICE SHEET 2 Table amp B 19 Level at A2TP2 435 Step 4 Weighting Bandpass Amplitude or High Pass Filter Limits div dc Both Off or None 2 4 to 2 6 HIGH PASS 400 Hz 2 4 to 2 6 CCITT WEIGHTING 2 4 to 2 6 CCIR WEIGHTING 0 9 to 1 1 C Message WEIGHTING 2 4 to 2 6 CCIR ARM WEIGHTING 5 1 to 5 4 A WEIGHTING 3 0 to 3 2 Reduce the oscilloscope s vertical gain by 10 Input Overload Detector Input 1 Unplug the A2A2 assembly if present to gain access to the components beneath Refer to Filter Board Removal in Troubleshooting for Service Sheet 2A 2 On the Audio Analyzer key in 41 0 SPCL to initialize the instrument Set the INPUT and OUTPUT switches to ground Key in AMPTD 1 V Key in 1 11 SPCL to set the input gain to 0 dB Connect the HIGH OUTPUT to the HIGH INPUT 3 Connect a high impedance dc coupled oscilloscope to A2TP3 RMS The dc level should be between 0 9 and 1 1 Vdc Hint If the signal is faulty check the Input Range Detector
138. the solder sucker hit the pad when removing solder Breaking the lead loose can damage the PTH If the lead is attached to the PTH after the solder has been removed reheat the lead to remove it 4 When soldering or desoldering multilead components do not consecutively apply heat to adjacent leads Distribute heat by skipping leads or crossing to opposite side of device 8 16 GENERAL TROUBLESHOOTING Instrument problems usually fall into three general categories operator errors operation out of specification and catastrophic failures The troubleshooting strategy is different for each category 8 17 Operator Errors Apparent failures sometimes can result from using the instrument outside of its range Usually the instrument can sense the condition and will display an error message At other times it cannot such as when it attempts to measure signals with frequencies higher than 100 kHz Consult the Specifications table Table 1 1 and the Detailed Operating Instructions in Section 3 for more detailed information 8 18 Operation Out of Specification The specifications are listed in Table 1 1 Performance tests that can be used to verify the specifications are found in Section 4 If instrument performance is only slightly out of limits it can sometimes be corrected by an adjustment The procedures for adjustments are in Section 5 References listed for each adjustment indicate which service sheet to consult when the adjustment procedure
139. 0 ERREUR 21 20 a 40 lo 60 Lu 5 S 80 z z 100 lt lt E 120 140 160 180 FREQUENCY Hz FREQUENCY Hz Figure 88 4 400 Hz High Pass Filter Figure 8 5 400 Hz High Pass Filter UI Pin U2 Pin 6 8B 25 Service 8903B TROUBLESHOOTING SERVICE SHEETS 2A AND 2B 3i 4 MAC Ta W AMI gf 1 S e e oo LU NL UA e UU LL ML a UE s 20 100 10k 20k 20 100 10k 20k FREQUENCY pm FREQUENCY P Figure 8 6 400 Hz High Pass Filter Figure 8B 7 CCITT Weighting Filter A2TP3 UI Pin 6 eS AT 011111 InN E N Er MAGNITUDE dB MAGNITUDE dB I o EE EN 20 100 10k 20k 20 100 10k 20k FREQUENCY Nu FREQUENCY Hz Figure 8B 8 CCITT Weighting Filter Figure 8B 9 CCITT Weighting Filter UI Pin 7 UI Pin 14 EL Eu DL I LL 111 LAE I Du N LED NI SS N _ L LIH LI LIU Liu Lp ILL SEU ROUTIER UR EATER mL M HELL NI MAGNITUDE 48 MAGNITUDE dB t A o 20 100 1k 1
140. 0 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 Factory Selected Compeouent Refer to Sectioun S Model 8903B Mfr Part Number 1251 0600 1251 0600 1251 0600 1251 0600 1251 0600 1251 0600 TLO72ACJG TLO72ACJG 7812KC 2190 0005 ORDER BY DESCRIPTION 1902 3381 1902 3381 1902 0960 1902 0957 1902 0943 1902 0950 1902 3214 1902 3194 1902 3107 1902 3214 1902 3094 1251 2035 1251 1365 1251 2035 1231 2035 1251 2035 1251 2035 1251 2035 1251 1365 1251 2035 1251 1365 1251 1365 1251 1355 1251 1355 Ernst part change rev IGFEB90 Model 8903B Replaceable Parts Table 6 3 Replaceable Parts Reference HP Part C at D Mfr escription Mfr Part Number Designation Number D y Code A13XA8A 1251 1365 6 CONNECTOR PC EDGE 22 CONT ROW 2 ROWS 28480 1251 1355 A13XABB 1251 1365 6 CONNECTOR PC EDGE 22 CONT ROW 2 ROWS 28480 1251 1365 A13XASA 1251 1365 6 CONNECTOR PC EDGE 22 CONT ROW 2 ROWS 28480 1251 1365 13 98 1251 1365 6 CONNECTOR PC EDGE 22 CONT ROW 2 ROWS 28480 1251 1365 A13XA10 1251 1626 2 1 CONNECTOR PC EDGE 12 CONT ROW 2 ROWS 28480 1251 1626 A13XA11 1251 0472 4 3 CONNECTOR PC EDGE 6 CONT ROW 2 ROWS 28480 1251 0472 A13XA12 1251 0472 4 CONNECTOR PC EDGE 6 CONT ROW 2 ROWS 28480 1251 0472 A13XA12 1251 0472 4 CONNECTOR PC EDGE 6 CONT ROW 2 ROWS 28480 1251 0472 Refer te Section 7 fer lines iuformation Factery Selected Camponeut Refer t
141. 0 1990 1110 0757 0401 0698 3440 0757 0416 0757 0442 0757 0442 1810 0206 1810 0206 3101 0418 1251 0550 1251 0600 18 1 1193 1820 1193 1820 1201 1820 1197 1820 1193 1820 1193 1820 1417 1820 1417 1820 1190 1820 1202 18260 1216 1820 1112 1820 1208 1820 2624 08903 87003 1820 1281 1818 3183 1820 1197 1820 2982 1820 1917 1820 3508 1820 1216 1826 1338 0410 0770 4040 0748 4040 0747 1480 0116 0351 0026 1400 0973 1200 0557 1200 0654 C D Uy UO in aon un o Oo nw c O G UO team On m N O Qty 4 A Table 6 3 Replaceable Parts Description 08903 60300 SERIAL 2948 AND ABOVE LED LAMP LUM INT 1 5MCD IF 15MA MAX LED LAMP LUM INTz 1 5MCD IF 15MA MAX LED LAMP LUM INT 1 5MCD IF 15MA MAX LEO LAMP LUM INTz 1 5MCD iF 15MA MAX RESISTOR 100 1 125W TF TC 0 100 RESISTOR 196 1 125 TF TC 20 100 RESISTOR 511 1 125W TF TC zO 100 RESISTOR 10K 1 125W TF 0 100 RESISTOR 10K 1 125W TF TC 20 100 NETWORK RES 8 SIP 10 0K OHM X 7 NETWORK RES 8 51 10 0K OHM X 7 SWITCH DIP RKR 10 1 30VDC CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ IC CNIR TTL LS BIN ASYNCHRO IC CNTR TTL LS BIN ASYNCHRO GATE LS AND QUAD 2 INP IC GATE TTL 1
142. 0 FROM en LATCH QU AMP 4 12 BAL R71 TP4 BALANCE COMPARATOR N A ARER 6190 3 4 R73 1 3 GO 15 45 F BAL HEB 8 C50 3150 UBB 2450 54 4k OFS 541 0 011 t15V 50 50 mVDC R63 V V R38 NOTE 2 50 TO 50 G gt REF 37 19 6k 6 100K RBS neg 33 R40 2 511 45V F 4 QUADRANT 3 Orn 19 6k r R4B V GAIN SWITCH 45V F T MULTIPLIER 1 v 100 il I Iy 13 7 R78 R80 10 22k 3 n 4 Y Y 15V IF Figure BB 113 SERIAL PREFIX 24504 AVG RMS AVG ZERO AMS ZERO SCALE SCALE TP2 ADJUST ADJUST TP3 TP1 TP11 4 TP5 TPB 2 2 2 2 1 BLACK Q 3 e t gt lt e ALY i m m m m in RF B olo Q9 c c ER ER m c 2 2 gt m D o i e c 2 lt tr a e C e Cr nm m 1 tr uy r gt 0 m m v1 mii u em gt 12 31452 2 gt Pri wri sz C SEE 28 R51 R81 U12 C53 CR14 Ce L2 C43 0 s BB B 000000000000000 A4 Figure 88 114 SERVICE SHEET 5 INFORMATION C26 NN R45 C34 R47 R48 U R33 R34 R35 C18 cas 817 Ria 822 C18 1 C1 Component Locator 913 74 n O
143. 0 0197 8 CAFACITOR FXD 2 2UF 10 20VDC TA 55289 1500225 9020 2 20 0160 4832 4 CAPACITOR FXD 01UF 80 20 100VDC CER 28480 0160 4837 21 0160 4832 4 CAPACITOR FXO O1UF 80 20 100 0 CER 28480 0160 4832 ABC22 0160 4932 4 CAPACITOR FXD 01UF 80 20 100VDC CER 28480 0160 4832 8 23 0160 4832 4 CAPACITOR FXD 01 80 20 100VDC CER 28480 0160 4832 24 0150 4832 4 CAPACITOR FXD O1UF 80 20 100VDC CER 28480 0160 4832 ABC25 0160 4787 8 CAPACITOR FXD 20PF 5 500VDC CER 0 30 28480 0160 4787 ABC26 0160 4787 8 4 CAPACITOR FXD 20PF 5 500VDC CER 0 30 28480 0160 4787 A8C27 0121 0436 4 1 CAPACITOR V TRMR AIR 2 6 23 5PF 350V 74970 189 0509 125 8 28 NOT ASSIGNED 8 29 NOT ASSIGNED NOT ASSIGNED 8 31 ASSIGNED A8C32 NOT ASSIGNED ASC34 NOT ASSIGNED A8C35 NOT ASSIGNED ABC36 NOT ASSIGNED ABC37 0180 1745 4 1 CAPACITOR FXD 1 5UF 10 20VDC TA 56289 1500155 9020 2 A8C38 0160 4832 4 1 CAPACITOR FXD O1UF 10 100VDC 28480 0160 4832 8 44 0180 0197 8 1 CAPACITOR FXD 2 2UF 10 20VDC TA 28480 0180 0197 ABCR 1 1901 0050 3 DIODE SWITCHING 80V 200MA 2NS DO 35 28480 1901 0050 ABCR2 1901 0050 3 DIODE SWITCHING 80V 200MA 2NS DO 35 28480 1901 0050 ABCR3 1901 0050 3 DIODE SWITCHING 80V 200MA 2NS DO 35 28480 1901 0050 A8CR4 1901 0050 3 DIODE SWITCHING 80V 200MA 2NS DO 35 28480 1901 0050 ABCRS 1901 0050 3 DIODE SWITCHING 80V 200MA 2NS DO 35 28480 1901 0050 ABCR6 1901 0050 3 DIODE SWITCHING 80V 200MA 2NS DO 35 2
144. 0 1112 8 ABUA 1820 1417 6 A9US 1820 2740 0 1 ABUS 1820 1905 7 1 ABU 1820 1198 0 2 ASUS 1820 1689 4 2 ASUS 1820 1198 0 A9U10 1820 1689 4 e A9U11 1820 1200 5 2 9012 1820 1172 8 A9U13 1820 1200 5 A9U14 1820 1199 1 A9U15 1820 0054 5 1 A9U16 1820 1216 3 A9U17 1820 1417 6 A8U18 1820 2100 6 1 1200 0654 7 A9U19 1820 1416 5 1 9 20 1820 0621 2 1 TRefer to Section 7 fer update information 6 80 D Qty Table 6 3 Replaceable Parts 08903 60118 SERIAL PREFIX 2450A 2922A ti Mfr Description Code IC FF TTL LS D TYPE POS ENGE TRIG 01295 PROM 1816 0915 28480 FF TTL LS D TYPE POS EDGE TRIG 01295 IC GATE TTL LS NAND QUAD 2 INP 01295 COMPTR TTL LS MAGTD 2 INP 8 BIT 01295 IC GATE TTL LS NOR DUAL amp INP 07263 IC GATE TTL LS NAND QUAD 2 INP 01295 IC UART TTL QUAD 01295 GATE TTL LS QUAD 2 INP 01295 IC UART TTL QUAD O1295 IC INV TTL LS HEX 01295 IC FF TTL LS D TYPE POS EDGE TRIG 01295 IC INV TTL LS HEX 01295 IC INV TTL LS HEX 1 INP 01295 IC GATE TTL NAND QUAD 2 INP 01295 DCDR TTL LS 3 TO 8 LINE 3 INP 01295 IC GATE TTL LS NAND QUAD 2 INP 01295 IC MICPROC ACCESS NMOS DUAL 8 BIT 7263 40 CONT DIP DIP SLDR 28480 IC SCHMITT TRIG TTL LS INV HEX 1 INP 01295 TTL NAND QUAD 2 INP 01295 Factory Selected Component Befer to Section 5 Model 8903B Mfr Part Number SN74LS74AN 08901 80004 SN74LS74AN SN74LS26N SN74LS686N 74LS260PC SN74LSO03N 1
145. 0 1300 HZ 28480 A13L6 9100 3922 4 INDUCTOR FIXED 120 1300 HZ 28480 A13L7 9140 0210 1 INDUCTOR RF CH MLD 100UH 5 166DX 385LG 28480 A13MP1 0403 0285 8 FOOT ADH 12 7 MM WD 28480 1301 1854 0477 7 TRANSISTOR NPN 2N2222A SI TO 18 PD SOOMW 04713 1205 0012 1 1 18 5 28480 A1302 1884 0005 0 1 THYRISTOR SCR VRRM 50 04713 2190 0006 1 WASHER LK NO 6 141 IN ID 28480 2360 0229 1 SCREW MACH 6 32 562 IN LG PAN HD POZI 00000 2420 0002 6 NUT HEX DBL CHAM 6 32 THD 109 IN THK 28480 3050 0227 3 WASHER FL MTLC NO 6 149 IN ID 28480 A1303 1884 0276 7 THYRISTOR TRIAC TO 220AB 28480 2190 0006 1 WASHER LK NO 8 141 IN ID 28480 2360 0229 1 SCREW MACH 6 32 562 IN LG PAN HD POZI 00000 2420 0002 6 NUT HEX DBL CHAM 6 32 THD 109 IN THK 28480 3050 0227 3 WASHER FL MTLC NO 6 149 IN ID 28480 1304 ASSIGNEO 1305 1884 0345 1 THYRISTOR SCR VRRM 400 31585 1306 1884 0345 1 THYRISTOR SCR 400 31585 1307 1854 0477 7 TRANSISTOR NPN 2N2222A 18 500 04712 Refer to Section 7 for information Factory Selected Component Refer to 2 6 96 Model 8908 Mfr Part Number 1901 0033 1901 0033 1901 0033 1901 0033 1901 0159 1901 0159 1801 0159 1901 0159 1901 0159 5082 4984 5082 4984 5082 4984 1251 4735 1251 3412 1251 5169 8159 0005 8159 0005 1251 5169 9100 3922 9100 3922 9100 3922 9100 3922 9100 3922 9140 0210 0403 0
146. 0 7 DIODE GEN PRP 125MA DO 35 28480 1901 0880 A4CR20 1901 0880 7 DIODE GEN PRP 125MA DO 35 28480 1901 0880 A4CR21 1901 0880 7 DIODE GEN PRP 125MA DO 35 28480 1901 0880 A4CR22 1901 0880 7 DIODE GEN PRP 125MA DO 35 28480 1901 0880 A4CR23 1901 0880 7 DIODE GEN PRP 125MA DO 35 28480 1901 0880 A4CR24 1901 0880 7 DIODE GEN PRP 125MA DO 35 28480 1901 0880 4 25 1901 0040 1 DIODE SWITCHING 30V 50 2NS DO 35 28480 1901 0040 2450A TO 2520A A4CR26 1901 0376 6 DIODE GEN PRP 35V 50MA DO 35 28480 1901 0376 2601A AND ABOVE A4CR26 1901 0880 7 DIODE GEN PRP 125MA DO 35 28480 1901 0880 AACR27 1901 0050 3 DIODE SWITCHING 80V 200MA 2NS DO 35 28480 1901 0050 AACR28 1901 0050 3 DIODE SWITCHING 80V 200MA 2NS DO 35 28480 1901 0050 A4K1 0490 1423 2 1 RELAY REED 1C 250MA 28VDC 5VDC COIL 3VA 28480 0490 1423 411 9140 0210 1 10 INDUCTOR RF CH MLD 100UH 5 166DX 385LG 28480 9140 0210 412 9140 0210 1 INDUCTOR RF CH MLD 100UH 5 166DX 385LG 28480 9140 0210 413 9100 0539 3 3 INDUCTOR MISC ITEM 28480 9100 0539 AALA 9100 0539 3 INDUCTOR MISC ITEM 28480 9100 0539 415 9100 0539 3 INDUCTOR MISC ITEM 28480 9100 0539 AAMP1 4040 0748 3 EXTR PC BD BLK POLYC 062 BD THKNS 28480 4040 0748 1480 0116 8 PIN GRV 062 IN DIA 25 IN LG STL 28480 1480 0116 AAMP2 4040 0752 9 1 EXTR PC BD YEL POLYC 062 BD THKNS 28480 4040 0752 1480 0116 8 PIN GRV 062 IN DIA 25 IN LG STL 28480 1480 0116 AAMP3 0403 0026 6 PLUG HOLE BDR HD FOR 187 D HOLE NYL 02768 207 120241 03 0101 4012 08903 8
147. 0 kHz The amplitude display should be 0 0196 or less Hint See the hint for step 21 8B 38 Model 8903 Service PRINCIPLES OF OPERATION SERVICE SHEET 5 SERVICE SHEET 5 A4 Output Amplifier Voltmeter Assembly Output Amplifier PRINCIPLES OF OPERATION General This portion of the Output Amplifier Voltmeter A4 contains the output amplifier circuitry The output from the Notch Filter is amplified attenuated and filtered as necessary to obtain a proper output reading by the Output RMS Average Detector see Service Sheet 6 The ac output of the amplifier is available at the rear panel MONITOR output connector Attenuators and Amplifiers Attenuators and 2 can each be set for an attenuation of 0 or 20 dB They are switched together The attenuator control line OU AMPI switches in the 0 dB path of Attenuators 1 and 2 indirectly through U21D which acts as an isolating switch and a logic inverter When the control input F4 to U2ID is high U21D is off F1 of U21A and of U7C are pulled to ground via R11 and the respective switches are enabled When F4 of U2ID is low U2ID is on resistors R2 R5 and R11 form a voltage divider which applies a logical high to of U21A and F3 of U7C and the respective switches are disabled Amplifier 1 has a fixed gain of 5 Amplifiers 3 4 each have a fixed gain of 10 The Output Clamp in Amplifiers 3 and 4 accesses the driver stage of the respective IC and prevents the ou
148. 0049 0160 4834 0160 4795 0160 4832 0160 4832 0160 4832 0160 4832 0160 4590 0160 5032 0160 3293 0160 3918 0160 4795 0160 4832 0160 4832 0160 4795 0160 4832 0160 4832 0160 4791 0160 4832 0160 4832 0160 4590 0160 5032 0160 3293 0160 3918 0180 0374 0180 0094 0160 4832 0160 4832 0160 4832 0160 4832 0160 4814 0160 4795 0160 4832 0160 4832 0160 4807 0160 4807 0160 5550 0160 5527 0160 4832 0160 4832 0160 3510 gt gt 5h amp amp NARA 5 OQ Qo amp OM Qty tRefer to Section 7 for update information rev 20JUN9 I Table 6 3 Replaceable Parts Description NOTCH FILTER ASSEMBLY CAPACITOR FXD 047UF 10 100VDC CER CAPACITOR FXD 20UF 75 10 50VDC AL CAPACITOR FXD 20UF 75 1096 50VDC AL CAPACITOR FXD 047UF 10 100VDC CER CAPACITOR FXD 4 7PF 5 100VDC CER CAPACITOR FXD 01UF 10 100VDC CER CAPACITOR FXD 01UF 10 100VDC CER NOT ASSIGNED CAPACITOR FXD 01UF 10 100VDC CER CAPACITOR FXD 01UF 10 100VDC CER CAPACITOR FXD 18UF 1 200VDC CAPACITOR FXD 0223UF 1 200VDC CAPACITOR FXD 2470PF 1 100VDC MICA CAPACITOR FXD 355PF 1 100VDC MICA CAPACITOR FXD 4 7PF 5PF 100VDC CER CAPACITOR FXD 01UF 10 100VDC CER CAPACITOR FXD 01UF 10 100VDC CER CAPACITOR FXD 4 7PF 5 100VDC CER CAPACITOR FXD 01UF 10 100VDC CER CAPACITOR FXD 010 10 100VDC CE
149. 0069 3 2 TRANSISTOR DUAL NPN 71 PD 500MW 28480 08903 80069 1205 0202 1 2 THERMAL LINK DUAL TO 18 CS 28480 1205 0202 402 1854 0753 2 TRANSISTOR DUAL NPN 71 PD 500 28480 1854 0753 1205 0202 1 THERMAL LINK DUAL 18 5 28480 1205 0202 403 1855 0420 2 36 TRANSISTOR J FET 244391 N CHAN D MODE 01295 2N4391 A4Q4 1854 0830 6 1 TRANSISTOR DUAL NPN PD 500MW 27014 LM394 tRefer to Section 7 for update information rev 20JUN91 Factory Selected Component Refer to Section 5 A Errata part change 6 37 Replaceable Parts Model 8903B Table 6 3 Replaceable Parts Reference HP Part C Q Mfr ty Description Mfr Part Number Designation Number D P Code A4Q5 1855 0420 2 TRANSISTOR J FET 2N4391 N CHAN O MODE 01295 2N4391 406 1855 0420 2 TRANSISTOR J FET 234391 N CHAN D MODE 01295 2 4391 A4Q7 1855 0420 2 TRANSISTOR J FET 244391 N CHAN D MODE 01295 2N4391 408 1855 0420 2 TRANSISTOR J FET 234391 N CHAN D MODE 01295 2N4391 A4Q9 1855 0420 2 TRANSISTOR J FET 244391 N CHAN D MODE 01295 2N4391 4010 1854 0071 7 1 TRANSISTOR NPN S PD 300MW 2200MHZ 28480 1854 0071 4011 1853 0281 9 4 TRANSISTOR PNP 2N2907A SI TO 18 400 04713 2 2907 A4Q12 1853 0281 9 TRANSISTOR PNP 2N2907A Si TO 18 400MW 04713 2N2907A AA4R1 0757 0279 RESISTOR 3 16 1 125W 0 100 24546 4 1 8 0 3161 A4F2 0757 0441 8 RESISTOR 8 25K 1 125W 0 100 24546 4 1 8 0 8251 ASRS 0698 6343 5 RESISTOR 9K 1 125W F
150. 0160 4793 0160 3324 0160 4799 150D606X98006B2 1500335 9010 2 0160 3324 0160 4805 0160 4805 0160 4835 0160 4835 0160 4382 0160 4799 1500606 900682 0160 4835 0160 4835 0160 2236 150D107X9010R2 0160 4805 0160 4793 Errata part change 6 43 Qty Replaceable Parts Reference HP Part C Designation Number D A4 4 41 0160 4814 2 A4CA2 0160 4810 8 A4C43 0160 4835 7 4 44 0160 4835 7 4 45 0180 0291 3 4 46 0160 4835 7 4 47 0160 4805 1 4 48 0160 4835 A4CA9 0160 4835 7 4 50 0160 4799 2 4 51 0180 1746 5 4 52 0160 4814 2 4 53 0160 3324 7 4 54 0160 4835 7 4 55 0160 4835 7 4 56 0160 4653 7 A4CS7 0160 4835 7 4 58 0160 4814 2 4 59 0160 4653 7 A4C80 0160 4653 7 4 61 0160 4653 7 4 62 0160 4653 7 A4063 0160 4653 7 4 64 0160 4843 7 4 65 0180 0228 6 4 66 0180 0228 6 4 67 0180 0228 6 4 68 0180 2206 4 A4C89 0160 4807 3 A4C70 0160 4397 6 4 71 0180 0291 3 4 72 0160 5254 6 4 73 0160 4832 4 A4C74 0160 4832 4 4 75 0160 4797 0 4 76 0160 4835 7 4 77 0160 4790 3 4 7 0160 4590 1 4 79 0160 5622 2 A4CR 1901 6050 3 A2CR2 1901 0050 3 A4CR3 1901 0040 1 A4CR4 1901 0050 3 A4CRS 1901 0050 3 A4CRE 1901 0880 7 A4CR7 1901 0050 3 A4CR8 1901 0050 3 A4CR9 1901 0050 3 A4CR10 1901 0518 8 A4CR11 1901 0518 8 A4CR12 1901 0040 1 A4CR13 1901 0050 3 4 14 1901 0040 1 AACR15 1901 0040 1 Refer te Section 7 for update information 6 44
151. 0160 4832 A6C34 0180 1794 3 CAPACITOR FXD 22UF 10 35VDC 56289 150D225X9035R2 A6C35 0160 4832 4 CAPACITOR FXO 01UF 10 100VDC CER 28480 0160 4832 6 36 0180 1794 3 CAPACITOR FXD 22UF 10 35VDC TA 56289 150D226X9035H2 A6C37 0160 4832 4 CAPACITOR FXD 010 10 100VDC CER 28480 0160 4832 A6C38 0180 1794 3 CAPACITOR FXD 22UF 10 35VDC 56289 150D226X9035R2 A6C39 0160 4832 4 CAPACITOR FXD 01UF 10 100VDC CER 28480 0160 4832 6 40 0150 3465 8 CAPACITOR FXD 100PF 4 10 1 CER 28480 0160 3486 6 41 0160 3466 8 CAPACITOR FXD 100PF 10 e 1KVDC CER 28480 0160 3466 AGCR1 19901 0050 3 DISDE SWITCHING 80V 200 2NS DO 35 28480 1901 0050 A6CR2 1901 0050 3 DIODE SWITCHING 80V 200MA 2NS DO 35 28480 1901 0050 A6CR3 NOT ASSIGNED A6CR4 1901 0880 7 DIODE GEN PRP 125MA DO 35 03406 1901 0880 6 5 1901 0880 7 DIODE GEN PRP 125 00 35 03406 1901 0880 tRefer te Section 7 for update information Factory Selected Campoanent Refer to Section 5 Errata part change rev 16FEB90 6 59 Replaceable Parts Reference HP Part Designation Number A6CRE 1901 0880 7 A6CR7 1901 0880 7 A6CR8 1901 0873 8 4 A6CR9 1901 0873 8 A8CR10 1901 0873 8 A6CR11 1901 0873 8 A6CR12 1901 0050 3 A6CR13 1901 0050 3 A6CR14 1901 0050 3 2450 2520A AGCR15 1901 0376 6 AGCRIG 1901 0376 6 6 17 1901 0376 6 ACRIS 1901 0376 6 A6CHRI 1901 0376 6 A6CR20 1801 0376 6 A60CH21 1901 0376 6 A6CTI22 1901 0376 6
152. 02 MP7 08903 60158 7 1 COVER CARD CAGE 28480 08903 60156 2450A 2730A MP8 STD 08903 00034 FRONT PANEL STANDARD 28480 08903 00034 MP8 001 08903 00055 FRONT PANEL OPTION 001 ONLY 28480 08903 00055 2742 2908 8 STD NO LONGER AVAILABLE SEE SECTION 7 MP8 001 1 NO LONGER AVAILABLE SEE SECTION 7 2910A AND ABOVE MP8 08903 00145 8 1 FRONT PANEL STANDARD 28480 08903 00145 MP8 08903 00146 9 1 FRONT PANEL OPTION 001 ONLY 28480 08903 00146 2450 2730 MP9 08903 00110 6 1 SUB PANEL 28480 08903 00110 0515 1227 8 8 SCREW MACH M3 X 0 5 6MM LG 90 DEG FLH HD 28480 0515 1227 ATTACH SUB PANEL TO FRONT FRAME 05151955 4 SCREW MACH M3 X 0 5 8MM LG PNTX 00000 ORDER BY DESCRIPTION ATTACHES GROUND LUG TO SUB PANEL 1400 0519 7 CLAMP HOSE 1 313 2 25 DIA 562 WD SST 28480 1400 0519 2742A AND ABOVE MP9 08903 00135 6 1 SUB PANEL 28480 08903 00135 051512278 6 SCREW MACH M3 X 0 5 6MM LG 90 DEG FLH HD 28480 0515 1227 ATTACH SUB PANEL TO FRONT FRAME 0515 1950 4 SCREW MACH M3 X 0 5 8MM LG PNTX 00000 ORDER BY DESCRIPTION ATTACH KEYBOARD TO SUB PANEL 1400 0519 7 CLAMP HOSE 1 313 2 25 DIA 562 WD SST 28480 1400 0519 2450A TO 2908A MP10 NO LONGER AVAILABLE SEE SECTION 7 MPH NO LONGER AVAILABLE SEE SECTION 7 MP12 NO LONGER AVAILABLE SEE SECTION 7 MP13 NO LONGER AVAILABLE SEE SECTION 7 MP14 NO LONGER AVAILABLE SEE SECTION 7 15 NO LONGER AVAILABLE SEE SECTION 7 MPI6 NO LONGER AVAILABLE SEE SECTION 7
153. 0438 0757 0442 0757 0442 0757 0438 0757 0442 0757 0465 0757 0280 0757 0465 0698 0084 0698 0084 0698 6360 0698 5360 0598 3160 0757 0455 0698 3200 0757 0279 0757 0458 0698 3245 0757 0442 0698 3454 0757 0465 2100 3355 2100 3355 0698 3453 0698 3453 0757 0416 0757 0416 0757 0415 0757 9416 0757 0290 0757 0290 0757 0279 0757 0279 0757 0439 C 3 O m 00 0 O0 o gt WwW O Q O GO GO Q tO WG PD IN m Oo O N i A thtefer to Section 7 fer update information 6 32 Tuble 6 3 Replaceable Parts Description RESISTOR 15 98K 1 125W F 0 25 RESISTOR 32K 1 125W F 0 25 RESISTOR 84K 1 125W F TC 0 25 RESISTOR 128K 1 125W F TC 0 25 RESISTOR 256K 1 125W F 0 25 RESISTOR 511K 1 125W F 0 100 RESISTOR 1M 1 125W F 0 100 RESISTOR 1K 1 125W F 0 100 RESISTOR 1K 1 125W F TC 0 100 RESISTOR 10K 1 125W F 0 100 RESISTOR 1K 1 125W F TC 0 100 RESISTOR 19 6K 1 125W F 0 100 RESISTOR 19 6K 1 125W F TC 0 100 RESISTOR 19 6K 1 125W F 0 100 RESISTOR 19 6K 1 125W F 0 100 RESISTOR 5 11K 1 125W F TC 0 100 RESISTOR 10K 1 125W 0 100 RESISTOR 10K 1 125W 0 100 RESISTOR 5 11K 1 t25W TC 0 100 RESISTOR 10K 1 125W 0 100 RESISTOR 100K 1 125W 0 100 RESISTOR 1K 1 125W F 0 100 RESISTOR 100K 1
154. 05W F 0 100 24546 RESISTOR 5 11K 1 05W F 0 100 24546 RESISTOR 42 2K 1 05W 0 100 24546 RESISTOR 133K 1 05W 0 100 24546 RESISTOR 147K 1 OSW F 0 100 24346 RESISTOR 21 5 1 05W TC 0 4 100 24546 RESISTOR 21 5 1 05W F 0 100 24546 RESISTOR 21 5K 1 05W F 0 100 24546 LOW BIAS H IMPD QUAD 14 DIP P 01295 Factory Selected Camponent Refer to 5 Replaceable Parts Mfr Part Number 08903 60161 08903 60161 0160 6326 0160 6324 0160 0578 0160 0578 0160 0578 0160 0578 D1R0GS 1 5 D1ROGS1A50K 1251 6063 C3 1 8e TO 1212 F C3 1 8 TO 133R F 2100 3351 3 1 8 70 1961 C3 1 8 T0 7501 F C3 1 8 TO 562 1 F C3 1 8 TO 1002 F 3 1 8 0 4641 3 1 8 0 5111 C3 1 8 T0 4222 F 3 1 8 0 1333 3 1 8 0 1473 C3 1 8 TO 21R5 F C3 1 8 TO 21R5 F 3 1 8 70 2152 TL7LO4C40 A Errata part change 6 27 Model 8908 Reference Designation A3 A3 1 2 4 5 6 A3C7 A3C8 10 11 A3C12 1 14 15 16 17 18 19 20 21 22 23 24 25 A3C26 A3C27 A3C28 A3C29 A3C30 A3C31 A3C32 A3C34 A3C35 A3C36 A3C37 A3C38 9 40 412 42 A3C43 A3C44 45 Number 08903 60163 0160 4824 0180 0049 0180
155. 096 35VDC TA 56289 150D685X9035B2 A13C11 0180 0197 B CAPACITOR FXD 2 2UF 1096 20VDC 56289 150D225X9020A2 A13C12 0160 0576 5 1 CAPACITOR FXD 1UF 20 50VDC CER 28480 0160 0576 A13C13 0160 2307 4 CAPACITOF FXD 47PF 5 300VDC 28480 0160 2307 A13C14 0160 2307 4 47PF 5 300VDC MICA 28480 0160 2307 13 15 0160 2307 4 CAPACITOR FXD 47PF 5 300VDC MICA 28480 0160 2307 A13C16 0160 2307 4 CAPACITOR FXD 47PF 5 300VDC MICA 28480 0160 2307 A13C17 0160 4805 1 CAPACITOF FXD 47PF 5 100VDC CER 0 30 28480 0160 4805 A13C18 0160 5469 5 3 CAPACITOR FXD 1UF 10 50VDC 28480 0160 5469 A13C19 0160 5469 5 CAPACITOR FXD 1UF 10 50VDC 28480 0160 5469 A13C20 0160 5469 5 CAPACITOF FXD 1UF 10 50VDC 28480 0160 5469 A19CR1 1901 0200 5 4 DIODE PWR RECT 100V 1 5A 28480 1901 0200 A13CR2 1901 0200 5 DIODE PWR RECT 100V 1 5A 28480 1901 0200 A13CR3 1901 0200 5 DIODE PWR RECT 100V 1 5A 28480 1901 0200 A13CR4 19010200 5 DIODE PWR RECT 100V 1 5A 28480 1901 0200 A13CR5 1906 0231 2 1 DIODE CT RECT 200V 15A 28480 1906 0231 1200 0043 8 4 INSULATOR XSTR ALUMINUM 28480 1200 0043 1205 0021 2 1 HEAT SINK TO 3 CS 28480 1205 0021 2190 0018 5 WASHEF LK HLCL NO 6 141 IN ID 04604 2190 0018 2360 0229 1 2 SCREW MACH 6 32 5624N LG PAN HD POZ 00000 ORDER BY DESCRIPTION 2420 0003 7 4 NUT HEX DBL CHAM 6 32 THD 094 IN THK 04939 2420 0003 3050 0010 2 WASHER FL MTLC NO 6 147 IN ID 04719 65 A Errata part change 6 95 Replaceable Parts Table
156. 0k 20k 20 100 1k 10k 20k FREQUENCY H2 FREQUENCY Hz Figure 88 10 CCITT Weighting Filter Figure 8B 11 CCITT Weighting Filter UI Pin amp A2TP3 8 26 8903 MAGNITUDE 48 MAGNITUDE 48 MAGNITUDE 98 Service TROUBLESHOOTING SERVICE SHEETS 2A AND 2B FREQUENCY H1 Figure 6D 12 C Message Weighting Filter Ul Pin I 10k 20k FREQUENCY Hz Figure 8 14 C Message Weighting Filter Ul Pin 14 FREQUENCY Hz Figure 8B 16 C Message Weighting Filter 2 3 MAGNITUDE dB MAGNITUDE dB MAGNITUDE dB 10k 20k FREQUENCY Hz Figure 6B 13 C Message Weighting Filter Pin 7 ant mm 10k 20k FREQUENCY Hz Figure 8 15 C Message Weighting Filter UI Pin 8 10k 20 FREQUENCY Hz Figure 8B 17 A Weighting Filter Pin 3 8B 27 Service Model 8903B TROUBLESHOOTING SERVICE SHEETS 2A AND 2B MAGNITUDE dB MAGNITUDE dB 20 100 1k 10k 20k 20 100 1k 10k 20k FREQUENCY Hz FREQUENCY Hz Figure SB 18 A Weighting Filter li
157. 1 125W F 1 0 100 28480 RESISTOR 6 81 1 125W F TC 0 100 28480 RESISTOR 2 15K 1 125W 0 100 24546 RESISTOR 7 5 1 125W F 0 100 24546 RESISTOR 10K 1 125W 0 100 24546 RESISTOR 10K 1 125W 0 100 24546 RESISTOR 5 11 1 125W TC 0 100 24545 RESISTOR 19 6K 1 125W F TC 04 100 24540 RESISTOR 1K 1 125W 0 100 24546 RESISTOR T RMR 50K 10 C SIDE ADJ 17 TRN 02111 RESISTOR 1 24K 1 125W 0 100 24546 RESISTOR 383K 1 125W TC x0 4 100 28480 RESISTOR 1K 1 125W F 0 100 24546 RESISTOR 5 11K 1 125W 0 100 24546 RESISTOR 37 68K 1 25W 0 25 28480 RESISTOR TRMR 5K 10 C SIDE ADJ 17 TRN 02111 Factory Selected tiomponent Refer to Section 5 Replaceable Parts Mfr Part Number 4 1 8 0 2871 C4 1 8 TO 1622 F C4 1 8 TO 287 1 F 0698 6343 0698 6362 4 1 8 0 909 0698 6343 0698 6343 0698 6362 0698 6362 C4 1 8 TO 1001 F 0699 0550 4 1 8 0 2611 0698 6360 4 1 8 0 3162 4 1 8 0 3162 4 1 8 70 1001 4 1 8 0 5111 4 1 8 0 1002 4 1 8 10 3481 0698 6350 0698 8822 4 1 8 70 1003 C4 1 6 TO 5111 F C4 1 8 TO 237 1 F 4 1 8 0 3831 4 1 8 0 301 C4 1 8 T0 3161 F 0698 6630 0698 6350 4 1 8 0 1471 4 1 8 10 1782 4 1 8 0 1471 4 1 8 70 101 0698 8822 0698 8822 4 1 8 0 2151 C4 1 8 TO 750 1 F 4 1 8 0 1002 4 1 8 0 1002 C4 1 8 TO b1
158. 1 1 F 4 1 8 0 1962 C4 1 8 TO 1001 F 43P502 4 1 8 0 1241 0698 3459 4 1 8 0 1001 4 178 0 5111 0699 0526 43 502 A Errata part change 6 39 Replaceable Parts Model 8903B Table 6 3 Replaceable Parts Reference HP Part Designation N mber D Qty Description Code Mfr Part Number A4 08903 60128 SERIAL PREFIX 2450A TO 2720A HP8903B A4F92 0698 8799 9 1 RESISTOR 21 5K 1 125W 0 25 28480 0698 8799 A4F93 2100 3109 2 1 RESISTOR TRMR 2K 10 C SIDE ADJ 17 TRN 02111 43P202 4994 0698 3266 5 2 RESISTOR 237K 1 125W 0 100 24546 4 1 8 0 2373 A4R95 0696 6630 3 RESISTOR 20K 1 125W TC 0 25 28480 0698 6630 A4F96 0698 3266 5 RESISTOR 237K 1 125W F TC 0 100 24546 C4 1 8 T0 2373 F A4F97 0757 0438 3 RESISTOR 5 11 1 125W F TC 0 100 24546 C4 1 8 T0 5111 F A4F98 0698 6630 3 RESISTOR 20K 1 125W F TC 0 25 28480 0698 6630 A4F99 0757 0280 3 RESISTOR 1K 1 125W TC 0 100 24546 C4 1 8 TO 1001 F A4R100 0757 0442 RESISTOR 10K 1 125 0 100 24546 C4 1 8 TO 1002 F A4R101 0698 3243 8 1 RESISTOR 178K 1 125W F TC 0 100 24546 C4 1 8 TO 1783 F 4 102 ASSIGNED A4R103 NOT ASSIGNED A4R104 0757 0470 3 RESISTOR 162K 1 125W F TC 0 100 24546 4 1 8 1623 A4R105 0757 0200 7 RESISTOR 5 62 1 125W F TC 0 100 24546 4 1 8 5621 A4R106 NOT ASSIGNED A4R107 0757 0464 5 2 RESISTOR 90 9K 1 125W F TC 0 100 24546 C4 1 8 TO 9092 F A4R108 0698 3
159. 1 8 TO 196R F CT4 1 B TO S11R F C14 1 8 TO 1002 F CT4 1 8 T0 1002 750 81 750 61 76956 1051 94 125 1010 01 03 00 94 155 1010 01 03 00 47415197 SN741 S197N SN74LS0eM SN74LS00N SN74LS 197N SN74LS197N SN74 S268 SN741I S25N SN74LS OAN SN74ALStON SN741 S 139N SN74L974AH SN74LS3ZN MC68BOSP 03903 87003 4741 5139 6264 15 4741 SOON MC58821P SN74LS240N SN74ASUDAN SN74LS 138N 11 7705 020 1746 0 4040 0748 4040 0747 GP24 063 X 250 17 0361 0026 5180 1 8728 01 C8740 01 Errats part clause rcv 1G EB90 Model 8903 Table 6 3 Replaceable Parts Reference HP Part C Q D Mfr escription Designation Number D ty P Code A9 08903 60118 1 1 REMOTE INTERFACE ASSEMBLY 28480 A9C1 0180 0374 3 CAPACITOR FXD 10UF 10 20VDC TA 56289 A9C2 0180 0229 7 CAPACITOR FXD 33UF 10 10VDC TA 56289 0160 2055 9 CAPACITOR FXD 01 80 20 100VDC CER 28480 0180 0197 8 CAPACITOR FXD 2 2UF 10 20VDC TA 56289 9 5 0150 2055 9 CAPACITOR FXD 01UF 80 20 100VDC CER 28480 AOCS 0160 2055 9 01UF 80 20 100VDC CER 28480 A9C7 0160 2055 9 CAPACITOR FXO 01UF 80 20 100 CER 28480 0160 2055 9 CAPACITOR FXD O1UF 80 20 100VDC CER 28480 ASCE 0160 2055 9 CAPACITOR FXD 010 80 20 100 CER 28480 A9C10 0160 2055 9 CAPACITOR FXD O1UF 80 20 100VDC CER 28480 9 11 0160 2055 9 CAPACITOR FXD O1UF 80 20 100VDC CER 29480 9
160. 12 0160 2055 9 CAPACITOR FXD 01UF 80 20 100VDC CER 28480 A9C13 0160 2055 9 CAPACITOR FXD 01UF 80 20 100VDC CER 28480 9 14 0160 2055 9 CAPACITOR FXD 01UF 480 20 100VDC CER 28480 9 15 0160 2055 9 CAPACITOR FXD 01UF 80 20 100VDC CER 28480 9 16 0160 2055 9 CAPACITOR FXD 01UF 80 20 100VDC CER 28480 9 17 0160 0574 3 2 CAPACITOR FXD 0220 20 100VDC CER 28480 A9C18 0140 0196 3 1 CAPACITOR FXD 150PF 5 300VDC MICA 72136 ASC19 0160 0574 3 CAPACITOR FXD 0220 20 100VDC CER 28480 A9CR1 1901 0518 DIODE SM SIG SCHOTTKY 28480 A9MP1 4040 0748 3 EXTR PC BD BLK POLYC 062 BD THKNS 28480 1480 0116 8 PIN GRV 052 IN DIA 25 IN LG STL 28480 2 4040 0756 3 1 EXTR PC BD WHT POLYC 062 BD THKNS 28480 1480 0116 8 PIN GRV 062 IN DIA 25 IN LG STL 28480 A9R1 0698 3444 1 RESISTOR 316 1 125W F TC 0 100 24546 A9R2 1810 0206 8 NETWORK RES 8 10 0 OHM X 7 01121 A9R3 1810 0206 8 NETWORK RES 8 SIP10 0K OHM X 7 01121 4 9 4 0698 0084 9 RESISTOR 2 15K 1 125W 0 100 24546 ASRS 0757 0416 7 RESISTOR 511 1 125W F TC 0 100 24546 A9R6 1810 0156 3 1 NETWORK RES 10 SIP MULTI VALUE 28480 ASR7 0596 0083 8 RESISTOR 196K 1 125W TC 0 100 24546 A9RS 0698 3444 1 RESISTOR 316 1 125W TC 0 100 24546 ASRS 0757 0442 9 RESISTOR 10K 1 125W F TC 204 100 24546 A9S1 3101 1973 7 I SWITCH SL 7 1 DIP SLIDE ASSY 1A 50VDC 28480 1200 0485 2 1 SOCKET IC 14 CONT DIP SLDR 28480 ASTP1 1251 0600 0 CONNECTOR SGL CONT PIN 1 14 MM
161. 121 4953 7120 4205 7120 591 1 7120 8138 ORDER DESCRIPTION 2190 0068 2190 0102 ORDER By DESCRIPTION 1250 2164 A Errata part change 6 103 tRefer to Section 7 for update information 6 104 Factory Selected Component Refer to Section 5 Replaceable Parts Model 8903B Table 6 3 Replaceable Parts Reference HP Part C Mfr Designation Number D Qty Description Code Mfr Part Number Q1 1854 0669 9 1 TRANSISTOR NPN 2N6057 SI PD 150W 04713 2N6057 08640 20057 5 4 INSULATOR SPACER 28480 08640 20057 1200 0043 8 INSULATOR XSTR ALUMINUM 28480 1200 0043 0624 0459 7 3 SCREW TPG 6 20 75 IN LG 21 STL 00000 ORDER BY DESCRIPTION 2190 0018 WASHER LK HLCL NO 6 141 IN ID 28480 2190 0018 S1 3101 2080 9 2 SWITCH POWER P O W6 28480 3101 2080 08903 20055 1 2 NUT 28480 08903 20055 5041 1418 9 2 CAP ROCKER SWITCH 28480 5041 1418 52 3101 1903 3 6 SWITCH OUTPUT FLOAT 28480 3101 1903 08640 40052 2 18 LEVER SLIDE SWITCH 28480 08640 40052 0515 0365 3 6 SCREW MACH ASSY M2 X 0 4 4 00000 0515 0365 0515 0374 4 6 SCREW MACH ASSY M3 X 0 5 10MM LG 00000 ORDER BY DESCRIPTION S3 3101 1903 3 SWITCH INPUT FLOAT 28480 3101 1903 08640 40052 2 LEVER SLIDE SWITCH 28480 08640 40052 0515 0365 3 6 SCREW MACH ASSY 2 X 0 4 4MM LG 00000 ORDER BY DESCRIPTION 0515 0374 4 6 SCREW MACH ASSY M3 X 0 5 10MM LG 00000 ORDER BY DESCRIPTION 2450A TO 2730A S4 3101 1903 3 SWITCH OUTPUT IMPEDENCE 28480 3101 1903 08
162. 1295 SN74LS259N 1021 1820 1729 3 IC LCH TTL LS CLEAR 8 BIT 075 SN74LS259N A1U22 1826 0412 1 1 COMPARATOR PRCN DUAL 8 DIP P PKG 27014 LM393N A1U23 1820 1144 6 1 GATE TTL LS NOR QUAD 2 INP 01 95 SN74LS02N 1024 1820 1417 6 2 GATE TTL LS NAND QUAD 2 INP 01295 SN74LS26N A1U25 1820 1417 6 IC GATE TTL LS NAND QUAD 2 INP 01275 SN74LS26N A1U26 1820 1729 3 IC LCH TTL LS COM CLEAR 8 BIT 01295 SN74LS259N A1U27 1820 1729 3 IC LCH TTL LS COM CLEAR 8 BIT 012 5 SN74LS259N 1028 1820 1216 3 e DCDR TTL LS 3 TO 8 LINE SINP 01295 SN74LS138N A1U29 1820 1216 3 DCDR TTL LS 3 TO 8 LINE 3 INP 01295 SN74LS138N A1U30 1820 1427 8 1 DCDR TTL LS 2 TO 4 LINE DUAL 2 INP 01295 SN74LS156N Refer te Section 7 fer update information Factory Sclected Component Refer to Section 2 A Errata part change 16 90 6 7 Model 8903 Replaceable Parts Table 6 3 Replaceable Parts Designation Number D Code A2 08903 60170 5 1 INPUT AMPLIFIER ASSEMBLY 28480 08903 60170 INCLUDES A2W3 A2W4 DOES NOT INCLUDE A2A1 OR A2A2 A2 08903 69170 3 1 INPUT AMPLIFIER ASSEMBLY RESTORED 28480 08903 69170 2 1 0180 2195 0 2 CAPACITOR FXD 15UF 10 35VDC 56289 1500156X9035R2 2 2 0160 6370 9 2 C MPE 1 50 600 28480 0160 6370 A2C3 0121 0422 8 4 CAPACITOR V TRMP PSTN 8 4 5PF 1250V 18736 TP5G 0340 0569 9 4 INSULATOR XSTR SLBL ORG POLYM 28480 0340 0669 2 4 0160 2265 3 CAPACITOR FXD 22PF 5 500VDC CER 0 30 28480 0160 2265 2
163. 13VR1 1902 3381 A13VR2 1902 3381 A13VR3 1902 0960 A13VR4 A13VR5 1902 0943 A13VR6 1902 0960 A13VR7 1902 3214 A13VR8 A13VR9 1902 3107 A13VR10 1902 3214 A13VR11 1902 3094 A13XA2A 1251 2035 A13XA2B 1252 4187 A13XA3A 1251 2035 A13XA3B 1251 2035 A13XA4A 1251 2035 A13XA4B 1251 2035 A13XA5A 1251 2035 A13XA5B 1252 4187 A13XA6A 1251 2035 A13XA6B 1252 4187 A13XA7A 1252 4187 A13XA7B 1252 4187 A13XA7C 1252 4187 A13XA8A 1252 4187 A13XABB 1252 4187 A13XA9A 1252 4187 A13XA982 1252 4187 A13XA10 1251 1626 A13XA11 1251 0472 A13XA12 1251 0472 A13XA12 1251 0472 C D C f Qty tRefer to Section 7 for update information 6 98 Table 6 3 Replaceable Parts Description 08903 60392 SERIAL PREFIX 2948A AND ABOVE CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ NOT ASSIGNED CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ AMP LOW BIAS HIMPD DUAL I DIP C NOT ASSIGNED WASHER LK HLCL NO 6 141 IN ID SCREW MACH 6 32 562 IN LG PAN HD POZI DIODE ZNR 68 1V 5 DO 7 PD 4W TC 4 07996 DIODE ZNR 68 1V 5 DO 7 PD 4W 4 07996 DIODE ZNR 12V 5 DO 35 PD 4W TC 077 NOT ASSIGNED DIODE ZNR 2 4V 5 DO 35 PD 4W 037 DIODE ZNR 12V 5 DO 35 PD 4W TC 077 DIODE ZNR 16 2V 2 DO 35 PD 4W NOT ASSI
164. 14 0160 4810 0160 4835 0160 4835 0180 0291 D 3 m O O Ou om Q Co Ch i L oco Q O0 Qty 1 VaN A Refer to Section 7 fer update infermation rev 1GFEBIO Table 6 3 Replaccable Parts Description OUTPUT AMPLIFIERVOLTMETER ASSEMBLY CAPACITOR FXD 100UF 10 10VDC TA CAPACITOR FXD 4 7UF 10 35VDC TA CAPACITOR FXD 10UF 10 20VDC TA CAPACITOR FXD 4 7UF 10 35VDC CAPACITOR FXD 1UF 10 35VDC CAPACITOR FXD 1UF 10 35VDC TA CAPACITOR FXD 1UF 10 35VDC TA CAPACITOR FXD 1UF 10 35VDC CAPACITOR FXD 47PF 5 100VDC CER 04 30 CAPACITOR FXD 1PF 25PF 500VDC CER CAPACITOR FXD 10UF 10 20VDC CAPACITOR FXD 47UF 80 20 50VDC CER CAPACITOR FXD 1300PF 1 SOVDC CER CAPACITOR FXD 3000PF 5 5OVDC CER CAPACITOR FXD 100PF 1 300VDC MICA CAPACITOR FXD 270PF 1 300VDC MICA CAPACITOR FXO 750PF 1 300VDC CAPACITOR FXD 91PF 1 300VDC MICA 0 70 CAPACITOR FXD 250PF 1 100VDC MICA CAPACITOR FXD 750PF 1 300VDC MICA CAPACITOR FXD 1UF 5 100VDC MET POLYC CAPACITOR FXD 6 8PF 5 100VDC CER CAPACITOR FXD 1UF 5 100VDC MET POLYC CAPACITOR FXD 2 2PF 25PF 100VDC CER CAPACITOR FXD 60UF 10 6VDC CAFACITOR FXD 33UF 10 10VDC TA CAPACITOR FXD 1UF 5 100VDC MET POLYC CAPACITOR FXD 47PF 5 100VDC CER 04 30 CAPACITOR FXD A7PF 5 100VDC CER 0
165. 15 0160 2307 4 A13C16 0160 2307 4 A13C17 0160 4805 1 21504 TO 2032 1 413018 0160 4535 4 3 A13C19 0166 4535 4 ALIC20 0160 4535 4 TO 20224 0160 5459 5 3 A13C19 0160 5459 5 8 0160 5469 5 13 1 1901 0200 5 4 A13CR2 1901 0200 5 A13CR3 1901 0200 5 A13CR4 1901 0200 5 A13CR5 1905 0231 2 1 1200 0043 8 4 1205 0021 2 1 2190 0006 1 4 2360 0224 1 2 2420 0002 6 4 3050 0227 3 4 Refer te Section 7 fer update tnfaranation rev 16FEBIO Table 6 3 Replaceable Parts Description POWER SUPPLY MOTHERBOARD POWER SUPPLY MOTHERDOARD POWER SUPPLY MOTHERBOARD CAPACITOR FXD 3600UF 75 10 40VDC AL SCREW MACH 10 32 312 IN LG PAN HD POZI CAPACITOR FXD 3600UF 75 10 40VDC AL SCREW MACH 10 32 312 1 6 21 CAPACITOR FXD 013F 75 10 25VDC AL SCREW MACH 10 32 312 IN LG 2 CAPACITOR FXD 3600LIF 75 10 30VDC AL SCREW MACH 10 32 375 IN LG PAN HD POZI WASHER LK EXT T NO 10 195 IN 1ID CAPACITOR FXD 3600UF 75 10 40VDC AL SCREW MACH 10 32 375 IN LG PAN HD FOZI WASHER LK EXT T NO 10 195 IN ID CAPACITOR F XD 013F 75 10 25VDC AL SCREW MACH 10 32 375 IN LG PAN HD POZI WASHER LK EXT T NO 10 195 IN ID CAFACITOR FXD 1UF 10 35VDC TA CAPACITOR FXD 6 BUF 10 35VDC TA CAPACITOR FXD 1UF 10 35VDC CAFACITOR FXD 270PF 5 300VDOC MICA CAPACITOR FXD 2 2UF 10 20VDC TA CAPACITOR FXD 2 2UF 10 20VDC TA CAPACITOR FXD 6 8LIF 10 35VDC CAPACIT
166. 160 4793 0150 3324 0160 1700 150D606 9006B 2 1500336X90 10B2 0150 3324 0160 4805 0160 4805 0160 4835 0160 4835 0169 479 1500605X900SB2 0160 10370 0160 4635 0160 2236 150D 197X290 10R2 0160 4805 0160 4793 0160 4814 0160 4810 0160 4835 0160 4835 1500105 9035 2 A Errata part change 6 35 Replaceable Parts Reference Designation A4 4 46 4 47 4 48 4 49 4 50 4 51 4 52 4 53 4 54 AACSS A4CS6 4 57 4 58 4 59 4 60 4 61 4 62 4 63 4 64 4 65 4 66 4 67 A4C68 4 69 4 70 4 71 4 72 4 73 4 74 A4C75 4 76 A4C77 2450A T O 2520A A4CR2 260 AND ADOVE AICI A4CR3 2150A 2520A AICR A4CR5 ACRE AICR 20014 AND ADOVE A4CR4 A4CR5 AICRE AACR 4 8 A4CRS Refer ta Section 7 for update information 6 36 HP Part Number 0160 4835 0160 4805 0160 4835 0160 4835 0160 4799 0180 1746 0160 4814 0160 3324 0160 4835 0160 4835 0160 4653 0160 4835 0160 4814 0160 4653 0160 4653 0160 4653 0160 4653 0160 4653 0160 4843 0180 0228 0180 0228 0180 0228 0180 2206 0160 4807 0160 439 0180 0291 0160 5254 0160 4832 0160 4832 0160 4797 0160 4835 0160 4790 1901 0376 1901 0376 1901 0050 1901 0050 1901 0040 1901 0376 1901 0376 1901 0376 1901 0376 1901 0050 1901 0050 1901 0880 1901 0050 1901 0050 1901 0050 C D
167. 1902 0966 1902 0962 8159 0005 8159 0005 Errata part change 6 63 Model 8903B Reference Designation A7 A7 A7C1 A7C2 A7C3 A7C4 A7C5 A7C6 A7C7 7 8 A7C9 A7C10 A7C11 A7C12 A7C13 A7C14 A7C15 A7C16 A7C17 A7C18 A7C19 A7C20 7 21 A7C22 A7C23 A7C24 A7C25 A7C25 A7C27 A7C28 A7C29 A7C30 A7C31 A7C32 A7CH1 A7CR2 7 7 A7CR5 A7CR6 A7CR7 A7CR82 A7CR9 A7CR10 A7CR11 A7CR12 HP Part Number 08903 60130 0180 0116 0180 0229 0160 4832 0160 4832 0180 0116 0160 4832 0160 4832 0160 4832 0160 4832 0160 4832 0160 4832 0160 4832 0160 4832 0160 4832 0160 4832 0160 4832 0160 4832 0160 4832 0180 0376 0180 0376 0160 4822 0160 4822 0180 2249 0180 2249 0180 0376 0180 0376 0180 0376 0180 0116 0180 0116 0160 4789 0180 0376 0180 0376 1901 0040 1901 0040 1901 0050 1901 0050 1901 0050 1901 0050 1906 0042 1906 0388 1901 0050 1901 0050 1901 0050 1901 0050 AOAaANnND RHARKR bb bo p h Qty tRefer to Section 7 for update information rev 20JUN91 Table 6 3 Replaceable Parts Description LATCH ASSEMBLY CAPACITOR FXD CAPACITOR FXD CAPACITOR FXD CAPACITOR FXD CAPACITOR FXD CAPACITOR FXD CAPACITOR FXD CAPACITOF FXD CAPACITOR FXD CAPACITOR FXD CAPACITOR FXD CAPACITOR FXD CAPACITOR FXD CAPACITOR FXD CAPACITOR
168. 2 87K 1 125W F TCz0 4 100 24546 RESISTOR 16 2K 1 125W F 0 100 24546 RESISTOR 2 87K 1 125W 0 100 24546 RESISTOR 9K 1 125W TC 20 25 28480 RESISTOR 1K 1 125W F TCz0 4 25 28480 RESISTOR 909 1 125W F TC 20 100 24546 RESISTOR 9K 1 125W F 0 25 28480 RESISTOR 9K 1 125W 0 25 28480 RESISTOR 1K 1 125W 0 25 28480 RESISTOR 1K 1 125W 0 25 28480 RESISTOR 1K 1 125W F 0 100 24546 RESISTOR 620 5 25W CC 0 800 28480 RESISTOR 2 61K 1 125W F TC 0 100 24546 RESISTOR 10K 1 125W 0 25 28480 RESISTOR 31 6K 1 125W 0 100 24546 RESISTOR 31 6K 1 125W F 0 100 24546 RESISTOR 1K 1 195W F 0 100 24546 RESISTOR 5 11K 1 125W F 0 100 24546 RESISTOR 10K 1 125W TC 0 100 24546 RESISTOR 3 48 1 125W 0 1009 24546 RESISTOR 10K 1 125W 0 25 28480 RESISTOR 6 81 1 125W TC 0 100 28480 RESISTOR 100K 1 125W TC z0 100 24546 RESISTOR 5 11K 1 125W TC 0 100 24546 RESISTOR 2 37K 1 125W 0 100 24546 RESISTOR 3 83K 1 125W TC 0 100 24546 RESISTOR 300 1 125W 0 100 24546 RESISTOR 3 16K 1 125W 0 100 24546 RESISTOR 20K 1 125W 0 25 28480 RESISTOR 10K 1 125W TC 0 25 28480 RESISTOR 1 47 1 125W TC 0 100 24546 RESISTOR 17 8 1 125 0 100 24546 RESISTOR 1 47 1 125W 0 100 24546 RESISTOR 100 1 125W F 0 100 24546 RESISTOR 6 81
169. 2110 0269 11 2 2110 0269 0 FUSEHOLDER CLIP TYPE 250 FUSE 28480 2110 0269 11 2110 0269 0 FUSEHOLDER CLIP TYPE 25D FUSE 28480 2110 0269 11 4 2110 0269 0 FUSEHOLDER CLIP TYPE 250 FUSE 28480 2110 0269 11 2110 0269 0 FUSEHOLDER CLIP TYPE 25D FUSE 28480 2110 0269 A11MP6 2110 0269 0 FUSEHOLDER CLIP TYPE 25D FUSE 284B0 2110 0269 A11XQ1 1200 0041 6 3 SOCKET XSTR 2 CONT TO 3 SLDR EYE 28480 1200 0041 A11XU1 1200 0041 6 SOCKET XSTR 2 CONT TO 3 SLDR EYE 28480 1200 0041 A11XU2 1200 0041 6 SOCKET XSTR 2 CONT TO 3 SLDR EYE 28480 1200 0041 tRefer to Section 7 for update information Factory Selected Component Refer to Section 5 Errata part change rev 18FEB10 6 85 Model 8908 Reference Designation A12 A12 A12C1 A12C2 A12C3 12 4 A12J1 A12J2 A1233 1234 1215 1213 1212 1213 1214 HP Part Number 08903 60016 0160 2307 0160 2055 0160 2055 0160 2055 1250 1096 2190 0347 1250 1096 1250 1096 1250 1096 9140 0210 9140 0210 9140 0210 9140 0210 h gt o a o e lt Qty Refer to Section 7 for update information rev 20JUN9I Table 6 3 Replaceable Parts Description CONNECTOR FILTER ASSEMBLY CAPACITOR FXD 47PF 5 300VDC MICA CAPACITOR FXD 01UF 80 20 100VDC CER CAPACITOR FXD 01UF 480 2096 100VDC CER CAPACITOR FXD 01UF 80 2096 100VDC CER CONNECTOR RF BNC FEM SGL HOLE RR 50 OHM WASHER FL MTLC 7 16 IN 467 IN ID N
170. 25W F TC 0 25 19701 MF amp C 1 6 T9 2563 B A3R17 0598 8958 2 2 RESISTOR 511K 1 125W 0 100 28480 0698 8258 A3R18 0698 8827 4 5 RESISTOR 1M 1 125W F 1 0 100 28480 0698 8827 A3R19 0757 0280 3 RESISTOR 1K 1 125W TC 0 100 24546 Ca 1 B TO 100 1 F A3R20 0698 6360 6 RESISTOR 10K 1 125W TC 0 25 28480 0698 6360 21 0698 5360 6 RESISTOR 10K 1 125W 0 25 28480 0598 6350 A3R22 0698 6360 6 RESISTOR 10K 1 125W F TC 0 25 28480 0698 5360 A3Re3 0698 5360 6 RESISTOR 10K 1 125W F TC 204 25 28480 0698 6350 24 0598 6360 6 RESISTOR 10K 1 125W F 0 25 28480 0698 6360 A3R25 0698 8204 1 RESISTOR 7 98K 1 125W F 0 25 19701 MF4C1 8 T9 7981 R Refer to Section 7 for update information Factory Selected Component Refer to Section 5 A Errata part change rev 16FEB90 6 31 Replaceable Parts Reference Designation 26 A3R27 A3R28 29 A3R30 1 A3R32 A3R33 A3R34 A3R35 A3R36 A3R37 8 A3R39 A3R4O A3R41 A3R42 A3R43 4 A3R45 A3R46 A3R47 A3F48 A3R49 A3R50 51 A3R52 A3RS3 54 A3R55 A3F56 A3RS7 A3R58 59 A3R60 A3R61 A3R62 A3R63 A3F64 A3F65 A3F66 A3R67 68 A3R69 7 A3F7 1 A3R72 A3R73 A3R74 5 Number 0698 8205 0698 8047 0698 8049 0698 8053 0698 8050 0698 8958 0698 8827 0757 0280 0757 0280 0757 0442 0757 0280 0698 3157 0698 3157 0698 3157 0698 3157 0757
171. 28 NOT ASSIGNED 413829 NOT ASSIGNED 2717A TO 29224 AI3R28 0757 0280 3 RESISTOR 1K 1 6 125W TC 0 100 25456 C4 1 8 TO 1001 F AISR29 0698 3132 4 RESISTOR 261 t 125W F 0 100 25456 4 1 8 2610 Refer te Section 7 for update information Pactory Selected Component Refer to Section 5 Errata part change rev 16F EB9O 6 91 Replaceable Parts Reference HP Part Designation Number A13 C D Qty A13TP1 1251 0600 0 A13TP2 1251 0600 0 A13TP3 1251 0600 0 2450A TO 2922A AISTPI 1251 0600 0 1 5 1251 0600 0 A13TP6 1251 0600 0 2450 TO 26524 13 1 1826 0785 1 2717 TO 2922A A13UJ 5180 1817 1 2450A TO 20224 41802 1626 0117 3 2190 0006 1 2360 0229 1 A13VR1 1902 3381 1 13 2 1902 3381 1 A13VR3 1902 0950 6 24504 TO 2922 1902 0957 1 A13VRS 1902 0943 5 A13VR6 1902 0960 6 A13VR7 1902 3214 9 2450A TO 20224 AISVRS 1902 3194 4 A1T3VRS 1902 3107 9 A13VR10 1902 3214 9 A13VR11 1902 3094 3 A13XA2A 1251 2035 9 A13XA2B 1251 1365 6 A13XA3A 1251 2035 9 A13XA3B 1251 2035 9 A13XAA4A 1251 2035 9 A13XAA4B 1251 2025 9 A13XASA 1251 2035 9 A13XASB 1251 1365 6 1 1251 2035 9 13 6 1251 1355 6 AT3XATA 1251 1365 6 A13XA7B 1251 1365 6 1 1251 1365 6 Refer te Section 7 for npdate information 6 92 Table 6 3 Replaceable Parts Description CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SO
172. 285 QN2222A 1205 0012 MCR549P 2 2190 0006 ORDER BY DESCRIPTION 2420 0002 3050 0227 1884 0276 2190 0006 ORDER DESCRIPTION 2420 0002 3050 0227 526000 526000 2 2222 A Briata part change rev IEEE Model 8903 Reference HP Part D Mfr escription Designation Number D ty P Code A13R1 0757 0401 RESISTOR 100 1 125W 0 100 24546 A13R2 0698 3429 2 1 RESISTOR 19 6 1 125W TC 0 4 100 03888 A13R3 0757 0401 0 RESISTOR 100 1 125W 0 100 24546 A13R4 0757 0440 7 RESISTOR 7 5K 1 125W TC 0 100 24546 A13R5 8110 0180 0 1 RIBBON RES 157 OHM FT 0253X 0625 28480 A13R6 0757 0460 1 1 RESISTOR 61 9K 1 125W TC 0 100 24546 A13R7 0757 0280 3 RESISTOR 1K 1 125W 0 100 24546 A13R8 0698 0083 8 RESISTOR 1 96K 1 125W F 0 100 24546 A13R9 0757 0394 0 RESISTOR 51 1 1 125W F TC 04 100 24546 A13R10 0757 0394 0 RESISTOR 51 1 1 125W F TC 0 100 24546 A13R11 0757 0290 5 RESISTOR 6 19K 1 125W F TC 0 100 19701 A13R12 0698 4020 1 RESISTOR 9 53K 1 125W F TC 0 100 24546 A13R13 0757 0274 5 RESISTOR 1 21K 1 125W TC 0 100 24546 A13R14 0757 0401 0 RESISTOR 100 1 125W 0 100 24546 A13R15 NOT ASSIGNED A13R16 0757 0401 0 RESISTOR 100 1 125 TC 0 100 24546 A13817 0757 0401 0 RESISTOR 100 1 125 0 100 24546 A13R16 0757 0280 3 RESISTOR 1K 1 125W F 0 100 24546 13 19 0757 0401 RESISTOR 100 1 125W 0 100 2454
173. 3 is a resistive match for the resistance of Q11 or QI2 Sum Amplifier 2 injects the error signal from the notch Balance and Tune Multipliers to automatically fine balance and tune the Notch Filter see Service Sheet 4 The FETs are driven by the Notch Control Drivers Pre Notch RMS and Average Detectors The Pre Notch RMS and Average Detectors convert the ac signal at the input to the Notch Filter but following the Weighting Bandpass and High Pass Filters see Service Sheet 2 to an equivalent dc voltage measured by the Voltmeter The conversion can be either rms responding or average responding as selected by 1 19 U17 is the true rms converter The Pre Notch Average Detector is calibrated to output a dc voltage corresponding to the rms value of a sine wave input The average responding converter consists of U18A and associated components which function as a full wave rectifier and U18B and associated components which function as a low pass filter Full wave rectification is produced by summing the half wave rectified current flowing through R100 with the un rectified current flowing through R98 The rectified current is weighted twice as heavily as the un rectified current since R100 is half the value of R98 Since U184A inverts as well as rectifies the summing of currents is equivalent to a subtraction 8B 31 Service Model TROUBLESHOOTING SERVICE SHEET 3 TROUBLESHOOTING General Procedures for checking the Notch Filter Assemb
174. 300VDC 28480 CAPACITOR FXD 750PF 1 300VDC MICA 28480 CAPACITOF FXD 100PF 1 300VDC MICA 28480 CAPACITOR FXD 250PF 1 100VDC MICA 28480 CAPACITOR FXD 750PF 1 300VOC MICA 28480 CAPACITOR FXD 1UF 5 100VDC MET POLYC 28480 CAPACITOR FXD 6 8PF 5 100VDC CER 28480 CAPACITOR FXD 1UF 5 100VDC MET POLYC 28480 CAPACITOR FXD 2 2PF 25PF 100VDC CER 28480 CAPACITOR FXD 60UF 10 6VDC 56289 CAPACITOR FXD 33UF 10 10VDC TA 56289 CAPACITOR FXD 1UF 5 100VDC MET POLYC 28480 CAPACITOR FXD 47PF 5 100VDC CER 0 30 28480 CAPACITOR FXD 47PF 5 100VDC CER 0 30 28480 CAPACITOR FXD 1UF 10 5OVDC CER 28480 CAPACITOR FXD 1UF 10 50VDC CER 28480 CAPACITOR FXD 3 3PF 25 200VDC CER 28480 CAPACITOR FXD 2 2PF 25 100VDC CER 28480 CAPACITOR FXD GOUF 10 GVDC 56289 CAPACITOR FXD 1UF 10 SOVDC CER 28480 CAPACITOR FXD 1UF 10 50 0 CER 28480 CAPACITOR FXD 1PF 25PF SOOVDC CER 28480 CAPACITOR FXD 100UF 10 10VDC TA 56289 CAPACITOR FXD 47PF 5 100VDC CER 0 4 30 28480 CAPACITOR FXD 6 8PF 5 100VDC CER 28480 Selected C ompenent Refer te Sectioun 5 08903 60283 08903 60282 150D107X9010R2 1500475 9035 2 1500106 9020 2 1500475 9035 2 1500 105X9035A2 1500105 9035 2 1500105 9035 2 1500105 9035 2 0160 4805 0160 2236 1500 106X9020B2 0160 4843 0160 5876 0160 5409 0160 0336 0160 4679 0160 4456 0160 0335 0160 3046 0160 4456 0160 3324
175. 3107 1902 3214 1902 3094 1251 2035 1252 4187 1251 2035 1251 2035 1251 2035 1251 2035 1251 2035 1252 4187 1251 2035 1252 4187 1252 4187 1252 4187 1252 4187 1252 4187 1252 4187 1252 4187 1252 4187 1251 1626 1251 0472 1251 0472 1251 0472 Errata part change rev 20JUN91 Model 8903B Reference Designation A14 A14 14 1 Refer tu Section 7 for update information 16 90 Number 0960 0443 0969 0736 C p Y 1 1 5 1 Table 6 3 Replaceable Parts Description Mfr P Code LINE POWER MODULE 28480 LINE VOLTAGE SELECTION CARD 28480 rTactory Selectesl Choan ponent Refer te Sectjen 5 Replaceable Parts Mfr Part Number 0960 0443 0960 0736 A Errata par change 6 99 Model 8903 Qty oh gt ae my 16 Reference HP Patt C Designation Number D 21504 TO 26014 F1 2110 0059 Fi 2110 0360 2 261 1A AND ABOVE Fl 2110 0043 8 2110 0001 8 J1 J2 J3 1510 0038 e 2190 0027 6 2950 0C06 3 J4 J5 J6 1510 0038 8 2190 0027 6 2950 0006 3 J7 J8 J9 J10 1 1120 0694 5 1155 3 2260 0009 3 3350 953 7 2820 0002 4 0590 1580 4 2450A TO 20084 1 2910 AND ABOVE 1 08903 20298 4 2450A ONLY 5020 8835 5 2510 0192 6 MP3 08903 60168 1 2360 0115 4 2520 AND ABOVE MP2 5021 5836 1 0515 1331 5 MP3 08903 60169 2 0515 4950 4 tRefer t Section 7 for npilate
176. 3E 7 8 118 2 14 89 Service Model 8903B E 557 8 118 3 ava ouas RHS ZERO RMS ZERO METER DC SCALE PEAK SCALE TP2 AOJUST ADJUST 4 TPS TPB TP6 CAL LBRAT ON te 1 7 CALIBRATION e 0 P MP2 eS T NIME nig git ga 21 2 B ale dia Oe T Al r i i 89983 59202 99903 60293 POSITION POSITION CRIS CR17 ED ED Uu u28 C65 c7e G 104 qii TERI RIS 017 Figure 8B 118 Component Locator 8903B 2816 and above Figure 8B 118 Component Locator 8903E 2818 and above rev 14FEB89 P O A13 POWER SUPPLY 0 A4 OU AND MOTHERBOARD 7 ASSEMBLY 08903 60129 4 OUTPUT AMPLIFIER VOLTMETER ASSEMBLY 08903 60128 e um 1 P O 1 VO SEL FROM LATCH VO SEL 4 12 13 SEL 2 2B VDO SEL 3 DETECTOR lt 1 gt SWITCHES PRE 15V FROM NOTCH NOTCH 10 1 n 17Bk 3 4 098 13 3 3 26 2 24 7 FROM l INPUT INPUT R110 R111 AMPLIFIER RN NOTE S T eae 2 19 C63 TET 3 1 R200 A204 2500 2500 v i RIPPLE FILTER t7 5V i R104 SINAD FILTER 162k 61 C64 0 47
177. 4 Connect the oscilloscope or a logic probe to A7TP6 RSI The signal should be a TTL high Hint All outputs of U4 and U18 should be in the high open state 5 Perform the following procedure Each procedure should generate a TTL low at A7TP6 Remove the shorts after each step is completed a Short out R81 This will also generate Error 30 b Short pin 4 of U4A to 5 c Short pin 4 of U4A to 15V d Short 6 of U18B to 15V e Short pin 6 of U18B to 15V f Short pin 9 of U18C to 15V g Short pin 9 of U18C to 15V 8B 23 Service Model 8903B PRINCIPLES OF OPERATION SERVICE SHEETS 2A AND 2B SERVICE SHEETS 2A AND 2B A2A1 and A2A2 Weighting Bandpass and High Pass Filter Assemblies PRINCIPLES OF OPERATION The Weighting Bandpass and High Pass Filter Assemblies A2A1 or A2A2 are optional audio filters which plug onto the A2 Input Amplifier Assembly to filter the signal before being measured by the Pre Notch RMS Average or Output RMS Average Detector In general the filters are quite similar The filters are active types composed of multiple high pass low pass and bandpass sections The CCITT Weighting Filter will serve as an example The CCITT Weighting Filter sometimes referred to as a psophometric filter is a complex collection of poles and zeros which produces a bandpass response UIA U1B UID and their associated resistors and capacitors low pass responses UIC and its associated re
178. 4 100 24546 4 1 8 0 1001 A2R39 0757 0280 3 RESISTOR 1K 1 125W 0 100 24546 4 1 8 0 1001 A2R40 0696 8835 4 3 RESISTOR 5K 1 125W TC 204 10 28480 0698 8835 A2R41 0698 8835 4 RESISTOR 5K 1 125W TC 0 4 10 28480 0698 8835 A2R42 0699 0513 1 1 RESISTOR 4 98K 1 1W F 0 10 28480 0699 0513 A2R43 2100 0552 3 1 RESISTOR TRMR 50 10 C SIDE ADJ 1 TRN 28480 2100 0552 2 4 2100 3355 0 3 RESISTOR TRMR 100K 10 C SIDE ADJ 1 TRN 28480 2100 3355 A2RA45 0698 7196 8 RESISTOR 21 5 1 05W 0 100 24546 C3 1 8 TO 21R5 F A2F46 0698 8835 4 RESISTOR 5K 1 125W 0 10 28480 0698 8835 2 47 0698 7265 2 1 RESISTOR 16 2 1 05W TC 0 100 24546 3 1 8 0 1622 2948 0698 7196 8 RESISTOR 21 5 1 05W 0 100 24546 C3 1 8 TO 21R5 F A2R49 0757 0280 3 RESISTOR 1K 1 125W TC 0 100 24546 4 1 8 0 1001 2950 1810 0207 9 1 NETWORK RES 8 SIP22 0K OHM X 7 01121 208A223 2 51 0698 7256 1 3 RESISTOR 6 81K 1 05W 0 100 24546 1 8 0 681 1 2 52 NOT ASSIGNED 2 5 ASSIGNED 2954 0698 7253 8 8 RESISTOR 5 11K 1 05W 0 100 24546 C3 1 8 TO 5 11 1 F 2 55 NOT ASSIGNED 2 58 0698 7404 1 1 RESISTOR 1 005 1 125W 0 50 19701 ME4C 1 8 T2 1005R B 2957 0699 0411 8 1 RESISTOR 634 1 25W 0 25 28480 0699 0411 2 58 0698 6355 9 1 RESISTOR 400 1 125W 0 25 28480 0698 6355 A2R59 0698 6447 0 RESISTOR 683 B 1 125W 0 25 28480 0698
179. 4 CONT DIP DIP SLDR 28480 1200 1027 A1U6 1990 0753 0 DISPLAY NUM SEG 10 CHAR 43 H RED 20480 1990 0753 1200 1027 0 SOCKET DSPL 14 CONT DIP DIP SLOR 28480 1200 1027 A1U7 1820 1729 IC LCH TTL LS COM CLEAR 8 01295 SN74LS259N A1U8 1990 0753 DISPLAY NUM SEG 10 CHAR 43 H RED 28480 1990 0753 Refer to Note 1 on page 8D 114 1 for the correct orientation of A1U8 1200 1027 0 SOCKET DSPL 14 CONT DIP DIP SLDR 28480 1200 1027 109 1990 0753 0 DISPLAY NUM SEG 10 CHAR 43 H RED 28480 1990 0753 1200 1027 0 SOCKET DSPL 14 CONT DIP DIP SLDR 28480 1200 1027 A1U10 1990 0753 0 DISPLAY NUM SEG 10 CHAR 43 H RED 28480 1990 0753 1200 1027 9 SOCKET DSPL 14 DIP SLDR 28480 1200 1027 1011 1920 0753 0 DISPLAY NUM SEG 10 43 H RED 28480 1990 0753 1200 1927 0 SOCKET DSPL 14 DIP DIP SLOR 28480 1200 1027 1012 1990 0753 0 DISPLAY NUM SEG 10 CHAR 43 H RED 28480 1990 0753 1200 1027 0 SOCKET DSPL 14 CONT DIP SLDR 28480 1200 1027 A1U13 1820 1729 3 IC LCH TTL LS COM CLEAR 8 BIT 01295 SN74LS259N 1014 1820 1729 3 IC LCH TTL LS COM CLEAR 8 BIT 01295 SN74LS259N A1U15 1820 1720 3 IC LOH TTL LS COM CLEAR 8 BIT 01295 SN74LS259N A1U16 1820 1729 3 IC LCH TTL LS COM CLEAR 8 BIT 01295 SN74LS259N 1017 1020 1729 3 IC LCH TTL LS COM CLEAR B BIT 01295 SN74LS259N 1018 1820 1729 3 IC TTL LS CLEAR 8 BIT 01295 5 7415259 1019 1820 1729 3 IC LCH TTL LS COM CLEAR 8 BIT 01295 SN74LS259N A1U20 1820 1729 3 iC LCH TTL LS COM CLEAR 8 BIT 0
180. 4 DIP P 01295 IC OP WB 8 DIP C PKG 06665 IC SWITCH ANLG QUAD 16 DIP C PKG 27014 WB 8 DIP C PKG 06665 IC SWITCH ANLG DUAL 16 DIP C PKG 32293 IC SWITCH ANLG DUAL 16 DIP C PKG 32293 DIODE ZNR 2 4V 5 DO 35 PD 4W 037 28480 DIODE ZNR 7 5V 5 DO 35 PD 4W 05 28480 DIODE ZNR 2 87V 5 DO 7 PD 4W TC 07 28480 DIODE ZNR 1N827 6 2V 5 00 7 PDz 4W 24046 DIODE ZNR 6 2V 5 DO 35 4W 053 28480 Factory Selected Component Refer te Section 5 Model 8903B Mfr Part Number 17 2 MC340048L MUXOSFO LM339N 17 2 LF13201D OP 17F2 IHSO43CDE IHSO43CDE 1902 0943 1902 0064 1902 3024 1N827 1902 0953 Errata part change rev 16FEB90 Model 8903B 08903 60183 SERIAL 2730A TO 2813A HP8903B Qty 1 Tuble 6 3 Replaceable Parts Description OUTPUT AMPLIFIER VOLTMETER ASSEMBLY Mfr Code 28480 Replaceable Parts Mfr Part Number 08903 60183 08903 60283 SERIAL PREFIX 2816 AND ABOVE HP8903B 1 N Reference HP Part C Designation Number D A4 08903 60183 0 A4 08903 60283 1 4 08903 60282 0 A4Ct 0180 2207 5 4 2 0180 0100 3 A4C3 0180 0374 3 4 0180 0100 3 AACS 0180 0291 3 A4C6 0180 0201 3 4 7 0180 0291 3 A4CB 0180 0291 3 A4C9 0160 4805 1 4 10 0160 2236 8 4 11 0180 0374 3 4 12 0160 4843 7 4 13 0160 5876 8 4 14 0160 5409 3 4 15 0160 0335 5 4 16 0160 4679
181. 4546 RESISTOR TRMR 10K 10 C SIDE ADJ 17 TRN 02111 RESISTOR 1K 1 125W F 0 100 24546 RESISTOR 5K 1 125W F 1 0 25 03888 RESISTOR SK 1 125W F 0 25 03888 RESISTOR 1 33K 1 125W F TC 0 100 24546 RESISTOR 21 5 1 125W 0 100 03888 RESISTOR 38 3K 1 125W F 0 100 24546 RESISTOR 1 62K 1 125W F 0 100 24546 RESISTOR 100 1 125W TC 04 100 24546 Faetory Selected Clompenent te Sertion Replaceable Parts Mfr Part Number PMESS 1 8 T0 21R5 F 55 1 8 0 21 5 4 1 8 10 1002 4 1 8 0 1001 4 1 8 0 1002 1 8 0 1002 4 1 8 0 1001 4 1 8 0 1002 C4 1 8 TO 1003 F C4 1 8 TO 38R3 F C4 1 8 T0 38R3 F 4 1 8 0 1001 4 1 8 0 101 4 1 8 0 1001 4 1 8 0 1001 C4 1 8 TO 5G2R F C4 1 8 TO 4222 F 4 1 8 0 1623 MF4C1 8 10 9081 F C4 1 8 TO 1001 F 4 1 8 0 1002 4 8 10 6191 4 1 8 0 3832 55 1 8 0 21 5 4 1 8 0 1331 Ca 1 8 TO 38R3 F C4 1 8 TO 38R3 F 4 1 8 10 1002 4 1 8 0 1001 C4 1 8 TO 5111 F C4 1 8 TO 38R3 F 1 8 0 1002 4 1 8 0 101 0699 0400 MF4C 1 8 T9 7981 8 4 1 8 1961 C4 1 8 T0 348R F 4 1 8 10 101 43 103 4 1 8 10 1001 55 1 8 9 5001 55 1 8 9 5001 4 1 8 0 1331 PMESS 1 8 TO 21R5 F C4 1 8 TO 3832 F 4 1 8 0 1621 4 1 8 70 101 A Errata part change 6 55
182. 456 5 1 RESISTOR 287K 1 125W 0 100 24546 C4 1 8 T0 2873 F A4R109 0698 3453 2 RESISTOR 196K 1 125W F 0 100 24546 4 1 8 0 1963 F A4R110 0698 6631 4 RESISTOR 2 5K 1 125W TC 0 25 28480 0698 6631 4 111 0698 6631 4 RESISTOR 2 5K 1 125W F TC 0 25 28480 0698 6631 A4R112 0757 0279 0 RESISTOR 3 16K 1 125W 0 100 24546 C4 1 8 T0 3161 F A4R113 0757 0470 3 RESISTOR 162K 1 125W TC 0 100 24546 C4 1 B TO 1623 F A4R114 0757 0279 0 RESISTOR 3 16 1 125W 0 100 24546 4 1 8 0 3161 4 115 0757 0279 0 RESISTOR 3 16K 1 125W 0 100 24546 4 1 8 0 3161 A4R116 0757 0442 9 RESISTOR 10K 1 125W 0 100 24546 1 8 0 1002 A4R117 0757 0279 0 RESISTOR 3 16 1 125W 0 100 24546 4 1 8 0 3161 A4R118 0757 0290 5 RESISTOR 6 19K 1 125W F TC 0 100 19701 MF4C1 8 T0 6191 F 4 119 0757 0421 4 1 RESISTOR 825 1 125W 0 100 24546 C4 1 8 TO 825R F A4R120 0698 3443 0 1 RESISTOR 287 1 125W 0 100 24546 C4 1 8 T0 287R F 4 121 0757 0290 5 RESISTOR 6 19 1 125W 0 100 19701 4 1 8 0 6191 4 122 0757 0422 5 RESISTOR 909 1 125W F TC 0 100 24546 C4 1 8 T0 909R F A4R123 0698 3441 8 1 RESISTOR 215 1 125W 0 100 24546 C4 1 8 T0 215R F A4R124 0698 0082 7 1 RESISTOR 464 1 125W TC 0 100 24546 4 1 8 0 4640 A4H125 2100 3103 6 2 RESISTOR TRMR 10K 10 C SIDE ADJ 17 TRN 02111 43P103 A4R126 0757 0442 9 RESISTOR 10K 1 125W
183. 5 Vdc Hint Pin 1 of U8A should be a 0 to 15V square wave with a period of 2 ms The source of Q5 should be negative half wave rectified sine wave Q1 should be off 7 On the Audio Analyzer key in FREQ 2 kHz The dc level should be between 5 and 4 Vdc Hint Pin 1 of U8A should be a 0 to 15V square wave with a period of 0 5 ms The source of QS should be a positive half wave rectified sine wave 8 On the Audio Analyzer key in 0 56 S Shift 3 SPCL to discharge the Tune and Balance Integrators The dc level should be between 50 and 50 mVdc Hint Pin 14 of U16D should be 0 Vdc Q1 should be on 9 Connect the oscilloscope to A3TP4 The dc level should be between 50 and 50 mVdc 8 36 Model 8903 Service TROUBLESHOOTING SERVICE SHEET 4 Hint Q8 should be on 10 On the Audio Analyzer key in 0 565 SPCL to disable the discharge of the Tune and Balance Integrators Connect one channel of the oscilloscope ac coupled to A3TP5 and the other channel to pin 2 of U9 Trigger the oscilloscope from the signal on 5 BP OUT The two signals should be in phase The signal to pin 2 of U9 should have an amplitude of approximately 100 mV pp ll On the Audio Analyzer key in FREQ 500 Hz The two signals should be approximately 180 out of phase 12 On the Audio Analyzer key in FREQ 1 kHz Move the oscilloscope from 5 to A3TP6 HP OUT and from pin 2 of U9 to pin 2 of U4 The two signals
184. 539 7445 0 ORDER BY DESCRIPTION ORDER BY DESCRIPTION 539 7445 02 ORDER BY DESCRIPTION ORDER BY DESCRIPTION 0189 0452 ORDER BY DESCRIPTION ORDER DESCRIPTION 150D105X9035A7 150D5683X9035B7 1500105 9035 2 19 271 0300 1 1500225 9020 2 1500225 9020 2 1500685 903552 1500225 9020 2 0160 0276 0160 2307 0160 2307 0160 2207 0160 2307 0160 1805 0160 4535 0150 4535 0160 4535 0160 5469 0160 5450 0160 5459 1901 0200 1901 0200 1901 0200 1901 0200 1906 0231 1200 0043 1205 0021 2190 0005 ORDER DESCRIPTION 2420 0002 3050 0227 A Errat part change 6 89 21504 2922 Replaceable Parts Reference HP Part Designation Number A13 D Qty ALIICRE 1901 0159 3 7 A13CR7 1901 0033 2 A13CR8 1901 0033 2 A13CR9 1901 0033 2 A19CR10 1901 0033 2 13 11 1901 0159 3 2450A TO 2922A AJ3CP 12 1901 0159 3 13 13 1901 0159 3 A13CR14 1901 0159 3 1 15 1901 0159 3 A13CR16 1901 0159 3 A13DS1 1990 0485 5 4 21504 TO 29224 ALSDSZ 1990 0485 5 A13DS3 1990 0485 5 A13DS4 1990 0485 5 A13J1 1251 4736 1 1 A13J2 1251 3412 8 1 A13J3 1251 5169 6 2 A13JP1 B 8159 0005 A13JP1 E 8159 0005 0 A13J4 1251 5169 6 2450 TO 2922A 131 1 9140 0137 1 1 131 2 9100 3922 4 5 A13L3 9100 3922 4 A13L4 9100 3922 4 A13L5 9100 3922 4 A13L6 9100 3922 4 A13L7 9140 0210 1 A13MP1 0403 0285 9 8 1301 1854 0477 7 1205 0012 1 1 A13Q2 1864 0005 0 1 2190
185. 555200 0960 0443 8120 1378 08903 50176 A Errota part change 6 105 Model 8903 Replaceable Parts Table 6 4 Code List of Manufacturers ANY SATISFACTORY SUPPLIER SANGAMO ELEC CO S CAROLINA DIV ALLEN BRADLEY CO TEXAS INSTR INC SEMICOND CMPNT DIV SPECTROL ELECTRONICS CORP ILLINOIS TOOL WORKS INC FASTEX DIV K D I PYROFILM CORP MOTOROLA SEMICONDUCTOR PRODUCTS PANDUIT CORP PRECISION MONOLITHICS INC RICHCO PLASTIC CO FAIRCHILD SEMICONDUCTOR DIV SILICONIX INC VOLTRONICS CORP MEPCO ELECTRA CORP TRANSITRON ELECTRONIC CORP ANALOG DEVICES INC CORNING GLASS WORKS BRADFORD SIEMENS CORP NATIONAL SEMICONDUCTOR CORP HEWLETT PACKARD CO CORPORATE HQ RCA CORP SOLID STATE DIV AAVID ENGINEERING INC INTERSIL INC ADVANCED MICRO DEVICES INC HARRIS SEMICON DIV HARRIS INTERTYPE EXAR INTEGRATED SYSTEMS INC SPRAGUE ELECTRIC CO BUSSMAN MFG DIV OF MCGRAW EDISON CO ELECTRO MOTIVE CORP JOHNSON E F CO LITTELFUSE INC CAPACITOR DIV rev 22MAY90 PICKENS SC MILWAUKEE DALLAS TX CITY OF IND CA DES PLAINES IL WHIPPANY NJ PHOENIX 2 TINLEY PARK IL SANTA CLARA CA CHICAGO IL MOUNTAIN VIEW CA SANTA CLARA CA HANOVER NJ MINERAL WELLS TX WAKEFIELD MA NORWOOD BRADFORD PA ISELIN NJ SANTA CLARA CA PALO ALTO SOMERVILLE NJ LACONIA NH CUPERTINO CA SUNNYVALE CA MELBOURNE FL SUNNYVALE CA NORTH ADAMS MA ST LOUIS MO FLORENCE SC WASECA MN DES PLAINES IL OGALLALA NE 6 107 Replaceab
186. 6 A13R20 0698 3437 2 RESISTOR 133 1 125W TC x 0 100 24546 A13R21 NOT ASSIGNED 1 22 ASSIGNED A13R23 0757 0401 0 RESISTOR 100 1 125W 0 100 24546 A13H24 0757 0442 9 RESISTOR 10K 1 125W 0 100 24546 A13R25 0757 0401 0 RESISTOR 100 1 125W TC 0 100 24545 A13R26 0698 3437 2 RESISTOR 133 1 125W TC 0 100 24546 A13R27 0698 8827 4 RESISTOR 1M 1 125W TCz 04 100 28480 A13R2B 0757 0280 3 RESISTOR 1K 1 125W 0 100 25456 A13R29 0698 3132 4 RESISTOR 261 1 125W TC 0 100 25456 tRefer to Section 7 for upilate information T actoyy Selected Component Refer ta Section 5 reu 16FEB90 Table 6 3 Replaceable Parts Replaceable Parts Mfr Part Number 4 1 8 0 101 PMESS 1 8 TO 19R6 F 4 1 8 0 101 C4 1 8 TO 7501 F 8110 0180 C4 1 8 TO 6192 F 4 1 8 1001 4 1 8 1961 C4 1 8 T0 51R1 F 4 1 8 0 6 1 4 1 8 0 6191 4 1 8 0 9531 4 1 8 1211 4 1 8 70 101 C4 1 8 TO 101 F C4 1 8 T0 101 F 4 1 8 0 1001 4 1 8 0 101 C4 1 8 TO 133R F C4 1 8 TO 101 F 4 1 8 0 1002 C4 1 8 TO 101 F C4 1 8 TO 133R F 0698 8827 4 1 8 0 1001 4 1 8 2610 Errata part change 6 97 Replaceable Parts Reference HP Part Designation Number A13TP1 1251 0600 1 2 1251 0600 A13TP3 1251 0600 A13TP4 A13TP5 1251 0600 A19TP6 1251 0600 1301 5180 1817 1302 2190 0006 2360 0229 A
187. 6 3 Replaceable Parts Reference HP Part D Mfr escription 3 Designation Number D y p Code A13CR6 NOT ASSIGNED A13CR7 1901 0033 2 DIODE GEN PRP 180V 200MA 7 28480 A13CR8 1901 0033 2 DIODE GEN PRP 180V 200MA DO 7 28480 A13CR9 1901 0033 2 DIODE GEN PRP 180V 200MA DO 7 28480 A13CR10 1901 0033 2 DIODE GEN PRP 180V 200MA DO 7 28480 1 11 1901 0159 3 DIODE PWR 400V 750 DO 41 28480 13 12 NOT ASSIGNED A13CR13 1901 0159 3 DIODE PWR RECT 400V 750MA DO 41 28480 A13CR14 1901 0159 3 DIODE PWR RECT 400V 750MA 00 41 28480 A13CR15 1901 0159 3 DIODE PWR RECT 400V 750MA 00 41 28480 A13CR16 1901 0159 3 DIODE PWR 400V 750MA DO 41 28480 A13DS1 1990 0485 5 4 LED LAMP LUM INT 800UCD IF 28480 A130S2 NOT ASSIGNED A13DS3 1990 0485 5 LED LAMP LUM INT 2 800UCD IF 28480 13054 1990 0485 5 LED LAMP LUM INT 800UCO IF 30MA MAX 28480 1321 1251 4736 1 1 CONNECTOR 26 RECTANGULAR 28480 A13J2 1251 3412 8 1 CONNECTOR 6 PIN POST TYPE 28480 A13J3 1251 5169 6 2 CONNECTOR 6 POST 28480 A13JP1 B 8159 0005 0 RESISTOR ZERO OHMS 22 AWG LEAD DIA 28480 A13JP E 8159 0005 0 RESISTOR ZERO OHMS 22 AWG LEAD DIA 28480 13 4 1251 5169 6 CONNECTOR 6 M POST 28480 A13L 1 NOT ASSIGNED A13L2 9100 3952 4 5 INDUCTOR FIXED 120 1300 HZ 28480 1313 9100 3922 4 INDUCTOR FIXED 120 1300 HZ 28480 A13L4 9100 3922 4 INDUCTOR FIXED 120 1300 HZ 28480 A13L5 9100 3922 4 INDUCTOR FIXED 12
188. 60 2055 9 CAPACITOR FXD O1UF 80 20 100VDC CER 28480 0160 2055 8 8 0160 2055 9 CAPACITOR FXD O1UF 80 20 100VDC CER 28480 0160 2055 A8C9 0160 2055 9 CAPACITOR FXD 01UF 80 20 100VOC CER 28480 0160 2055 A8C10 0160 2055 9 CAPACITOR FXD 01UF 4 80 20 e 100VDC CER 28480 0160 2055 11 0160 2055 9 CAPACITOR FXD O1UF 80 20 100VDC CER 20480 0160 2055 8 12 0160 2055 9 CAPACITOR FXD O1UF 80 20 100VDC 20480 0160 2055 ABC13 0160 3456 6 CAPACITOR FXD 1000PF 10 1KVOC CER 28480 0160 3456 ABC14 0160 3456 6 CAPACITOR FXD 1000 10 1KVDC CER 28480 0160 3456 15 0180 0197 8 CAPACITOR FXD 2 2UF 10 20VDC 56289 150D225X9020A2 A8C16 0180 0229 7 CAPACITOR FXD 33 10 10VDC 56289 1500336X9010B2 17 0180 0197 8 CAPACITOR FXD 2 2UF 10 20VDC TA 56289 1500225 9020 2 ABC18 0180 0197 8 CAPACITOR FXD 2 2UF 10 20VDC 56289 150D225X9020A2 ABC19 0180 0197 8 CAPACITOR FXD 2 2UF 10 20VDC TA 55289 150D225X9020A2 20 0160 2055 9 CAPACITOR FXD 01UF 80 20 100VDC CER 28480 0160 2055 8 21 0160 2055 9 CAPACITOR FXD 01UF 80 20 100VDC CER 28480 0160 2055 ABC22 0160 2055 9 01UF 80 20 100VDC CER 28480 0160 2055 8 23 NOT ASSIGNED ABC24 0160 2055 9 CAPACITOR FXD 01UF 80 20 100VDC CER 28480 0160 2055 ABC25 0160 2264 2 CAPACITOR FXD 20 5 500VDC 0 30 28480 0160 2264 26 0160 4789 1 CAFACITOR FXD 15 5 100VDC CER 0 30 28480 0160 4789 A8C27 0121 0435 4 1
189. 60 4902 9 3 CAPACITOR 68PF 5 100VDC CER 0 30 28480 0160 4803 A2C27 0160 4803 9 CAPACITOR FXD 88PF 5 100VDC CER 04 30 28480 0160 4803 A2C28 0160 4835 7 CAPACITOR FXD 1UF 10 50VDC CER 28480 0160 4835 2 29 0160 4835 7 CAPACITOR FXD 1UF 10 SOVDC CER 28420 0160 4835 A2C30 0160 4835 7 CAPACITOR FXD 1UF 10 SOVDC CER 28480 0160 4835 A2C31 0160 4835 7 CAPACITOR FXD 1UF 10 5 CER 28480 0160 4835 2 32 0160 4803 9 CAPACITOR FXD 68PF 5 100VDC CER 0 30 28480 0160 4803 A2C33 NOT ASSIGNED A2C34 0160 4825 7 CAPACITOR 1UF 10 50VDC CER 28480 0160 4835 2 35 0160 4835 7 CAPACITOR FXD 1UF 4 10 5 28480 0160 4835 A2C36 0160 4835 7 CAPACITOR FXD 1UF 10 SOVDC CER 28400 0160 4835 A2C37 0180 2207 5 5 CAPACITOR FXD 100UF 10 10VDC 56289 1500107 X9010R2 2 38 0180 2207 5 CAPACITOR FXD 100UF 10 10VDC 56289 150D107X9010R2 2 39 0160 4835 7 CAPACITOR FXD 1UF 10 50 0 CER 28480 0160 4835 2 40 0160 4786 7 CAPACITOR FXD 27PF 5 100VDC CER 0 30 28480 0160 4786 A2CA1 0160 4835 7 CAPACITOR FXD 1UF 10 SOVDC CER 28480 0160 4835 A2C42 0160 4835 7 CAPACITOR FXD 1UF 10 50VDC CER 28480 0160 4835 Refer te Section 7 for update information Factory Selected Component Refer te Section 5 A Erat part change rev 16FEB90 6 9 Qty Replaceable Parts Reference HP Part C Designation Number D 2 43 52 A2C53 0180 0100 3 2 54 2 55 2 56 0160 4835 7 A2C5
190. 640 40052 2 LEVER SLIDE SWITCH 28480 08640 40052 0515 0365 3 6 SCREW MACH ASSY 2 0 4 4MM LG 00000 ORDER BY DESCRIPTION 0515 0374 4 6 SCREW MACH ASSY M3 X 0 5 10MM LG 00000 ORDER BY DESCRIPTION 2742A AND ABOVE S4 NOT ASSIGNED 2520A TO 2601A T1 9100 4118 2 1 TRANSFORMER POWER 100 120 220 240V 28480 9100 4118 0515 1408 7 4 SCREW MACH 4 0 60MM LG PAN HD 28480 0515 1408 2190 0586 2 4 WASHER LK HLCL 4 0 MM 4 1 MM ID 28480 2190 0586 0535 0006 1 4 NUT HEX DBL CHAM M4 X 0 7 3 2MM THK 00000 ORDER BY DESCRIPTION 3050 0893 9 WASHER FL MTLC 4 0 MM 4 4 MM ID 28480 9050 0893 3050 2007 1 WASHER SHLDR NO 6 169 IN ID 375 IN OD 28480 3050 2007 1400 0249 0 4 CABLE TIE 062 625 DIA 091 WD NYL 06383 PLT1M 8 2614A AND ABOVE 9100 4516 4 1 TRANSFORMER POWER 100 120 220 240V 28480 9100 4516 0515 1408 7 4 SCREW MACH 4 0 60MM LG PAN HD 28480 0515 1408 2190 0586 2 4 WASHER LK HLCL 4 0 4 1 4 28480 2190 0586 0535 0006 1 4 NUT HEX DBL CHAM M4 X 0 7 3 2MM THK 00000 ORDER DESCRIPTION 3050 0893 9 WASHER FL MTLC 4 0 MM 4 4 MM ID 28480 3050 0893 3050 2007 1 WASHER SHLDR NO 6 169 IN4D 375 IN OD 28480 3050 2007 1400 0249 9 4 CABLE TIE 062 625 DIA 091 WD NYL 06383 PLT1M 8 U1 1826 1181 3 1 IC V RGLTR FXD POS 14 7 15 3V PKG 03406 LM340AK 15 08640 20057 5 INSULATOR SPACER 28480 08640 20057 1200 0043 8 INSULATOR XSTR ALUMINUM 28480 1200 0043 0624 0459 7 SCREW TPG 6 20 7S IN LG PAN HD POZI STL 00000 ORDER BY DESCRIPTION 2190 0918 4 WASHER LK HLCL NO 6
191. 6447 A2F60 0757 0280 3 RESISTOR 1K 1 125W F TC 0 100 24546 4 1 8 0 1001 2961 0698 7196 8 RESISTOR 21 5 1 05W 0 100 24546 C3 1 8 TO 21R5 F A2R62 0698 7196 8 RESISTOR 21 5 1 05W 0 100 24546 C3 1 8 TO 21R5 F A2F63 R66 NOT ASSIGNED A2F67 0757 0438 3 24 RESISTOR 5 11 1 125W 0 100 24546 4 1 8 0 5111 2968 0757 0438 3 RESISTOR 5 11K 1 125W 0 100 24546 C4 1 8 TO 5111 F A2P69 0757 0438 3 RESISTOR 5 11 1 125W 0 100 24546 4 1 8 0 5111 A2R70 R74 NOT ASSIGNED 2975 0698 3157 3 13 RESISTOR 19 6K 1 125W 0 100 24546 4 1 8 0 1962 A2F76 0757 0447 4 RESISTOR 16 2K 1 125W F 0 100 24546 1 8 TO 1622 F 2977 79 NOT ASSIGNED A2RBO 0757 0439 4 4 RESISTOR 6 81 1 125W F 0 100 24546 4 1 8 0 681 1 2 81 0757 0441 8 3 RESISTOR 8 25K 1 125W TC 0 100 24546 C4 1 8 TO 8251 F A2F82 NOT ASSIGNED A2R63 0757 0280 3 RESISTOR 1K 1 125W 0 100 24546 4 1 8 0 1001 A2RB4 86 NOT ASSIGNED A2R87 0757 0442 9 39 RESISTOR 10K 1 125W F TC 0 100 24546 C4 1 8 T0 1002 F A2RB8 R92 NOT ASSIGNED Refer to Section 7 for update information Factory Selected Component Refer to Section 5 A Errata part change 6 13 Replaceable Parts Table 6 3 Replaceable Parts Model 8903B Reference Pat i Mtr Designation N mber D Qty Description Code Mfr Part Number 2 2 NOT ASSIGNED 2 0757 0280 3 RESISTOR 1K 1 125W
192. 69 06352 09969 56289 56289 56289 56289 56289 56289 56289 56289 74970 9 171 9 171 9 171 9N171 9N171 9N171 9N171 9N171 Factory Selected Component Refer to Section 5 Replaceable Parts Mfr Part Number 08903 60300 RPA10X7R103K100V RPA10X7R103K100V RPA10X7R103K100V RPA10X7R103K100V RPA10X7R103K100V RPA10X7H103K100V RPA10X7R103K100V RPA10X7R103K100V RPA10X7R103K100V RPA10X7R103K100V RPA10X7R103K100V RPA10X7f103K100V RPA10X7R103K100V RPA10X7R103K100V RPA10X7R103K100V RPA10X7R103K100V RPA10X7R103K100V RPA10X7R103K100V RPA10X7R103K100V RPA10X7R103K100V RPA10X7R103K100V RPA10X7R103K100V RPA20C0G102J100V RPA20C0G102J100V 150D106X9035R2 RPA20X7R104K50VPT FD112COG2D150G RPE121 105C0G360J200V 150D336X9035SA 1500225 9020 2 150D225X9020A2 150D225X9020A2 150D225X9020A2 150D336X9035SA 1500336 90355 1500336 90355 189 0509 125 1 4150 1 4150 1 4150 1 4150 1 4150 1 4150 1 4150 144150 Errata part change 6 77 Replaceable Parts Reference Designation 8 1 ABDS2 A8DS3 8054 ABR1 ABR2 A8R6 ABR7 ABRS ABS1 ABTPT 2 ABU1 ABU2 ABUS ABUG ABU ABUB ABUS ABU10 1 A8U12 A8U13 A8U14 A8U15 ABU16 8017 ABU18 ABUTS ABU2O A8U21 822 ABVR1 A8Y1 Refer te Seetion 7 for update 6 78 HP Part Number 1990 1110 1990 1110 1990 111
193. 7 0160 4835 7 2 58 60 2 61 0160 4834 6 2 62 69 2 70 0160 4819 7 2 71 76 2 77 0160 4791 4 A2C78 0160 4835 7 2 79 0160 4835 7 2 80 0160 4791 4 2 81 0160 4832 4 2 82 2 2 84 0160 4791 4 2 85 0160 4791 4 2 86 0160 4801 7 2 87 0160 4801 7 2 88 0160 6370 9 2 89 0160 2264 2 2 90 0121 0422 8 2 91 0160 4786 7 2 92 0121 0422 8 A2C93 0160 5549 2 2 94 0160 4832 4 2 95 0160 4832 4 2 96 0150 4832 4 2 97 0160 4835 7 2 98 0150 4835 7 2 99 0160 2237 9 2 100 0160 4786 7 2 101 0160 2236 8 2 103 0160 4801 7 2 104 0160 4832 4 2 105 0160 4791 4 2 106 0160 4801 7 A2C107 0160 4791 4 A2C108 0160 4801 7 A2C109 0121 0527 4 A2C110 0121 0527 4 TRefer to Sertion 7 for update information 6 10 Table 6 3 Replaceable Parts Description Mfr P Code ASSIGNED CAPACITOR FXD 4 7UF 10 35VDC TA 56289 NOT ASSIGNED NOT ASSIGNED CAPACITOR FXD 1UF 10 SOVDC CER 28480 CAPACITOR FXD 1UF 10 50VDC CER 28480 NOT ASSIGNED CAPACITOR FXD 047UF 10 100VDC CER 28480 NOT ASSIGNED CAPACITOR FXD 2200PF 5 100VDC CER 28480 NOT ASSIGNED CAPACITOR FXD 10PF 8 100VDC CER 04 30 28480 CAPACITOR FXD 1UF 4 109 50VDC CER 28480 CAPACITOR FXD 1UF 10 50VDC CER 28480 CAPACITOR FXD 10PF 5 100VDC CER 0 30 28480 CAPACITOR FXD 01UF 10 100VDC CER 28480 NOT ASSIGNED NOT ASSIGNED CAPACITOR FXD 10PF 4 599 100VDC CER 04 30 28480 CAPACITOR
194. 7 0447 4 RESISTOR 16 2K 1 125W F fC 0 100 24545 4 1 8 0 1622 A4R44 0698 3151 7 RESISTOR 2 87 1 125W F TC 0 100 24546 C4 1 8 T0 2871 F A4R45 0698 6343 5 RESISTOR 1 125W F TC 0 4 25 28480 0608 5343 A4R46 0698 6362 8 RESISTOR 1K 1 125W 0 25 28480 0698 5352 A4R47 0757 0422 5 RESISTOR 909 1 125W F 0 100 24546 CA4 1 8 T0 909R F A4R48 0698 6343 5 RESISTOR 1 125W 0 25 28480 0698 6343 4 49 0698 6343 5 RESISTOR 1 125W 0 25 28480 0698 5343 4950 0698 5362 8 RESISTOR 1K 1 125W F 0 25 28480 0698 6362 4851 0898 6362 8 RESISTOR 1K 1 125W F 0 25 28480 0598 6362 A4R52 0757 0280 3 RESISTOR 1K 1 125W 0 100 24546 C4 1 8 TQ 1001 F A4R53 0599 0550 6 1 RESISTOR 620 5 25W CC TC 0 800 28480 0699 0550 4954 0698 0085 Q 2 RESISTOR 2 81K 1 125W F 0 100 24546 4 1 8 0 2611 4955 0698 6350 6 RESISTOR 10K 1 125W 0 25 28480 0698 6260 4956 0598 3160 8 RESISTOR 31 6K 1 125W 0 100 24546 4 1 8 0 3162 TRefer to Section 7 for npdate information Factory Selected Component Refer to Zectiou 2 A Errata part change 6 46 rev 16FEB90 Model 8903B Reference Qty Designation Number 4 A4R57 0698 3160 8 4858 0757 0280 3 A4PS9 0757 0438 3 A4F60 0757 0442 9 A4F61 0698 3152 8 A4F62 0698 6360 A4PF63 0698 8822 9 A4R64 0757 0465 6 4965 0757 0438 3 A4R66 0698 3150 6 4967 0698 3153 9 5 4968 075
195. 7 1108 6 1 A4F69 0757 0279 0 A4R70 0698 6630 3 A4PT1 0698 6360 6 A4R72 0757 1094 9 A4F73 0698 3136 8 2 A4R74 0757 1094 9 A4R76 0698 8822 9 A4R77 0698 8822 9 A4R78 0698 0084 9 A4R79 0757 0440 7 A4RBO 0757 0442 9 A4R81 0757 0442 9 A4RB2 0767 0438 3 A4F83 0698 3157 3 A4R84 0757 0280 3 4 85 2100 3054 6 2 4886 0698 3223 4 1 4887 0698 3459 8 2 A4RBB 0757 0280 3 A4R89 0757 0438 3 A4F90 0699 0526 6 A4F91 2100 3056 8 1 A4R92 0698 8799 9 1 A4R93 2100 3109 2 1 4 94 0698 3266 5 2 4 95 0638 6630 3 A4R96 0698 3266 5 A4R97 0757 0438 3 A4R98 0698 6630 3 A4R99 0757 0280 3 A4R100 0757 0442 9 49101 0698 3243 8 1 A4R102 A4R103 A4R104 0757 0470 3 A4R105 0757 0200 7 AaR106 A4R107 0757 0464 5 2 TRefer te Section 7 for update information rev 16FEB90 HP Part Table 6 3 Replaceable Parts Description Mfr Code Replaceable Parts Mfr Part Number 08903 60283 SERIAL PREFIX 2816A AND ABOVE HP8903B RESISTOR 31 6 1 125W TC 0 100 24546 RESISTOR 1K 1 125W 0 100 24546 RESISTOR 5 11K 1 125W F 0 100 24546 RESISTOR 10K 1 125W TC 0 100 24546 RESISTOR 3 48 1 125W F 0 100 24546 RESISTOR 10K 1 125W 0 25 28480 RESISTOR 6 81 1 125W 0 100 28480 RESISTOR 100K 1 125W 0 100 24546 RESISTOR 5 11K 1 125W TC 0 100 24546 RESISTOR 2 37K 1 125W TC 0 100 24546 RESISTOR 3 83K 1 125W F TC 0 100 24546
196. 79 0 A3R96 0757 0280 3 A3R97 0698 6360 6 0698 6630 3 7 A3R99 0698 6360 6 A3R100 0598 6360 6 101 0699 0594 8 1 A3R102 0698 6630 3 A3TP1 1251 0600 0 2 1251 0600 0 1251 0600 0 4 1251 0600 0 5 1251 0600 0 A3TP6 1251 0600 0 7 1251 0600 0 1251 0600 0 9 1251 0600 0 10 1251 0600 0 11 1251 0600 0 12 1251 0600 0 13 1251 0600 0 14 1251 0600 0 15 1251 0600 0 A3U1 1826 1491 9 4 A3U2 1826 0025 2 2 A3U3 1826 0025 2 A3U4 1826 0014 9 3 A3U5 1826 0783 9 tRefer te Section 7 for upilate information 16 90 Table 6 3 Replaceable Parts Description RESISTOR 6 81K 1 125W F TC 0 100 RESISTOR 19 6K 1 125W F TC 0 100 RESISTOR 19 6K 1 125W F TC 0 100 RESISTOR 22K 2 125W 0 100 RESISTOR 22K 2 125W F TC 0 100 RESISTOR 1 47 1 125W TC 0 100 RESISTOR 1 47K 1 125W F TC 0 100 RESISTOR 1 78K 1 125W F TC 0 100 RESISTOR 1 78K 1 125W 0 100 RESISTOR 2 15K 25 125W 0 100 RESISTOR 2 15K 25 125W 0 100 RESISTOR 511 1 125W 0 100 RESISTOR 511 1 125W F 0 100 RESISTOR 11 111K 1 125W 0 50 RESISTOR 11 111 1 125W 0 50 RESISTOR 13 3K 1 125W 0 50 RESISTOR 13 3K 1 125W F 0 50 RESISTOR 10K 1 125 F 0 25 RESISTOR 6 19 1 125W TC 0 100 RESISTOR 3 16K 1 125W TC 0 100 RESIST
197. 8 TO 21R5 F A2R115 0698 7253 8 RESISTOR 5 11K 1 05W F 0 100 24546 C3 1 8 TO 511 1 F A2H116 0698 7 196 8 RESISTOR 21 5 t 05W F TC z 04 100 24545 C3 1 8 TO 21R5 F A2R117 0598 7196 8 RESISTOR 21 5 1 05W TC 0 100 24546 C3 1 8 TO 21R5 F A2R118 0698 7253 8 RESISTOR 5 11K 1 05W F 0 100 24546 C3 1 8 T0 5111 F A2R119 NOT ASSIGNED A2R120 NOT ASSIGNED A2R121 0699 0405 0 RESISTOR 15 93K 1 25W F 0 25 28480 0699 0405 A2R122 0698 6348 0 RESISTOR 1 125W TC 0 25 28480 0698 6348 A2R123 0698 3455 4 RESISTOR 281K 1 125W F TC 0 100 24546 4 1 8 0 2613 A2R124 0698 7256 1 RESISTOR 6 81 1 05W F TCz 04 100 24546 3 1 8 0 6811 2 125 0698 7255 0 RESISTOR 6 19K 1 05W F 0 100 24546 3 1 8 0 6191 A2R126 0698 7255 0 RESISTOR 6 19K 1 05W F 0 100 24546 3 1 8 0 6191 A2R127 0698 7267 4 3 RESISTOR 19 6K 1 05W TCz 04 100 24546 C3 1 8 TO 1962 F A2R128 0698 7284 5 4 RESISTOR 100K 1 05W F TC 0 100 24546 C3 1 8 TO 1003 F A2R129 0698 7284 5 RESISTOR 100K 1 05W TC 0 100 24546 C3 1 8 TO 1003 A2R130 0698 7284 5 RESISTOR 100K 1 05W F 0 100 24546 3 1 8 0 1003 2 131 0698 7284 5 RESISTOR 100K 1 05W F 0 100 24546 3 1 8 0 1003 29132 0698 7260 7 3 RESISTOR 10K 1 OSW F 0 100 24546 C3 1 8 TO 1002 F A2R133 0698 7260 7 RESISTOR 10K 1 05W F TC 0 100 24546 C3 1 8 TO 1002 F A2R134 0698 7188 8 1 RESISTOR 10 1 05W F 0 100 24546 0698 7188 A2TP1 1251
198. 80 1901 0376 28480 1901 0050 28480 1901 0050 28480 1901 0880 28480 1901 0050 28480 1901 0880 28480 1901 0050 28480 1901 0050 28480 1901 0050 28480 1901 0050 28480 1901 0050 28480 1901 0376 28450 1901 0050 28480 1901 0376 28480 1901 0880 26480 1901 0050 28480 1901 0880 28480 1901 0050 28480 1901 0050 28480 0490 0916 28480 0490 0916 28480 0490 1484 28480 0490 1484 28480 0490 1484 28480 0490 1484 28480 9140 0114 28480 9100 2430 28480 9140 0114 Errata part change 6 11 6 12 Replaceable Parts Reference HP Part C Qty Designation Number D A2MP1 4040 0748 3 8 1480 0116 8 1 A2MP2 4040 0750 7 1 1480 0116 8 A2MP3 0380 1773 2 8 A201 A2Q2 1855 0277 7 3 A2Q3 1853 0459 3 2 A2Q4 1855 0277 7 A2Q5 1855 0277 7 A2Q6 1853 0459 3 A2Q7 209 08903 80035 3 1 A2Q8 1855 0642 0 A2QS 2010 1855 0642 0 A2R1 A2Fo 0757 0159 5 2 A2R3 0699 0413 0 2 A2RA 0699 0526 6 3 A2R5 0698 8825 2 3 A2R6 0699 0402 7 2 A2R7 0699 0405 0 2 2 8 0698 6348 0 6 A2R9 0698 3455 4 2 A2R10 A2R11 A2R12 0698 3152 8 3 A2R13 0757 0465 6 14 A2R14 0757 0290 5 9 A2R15 0757 0465 6 A2R16 A2R17 0757 0833 2 2 A2R18 2919 2920 0698 3150 6 5 2921 2922 0598 3150 6 A2R23 R25 A2R26 0698 7196 8 28 A2R27 0698 7196 8 A2R28 0698 5447 0 2 A2R29 0699 0412 9 2 2830 0699 0412 9 A2F31 0698 7195 8 2832 0698 7 196 8 2833 0699 0407 2 1 A2R34 0698 7 196 8 2835 0698 7 196 8 tRefer to Section 7 fer update information Table 6 3 Replaceable Parts
199. 820 1689 SN74ULSOJN 1820 1689 5 741505 SN74LS74AN SN74LSOSN SN74LS04N SN7400N SN74LS 138 SN74LS26N 3861 1200 0554 SN74LS 14N SN7438N A Errata part change rev JGFEB90 Model 8903 Tuble 6 3 Replaceable Parts Reference HP Part C Qty Description Mfr Designation Number D Code 9 08902 60297 7 REMOTE INTERFACE ASSEMBLY 28480 A9C2 0180 2111 1 33uF 35 V 56289 A9C4 0180 0197 8 1 CAP FXD 2 2uF 20 V TA 56289 9 5 0160 4832 4 12 0 01uF 100 V 09969 A9C6 0160 4832 4 CAP FXD 0 01uF 100 V 09969 A9C7 0160 4832 4 CAP FXD 0 01uF 100 V 09969 A9CB 0160 4832 4 CAP FXD 0 010 100 V 09969 9 9 0160 4832 4 CAP FXD 0 01 100 V 09969 A9C10 0160 4832 4 CAP FXD 0 01uF 100 V 09969 A9C11 0160 4832 4 0 01 100 V 09969 A9C12 0160 4832 4 CAP FXD 0 01uF 100 V 09969 A9C13 0160 4832 4 CAP FXD 0 01uF 100 V 09969 A9C14 0160 4832 4 CAP FXD 0 01uF 100 V 09969 A9C15 0160 4832 4 0 01uF 100 V 09969 9 16 0160 4832 4 CAP FXD 0 01uF 100 V 09969 A9C17 0160 4833 5 2 CAP FXD 0 022uF 100 V 09969 A9C18 0160 4814 1 CAP FXD 150pF 100 V 09969 A9C19 0160 4833 5 CAP FXD 0 022uF 100 V 09969 1 1901 0518 8 1 DIODE SCHOTTKY SM SIG 12403 A9R 0698 3444 1 2 RESISTOR 316 1 125W TC 0 100 12498 AgR2 1810 0206 g 3 NETWORK RES B SIP 10 0K OHM X 7 C1433 ASRS 1810 0206 8 NETWORK RES 8 SIP 10 0K OHM X 7 1433 AQR4 0698 0084 9 1 RESISTOR 2 15K 1 125W TF 0 100 24546
200. 8480 1901 0050 7 1901 0050 3 DIODE SWITCHING 80V 200MA 2NS DO 25 28480 1901 0050 ABCRB 1901 0050 3 DIODE SWITCHING 80V 200MA 2NS DO 35 28480 1901 0050 ABCRS 1901 0539 3 1 DIODE SM SIG SCHOTTKY 28480 1901 0539 Refer to Section 7 fer update information Fartory Selected Component Refer to Seetion A Errat part chauge rev 1GFEB9O 6 73 Replaceable Parts Mode 8903B Tuble 6 3 Replaceable Parts Reference HP Part C D Mfr escription Mfr Part Number Designation Number D d P Code ABDS 1990 1110 5 4 LED LAMP LUM INT 1 5 MCD IF 15 28480 1900 1110 8062 1990 1110 5 4 LED LAMP LLIM INT 1 5 MCD 15 28480 1990 1110 A80S3 1990 1110 5 4 LEO LAMP LUMANT 1 5 IF 15MA MAX 28480 1990 1110 A8DS4 1990 1110 5 4 LED LAMP LUM INT 1 5 MCD IF 15MA MAX 28480 1990 1110 ABJ1 1200 0507 9 1 SOCKET IC 16 CONT OIP SLDR 28480 1200 0507 1 4040 0748 3 EXTR PC POLYC 062 8D THKNS 28480 4040 0748 1480 2116 8 PIN GRV 062 IN DIA 25 IN LG STL 28480 1480 0116 2 4040 0747 2 1 EXTR PC GRA POLYC 062 BD THKNS 28480 4040 0747 1480 0116 8 PIN GRV 052 IN DIA 25 IN LG STL 28480 1480 0116 ABMP3 NOT ASSIGNED Asai 1854 0810 2 1 TRANSISTOR NPN PO 625MW 200MHZ 26480 1854 0810 ABR1 0757 0401 o RESISTOR 100 1 125W F TC 0 100 24546 4 1 8 10 101 0698 3440 7 1 RESISTOR 196 1 125W TC 04 100 24546 1 8 TO 196R F 1810 0286 2 1 NETWORK CAPACITOR SIP
201. 8903B Mfr Part Number 4 1 8 9 15981 MF4C 1 8 T9 3202 B MF4C 1 8 T9 6402 B MF4C1 8 T9 1283 8 MF4C 1 8 T9 2563 B 0698 8958 0698 8827 4 1 8 0 1001 4 1 8 0 1001 4 1 8 0 1002 4 1 8 0 1001 4 1 8 0 1962 4 1 8 0 1962 C4 1 8 TO 1962 F 4 1 8 0 1962 4 1 8 0 5111 C4 1 8 T0 1002 F 4 1 8 0 1002 4 1 8 0 5111 C4 1 8 TO 1002 F C4 1 8 TO 1003 F 4 1 8 1001 C4 1 8 10 1003 F 4 1 8 0 2151 4 1 8 0 2151 0698 6360 0698 6350 4 1 8 0 3162 4 1 8 0 1003 4 1 8 0 8001 4 1 8 0 3161 C4 1 8 T0 5112 F C4 1 8 TO 2052 F 4 1 8 0 1002 C4 1 8 TO 2153 F C4 1 8 TO 1003 F 2100 3355 2100 3355 4 1 8 70 1953 4 1 8 0 1963 C4 1 8 T0 511R F C4 1 8 TO 511R F C4 1 8 TO 51 15 F C4 1 8 TO 5 1 1R F MF4C 1 8 T0 6191 F 421 8 0 6191 4 1 8 10 3161 4 1 8 0 3161 4 1 8 0 6811 A Errata part change rev 161 EB90 Moael 8903 Reference Qty Designation Number 6 0757 0439 4 A3R77 0698 3157 3 A3R78 0698 3157 3 A3R79 0757 0956 0 2 A3R80 0757 0956 0 A3RB1 0757 1094 9 7 A3R82 0757 1094 9 A3R83 0757 0278 9 4 A3R84 0757 0278 9 A3R85 0698 8869 4 2 A3RBE 0698 8869 4 A3R87 0757 0416 7 A3R88 0757 0416 7 A3R89 0698 4339 5 2 A3R90 0698 4339 5 A3R91 0698 8655 6 2 A3R92 0698 8655 6 A3R93 0698 6360 6 A3RS4 0757 0290 5 5 0757 02
202. 8903B Mfr Part Number 08903 60283 SERIAL PREFIX 2816A AND ABOVE HP8903B LF13201D 17 2 5043 tH5043CDE DGZ01BK LM218H TLO72ACJG 1826 1097 SN74LSOON 1902 0943 1902 0064 1902 3024 1 827 1902 0953 1251 4670 Errata part change rev 1GFEB90 Model 8903B Replaceable Parts Table 6 3 Replaceable Parts Reference Part Mfr Designation Number D Qty Description Code Mfr Part Number 5 5 08903 60005 6 1 OSCILLATOR ASSEMBLY 28480 08903 60006 ASC1 0160 2055 9 61 CAPACITOR FXD O1UF 80 20 100 0 CER 28480 0160 2055 ASC2 0160 2055 9 CAPACITOR FXD O1UF 80 20 100VDC CER 28480 0160 2055 5 0160 2055 9 CAPACITOR FXD 010 80 20 100VDC CER 28480 0160 2055 ASCA 0160 2055 9 CAPACITOR FXD 010 80 20 100VDC CER 28480 0160 2055 5 5 0160 2055 9 CAPACITOR FXD O1UF 80 20 100VDC CER 28480 0160 2055 ASCE 0160 2055 9 CAPACITOR FXD O1UF 80 20 100VDC CER 28480 0160 2055 ASC 7 0160 2055 9 CAPACITOR FXD 01UF 80 20 100VDC CER 28480 0160 2055 5 0160 2055 9 CAPACITOR FXD 010 80 20 100VDC CER 28480 0160 2055 5 9 0160 4590 1 CAPACITOR FXD 18UF 1 200VDC 28480 0160 4590 5 10 0160 5032 8 CAPACITOR FXD 0223UF 1 200VDC 28480 0160 5032 5 11 0160 3293 9 CAPACITOR FXD 2470PF 1 100VDC MICA 28480 0160 3293 5 12 0180 2620 5 CAPACITOR FXD 2 2UF 10 SOVDC 25088 D2R2GS 1850K ASC13 0180 2620 6 CAPACITOR FXD 2 2UF 10 50 0 25088 DeR2GS1B50K 5 14
203. 9 PKG IC OP LOW DRIFT TO 99 PKG IC OP AMP GP DIP PKG IC WB 8 DIP C PKG IC OP AMP GP DIP PKG IC OP AMP wB TO 99 PKG IC SWITCH ANLG QUAD 16 DIP C PKG IC OP AMP WB TO 99 PKG IC SWITCH ANLG QUAD 16 DIP C PKG IC OP AMP LOW BIAS H IMPD QUAD 14 DIP P IC GATE TTL LS NAND QUAD 2 INP IC OP AMP LOW DRIFT TO 99 PKG OP WB 99 IC OP AMP LOW BIAS H IMPD DUAL 8 DIP C IC OP AMP GP DIP PKG IC OP AMP WB 8 DIP C PKG LOW BIAS H IMPD QUAD 14 DIP P MULTIPLXR ANLG 16 DIP C IC COMPARATOR GP QUAD 14 DIP P PKG OP WB 8 DIP C Mfr Code 28480 28480 28480 28480 28480 28480 28480 28480 25456 28480 28480 24546 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 07263 07263 01295 06665 01295 34371 17856 34371 17856 04713 01295 07263 34371 02195 01295 06665 04713 06665 01295 06665 Factory Selected Refer fa Section Replaceable Parts Mtr Part Number 08903 60283 SERIAL PREFIX 2816A AND ABOVE HP8903B 0698 6631 0698 6631 0698 6343 0698 8607 0698 7248 0699 0069 0698 6360 2100 3274 4 1 8 1623 0698 8615 0698 4543 4 1 8 1783 0837 0239 1251 0600 1251 0600 1251 0600 1251 0600 1251 0600 1251 0600 1251 0600 1251 0600 1251 0600 1251 0600 1251 0600 UA714LHC UA714LHC LM201AL 17 2 LM201AL HA2 2625
204. 90 0006 ORDER DESCRIPTION 2420 0002 3050 0227 1884 0276 2190 0006 ORDER BY DESCRIPTION 2420 0002 3050 0227 26000 26000 26000 26000 25000 26000 2N2222A A Errat part change rev 16 Model 8903 Replaceable Parts Table 6 3 Replaceable Parts Reference HP Part D Mfr Oty escription Mfr Part Number Designation Number D P Code A13R1 0757 0401 0 RESISTOR 100 1 125W F TC 0 100 24546 4 1 8 0 101 A13R2 0698 3429 2 1 RESISTOR 19 6 1 125W F 0 100 03888 55 1 8 0 19 5 A13R3 0757 0401 0 RESISTOR 100 1 125W 0 100 24545 C4 1 8 TO 101 F A13R4 0757 0440 7 RESISTOR 7 5K 1 125 F 0 100 24545 4 1 8 0 7501 A13R5 8110 0180 0 1 RIBBON RES 157 OHM FT 0253X 0625 28480 8110 0180 A13R6 0757 0460 1 1 RESISTOR 61 9K 1 125W TCx0 100 24546 4 1 8 0 6192 A13R7 0757 0280 3 RESISTOR 1K 19e 125W F TC20 100 24546 4 1 8 1001 A13R8 0698 0083 8 RESISTOR 1 96K 1 125W F 0 100 24540 4 1 8 1961 13 9 0757 0394 0 RESISTOR 51 1 1 125W 0 100 24546 4 1 8 0 51 1 A13R10 0757 0394 0 RESISTOR 51 1 1 125W 0 100 24546 4 1 8 0 51 1 13 11 0757 0290 5 RESISTOR 6 19K 1 125W F TC 0 100 19701 4 1 8 0 6191 13 12 0698 4020 1 RESISTOR 9 53K 1 125W F 0 100 24546 4 1 8 0 9531 A13R13 0757 0274 5 RESISTOR 1 21K 1 125W TC 0 100 24546 C4 1 8 TO 1211 F A13R14 0757 0401
205. 921 7 AGU11 08903 80013 7 6012 08903 80014 8 A6U13 1826 0921 7 A6U14 1820 1197 9 A6VR1 1902 1307 5 6 2 1902 1397 5 A6VR3 1902 0956 2 6 6 1902 0052 8 ABW 8159 0005 0 ABW2 8159 0005 0 tRefer to Section 7 for update tuformation rev 1GFEB90 Qty Table 6 3 Replaceable Parts Description Mfr P Code CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SO 284B0 CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ 28480 IC OP AMP LOW NOISE 8 DIP C PKG 52063 IC OP AMP LOW NOISE 8 DIP C PKG 52063 LOW NOISE 8 DIP C 52063 IC DRVR TTL AND DUAL 2 INP 01295 IC SWITCH ANLG QUAD 16 DIP C PKG 17856 IC LOW NOISE 8 DIP C PKG 52063 IC TIMER TTL MONO ASTBL 01295 IC COMPARATOR GP QUAD 14 DIP C PKG 04713 IC OP AMP LOW NOISE 8 DIP C PKG 52063 D A 10 BIT 16 CBRZ SDR CMOS 28480 PROM 1816 0816 28480 PROM 1816 0916 28480 D A 10 BIT 16 CBRZ SDR CMOS 28480 IC GATE TTL LS NAND QUAD 2 INP 01295 DIO ZNR 12V 5 28480 DIO ZNR 12V 5 28480 DIODE ZNR 22V 5 DO 35 PDz 4W TC 093 28480 NOT ASSIGNED DIODE ZNR 15v 5 DO 35 PDz 4W TC z 087 28480 RESISTOR ZERO OHMS 22 AWG LEAD DIA 28480 RESISTOR ZERO OHMS 22 AWG LEAD DIA 28480 Factory Selected Camponent Ref to Seetien 5 Replaceable Parts Mfr Part Number 1251 0500 1251 0600 XR5534ACN XRSS34ACN XR5534ACN SN7254518P DG2018K XR5534ACN NESSSP LM339J 5534 1826 0921 08903 80013 08703 80014 1826 0921 SN74LSOON 1902 1397 1902 1397
206. A2 A1 BEHIND FRONT PANEL Service Model 8903B loose to facilitate the use of general purpose equipment usually an oscilloscope If a slightly out of tolerance condition is suspected the test can usually be run more rigorously paying greater attention to measurement accuracy Troubleshooting on the block diagram level normally utilizes User and Service Special Functions while that on the schematic level often utilizes Direct Control Special Functions Direct Control Special Functions will require some study of their operation before using them for the first time 8 6 Model 8903 Service 8 20 SPECIAL FUNCTIONS 8 21 General Special Functions extend user control of the instrument beyond that normally available from the front panel They are intended for the user who has an understanding of the instrument and the service technician who needs arbitrary control of the instrument functions During normal use the Audio Analyzer safeguards itself against invalid measurements Safeguards come in the form of automatic tuning and ranging overvoltage protection and error messages When Special Functions are used some of these safeguards are removed depending on the Special Function selected and thus there is a degree of risk that the measurement may be invalid However there is no risk of damage to the instrument To enter a Special Function enter the Special Function code usually a prefix decimal and suffix then press
207. ABOVE 5 59 0160 5254 6 ASCO0 0160 5254 6 2450A TO 2520A ASCRI 1901 0376 6 AS5CR2 1901 0376 6 ASCR3 1901 0376 6 ASCR4 1901 0376 6 ASCRS5 1901 0376 ASCRO 1901 0880 7 ASCR 1901 0376 6 ASCRS 1901 0376 6 ASCRO 1901 0376 6 ASCRIO 1901 0376 6 ASCRI 1901 0376 6 ASCRI2 1901 0376 6 ASCR13 1901 0376 6 A5CR14 1901 0376 6 ASCR15 1901 0376 6 2601 AND ABOVE ASCR 1901 0050 3 ASCH2 1901 0050 3 ASCRI 1801 0050 3 ASCH 1901 0050 3 ASCHS 1901 0050 3 ASCRG 1901 0880 7 ASCR 1901 0880 7 ASCRS 1901 0880 7 ASCRY 1901 0880 7 ASCRIO 1901 0880 7 5 1901 0880 7 5 12 1901 0880 7 A5CR13 1901 0880 ASCR14 1901 0880 7 5 15 1901 0880 7 Refer to Section 7 for npdate information Tuble 6 3 Replaceable Parts Description Mfr P Code CAPACITOR FXD 8 2PF 25 500VDC CER 28480 CAPACITOR FXD 1UF 20 50 0 CER 28480 CAPACITOR FXD 1000PF 10 1KVDC CER 28480 CAPACITOR FXD 1UF 10 35VDC 56289 CAPACITOR FXD 047UF 2 100VDC 28480 CAPACITOR FXD 01UF 480 20 100VDC CER 28480 CAPACITOR FXD O1UF 80 20 100 0 CER 28480 CAPACITOR FXD 12PF 5 200VDC CER 30 28480 CAPACITOR FXD 1UF 10 35VDC 56289 CAPACITOR FXD 01UF 80 20 100VDC CER 28480 CAPACITOR FXD 1UF 10 35VDC 56289 CAPACITOR FXD 01UF 80 209 100VDC CER 28480 CAPACITOR FXD 010 80 20 100VDC CER 28480 NOT ASSIGNED NOT ASSIGNED CAPACITOR FXD 1 5PF 25PF 100VDC CER 28480 CAPACITOR FXD 1 5PF 25PF 100VDC CER 28480 DIODE GEN P
208. APACITOR FXD 20 200VDC 28480 CONNECTOR 10 PIN POST TYPE 28480 RESISTOR 21 5 1 05W TC zO 100 24546 RESISTOR 21 5 t 05W 0 100 24546 RESISTOR 5 7K 1 125W F 0 100 24545 RESISTOR 7 5K 1 05W 0 100 24545 RESISTOR 82 5K 1 05 F 0 100 24546 RESISTOR 484 1 05W F TC 0 100 24546 RESISTOR TRMR 200 1025 C SIDE ADJ 1 28480 RESISTOR 1 33K 1 OSW 0 100 24546 RESISTOR 7 5K 1 05W TC 0 4 109 24546 RESISTOR 7 87 1 125W F TC 0 100 24546 RESISTOR 3 48K 1 OSW F 0 100 24546 RESISTOR 7 5K 1 05W F 0 100 24546 RESISTOR 4 64K 1 05W 0 100 24546 RESISTOR 6 65K 1 125W F TC 0 100 24546 RESISTOR 1 91K 1 125W 0 100 24546 RESISTOR 4 64K 1 05W F 0 100 24546 iC OP AMP LOW BIAS H IMPD QUAD 14 DIP P 01295 Factory Selected Compouent Refer te Section 5 Replaceable Parts Mfr Part Number 08903 60152 08903 60162 D1ROGS 1A50K D1ROGS1ASOK 0150 6323 0160 4759 0160 6324 0160 4759 0160 6325 0160 6606 1251 6063 C3 1 0 TO 21R5 F C3 1 8 TO 21R5 F 4 1 8 70 6701 C3 1 8 TO 7501 F 3 1 8 70 8252 C3 1 8 TO 454R F 2100 3350 C3 1 8 TO 123 1 F C3 1 8 TO 750 t F 4 1 8 10 7871 3 1 8 70 3481 1 8 10 7501 3 1 8 70 4641 4 1 8 0 6651 4 1 8 10 1911 3 1 8 0 4641 TL7LOACAO0 A Errat part change G 2 5 Model 8903 Reference HP Part C Qty Designation Number D
209. ASRS 0757 0416 7 1 RESISTOR 511 1 125W TF TC 0 100 12498 A9R6 1810 0136 3 1 NETWORK RES 10 SIP MULTI VALUE 01121 A9R7 0698 0083 8 1 RESISTOR 1 96K 1 125W TF TC 0 100 12498 A9RB 0690 3444 1 RESISTOR 316 4 195 125W TF TC 204 100 12498 ASRS 0757 0442 9 1 RESISTOR 10K 1 125W TC 0 100 12498 A9R10 1810 0206 8 NETWORK RES 8 SIP 10 0K OHM X C1433 951 3101 1973 7 1 SWITCH DIP SL 7 14 0 1 50VOC 11236 1 1251 0600 8 CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SO 12360 A9TP2 1251 0600 0 CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SO 12350 ASTP3 1251 0600 CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ 12360 ASTP4 1251 0600 0 CONNECTOR SGL CONT PIN 1 14 5 52 SO 12360 A9TP5 1251 0600 0 CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SO 12360 A9TP6 1251 0500 0 CONNECTOR SGL CONT 1 14 5 52 SO 12360 ASTP7 1251 0600 0 CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ 12360 ASTP9 1231 0600 0 CONNECTOR SGL CONT PIN 1 14 MM BSC S2 SO 12360 A9U1 1820 1112 8 3 IC FF TTL LS D TYPE POS EDGE TRIG 01295 A9U2 0890 1 80004 4 1 PROM 1816 0915 28480 A9U3 1820 1112 8 FF TTL LS D TYPE POS EDGE TRIG 01295 A9UA 1820 1417 6 2 GATE TTL LS NAND QUAD 2 INP 01295 ASUS 1820 2740 0 1 TTL LS MAGTD 2 INP B EIT 34335 tRefer to Section 7 foy update information Factory Selected Component Refer te Section 5 rev 1GFE B90 Replaceable Parts Mfr Part Number 08903 60297 150D336X9035SA 1500225 9020 2 RPA10X7R103K100V R
210. B 7 5 CABINET PARTS COLOR CHANGE 1 2910A and above NOTE Serial prefix 2910A changes the color of the instrument covers and acces sories The old color cover and accessories are no longer available If your instrument has serial prefixes 2908A and below and you must replace one of these parts we recommend that you order the full set of covers and ac cessories using the part numbers for serial prefix 2910 and above fected cabinet parts are MP1 MP4 6 8 10 17 MP19 and MP20 see Table 6 3 7 2 rev 20JUN9I Model 8903 Service Section 8 SERVICE 8 1 INTRODUCTION This section contains information for troubleshooting and repairing the Audio Analyzer Included are trou bleshooting tests block and schematic diagrams and principles of operation 8 2 SERVICE SHEETS The foldout pages in the last part of this section are block diagrams BD1 through BDS and service sheets 1 to 21 and A to C 8 3 Block Diagrams Block Diagram 1 is an overall block diagram that breaks the instrument into functional sections It serves as an index to the other block diagrams as a starting point for troubleshooting refer to General Troubleshooting paragraph 8 16 The other block diagrams BD2 through BD5 cover the Measurement Source Digital and Power Supply Sections of the instrument respectively These block diagrams break the sections into physical assemblies and serve as an index to the schematic s
211. B90 Table 6 3 Replaceable Parts Description Mfr Code DIODE SWITCHING 80V 200 2 5 DO 35 28480 EXTR PC BLK POLYC 062 BD THKNS 28460 PIN GRV 062 IN DIA 25 IN LG STL 28480 EXTR PC GRN POLYC 062 BD THKNS 28480 PIN GRV 062 IN DIA 25 IN LG STL 28480 PLUG HOLE FOR 187 D HOLE NYL 02768 TRANSISTOR PNP 2 2907 5 TO 18 PD 400MW 04713 TRANSISTOR NPN 2N2222A SI TO 18 500MW 04713 TRANSISTOR J FET 2N4391 N CHAN D MODE 01295 TRANSISTOR J FET 2N4391 N CHAN D MODE 01295 TRANSISTOR J FET 2N4391 N CHAN D MODE 01295 TRANSISTOR J FET 2N4391 N CHAN D MODE 01295 TRANSISTOR J FET 2N4391 N CHAN D MODE 01295 TRANSISTOR J FET 2N4391 N CHAN D MODE 01295 TRANSISTOR J FET 2N4391 N CHAN D MODE 01295 TRANSISTOR J FET 2N4391 N CHAN D MODE 01295 TRANSISTOR J FET 2N4391 N CHAN D MODE 01295 TRANSISTOR J FET 234391 N CHAN D MODE 01295 TRANSISTOR J FET 2N4391 N CHAN D MODE 01295 TRANSISTOR J FET 2N4391 N CHAN D MODE 01295 TRANSISTOR J FET 2N4391 N CHAN D MODE 01295 TRANSISTOR J FET 2N4391 N CHAN D MODE 01295 TRANSISTOR J FET 2N4391 N CHAN D MODE 01295 TRANSISTOR J FET 244391 D MODE 01295 TRANSISTOR J FET 2N4391 N CHAN D MODE 01295 TRANSISTOR J FET 2N4391 N CHAN D MODE 01295 TRANSISTOR J FET 2N4391 N CHAN D MODE 01295 TRANSISTOR J FET 2N4391 N CHAN D MODE 01295 TRANSISTOR J FET 2N4391 N CHAN D MODE 01295 TRANSISTOR J FET 2N4391 N CHAN D MODE 01295 TRANSISTOR J FET 2N4391 N CHAN D MODE 01295 TRANSISTOR J FET 2N4391 N CHAN
212. BSC SZ SO 28480 ASTP2 1251 0600 9 CONNECTOR SGL CONT PIN 1 14 MM BSC S2 SO 29480 A9TP3 1251 0500 0 CONNECTUR SGL CONT PIN 1 14 MM BSC SZ SQ 28480 ASTP4 1251 0600 0 CONNECTOR SGL CONT PIN 1 14 MM BSC S2 SO 28480 9 5 1251 0600 0 CONNECTOR SGL CONT PIN 1 14 5 52 SQ 28480 A9TP6 1251 0600 0 CONNECTOR SGL CONT 1 14 MM BSC SZ SQ 28480 ASTP7 1251 0600 0 CONNECTOR SGL CONT 1 14 MM BSC SZ SQ 28480 A9TP8 1251 0600 0 CONNECTOR SGL CONT PIN 1 14 BSC SZ SQ 28480 1251 0600 0 CONNECTOH SGL CONT PIN 1 14 MM BSC S2 SO 28480 Refer to Seetion 7 for update information Yactery Selected Component Refer te Seetiow 1 rev 1GFEBIO Replaceable Parts Mfr Part Number 08903 60118 150D 106X9020B2 1500335 901082 0160 2055 1500225 9020 2 0150 2055 0160 2055 0160 2055 0160 2055 0160 2055 0160 2055 Ur C Ot C 0160 20 0160 20 0160 205 0160 205 0160 205 Ch 0160 2055 0160 0574 DM15F151J0300VV ICR 0150 0574 1901 0518 4040 0748 1480 0116 4040 0756 1480 0116 1 8 TO 316R F 208A103 208A 103 4 1 8 0 1961 4 1 8 10 51 13R F 1810 0136 C4 1 8 TO 1961 F C4 1 8 10 3 15R F 4 1 8 10 1002 3101 1973 1200 0485 1251 0600 1251 0500 1251 0500 1251 0600 1251 0600 1251 0600 1251 0600 1251 0600 1251 0600 Errats part change 6 79 Replaceable Parts Reference HP Part Designation Number A9 ASU 1820 1112 8 902 08901 80004 4 1 A9UJ 182
213. C INV TTL LS HEX 14 A9U15 1820 0054 5 1 IC GATE TTL NAND QUAD 2 INP A9U16 1820 1216 3 JC DCDR TTL LS 3 TO 8 LINE 3 INP A9U17 1820 1417 6 IC GATE TTL LS NAND QUAD 2 INP A9U18 1820 2983 3 1 IC PERIPHERAL INTERFACE ADAPTER CLK 2MMZ A9U19 1820 1416 5 1 IC SCHMITT i TTL LS INV HEX 1 INP ASU20 1820 0621 2 1 BFR TTL QUAD 2 INP A9XS1 1200 0487 2 1 SOCKET IC LYP 14 CONT DIP SLDR ASXU18 1200 0654 7 1 SOCKET IC DiF 40 CONT DIP DIP SLDR 1480 0116 8 2 PIN GRV 062 IN DIA 25 IN LG STL 4040 0748 3 1 EXTR PC BD BLK FOLYC 062 IN BD THKNS 4040 0756 3 1 WHT POLYC 062 IN 8D THKNS 7121 4611 2 1 LABEL INFORMATION 15 IN WD 6 IN LG 7121 4611 2 1 LABEL INFORMATION 15 IN V D 6 IN LG tRefer te Section 7 far 4 information Pactory Selected Comypousrent Dereler ta Seetion 0 6 82 Model 8903B Mfr Part Number 74LS260N SN74LSO3N MC3446N SN74LSO3N MC3446N SN74LSO5N SN74LS74AN SN74LS05N SN74LS04N SN7400N SN74LS138N SN74LS26N MC68B21F SN74LS14N SN7438N 14 820 90 C8 40 01 GP24 063 X 250 17 4040 0748 4040 0756 L01003 01003 A Errata port change rev GF EB90 Model 8903 Reference Designation A10 A10 A10J1 A10MP1 A1OMP2 Refer to Section 7 for update information rev IGFEBIO HP Part Number 08903 60108 1251 3283 0380 0644 2190 0034 1530 1098 2190 0019 2200 0100 2260 0002 Qty D N Ta
214. CAPACITOR FXD 6800PF 1 200VDC 28480 0160 4759 A2A_C5 0160 4622 0 2 CAPACITOR FXD 1UF 1 160VDC MET POLYC 28480 0160 4622 A2A C6 0160 6224 3 C 560P 50V 28480 0160 6324 A2A_C7 0160 6606 4 4 CAPACITOR FXD 02UF 200 28480 0160 6606 A2A C8 0160 0578 7 CAPACITOR FXD 047UF 1 50VDC 28480 0160 0578 A2A 0160 0578 7 CAPACITOR FXD 0470 1 50VDC 28480 0160 0578 A2A C10 0160 6606 4 4 CAPACITOR FXD 02UF 200VDC 28480 0160 6606 A2A C11 0160 6606 4 4 CAPACITOR FXD 02UF 200VDC 28480 0160 6506 A2A C12 0150 6606 4 4 CAPACITOR FXD O2UF 200VDC 28480 0160 6606 A2A C13 0180 2651 5 CAPACITOR FXD 1UF 4 109 5OVDC 25088 D1HOGS1ASQK A2A C14 0180 2661 5 CAPACITOR FXD 1UF 4 10 5 TA 25088 D150GS1A50K A2A_J1 1251 6063 1 CONNECTOR 10 POST TYPE 28480 1251 6063 A2A R1 0757 0448 5 2 RESISTOR 18 2K 1 125W 0 100 24546 4 1 8 0 1822 A2A R2 0757 0448 5 RESISTOR 18 2K 1 125W 0 100 24546 C4 1 8 TO 1822 F A2A R3 0698 7235 7 2 RESISTOR 1K 1 05W TC 0 100 24546 C3 1 8 TO 1001 F A2A R4 2100 3351 6 RESISTOR TRMR 500 109 C SIDE ADJ 1 TRN 28480 2100 3351 A2A R5 0698 7243 5 RESISTOR 1 96K 1 05W 0 100 24546 3 1 8 0 1961 A2A R6 0699 7353 9 1 RESISTOR 19K 1 125W TC 0 100 19701 4 1 8 0 1902 A2A R7 0698 7267 4 RESISTOR 19 6K 1 05W TC 0 100 24546 C3 1 8 TO 1962 F A2A 0698 3515 2 RESISTOR 5 9K 1 125W F TC 204 100 24546 C4 1 8 T0 5901 F A2A R9 0757 0200 7 3 RESISTOR 5
215. CAPACITOR V TRMR AIR 2 6 23 5PF 350V 74970 199 0509 125 A8C28 0160 2055 9 CAPACITOR FXD O1UF 80 20 100VDC CER 28480 0160 2055 8 29 0180 0553 0 1 CAPACITOR FXD 22UF 20 25VDC 28480 0180 0553 A8C30 0160 2055 9 CAPACITOR FXD 01UF 80 20 100VDC CER 28480 0160 2055 A8C31 0160 2055 e CAPACITOR FXD 01UF 80 20 100VDC CER 28480 0160 2055 A8C32 0160 2055 9 CAPACITOR FXD 01UF 80 20 100VDC CER 28480 0160 2055 A8C33 0160 2055 9 CAPACITOR FXD 01UF 80 20 100VDC CER 28480 0160 2055 ABC34 0160 2055 9 01UF 80 20 100VDC CER 26480 0160 2055 A8C35 ASSIGNED ABC36 0160 2055 9 O1UF 80 20 100VDC CER 28480 0160 2055 A8C37 0180 1745 4 1 CAPACITOR FXD 1 5UF 10 20VDC TA 56289 1500155X9020A2 A8CR1 1901 0050 3 DIODE SWITCHING 80V 200MA 2NS DO 35 28480 1901 0030 ABCR2 1901 005 3 DIODE SWITCHING 80V 200MA 2NS 32 28480 1901 0050 ABCR3 1901 0050 3 DIODE SWITCHING 80V 200MA 2NS DO 25 28480 1901 0050 ABCR4 1901 0050 3 DIODE SWITCHING 80V 200 2NS 00 35 28480 1901 0050 ABCR5 1901 0050 3 DIODE SWITCHING 80V 200MA 2NS DO 35 28480 1801 0050 1901 0050 3 DIODE SWITCHING 80V 200MA 2NS DO 35 28480 1901 0050 ABCR7 1901 0050 3 DIODE SWITCHING BOV 200 2NS DO 35 28480 1901 0050 A8CR8 1901 0050 3 DIODE SWITCHING 80V 200MA 2NS DO 35 28480 1901 0050 ABCR9 1901 0539 3 1 DIODE SM SIG SCHOTTKY 28480 1901 0539 Refer te Section 7 for update information Factory Selected Component Refer t Section
216. CHEMATIC DIAGRAM NOTES Table 8 6 Schematic Diagram Notes 8 of 11 DIGITAL SYMBOLOGY REFERENCE INFORMATION Miscellaneous dl Schmitt Trigger Input characterized by hysteresis one threshold for positive going signals and a second threshold for negative going signals Active State A binary physical or logical state that corresponds to the true state Active of an input an output or a function The opposite of the inactive state 8 28 Model 8903 Service SCHEMATIC SYMBOLOGY AND SCHEMATIC DIAGRAM NOTES Table 8 6 Schematic Diagram Notes 9 of 11 NAND GATE ED X B OR GATE WITH INVERTED INPUTS X B NOR GATE A X AND GATE WITH INVERTED INPUTS x B BUFFER gt p gt AND GATE OR GATE EXCLUSIVE OR GATE INVERTER OPEN EMITTER OUTPUTS ECL OPEN COLLECTOR OUTPUTS TTL EXTERNAL PULL UP RESISTOR INPUTS EXTERNAL PULL DOWN RESISTOR 8 29 Service Model 8903B SCHEMATIC SYMBOLOGY AND SCHEMATIC DIAGRAM NOTES Table 6 6 Schematic Diagram Notes 10 of 11 ACTIVE LEVELS Active High Input _ N ACTIVE HIGH inputs and outputs are indicated by the ab ACTIVE _ sence of the polarity indicator symbol LEVEL Active High Output ACTIVE LOW inputs and outputs are indicated by the pres ence of the polarity indicator symbol t gt _pACTIVE L LEVEL Activ
217. D A 16 DIP C PKG 04713 IC LCH TTL LS COM CLEAR 8 BIT 01295 IC TTL LS COM CLEAR 8 BIT 01295 IC LCH TTL LS COM CLEAR 8 BIT 01295 IC LCH TTL LS COM CLEAR 8 BIT 01295 IC LCH TTL LS COM CLEAR 8 01295 IC LCH TTL LS COM CLEAR 8 BIT 01295 IC LCH TTL LS COM CLEAR 8 BIT 01295 IC LCH TTL LS COM CLEAR 8 BIT 01295 IC LCH TTL LS COM CLEAR 8 BIT 01295 IC TTL LS COM CLEAR 8 BIT 01295 IC INV TTL LS HEX 1 INP 01295 Factory Selected Component Refer te Section 2 Replaceable Parts Mfr Part Number SN74LS175N SN74LS74AN SN74LS74AN SN74LS74AN SN7403N SN74LSOON LF256H 1826 1018 MC1408L 8 SN74LS259N SN74LS259N SN741 S259N SN74LS259N SN74LS259N SN74 amp LS259N SN74LS259N SN74LS259N SN74LS259N SN74LS259N SN74LS04N A Errata port change 6 67 8903 Replaceable Parts Table 6 3 Replaceable Parts Reference HP Part C at D Mfr escription Mfr Part Number Designation Number D y P Code 08903 60134 1 1 CONTROLLER COUNTER ASSEMBLY 28480 08903 60134 ABC1 0160 2055 9 CAPACITOR FXD 010 80 20 100VDC CER 28480 0160 2055 ABC2 0160 2055 9 CAPACITOR FXD 01UF 80 20 100VDC CER 28480 0160 2055 ABC3 0160 2055 9 CAPACITOR FXD O1UF 80 20 100VDC CER 28480 0160 2055 0760 2055 9 CAPACITOR FXD 010 80 20 100VDC CER 28480 0160 2055 8 5 0160 2055 9 CAPACITOR FXD O1UF 80 20 100VDC CER 28480 0160 2055 A8C6 0160 2055 9 CAPACITOR FXD 010 80 20 100VDC CER 28480 0160 2055 01
218. D on power up initiates the Keyboard signature analysis troubleshooting routine The signature analyzer s start and stop leads are then connected to test point and the probe leads are then connected to test point B See Service Sheet 17 Whenever a test point is grounded the associated annunciator is extinguished rev 20JUN87 8 19 Service Model 8903B SIGNATURE ANALYSIS 8 29 SIGNATURE ANALYSIS Signature analysis is a simple method of verifying the operation of digital circuitry When properly used signature analysis can detect extremely subtle hardware faults Signatures must identically match those given in the signature tables If everything is working correctly signatures will all match exactly If they don t match by even one digit something is wrong Keyboard and Display Latch and Counter Controller Assemblies 1 A7 and 8 are designed for troubleshooting with signature analysis Signature analysis 1 a method of digital signal tracing using test routines programmed in the Audio Analyzer s ROM With the Audio Analyzer s Controller executing the signature analysis routine the signature analysis routine the signature analyzer s test probe is used to check nodes in the circuit under test signature analyzer converts the signals at the node into a four digit signature which it displays This signature is then compared to the signature in the troubleshooting checks adjacent to the appropriate schematic These tw
219. DC 56289 1500685 903582 6 0180 0116 1 CAPACITOR FXD 6 8UF 10 35VDC 56289 1500685 9035 2 6 9 0180 0116 1 CAPACITOR FXD 6 80 10 35VDC TA 56289 1500685 903582 6 10 NOT ASSIGNED A6C11 0160 4791 4 CAPACITOR FXD tOPF 5 100VDC CER 04 30 28480 0160 4791 A8C13 0180 2207 5 CAPACITOR FXD 100UF 10 10VDC 56289 150D107X9010R2 6 14 0160 4787 8 CAPACITOR FXD 22PF 5 100VDC CER 0 30 28480 0160 4787 6 15 0160 4800 6 2 CAPACITOR FXD 120PF 5 100VDC CER 28480 0160 4800 6 16 19 NOT ASSIGNED 6 20 0160 4800 6 CAPACITOR FXD 120PF 5 100VDC CER 28480 0160 4800 A8C21 0180 0116 1 CAPACITOR FXD 6 8UF 10 35VDC 56289 150D685X9035B2 6 22 0180 0116 1 CAPACITOR FXD 6 8UF 10 35VDC 56289 150D685X903582 6 23 0180 0116 1 CAPACITOR FXD 6 8UF 10 35VDC 56289 1500685X9035B2 6 24 0180 0116 1 CAPACITOR FXD 6 8UF 10 35VDC 56289 1500685x9035B2 6 25 0121 0493 3 1 TRMR AIR 1 7 11 175V 74970 187 0306 125 6 26 0160 4789 0 2 CAPACITOR FXD 15PF 5 100VDC CER 0 30 28480 0160 4789 A6C27 NOT ASSIGNED A6C28 0180 0374 3 CAPACITOR FXD 10UF 10 20VDC TA 56289 150D 106X9020R2 6 29 NOT ASSIGNED A6C30 0160 4832 4 CAPACITOR FXD 01UF 10 100VDC CER 28480 0160 4832 A6C31 0160 4832 4 CAPACITOR FXD 01UF 10 100VDC CER 28480 0160 4832 A6C32 0180 1794 3 4 CAPACITOR FXD 22UF 10 35VDC TA 56289 150D225x9025R2 A6C33 0160 4832 4 CAPACITOR FXD 010 10 100VDC CER 28480
220. EL CHAM 10 32 1410 094 1N THK 00000 ORDER BY DESCRIPTION THREADED INSEHI STOF M3X0 5 14 MM LG 28480 0590 1580 NO LONGER AVAILABLE SEE SECTION 7 FRONT FRAME MODIFIED 28480 06903 20296 CORNER STRUT 25480 502 8836 SCREW MACH 8 32 25 IN LG 100 DEG 00000 ORDER BY DESCRIPTION ATTACHES CORNER STRUT TO FRONT AND REAR FRAME REAR PANEL ASSEMBLY 28480 08 03 50168 SCREW MACH 6 32 312 IN LG PAN HD POZI 00000 ORDER BY DESCRIPTION ATTACH MOTHERBOARD TO REAR PANEL ASSY CORNER STRUT 28480 5021 5835 SCREW METRIC SPECIALTY M4 X 0 7 THD 6 28480 0515 1331 ATTACHES CORNER STRUT TO FRONT AND REAR FRAME REAR PANEL ASSEMBLY 28480 08803 60165 SCREW MACH M3 X 0 5 EMM LG PNTX 06930 ORDER BY 5 ATTACH MOTHERBOARD TO REAR PANEL ASSY Pactory Selected Refer ta Section 5 A Birate part change 6 101 TTT Refer to Section 7 for update information 6 102 ATTACH STANDOFF TO REAR PANEL ASSEMBLY Factory Selected Component Refer to Section 5 Replaceable Parts Model 8903B Table 6 3 Replaceable Parts Reference HP Part C Mfr Designation Number D Qty Description Code Mfr Part Number 2450A TO 2908A MP4 NO LONGER AVAILABLE SEE SECTION 7 5 NO LONGER AVAILABLE SEE SECTION 7 6 NO LONGER AVAILABLE SEE SECTION 7 2910A AND ABOVE 4 08903 00148 1 1 28480 08903 00148 MP5 5062 3892 1 1 COVER BOTTOM 28480 5062 3092 MP6 5041 8802 9 1 TRIM STRIP TOP 28480 5041 88
221. ER XA4 CONTROLLER to y ak D D es Figure 8B Service Model 8903B Table 8 3 Key Scan Programs 0 10 FIXED 0 rem 728 7 20 REMOTE 728 wrt 728 60 SP 30 LOCAL LOCKOUT 7 red 728 A 40 OUTPUT 728 60 SP dsp A jmp 1 50 ENTER 728 A end 60 DISP A 70 GOTO 50 80 END 61 N Display HP IB Status Displays the status of the HP IB lines selected by display is in binary See Service N 0 1 2 N 3 Sheet 19 for troubleshooting and a complete list of HP IB mnemonics NOTE Binary representations of the information pointed brackets appear the Audio Analyzer s displays Displays lt 0 gt in the left display and lt Addressed to Talk gt lt Addressed to Listen gt in the right display This function reads back and displays the present state of the Talk and Listen Address Flip Flops A9U1A and U1B For example if the displays show 1 and 0 the Audio Analyzer is addressed to talk and is unaddressed to listen This means the Talk Address Flip Flop is set and the Listen Address Flip Flop is reset Displays lt 0 gt in the left display and lt DAV gt lt RFD gt lt DAC gt in the right display This function reads back and displays the present state of the three bus handshake lines lt DAV gt reflects the state of the Data Valid bus handshake line as being driven by the Audio Analyzer 1 being driven 0 no
222. FXD CAPACITOR FXD CAPACITOR FXD CAPACITOR FXD CAPACITOR FXD CAPACITOR FXD CAPACITOR FXD 6 8UF 10 35VDC TA 1096 10VDC 01UF 10 100VDC CER 01UF 10 100VDC CER 6 8UF 1096 35VDC TA 01UF 10 100VDC CER 01UF 10 100VDC CER 01UF 10 100VDC CER 010 10 100VDC CER 01UF 10 100VDC CER 01UF 10 100VDC CER O1UF 10 100VDC CER 01UF 10 100VDC CER 010 10 100VDC CER TUF 10 100VDC CER 01UF 10 100VDC CER 01UF 10 100VDC CER 01UF 10 100VDC CER A7UF 1096 35VDC TA A7UF 10 35VDC TA 1000PF 4 596 100VDC CER 1000PF 5 100VDC CER CAPACITOR FXD 47UF 4 1096 20VDC TA CAPACITOR FXD 47UF 10 20VDC TA CAPACITOR FXD 47UF 10 35VDC TA CAPACITOR FXD 47UF 1096 35VDC CAPACITOR FXD 47UF 1096 35VDC TA CAPACITOR FXD 6 8UF 1096 35VDC CAPACITOR FXD 6 8UF 10 35VDC TA CAPACITOR FXD 15PF 5 100VDC CER 0 30 CAPACITOR FXD 47UF 1096 35VDC TA CAPACITOR FXD 47UF 10 35VDC TA DIODE SWITCHING 30V 50MA 2NS DO 35 DIODE SWITCHING 30V 50MA 2NS DO 35 DIODE SWITCHING 80V 200MA 2NS DO 35 DIODE SWITCHING 80V 200MA 2NS DO 35 DIODE SWITCHING 80V 200 2NS 00 35 DIODE SWITCHING 80V 200MA 2NS DO 35 DIODE DUAL 70V VF DIFF 10MV DIODE DUAL 50V 200 VF DIFF DIODE SWITCHING 80V 200MA 2NS DO 35 DIODE SWITCHING 80V 200MA 2NS 00 35 DIODE SWITCHING 80V 200MA 2NS DO 35 DIODE SWITCHING 80V 200MA 2NS DO 35 Mfr Code 28480
223. FXD 10PF 4 595 100VDC CER 0 30 28480 CAPACITOR FXD 100PF 5 100VDC CER 28480 CAPACITOR FXD 100PF 5 100VDC CER 28480 C MPE 1 5U 600V 28480 CAPACITOR FXD 20PF 4 599 500VDC CER 0 30 28480 CAFACITOR V TRMR PSTN 8 4 5PF 1250V 18736 27PF 5 100VDC CER 0 30 28480 CAPACITOR V TRMR PSTN 8 4 5PF 1250V 18736 CAPACITOR FXD 068UF 5 100VDC 28480 CAPACITOR FXD 01UF 10 100VDC CER 28480 CAPACITOR FXD OTUF 10 100VDC CER 28480 CAPACITOR FXD O1UF 10 100VDC CER 28480 CAPACITOR FXD 1UF 10 SOVDC CER 28480 CAPACITOR FXD 1UF 10 SOVDC CER 28480 CAPACITOR FXD 1 2PF 25 500VDC CER 28480 CAPACITOR FXD 27 5 100VDC CER 04 30 28480 CAPACITOR FXD 1PF 4 25PF 500VDC CER 28480 CAPACITOR FXD 100PF 4 595 100VDC CER 28480 CAPACITOR FXD OTUF 10 100VDC CER 28480 CAPACITOR FXD 10PF 5 100VDC CER 0 30 28480 CAPACITOR FXD 100PF 4 59 100VDC CER 28480 CAPACITOR FXD 10PF 5 5 100VDC CER 0 30 28480 CAPACH OR FXD 100PF 4 595 100VDC CER 28480 CAPACITOR V TRIMMER POLYCARBONATE FILM 28480 CAPACITOR V TRIMMER POLYCARBONATE FILM 28480 Factory Selected Component Refer to Section 5 Model 8903B Mfr Part Number 1500475 9035 2 0160 4835 0160 4835 0160 4834 0160 4819 0160 4791 0160 4835 0160 4835 0160 4791 0160 4632 0160 4791 0160 4791 0160 4801 0160 4801 0160 6370 0160 2264 TPSG 0160 4766 5 0160 5549 0160 4832 0160 4832 0160 4832 0160 4835 0160 4835
224. GNED DIODE ZNR 5 76V 2 DO 35 PD 4W DIODE ZNR 16 2V 2 DO 35 PD 4W DIODE ZNR 5 11V 2 DO 35 PD 4W CONNECTOR PC EDGE 15 CONT ROW 2 ROWS CONNECTOR PC EDGE 22 CONT ROW 3 ROWS CONNECTOR PC EDGE 15 CONT ROW 2 ROWS CONNECTOR PC EDGE 15 CONT ROW 2 ROWS CONNECTOR PC EDGE 15 CONT ROW 2 ROWS CONNECTOR PC EDGE 15 CONT ROW 2 ROWS CONNECTOR PC EDGE 15 CONT ROW 2 ROWS CONNECTOR PC EDGE 22 CONT ROW 3 ROWS CONNECTOR PC EDGE 15 CONT ROW 2 ROWS CONNECTOR PC EDGE 22 CONT ROW 3 ROWS CONNECTOR PC EDGE 22 CONT ROW 3 ROWS CONNECTOR PC EDGE 22 CONT ROW 3 ROWS CONNECTOR PC EDGE 22 CONT ROW 3 ROWS CONNECTOR PC EDGE 22 CONT ROW 3 ROWS CONNECTOR PC EDGE 22 CONT ROW 3 ROWS CONNECTOR PC EDGE 22 CONT ROW 3 ROWS CONNECTOR PC EDGE 22 CONT ROW 3 ROWS CONNECTOR PC EDGE 12 CONT ROW 2 ROWS CONNECTOR PC EDGE 6 CONT ROW 2 ROWS CONNECTOR PC EDGE 6 CONT ROW 2 ROWS CONNECTOR PC EDGE 6 CONT ROW 2 ROWS Mfr Code 28480 28480 28480 28480 28480 01295 28480 09000 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 Factory Selected Component Refer to Section 5 Model 8903B Mfr Part Number 1251 0600 1251 0600 1251 0600 1251 0600 1251 0600 TLO72ACJG 2190 0006 ORDER BY DESCRIPTION 1902 3381 1902 3381 1902 0960 1902 0943 1902 0960 1902 3214 1902
225. HIGH OUTPUT to the HIGH INPUT 2 Connect a voltmeter to A4TP4 4 Set the voltmeter to measure ac Fine adjust the Audio Analyzer s SOURCE amplitude for 2 99 to 3 01 Vrms on the voltmeter Hint The amplitude at A4TP4 before adjustment should be between 2 85 and 3 15 Vrms If the signal is faulty see Service Sheet 5 and check the Output Amplifier circuitry 3 Connect the voltmeter to A4TP1 DC OUT Set the voltmeter to measure dc The level on the voltmeter should be between 4 2 94 and 3 06 Vdc Grounding pin 2 of U22 should have no effect Hint Pin 10 of 023 should be a TTL low U23B U23D U24B and U24D should be on U23A U23C U24 lt A and U24C should be off s po LL ll F SE K a 9 Sec Figure 8B 33 1 Waveform at A4TP1 v1 Step 12 rev 20J UN87 8B 45 Service Model 8903B Hint If the signal amplitude is only slightly out of limits perform the Voltmeter Adjustment paragraph 5 13 if greatly out of limits perform the 72 Full Wave Rectfier Check and the 73 Log Amplifier and Filter Amplifier Check 4 Key in 5 2 SPCL to switch the detector to average The level on the voltmeter should be between 2 94 and 3 06 Vdc Grounding pin 2 of U22 should cause the level to go to approximately 15 Vdc
226. HOLLYWOOD CA 91601 Tel 818 505 5600 OTHER INTERNATIONAL AREAS Hewlett Packard Co Intercontinental Headquarters 3495 Deer Creek Road PALO ALTO CA 94304 Tel 415 857 1501 Telex 034 8300 Cable HEWPACK SAFETY CONSIDERATIONS GENERAL This product and related documentation must be reviewed for familiarization with safety markings and instructions before operation This product is a Safety Class I instrument provided with a protective earth terminal BEFORE APPLYING POWER Verify that the product is set to match the available line voltage and the correct fuse is installed SAFETY EARTH GROUND An uninterruptible safety earth ground must be pro vided from the main power source to the product input wiring terminals power cord or supplied power cord set SAFETY SYMBOLS Instruction manual symbol the product will be marked with this symbol when it is necessary for the user to refer to the instruction manual refer to Table of Contents 2 Indicates hazardous voltages Indicates earth ground terminal The WARNING sign denotes a hazard It calls attention to a procedure practice or the like which if not correctly performed or adhered to could result in personal injury Do not proceed beyond a WARNING sign until the indicated conditions are fully understood and met CAUTION CAUTION sign denotes a hazard It calls attention to an operating procedure practice or the like which i
227. ISSISSAUGA Ontario L4V 1 8 Tel 416 678 9430 Telex 069 8644 EASTERN EUROPE Hewlett Packard Ges m b h Liebigasse 1 P O Box 72 A 1222 VIENNA Austria Tel 222 2500 0 Telex 1 3 4425 HEPA A NORTHERN EUROPE Hewlett Packard S A V D Hooplaan 241 P O Box 999 NL 118 LN 15 AMSTELVEEN The Netherlands Tel 20 5479999 Telex 18919 hpser SOUTH EAST EUROPE Hewlett Packard S A World Trade Center 110 Avenue Louis Casai 1215 Cointrin GENEVA Switzerland Tel 022 98 96 51 Telex 27225 hpner Mail Address P O Box CH 1217 Meyrin 1 GENEVA Switzerland MIDDLE EAST AND CENTRAL AFRICA Hewlett Packard S A Middle East Central Africa Sales H Q 7 rue du Bois du Lan P O Box 364 CH 1217 Meyrin 1 GENEVA Switzerland Tel 022 83 12 12 Telex 27835 hmea ch Telefax 022 83 15 35 UNITED KINGDOM Hewlett Packard Ltd Nine Mile Ride WOKINGHAM Berkshire RG113LL Tel 0344 773100 Telex 848805 848814 848912 UNITED STATES OF AMERICA Customer Information Center Tel 800 752 0900 6 00 AM to 5 00 PM Pacific Time EASTERN USA Hewlett Packard Co 4 Choke Cherry Road ROCKVILLE MD 20850 Tel 301 948 6370 MIDWESTERN USA Hewlett Packard Co 5201 Tollview Drive ROLLING MEADOWS IL 60008 Tel 312 255 9800 SOUTHERN USA Hewlett Packard Co 2000 South Park Place ATLANTA GA 30339 Tel 404 955 1500 WESTERN USA Hewlett Packard Co 5161 Lankershim Blvd NORTH
228. ISTOR 162K 1 125W 0 100 24546 RESISTOR 5 62K 1 125W F TC 0 100 24546 ASSIGNED RESISTOR 90 9K 1 125W 0 100 24546 Selected Component Refer te Section S 4 1 8 0 3162 4 1 8 0 1001 C4 1 8 TO 511 1 F 4 1 8 0 1002 4 1 8 0 3481 0698 6360 0698 8822 C4 1 8 TO 1003 F 4 1 8 0 5111 4 1 8 0 2371 4 1 8 0 3831 4 1 8 0 301 4 1 8 0 3161 0698 6630 0698 6360 4 1 0 1471 C4 1 8 T0 1782 F 4 1 8 0 1471 0698 8822 0698 8822 4 1 8 0 2151 C4 1 8 T0 7501 F C4 1 8 TO 1002 F 4 1 8 0 1002 4 1 8 5111 C4 1 8 0 1962 4 1 8 0 1001 43 5 4 1 9 0 1241 0698 3459 4 1 6 0 1001 4 1 8 70 5111 0699 0526 43 502 0698 8799 43P202 4 1 8 70 2373 0698 6530 C4 1 8 TO 2373 F C4 1 B TO 5111 F 0593 6630 41 8 0 1001 C4 1 8 TO 1002 F 4 1 8 1783 4 1 8 0 1623 1 8 0 5621 4 1 8 0 9092 A Errata part echange 6 47 Replaceable Parts Model 8903B Table 6 3 Replaceable Parts Reference HP Part Mfr Designation Number D Qty Description Code Part Number A4 08903 60283 SERIAL PREFIX 2816 AND ABOVE HP8903B A4R108 0698 3456 5 1 RESISTOR 287K 1 125W 0 100 24546 4 1 8 0 2873 A4R109 0698 3453 2 RESISTOR 196K 1 125W TC 0 100 24546 C4 1 8 TO 1963 F A4R110 0698 5631 4 RESISTOR
229. K HEAT SINK LINE POWER CONNECTOR LABEL PANEL A12J4 PANEL COVER MODULE A12J2 MP36 TRANSFORMER RED LABEL ASSY SIDE OF UNDER REAR PANEL REAR PANEL Figure 6 4 Chassis and Mechanical Parts Identification Rear Panel 2742A and above 6 76 rev 15FEB89 8903 Reference Designation A8 A8 8 1 ABC2 A amp C3 8 4 8 5 A8C6 ABC7 A8C8 ABC10 8 11 A8C12 ABC13 ABC14 ABC15 ABC16 8 17 ABC18 ABC19 ABC20 8 21 8 22 27 8 28 8 29 8 0 1 ABC32 A8C33 ABC34 A8C35 A8C36 ABC37 8 38 A8C39 8 40 8 41 1 8 2 ABCR3 A8CR4 A8CR5 A8CR6 A8CR7 A8CR8 HP Part Number 08903 60300 0160 4832 0160 4832 0160 4832 0160 4832 0160 4832 0160 4832 0160 4832 0160 4832 0160 4832 0160 4832 0160 4832 0160 4832 0160 4832 0160 4832 0160 4832 0160 4832 0160 4832 0160 4832 0160 4832 0160 4832 0160 4832 0160 4832 0160 4822 0160 4822 0180 1974 0160 4835 0160 4783 0160 4765 0180 2111 0180 0197 0180 0197 0180 0197 0180 0197 0180 2111 0180 2111 0180 2111 0121 0436 1901 1098 1901 1098 1901 1098 1901 1098 1901 1098 1901 1098 1901 1098 1901 1098 C D 3 O N AN NN p b b gt h 5 gt b j gt bh Qty 1 22 Refer to Section 7 for update information reu 20JUN91 Table 6 3 Repla
230. L PANEL REAR OPTION 001 ONLY 28480 SCREW MACH M3 X 0 5 8MM LG PNTX 00000 ATTACHES PANEL TO HEATSINK PANEL SCREW MACH ASSY M3 X 0 5 10 00000 SCREW MACH ASSY M3 X 0 5 10MM LG 00000 LABEL PANEL REAR EXCEPT OPTION 001 28480 SCREW MACH M3 X 0 5 8MM LG PNTX 00000 ATTACHES PANEL HEATSINK PANEL SCREW MACH ASSY M2 X 0 4 4AMM LG 00000 ASSY X 05 10MM LG 00000 NAMEPLATE 9 23 MM WD 13 7 MM LG CU 03211 NOT ASSIGNED LABEL WARNING HAZARDOUS VOLTAGE 28480 ALWAYS PRESENT IN THIS AREA LABEL CAUTION METRIC THREADED 28480 ASSIGNED NOT ASSIGNED LABEL CAUTION REMOVE FOUR FEET 28480 ASSIGNED NOT ASSIGNED NUT SPCLY 15 32 32 THD t IN THK 562 WD 00000 WASHER LK INTL T 1 2 IN 505 IN ID 28480 WASHER LK INTL T 15 32 IN 472 IN ID 28480 NUT HEX DBL CHAM 15 32 32 THD 00000 3 PIN CIRC AUDIO 28480 4 Selectol n efer to Serti 2 Replaceable Parts Mfr Part Number 08903 4000 08903 90047 08903 60201 ORDER BY DESCRIPTION 2190 0584 1400 1016 8 ORDER DESCRIPTION 2190 0584 08903 00103 ORDER BY DESCRIPTION 08903 20054 ORDER BY DESCRIP ORDER DESCRIPTION 08903 00010 ORDER BY DESCRIPTION 0515 0373 0515 0365 08903 60017 08903 90042 ORDER BY DESCRIPTION ORDER BY DESCRIPTION ORDER BY DESCRIPTION 08993 0010 ORDER BY DESCRIF TION ORDER BY DESCRIPTICN ORDER BY 7
231. LOW BIAS H IMFD TO 99 PKG 27014 IC OP AMP LOW BIAS H IMPD DUAL 8 DIP C 01295 IC OP AMP LOW BIAS H IMPD TO 99 PKG 28480 IC LOW NOISE DUAL 8 PKG 18324 IC OP AMP LOW BIAS H IMPD TO 99 PKG 27014 28480 IC OP AMP 28480 Factory Selected Component Refer te Section 5 Model 8903B Mfr Part Number C4 1 8 T0 3161 F C4 1 8 TO 38R3 F C4 1 8 TO 38R3 F 4 1 8 0 1001 4 1 8 0 2371 4 1 8 0 5622 4 1 8 0 1003 C3 1 8 TO 1212 F 4 1 8 0 1001 4 1 8 0 7501 C3 1 8 TO 1621 F 55 1 8 0 2185 4 1 8 0 1001 4 1 8 0 2151 4 1 8 0 2151 PMESS 1 8 T0 21R5 F 4 1 8 10 3831 4 1 8 0 3831 4 1 8 0 1002 C4 1 8 TO 1002 F PMESS 1 8 TO 21R5 F PMESS5 1 8 TO 21R5 F 1251 0600 1251 0600 1251 0600 1251 0600 1251 0600 1251 0600 1251 0600 1251 0600 1251 0600 1251 0600 1251 0600 SN74LSO2N LM31 tL 1826 0652 XR5534ACN 08903 80041 SN74LS123N LM339N LF256H TLO72ACJG 1826 0662 5532 LF256H 1826 1492 1826 1492 A Errat part echange rev 6FEB90 Model 8903 Reference Designation A5U16 5017 5018 5019 5020 ASVR1 ASVR2 ASVR3 ASVRA ASVRS 5 tRefer to Section 7 for upstate information rev 1GFEB90 HP Part Number 1826 0138 1826 0138 1826 0138 1826 0582 1826 0138 1902 0951 1902 0951 1902 0943 1902 0954 1802 0680 1902 0955 o m
232. Lis D2 2 Measured with respect to the 15 VDC supply 3 THE A4 OUTPUT AMPLIFIER VOLTMETER ASSEMBLY 08903 60128 may retrofit to analyzers with serial prefixes 2306A or lower having A3 NOTCH FILTER ASSEMBLY 08903 60105 To retrofit carefully unsold er A4R101 and resolder this resister between points and B as shown on this schematic 557 Unsolder A4R200 and resolder this resistor between points C and D on 557 Solder pads and mounting holes are prOVIDED on the circuit board 4 if the A4 OUTPUT AMPLIFIER VOLTMETER ASSEMBLY 08903 60128 is to be AVG VG SCALE SCALE TP3 TP41 4 5 8 TP6 CALIBRATION TPG TP40 CALIBRATION used in an 8903A AUDIO ANALYZER as an RMS detector pin 1 of the 2 2 P P 2 XA4A connector must be grounded Otherwise the A4 assembly will function as an AVG detector Nof BLACK Qr Mond O E EEG a142 408 9 ace pA t 6 CR23 CAc4 C34 C25 R22 824 918 A125 al sak lla c T W Ojja x wf dc Pont dn t pet 0 c a ac i qe 811 A e 5 m me gt i BERE m i sade gt ser Bae gt T d EI Ue cc criar fo hole r a a a jjo gt o I Cr B c d c O B m D e
233. MATION Component Locator TP7 15 TP ia TP10 8 35 Y 38918 920 n U17 U14 u 254 TP11 12 IP43 e n3 A n CR 925 826 027 R30 928 R31 m ta CAD 011 5 116 E G TP14 2 ORANGE Q 930 31 TE ta C12 34 2 035 Jes ce EE 0000000000608 wv TIT r PY AY 8 25 SEE REVERSE SID COMP X Y Component Coordinates B2 Notch Filter Notch Generating Circuits COMP X Y 953 Service NOTES 8B 112 2 TOP VIEW Ie GND PLASTIC CASE OR Schematic General 10 18 METAL Information Modal 8903B Model 8903 Service CHANGES 2717A to 2742A On the A13 schematic e 08903 60192 Change the part number of the A13 POWER SUPPLY AND MOTHERBOARD ASSEMBLY to 08903 60192 On the A13 schematic 2813A and above e 08903 60292 Change the part number of the A13 POWER SUPPLY AND MOTHERBOARD ASSEMBLY to 08903 60292 SS4 rev 14FEB89 8 112 1 P O A13 POWER SUPPLY P NOTCH FILTER ASSEMBLY 08903 60163 vi _ AND MOTHERBOARD DX gi Es H M G a uama
234. N A8U24 NOT ASSIGNED A8U25 NOT ASSIGNED ABU26 NOT ASSIGNED ABU 7 NOT ASSIGNED A8U28 NOT ASSIGNED 8029 1820 111 8 IC FF TTL LS D TYPE POS EDGE TRIG 01295 SN74L 37 4AN 8030 1818 mie 2 1 NMOS 1024 1 STAT PAM 400 5 3 5 34335 AM 1L11hRDC 12000 0535 7 1 18 LIP DIP SLOR 28380 1200 0839 2 50A TO 2818A 4485231 1952036 4 1 ROM PROG 10 89038 ONLY 28480 08903 80036 2 2 1721 5 1 SOCKET IC DIP PC 28480 1200 1121 PRIGN 20724 AQUI 08903 8007 2 1 10 8903B ONLY 28480 08903 80050 1200 1121 5 1 SOCKET C DIP FC 28480 1200 1121 ABU34 1820 1281 2 1 TTL LS 2 TO 4 LINE DUAL 2 INP 01295 SN7ALS 1301 ABY1 0410 0757 5 1 CRYSTAL QUARTZ 2 000 2 I4C G U HLOR 28480 0410 0757 ABY1 0410 0757 5 1 CRYSTAL QUARTZ 2 000 MHZ HC 6 U HLOR 28480 0410 0757 Mefer te ection n update pee Partory Ciognpirmient bs See tbe sth phat change rev 1GFEB90 6 75 Replaceable Parts Model 8903B A1MP34 A1MP30 A1MP6 1 29 A1MP14 1 2 A1MP12 A1MP16 A1 Quee X A1 1 A1MP10 A1MP40 A1MP24 A1MP28 A1MP26 1 18 J1 A1DS20 A1MP36 A1MP31 7 AMPA 1 25 A1MP32 15 A1MP37 A1MP27 1 11 A1MP39 A1MP23 1 A1MP35 1 8 22 MP23 LABEL HOLDER AND LABEL Except Option 001 Figure 6 3 Chassis and Mechanical Parts Identification Front Panel A10J1 MP28 MP29 A14 HP IB MP31 HEAT SIN
235. N74LS197N 5 74 5197 SN74LSO8N SN74LSOON 1820 1928 1200 0654 1820 2027 1200 0354 53741 264 1200 0538 A Errat part change rev 16 EB90 rev 1GFI B90 Model 8903B Replaceable Parts Table 6 3 Replaceable Parts Reference HP Part C Mfr Designation Number D Description Code Mfr Part Number A8 08903 60134 SERIAL PREFIX 2450A TO 2614A 2450A TO 2520 4 ABUG 08903 80017 1 1 ROM PROG 2 28480 08903 80017 1200 0541 1 SOCKET IC 24 CONT DIP DIP SLOR 28480 1200 0541 809 08903 80016 0 1 ROM PROG 1 28480 09903 80016 1200 0541 1 SOCKET IC 24 CONT DIP SLOR 28480 1200 0543 8 10 08903 80018 2 1 ROM PROG 3 28480 08903 80018 1200 0541 1 SOCKET IC 24 CONT DIP SLDR 28480 1200 0541 AG8UT1 08903 80019 3 1 ROM PROG 4 28480 08903 80019 1200 0541 1 SOCKET IC 24 CONT DIP DIP SLDR 28480 1200 0541 8012 00903 80022 8 1 ROM PROG 7 28480 08903 80022 1200 0541 1 SOCKET IC 24 CONT DIP DIP SLOR 28480 1200 0541 48 13 08903 80021 7 1 ROM PROG 6 28480 08903 80021 1200 0541 1 SOCKET IC 24 CONT DIP SLOR 28480 1200 0541 2537A TO 26 11 ABUS 1818 3742 9 1 ROM PROG 2 28480 1818 3742 1200 0541 1 SOCKET IC 24 DIP DIP SLOR 28480 1200 0541 9 1818 3741 8 1 ROM PROG 1 28480 1818 3741 1200 0541 t SOCKET IC 24 DIP DIP SLDR 28480 1200 0541 A81710 1816 3743 0 1 ROM PROG 3 28480 1818 3743 1200 0541 1 SOCKET IC 24 CONT DIP DIP SLDR 28430 1200 0541 801 1818 3744 1 1 ROM FROG 4 28380 1818 3744 1200 0541 1
236. OPTION 010 050 08903 60124 2 AMPLIFIER mn ASSEMBL Y STAGE 1 dv kE a r P STAGE emo P O XA2A1 08903 60170 OR 2 2 5 lt 4 P Q xaaa 1 lt c L 15V F L 3 W 5 p P O TE INPUT 2 1 OR A2A2 C C I T T WEIGHTING FILTER ASSEMBLY OPTION 011 OR 051 08903 60125 P O A ASSEMBLY 08903 60170 STAGE 2 STAGE 3 4 Nn STAGE 5 7 STAGE 6 P O STAGE i C2 0 0104 A n vp pues U1A 3 ey ue 15V 0 0474 5 ga FBK 9 4 1000 1060p gt S 19 Gk in RB R4 5 v A 900 foy c3 gt at 1500 0 0471 A5 19k H11 C7 1470 0 02 4000p BAIN 8 NC 1980 15 9 3 an ee 1043 21 5 GN i 15 TO 15 mv DC 4 45V IF ATTENTION t Static Sensitive 27 NC Devices L PREFIX ae RIT una eel iC q Q ae ram eee a 552 Figure 88 107 88 107 Model 8903 NOTES 1 When an optional plug in filter assembly is in the left most position filter 1 it is designated as assembly A2A1 When an optional plug in filter assembly is in the right most position filter 2 it
237. OR 1K 1 125W 0 100 RESISTOR 10K 1 125W TC 0 25 RESISTOR 20K 1 125W F 0 25 RESISTOR 10K 1 125W F 0 25 RESISTOR 10K 1 125W 0 25 RESISTOR 2 21 1 125W 0 25 RESISTOR 20K 1 125W 0 25 CONNECTOR SGL CONT PIN 1 14 MM BSC S2 SQ CONNECTOR SGL CONT 1 14 MM BSC SZ SO CONNECTOR SGL CONT PIN 1 14 MM BSC S2 SQ CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ CONNECTOR SGL CONT PIN 1 14 8 52 SQ CONNECTOR SGL CONT FIN 1 14 52 SQ CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ CONNECTOR SGL CONT 1 14 MM BSC SZ SQ CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SO CONNECTOR SGL CONT PIN 1 14 5 52 SQ CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SO CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SO CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ IC OP AMP GP DIP PKG IC OP AMP LOW DRIFT TO 99 PKG LOW DRIFT TO 99 PKG IC MULTIPLIER 14 DIP C PKG LOW NOISE 6 DIP C Mfr Code 24546 24546 24546 24546 24546 24546 24546 24546 24546 28480 28480 24546 24546 28480 28480 28480 28480 28480 19701 24546 24546 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 01295 27014 27014 04713 52063 Selected C onpounent Refer te S
238. OR FXD 2 2UF 10 20VDC CAPACITOR FXD 1UF 4 20 CER CAPATITOR FXD 47 5 300VDC MICA CAPACITOR 47PF 5 e 300VDC MICA CAPACITOR FXD 47PF 5 300VDC MICA CAPACITOR FXD 47PF 4 59 200VDC MICA CAPACITOR FXD 47PF 5 100VDC CER 04 30 CAPACITOR FXD 1UF 10 SOVDC CER CAPACITOR FXD 10 SOVDC CER CAPACITOR FXO 1Uf 4 109 50 0 CER CAPACITOR FXD 1UF 10 SOVDC CAPACITOR FXD 1UF 10 SOVDC CAPACITOR FXD 1UF 10 SOVDC DIODE PWR RECT 100V 1 5A DIODE PWR RECT 100V 1 5A DIODE PWR 100V 1 5A DIODE PWR RECT 100V 1 5A DIODE CT RECT 200V 15 INSULATOR XSTR ALUMINUM HEAT SINK TO 3 CS WASHER LK HLCL NO 6 141 IN ID SCREW MACH 6 32 562 IN LG PAN HD POZ NUT HEX DBL CHAM 6 32 THD 109 IN THK WASHER FL MTLC NO 6 149 IN ID Mfr Code 08903 60129 192 292 SERIAL PREFIX 2450A TO 2922A 28480 28480 28480 00853 00000 00853 00900 78480 00000 00853 00000 00000 00853 00000 00000 28480 00000 00000 56289 56280 55289 72136 56289 56289 56289 56289 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 00000 28380 28480 Factory Selected C oimpouent Refer to Sectiou Replaceable Parts Mfr Part Number 68903 50129 08903 60192 08293 60292 539 7445 02 ORDER DESCRIPTION 539 7445 02 ORDER BY DESCRIPTION 0180 0452 ORDER DESCIPTION
239. OR NPN 2N2219A SI TO 5 PDz800MW 01295 2N2219A INSULATOR XSTR POLYI 28480 0340 0834 HEAT SINK SGL TO 5 TO 39 CS 30161 3225B TRANSISTOR JFET DUAL N CHAN D MODE SI 28480 1855 0418 RESISTOR 21 5 1 125W F TC 0 100 03888 PME55 1 8 TO 21R5 F RESISTOR 21 5 1 125W TC zO 100 03888 PME55 1 8 T0 21R5 F NOT ASSIGNED RESISTOR 6 81 1 125W F TC 0 100 28480 0698 8822 RESISTOR 6 81 1 125W 1 0 100 28480 0698 8822 NOT ASSIGNED RESISTOR 1 1 125W 0 100 28480 0698 8812 NOT ASSIGNED RESISTOR 100 1 125W F 0 100 24546 C4 1 8 TO 101 F NOT ASSIGNED RESISTOR 1 1 125W TC 0 100 28480 0698 8812 RESISTOR 100 1 125W TC 0 100 24546 4 1 8 0 101 RESISTOR 1 111K 1 125W 0 25 19701 MF4C1 8 T9 1111R 8 RESISTOR 1 1 125W TC 0 100 28480 0698 8812 RESISTOR 1 125W TCz0 4 25 28480 0698 6343 RESISTOR 9K 1 125W F 0 25 28480 0698 5343 RESISTOR 1K 1 125 0 25 28480 0698 6362 RESISTOR 19 6K 1 125W F 0 100 24546 4 1 8 1962 RESISTOR 19 6K 1 125W TC 0 100 24545 4 1 8 10 1962 RESISTOR 100 1 125W 0 100 24546 4 1 8 70 101 RESISTOR 1K 1 125W 0 25 28480 0698 5362 RESISTOR 1 111K 1 125W 0 25 19701 MFAC1 8 T9 1111R B RESISTOR TRMR 20K 10 C SIDE ADJ 1 28480 2100 3353 RESISTOR 681K 1 125 0 100 28480 0698 8825 NOT ASSIGNED RESISTOR 2K 1 125W TC 0 25 28480 0698 6524 RESISTOR 2 652K 1 12W 28480 0699 1728 RE
240. OT ASSIGNED CONNECTOR RF BNC FEM SGL HOLE RR 50 OHM CONNECTOR RF BNC FEM SGL HOLE RR 50 OHM CONNECTOR RF BNC FEM SGL HOLE RR 50 OHM INDUCTOR RF CH MLD 100UH 5 166DX 385LG INDUCTOR RF CH MLD 100UH 5 166DX 385LG INDUCTOR RF CH MLD 100UH 5 166DX 385LG INDUCTOR RF CH MLD 100UH 596 166DX 385LG Mfr Code 28480 28480 28480 28480 28480 28480 05057 28480 28480 28480 28480 28480 28480 28480 Factory Selected Component Refer to Section 5 Replaceable Parts Mfr Part Number 08903 600 0160 2307 0160 2055 0160 2055 0160 2055 1250 1096 P 1476 1 1250 1096 1250 1096 1250 1096 9140 0210 9140 0210 9140 0210 9140 0210 16 A Errata part change 6 87 Model 8903 Reference Designation A13 21504 TO 2652A HP Part Number C D Qty A13 08903 60129 4 1 2717A TO 27124 A13 08903 50192 1 1 2813A TO 2922A A13 08993 50292 2 1 27174 TO 27 1248 118 0180 2317 8 2 2580 0271 1 5 A13C2 0180 2317 8 2680 0271 1 5 A13C3 0180 C452 n 1 2600 0271 1 6 BRITIA TO 0130 2317 6 2 2550 0029 1 5 2150 0012 9 6 ALSC 0180 2317 8 2682 0059 1 6 2190 0012 6 AJ3C2 0180 0452 8 1 2680 0020 1 6 2190 0012 9 6 24504 TO 20224 23 0180 0291 3 11365 0186 0116 A13C6 0180 0291 3 13 7 0140 0210 2 1 13 8 0180 0197 8 13 9 0180 0197 8 A13C10 0180 0116 1 A13C11 0180 0197 8 13 12 0160 0570 5 1 13 13 0162 2307 4 13 14 0150 2307 A A13C
241. Oz500MW HEAT SINK TO 18 CS THYRISTOR SCR VRRM 50 WASHER LK HLCL NO 6 141 IN ID SCREW MACH 6 32 562 IN LG PAN HD POZI NUT HEX DBL CHAM 6 32 1HOD 109 IN THK WASHER FL MTLC NO 6 149 IN ID THYRISTOR TRIAC TO 220AB WASHER LK HLCL NO 6 141 IN ID SCREW MACH 6 32 562 IN LG PAN HD POZI NUT HEX DBL CHAM 6 32 THD 109 IN THK WASHER FL MTLC NO 6 149 IN ID THYRISTOR SCR VRRM 400 THYRISTOR SCR VRRM 400 THYRISTOR SCR VRRM 400 THYRISTOR SCR VRRM z 400 THYRISTOR SCR VRRM 400 THYRISTOR SCR VRRM 400 NOT ASSIGNED TRANSISTOR NPN 2N2222 TO 18 PD SOOMW T actory Selected Component Refer to Mfr Code 08903 60129 192 292 SERIAL PREFIX 2450A TO 2922A 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 04713 28480 04713 28480 00000 28420 28480 28480 28480 00000 28480 28480 31585 31 585 3585 31585 31585 31585 04712 recton D Mode 8903B Mfr Part Number 1901 0159 1901 0033 1901 0033 1901 0033 1901 0033 1901 0159 1901 0159 1901 0159 1901 0159 1901 0159 1801 0158 5082 4984 5082 4984 5082 4984 5082 4984 1251 4736 1251 3412 1251 5169 8159 0005 8159 0005 1251 5169 9140 0137 9100 3922 9100 3022 9100 3022 9100 3922 9100 3022 9140 0210 0403 0285 2N2222A 1205 0012 MCRG49P 2Z 21
242. PA10X7R103K100V RPA10X7R103K100V RPA 10X7R103K 100V RPA 10X7R103K 100V RPA 10X7R103K 100V RPA 10X7R 103K 100V RPA10X7R 103K 100V RPA 10X7R103K 100V RPA10X7R 103K 100V RPA 10X7R 103K 100V 10 9 100 RPAZOX7R223K 100V RPA10CO0G151J100V RPAZOX7R223K 100V 5082 2800 CT4 1 8 T0 316R F 750 81 750 81 C4 1 8 T0 2151 F CT4 1 8 TO 51 1R F 4105003 4 1 8 1961 CT4 1 8 TO 316R F CT4 1 8 TO 1002 F 750 81 11 1028 24 155 1010 01 03 00 94 155 1010 0 1 03 00 94 155 1010 01 03 00 94 155 1010 01 03 00 94 155 1010 01 03 00 94 155 1010 01 03 00 94 155 1010 01 03 00 94 155 1010 01 03 00 SN74LS744N 0890 1 80004 SN74ULS74AN SN74LS26N 25152521 Errata part change 6 81 Replaceable Parts Table 6 3 Replaceable Parts Mfr Code 18324 01295 01295 01295 01295 01295 01295 01295 01295 01295 01295 01295 04713 01295 01295 51167 01295 73957 28480 28480 09535 09535 Reference HP Part C at D escription Designation Number D Y P A9UG 1820 1905 7 1 GATE TTL LS NOR DUAL 5 INP A9U7 1820 1198 0 2 GATE TTL LS QUAD 2 INP A9U8 1820 1689 4 2 IC INTERFACE XCVR INSTRUMENT BUS IEEE A9US 1820 1198 0 GATE TTL LS NAND QUAD 2 INP A9U10 1820 1689 4 IC INTERFACE XCVR INSTRUMENT BUS IEEE A9U11 1820 1200 5 2 IC INV TTL 16 HEX A9U12 1820 1112 8 IC FF TTL LS D TYPE POS EDGE TRIG A9U13 1820 1200 5 IC INV TTL LS HEX 9014 1820 1199 1 1 I
243. PACITOR FXD 01UF 10 100VDC CER 28480 CAPACITOR FXD 3 3PF 25 100VDC CER 28480 CAPACITOR FXD 1UF 10 SOVDC CER 28480 CAPACITOR FXD t2PF 5 100VOC CER 0 30 28480 DIODE GEN PRP 35V SOMA DO 35 28480 DIODE GEN PRP 35V 50MA DO 35 28480 DIODE SWITCHING 80 200MA 2NS DO 35 28480 DIODE SWITCHING 80V 200MA 2NS DO 35 28480 DIODE SWITCHING 30V 50MA 2NS DO 35 28480 DIODE GEN PRP 35V 50MA DO 35 28480 DIODE GEN PRP 35V SOMA DO 35 28480 DIODE GEN PRP 35V 50MA DO 35 28480 DIODE GEN PRP 35V 50MA DO 35 28480 DIODE SWITCHING 80V 200MA 2NS DO 35 28480 DOIODE SWITCHING 80V 200MA 2NS DO 35 28480 DIODE GEN PRP 125MA DO 35 28480 DIODE SWITCHING 80V 200MA 2NS DO 35 28480 DIODE SWITCHING 80V 200MA 2NS DO 35 28480 DIODE SWITCHING 80V 200 2NS DO 35 28480 factory Selected Component Refer te Section 5 Model 8903B Mfr Part Number 0160 4835 0160 4805 0160 4835 0160 4835 0160 4799 1500156X902082 0160 4814 0160 3324 0160 4835 0160 4835 0160 4653 0160 4835 0160 4814 0160 4653 0160 4653 0160 4653 0160 4653 0160 4553 0160 4843 150D225X9015B2 1500226X9015B2 150D225X9015B2 150D606X900682 0160 4807 0160 4397 150D105X9035A2 0160 5254 0160 4832 0160 4832 0160 4797 0160 4835 0160 4790 1901 0376 1901 0376 1901 0050 1901 0050 1901 0040 1901 0376 1901 0376 1901 0375 1901 0376 1901 0050 1901 0050 1901 0880 1901 0050 1901 0050 1901 0050 Errata part change 16 90 Model
244. PEAK DETECTOR T SINAD LOG RATIO METER AMPLIFIE METER TRANSCONDUCT ANCE NC 15 b U25A 12 13 0 1 R283 CRIS ON 4 5k 15 ms Ha 2 2 19 6k 5 40108 1 1 CMOS CR29 7 A 03 M 15 R79 C51 6 Ns 7 7588 156 2 CR30 3 R208 4 4 4 3 R204 4 R2g7 C 162 289 RG 3 16k 15 15V 18k 75k 15V 15V o METER i V CAL QUAS DEA I 1 oe A 208 DU MOFF 00 MPEG 7 CH i l au I c Os s 8 X t F sha s t t nama Q rra s m samaq Qm amma A aaraaarawm s G r Ee SERIAL EFIX 2730A OUTPUT OVLD L P O A13 1 y P O TO LATCH 9 G 12 P O At KEYBOARD ANO DISPLAY ASSEMBLY 08903 60166 E 1 1 1 656 10 87 ee Oe Model 8903B E Service CHANGES On the Component Locator All serial prefixes e U1 U2 U6 U8 U12 U13 U1 U2 U6 U8 1 12 and 013 are round cans and the tabs should be in the 2 00 o clock position e U29A On the left hand side of the new A4 OUTPUT AMPLIFIER VOLTMETER ASSEMBLY 08903 60183 locate U29A and change pin 1 to 2 and pin 2 to 1 e Delete the page number 8B 116 3 on the schematic foldout that is tied to serial prefix 2730A and rep
245. POWER UP CHECKS When the Audio Analyzer is first turned on or if Special Function 40 0 is entered the instrument goes through a series of operational checks When a check fails an error code is output for two seconds on the four internal TEST LEDs on the 8 Controller Counter Assembly The sequence then continues on to the next check Except for the check of the front panel LED annunciators no indication of the power up sequence or results is given on the front panel displays The principal advantages to using the Power Up Checks are that the keyboard and display need not be operational To use the Power Up Checks remove the top cover refer to Top and Bottom Cover Removal Service Sheet remove any signal at the INPUT and switch the LINE to OFF for five seconds to discharge the supplies back to ON Observe the four TEST LEDs on the top of the Controller Counter Assembly as the instrument powers up The LEDs should light in the following sequence Indeterminate for about 1 8 second 2 X X1 for about 1 second 3 8 4 2 1 for about 2 seconds 4 8 4 2 1 with 1 blinking indefinitely until a key is pressed The Power Up Checks actually begin at step 2 above and are carried out in the following order 1 Front Panel Annunciator Check front panel LEDs and display segments and decimal points are lighted and remain so throughout the tests that follow and for about one second afterwards Failure of one
246. R CAPACITOR FXD 10PF 5 100VDC CER 0 30 NOT ASSIGNED CAPACITOR FXD 01UF 10 100VDC CER CAPACITOR FXD 01UF 10 100VDC CER CAPACITOR FXD 18UF 1 200VDC CAPACITOR FXD 0223UF 1 200VDC CAPACITOR FXD 2470PF 1 100VDC MICA CAPACITOR FXD 355PF 1 100VDC MICA CAPACITOR FXD 100 1096 20VDC TA CAPACITOR FXD 100UF 75 10 25VDC AL CAPACITOR FXD 01UF 10 100VDC CAPACITOR FXD 01UF 10 100VDC CER CAPACITOR FXD 01UF 10 100VDC CER CAPACITOR FXD 01UF 10 100VDC CER CAPACITOR FXD 150PF 5 100VDC CER CAPACITOR FXD 4 7PF 5 100VDC CER CAPACITOR FXD 01UF 10 100VDC CER CAPACITOR FXD 01UF 10 100VDC CER CAPACITOR FXD 33PF 5 100VDC CER 0 30 CAPACITOR FXD 33PF 5 100VDC CER 0 30 CAPACITOR FXD 10UF 5 100VDC MET POLYC CAPACITOR FXD 033UF 5 100VDC CAPACITOR FXD 01UF 10 100VDC CER CAPACITOR FXD 01UF 10 100VDC CER CAPACITOR FXD 10 50VDC MET POLYC Mfr Code 28480 28480 56289 56289 28480 28480 28480 23480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 56289 56289 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 Factory Selected Component Refer to Section 5 Replaceable Parts Mfr Part Number 08903 60163 0160 4834 30D206G050CC2 3002066050 2 0160 4834 0160 4795 0160
247. R ASSEMBLY 28480 08903 60184 ABC 0160 4832 4 CAPACITOR FXD 01UF 80 209 100VDC CER 28480 0160 4832 2 0160 4832 4 CAPACITOR FXD O1UF 80 20 100VDC CER 28480 0160 4832 A8C3 0160 4832 4 CAPACITOR FXD 01UF 80 20 100VDC CER 28480 0160 4832 ABCA 0160 4632 4 CAPACITOR FXD 01UF 80 20 100VDC CER 28480 0150 4832 8 5 0160 4832 4 CAPACITOR FXD 01UF 80 20 100VDC CER 28480 0160 4832 A8C7 0160 4832 4 CAPACITOR FXD O1UF 80 20 100VDC CER 28480 0160 4832 8 0160 4832 4 CAPACITOR FXD 01UF 80 20 100VDC CER 28480 0160 4832 8 9 0160 4832 4 CAPACITOR FXD 01UF 80 20 100VDC CER 28480 0160 4832 8 10 0160 4832 4 CAPACITOR FXD 01UF 80 20 100VDC CER 28480 0160 4832 A8C11 0160 4832 4 CAPACITOR FXD 01UF 80 20 100VDC CER 28480 0150 4832 ABC12 0160 4832 4 CAPACITOR FXD 01UF 80 209 100VDC CER 28480 0160 4832 2652A TO 28364 1 0160 4832 4 CAPACITOR FXD O1UF 80 20 100VDC CER 28480 0160 4832 8 14 0160 4832 4 CAPACITOR FXD 01UF 80 20 100VDC CER 28480 0160 4832 2908A TO 20224 A8C13 0160 4822 2 CAPACITOR FXD 1000PF 10 100VDC 28480 0160 4822 0160 4822 2 CAPACITOR FXD 1000PF 10 100VDC 28480 0160 4922 ABC15 0180 0197 8 CAPACITOR FXD 2 2UF 10 20VDC 56289 1500225X9020A2 8 16 0180 0229 7 CAPACITOR FXD 33UF 10 10VDC 56209 150D 335X90 1082 17 0180 0197 8 CAPACITOR FXD 2 2UF 10 20VDC 56289 1500225 020 2 ABC18 0180 0197 8 CAFACITOR FXD 2 2UF 10 20VDC TA 56289 150D225X9020A2 ABC19 018
248. RESISTOR 300 1 125W F 0 100 24546 RESISTOR 3 16K 1 125W F 0 100 24546 RESISTOR 20K 1 125W 0 25 28480 RESISTOR 10K 1 125W F 0 25 28480 RESISTOR 1 47K 1 125W 0 100 24546 RESISTOR 17 8K 1 125W F TC 0 100 24546 RESISTOR 1 47 1 125W TC 0 100 24546 RESISTOR 6 81 1 125W 0 100 28480 RESISTOR 6 81 1 125W 0 100 28480 RESISTOR 2 15 1 125W F TC 0 100 24546 RESISTOR 7 5K 1 125W F 0 100 24546 RESISTOR 10K 1 125W 0 100 24546 RESISTOR 10K 1 125W 0 100 24546 RESISTOR 5 11K 1 125W F 0 100 24546 RESISTOR 19 6K 1 125 F 0 100 24546 RESISTOR 1K 1 125W 0 100 24546 RESISTOR TRMR 50K 10 C SIDE ADJ 17 TRN 02111 RESISTOR 1 24K 1 J25W F 0 100 24546 RESISTOR 383K 1 125W 0 100 28480 RESISTOR 1K 1 125W 0 100 24546 RESISTOR 5 11K 1 125W 0 100 24546 RESISTOR 37 68K 1 25W 0 25 28480 RESISTOR TRMR 5 10 SIDE ADJ 17 TRN 02111 RESISTOR 21 5K 1 125W TC 0 25 28480 RESISTOR TRMR 2K 10 C SIDE ADJ 17 TRN 02111 RESISTOR 237K 1 125W F TC 0 100 24546 RESISTOR 20K 1 125W F 0 25 28480 RESISTOR 237K 1 125W 0 100 24546 RESISTOR 5 11 1 125W 0 100 24546 RESISTOR 20K 1 125W TC 0 25 28480 RESISTOR 1K 1 125W 0 100 24546 RESISTOR 10K 1 125W TC 0 100 24546 RESISTOR 178K 1 125W 0 100 24546 NOT ASSIGNED NOT ASSIGNED RES
249. RESISTOR 5 11K 1 08W 0 100 24546 RESISTOR 21 5 1 OSW 0 100 24546 RESISTOR 21 5 1 05W TC 0 100 24546 RESISTOR 1K 1 05W F 0 100 24546 NOT ASSIGNED RESISTOR 10K 1 125W 0 25 28480 RESISTOR 20K 1 125W F 0 25 28480 NOT ASSIGNED RESISTOR 2 5K 1 125W 0 25 28480 RESISTOR 2 5K 1 125W F TC 0 25 28480 THERMISTOR TUB WITH AXL LEADS 1K OHM 28480 CONNECTOR SGL CONT 1 14 MM BSC SZ SO 28480 CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ 28480 CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ 28480 CONNECTOR SGL CONT PIN 1 14 5 62 SQ 28480 CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ 28480 CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ 28480 CONNECTOR SGL CONT 1 14 MM BSC SZ SQ 28480 CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SO 28480 CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SO 28480 CONNECTOR SGL CONT FIN 1 14MM BSC SZ SQ 28480 CONNECTOR SGL CONT PIN 1 14 5 52 SQ 28480 LOW DRIFT 99 07263 LOW DRIFT 99 07263 IC AMP GP DIP PKG 01295 IC OP AMP WB 8 DIP C PKG 066565 IC GP DIP PKG 01295 99 34371 SWITCH ANLG QUAD 16 DIP C 17856 IC WB 99 PKG 34371 IC SWITCH ANLG QUAD 16 DIP C PKG 17856 IC OP AMP LOW BIAS H IMPD QUAD 14 DIP P 04713 IC GATE TTL LS NAND QUAD 2 INP 01295 IC OP AMP LOW DRIFT TO 99 PKG 07263 IC WB TO 99 34371 IC LOW BIAS
250. RP 35V SOMA DO 35 28480 DIODE GEN PRP 35V DO 35 28480 DIODE GEN PRP 35V 50MA DO 35 28480 DIODE GEN PRP 35V 50MA DO 35 28480 DIODE GEN PHP 35V 50MA DO 35 28480 DIODE GEN PRP 125 DO 35 28480 DIODE GEN PRP 35V 50MA 35 28480 DIODE GEN PRP 35V DO 35 28480 DIODE GEN PRP 35V SOMA DO 35 28480 DIODE GEN PRP 35V 50MA DO 35 28480 DIODE GEN PRP 35V 50MA DO 35 28480 DIODE GEN PRP 35V 50MA 35 28480 DIODE GEN PRP 35V 50MA DO 35 28480 DIODE GEN PRP 35V 50MA DO 35 28480 DIODE GEN PRP 35V 50MA DO 35 28480 DIODE SWITCHING 80V 200MA 2 5 DO 35 28480 DIODE SWITCHING 80V 200MA 2NS DO 35 28480 DIODE SWITCHING 80V 200 2NS 00 35 28480 DIODE SWITCHING 80V 200 2NS 00 35 28480 DIODE SWITCHING 80V 200MA 2NS DO 35 28480 DIODE GEN PRP 125MA DO 35 23480 DIODC GEN PRP 125 DO 35 28480 OIODE GEN PRP 125MA DO 35 28480 DIODE GEN 125MA DO 35 28480 DIODE GEN PRP 125 DO 35 28480 DIODE GEN PRP 125MA DO 35 28480 DIODE GEN PRP 125 DO 35 28480 DIODE GEN PRP 125MA DO 35 28480 DIODE GEN PRP 125MA DO 35 28480 DIODE GEN PRP 125MA DO 35 28480 Factory Selected Component Refer te Section 5 Model 8903 Mfr Part Number 0160 2255 0160 4084 0160 3456 150D105X9035A2 0160 5031 0160 2055 0160 2055 0160 4521 1500105 9035 2 0160 2055 1500105 9035 2 0160 2055 0160 2055 0160 5254 0160 5254 1901 0376 1901 0376 1901 0376 1901 0376 1901 0376 1901 0880 1901 0376 1901 0376 1901 0376 1901 0376
251. SHEET 2 A2 Input Amplifier Assembly Output Circuits PRINCIPLES OF OPERATION General This portion of the Input Amplifier Assembly A2 contains a stage of programmable amplification the Weight ing Bandpass and High Pass Filters and the Input Range and Overload Detectors The output of the assembly drives the Notch Filter Programmable Gain Amplifier The input of the Programmable Gain Amplifier is ac coupled by C37 and C38 The amplifier itself is non inverting and has a gain as cataloged in Table 8B 15 Only one switch is closed at a time Table 8 15 Gain of the Programmable Gain Amplifier Switch Closed Gain dB Weighting Bandpass and High Pass Filters The Weighting Bandpass and High Pass Filters are optional plug on filters used for specialized testing applica tions None one or two filters can be installed If no filter is installed the filters are replaced by jumpers See Service Sheets 2A and 2B for a discussion of the filter circuits Input Range Detector The Input Range Detector U1 is a true rms detector which senses the signal level at the input to the Weighting Bandpass and High Pass Filters The output drives the dc voltmeter which is read by the Controller to determine the setting of input gain The detector is placed before the active filters to sense overloading since the filters can filter the overload signal components Since some filters have gain the sensitivity of the detector is increased to mat
252. SISTOR 12 1K 1 05W F 0 100 24546 RESISTOR 1K 1 125W F 0 100 24546 RESISTOR 7 5K 19e 125W 0 100 24546 RESISTOR 1 62K 1 05W F 0 100 24546 RESISTOR 21 5 1 125W 0 100 03888 RESISTOR 1K 1 125W TC x0 4 100 24546 RESISTOR 2 15K 1 125W TC 04 100 24546 RESISTOR 2 15K 1 125W F 0 100 24546 RESISTOR 21 5 1 125W TC 0 100 03888 RESISTOR 3 83K 1 125W F 0 100 24546 RESISTOR 3 83K 1 125W TC 0 100 24546 RESISTOR 10K 1 125W 0 100 24546 RESISTOR 10K 1 125W TC 0 100 24546 RESISTOR 21 5 1 125W F TC 0 100 03888 RESISTOR 21 5 1 125W 0 100 03888 CONNECTOR SGL CONT 1 14 MM BSC SZ SQ 28480 CONNECTOR SGL CONT PIN 1 14MM BSC SZ SO 28480 CONNECTOR SGL CONT PIN 1 14 5 52 SO 28480 CONNECTOR SGL CONT PIN 1 14 MM BSC SZ2 SQ 28480 CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SO 28480 CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ 28480 CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SO 28480 CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SO 28480 CONNECTOR SGL CONT PIN 1 14 MM BSC SZ SQ 28480 CONNECTOR SGL CONT PIN 1 14 6 52 SQ 28480 CONNECTOR SGL CONT 1 14 5 52 SQ 28480 IC GATE TTL LS NOR QUAD 2 INP 01295 iC COMPARATOR PRCN TO 99 PKG 01295 NOT ASSIGNED IC OP AMP LOW BIAS H IMPD TO 99 PKG 28480 LOW NOISE 8 DIF C PKG 52063 IC LINEAR 02480 MV TTL 5 MONOSTBL RETRIG DUAL 01295 COMPARATOR GP QUAD 14 DIP P PKG 01295
253. SISTOR 2K 1 125W 0 25 28480 0698 6624 RESISTOR 2 652 1 12W 28480 0699 1728 RESISTOR 1 62 1 125W F TC 0 100 24546 C4 1 8 TO 1621 F RESISTOR 1 62K 1 125W F TC 0 100 24546 C4 1 8 T0 1621 F RESISTOR 21 5 1 125W F 0 100 03888 PMES5 1 8 TO 21RS RESISTOR 21 5 1 125W F TC 04 100 03888 PMESS 1 8 TO 21R5 F RESISTOR 1 150K 1 12 28480 0699 1726 RESISTOR 3K 1 125W F TC 0 25 28480 0698 6348 RESISTOR 1 125W F TC 0 25 28480 0698 6348 RESISTOR 1 125W TC 0 25 28480 0698 6348 RESISTOR 1 125W F 0 25 28480 0698 6348 RESISTOR 21 5 1 125W 1 0 100 03888 55 1 8 0 215 RESISTOR 21 5 1 125W 0 100 03888 PMES55 1 8 TO 2 1R5 F Factory Selected Component Refer te Section 5 A Errat part change 6 61 6 62 Replaceable Parts Model 8903 Table 6 3 Replaceable Parts Reference HP Part C wq D Mfr escription Mfr Part Number Designation Number D y P Code A6R61 0699 1726 0 RESISTOR 1 150K 1 12W 28480 0699 1726 2 65 NOT ASSIGNED ABREG 0757 0346 2 4 RESISTOR 10 1 125W F TC 0 100 24546 C4 1 8 TO 10RO F A6F67 0757 0346 2 RESISTOR 10 1 125W F TC 0 100 24546 C4 1 8 T0 10R0 F A6RS8 0757 0346 2 RESISTOR 10 1 125W 0 100 24546 C4 1 8 T0 10R0 F AGR69 0757 0346 2 RESISTOR 10 1 125W 0 100 24546 C4 1 8 TO 10RO F 0811 3726 4 2 RESISTOR 25 42 1 75W 28480 0811 3726 A6F71 0811 3726 4 2 RESISTOR 25 42 1 75W 28480
254. SISTOR 4 64K 1 125W 0 100 24546 RESISTOR 21 5K 1 125 F TC 0 100 24546 NETWORK RES 8 SIP22 0K OHM X 7 01121 NETWORK RES 8 SIP68 0K OHM X 7 01121 RESISTOR 68 1K 1 125W 0 100 24545 RESISTOR 464 1 125W F 0 100 24546 RESISTOR 196K 1 125W TC 0 100 24546 RESISTOR 68 1K 1 125 F 0 100 24545 RESISTOR 16 2K 1 125W F 0 100 24546 RESISTOR 5 11 1 125W 0 100 24546 RESISTOR 348 1 125W F 0 100 24546 RESISTOR 348 1 125W F 0 100 24546 RESISTOR 348 1 125W F 0 100 24546 RESISTOR 348 1 125W 0 100 24546 NETWORK RES 8 SIP330 0 OHM X 7 01121 NETWORK RES 16 DIP330 0 OHM X 8 01121 NETWORK RES 16 DIP330 0 OHM X 8 01121 NETWORK RES 16 DIP330 0 OHM X 8 01121 Paetery Selected t nupianent Refer to Section 2 Mode 8903B Mfr Part Number 5041 0319 5041 0319 5041 1838 5041 0816 5041 0812 5041 0408 5044 1840 5041 1837 5041 0319 2041 0385 5041 0816 5041 0815 5041 0811 5041 0417 5041 1641 5041 1836 5041 0319 5041 0385 5041 0818 5041 0814 5041 0819 5041 1640 5041 0808 5041 1841 5041 1834 5041 1843 5041 1835 5041 0286 5041 1843 5041 0508 5041 0319 3168331 20BA472 4 1 0 4641 4 1 8 0 2152 208 223 208 683 4 1 8 10 6812 C4 1 8 TO 464R F 4 1 8 0 1963 4 1 8 0 6812 4 1 8 0 1622 4 1 8 70 5111 4 1 8 0 348 C4 1 8 T0 348R F C4 1 8 T0 348R F 4 1 8 0 348
255. SS 1 6 T9 5001 E 55 1 8 5001 4 1 8 10 1962 1021 881021 4 1 8 0 5111 4 1 8 70 5111 F CA4 1 8 TO 511 1 F 4 1 8 5111 4 1 8 10 5111 0699 0070 0699 0070 4 1 8 0 5111 C4 1 8 TO 5111 4 1 8 0 5111 C4 1 8 T0 5111 F 1015 1251 0600 1251 0600 1251 0600 1251 0600 1251 0600 1251 0500 4741 SOON 339 1826 0323 14081 8 5 741625914 SN74LS259N SN74LS138N SN74LS86N SN74LS175N SN74LS175N A WVrrats part change rev 1GFEB90 Model 3903 16 90 Reference HP Part C Qty Designation Number D 7011 1820 1195 7 7012 1820 1112 8 7 7013 1820 1112 7014 1820 1112 8 7015 1820 0269 4 1 7016 1820 1197 9 7017 1826 0371 1 A7U18 1826 1018 5 1 A7U19 1826 0188 8 A7U20 1820 1729 3 A7U21 1820 1729 3 A7U22 1820 1729 3 A7U23 1820 1729 3 A7U24 1820 1729 3 A7U25 1820 1729 3 A7U26 1820 1729 3 7027 1820 1729 3 A7U28 1820 1729 3 A7U29 1820 1729 3 A7U30 1920 1199 1 4 Refer to Section 7 for update information Table 6 3 Replaceable Parts Mfr Description Cade IC FF TTL LS D TYPE POS EDGE TRIG COM 01295 IC FF TTL LS D TYPE POS EDGE TRIG 01295 IC FF TTL LS D TYPE POS EDGE TRIG 01295 IC FF TTL LS D TYPE POS EDGE TRIG 01295 IC GATE TTL NAND QUAD 2 INP 01295 IC GATE TTL LS NAND QUAD 2 INP 01295 OP LOW BIAS H IMPD TO 99 PKG 27014 ANALOG SWITCH 4SPST 16 DIP P 28480 IC CONV 8 B
256. STOR 19 6K 1 125W TC 0 100 24546 RESISTOR 1M 1 125W F 0 25 28480 RESISTOR 21 5 1 e 125W 0 100 03888 RESISTOR 256K 1 125W TC 0 25 19701 RESISTOR 128K 1 125W 0 25 19701 RESIS 3 16K 1 125W TC 0 100 24546 RESISTOR 1 47K 1 125W F TC 0 100 24546 RESISTOR 1 96K 1 125W TC 0 100 24546 RESISTOR 9 09 1 125W TC 0 100 19701 RESISTOR 31 6K 1 125W F TC 0 100 24546 RESISTOR 1K 1 125W F 0 100 24546 RESISTOR 17 8K 1 125W TC 0 100 24546 Factery Selected Component Refer to Section 5 Model 8903B Mfr Part Number MF4C1 8 T9 15981 P MF4C 1 8 79 3202 MF 4C 1 8 19 6402 B 4 1 8 9 1283 MF4C 1 8 T9 2563 B 0699 0676 0699 0730 C4 1 8 TO 562H F C4 1 8 T0 1622 F 2084103 MF4C 1 8 T0 6191 F C4 1 8 TO 51R1t F 4 1 8 0 1002 Ca 1 8 TO 1002 F PME55 1 8 T0 21R5 F 5 1 8 TO 21R5 F C4 1 8 T0 1001 4 1 8 79 7981 4 1 8 79 15981 4 1 8 19 3202 6 4 1 8 9 6402 MF4C1 B T9 1283 E MF4C 1 8 T9 2563 B 0699 0576 0699 0730 PMESS 1 8 T0 21R5 PME55 1 8 10 21R5 F C4 1 8 TO 51R1 F 55 1 8 0 21 5 PMES55 1 8 T0 21R5 F C4 1 8 TQ 1001 F MF4C 1 8 T9 6402 B MF4C1 8 T9 3202 E MF4C1 8 10 15981 R 4 1 8 9 7981 PMESS 1 8 T0 21R5 F 4 1 8 0 4222 4 1 8 0 1952 C4 1 8 T0 1962 0699 0730 PMES5 1 8 TO 21R5 1 8 79 2563 MF4C1 8 T9 1283 4 1 8 0 3161
257. STOR J FET 2N4391 N CHAN D MODE 28480 1855 0420 A3Q33 1855 0420 2 TRANSISTOR J FET 2N4391 N CHAN D MODE 28480 1855 0420 4 1855 0420 2 TRANSISTOR J FET 2N4391 N CHAN O MODE 28480 1855 0420 A3Q35 1855 0420 2 TRANSISTOR J FET 244391 N CHAN D MODE 28480 1855 0420 1 0698 3152 8 RESISTOR 3 48 1 125W TC 0 100 24546 C4 1 8 T0 3481 F 2 1810 0208 0 2 NETWORK RES 8 SIP68 0K OHM X 7 01121 208 683 A3R3 1810 0208 0 NETWORK RES 8 SIP68 0K OHM X 7 01121 208A583 0698 3160 8 6 RESISTOR 31 6 1 125W F TC 0 100 24546 C4 1 8 TO 3162 F A3R5 0698 3160 8 RESISTOR 31 6K 1 125W F 0 100 24546 C4 1 8 T0 3162 F A3R6 0698 6360 6 18 RESISTOR 10K 1 125W F TC 0 25 28480 0698 6360 0698 6350 6 RESISTOR 10K 1 125W 0 25 28480 0698 6350 0698 0004 9 7 RESISTOR 2 15K 1 125W F 0 100 24546 4 1 8 0 2151 A3R9 0698 6360 6 RESISTOR 10K 1 125W 0 25 28480 0698 6360 A3R10 0757 0280 3 RESISTOR 1K 1 125W TC 0 100 24546 C4 1 8 TO 1001 F A3R 11 0698 8204 1 6 RESISTOR 7 98K 1 125W F TC 0 25 19701 4 1 8 9 7981 12 0698 8205 2 5 RESISTOR 15 98 1 125W 0 25 19701 4 1 8 9 15981 A3R13 0698 8047 0 5 RESISTOR 32K 1 125W 0 25 19701 4 1 8 9 3202 8 A3R14 0698 8040 2 5 RESISTOR 64K 1 125W F 0 25 19701 MF4C1 8 19 6402 P A3R15 0698 8053 8 5 RESISTOR 128K 1 125W 0 25 19701 4 1 8 79 1283 A3R16 0698 8050 5 5 RESISTOR 256K 1 1
258. Special Function 61 4 except port is displayed The display is interpreted as shown in Table 8 5 Displays the HP IB Status Register with lt SPM gt lt STSO gt SRQ LLO in the left display and REM ADRSD TRIG lt HOLD DELAY gt the right display The status register is contained in RAM 8 14 rev 20J UN87
259. TING SERVICE SHEET 7 Figure 8B 37 Voltage to Time Converter Check X 4 3 Step 4 8B 54 REUS MM a o uu Service Model 8903B CHANGES All serial prefixes On the block diagram TP1 TP5 6 In the FILTER ASSEMBLY change 5 to TP6 change TP6 to TP5 and change to BD2 8B 100 14 89 FROM LATCH BD4 A2 INPUT AMPLIFIER ASSEMBLY _ NPUT OVER acvoc I DIFFERENTIAL TO SINGLE j SWITCH ATTENUATOR 7 ENDED AMPLIFIER HIGH INPUT TP HIGH 300V MAX m 048 n y gt s hoo mo 0 s m 4 300 HIGH PASS FILTERS WEIGHTING BP FILTERS PROGRAMMABLE Z GAIN AMPLIFIER PRM LAA AMP TP4 y INPUT RANGE l I DETECTOR RMS gt 4 OUTPU AMPLIFIER VOLTMETER ASSEMBLY r Z ATTENUATOR Z _ 4 LOW PASS FILTERS ATTENUATOR toa BUFFER HIGH us j i e SUM AND 1 FILTER OUTPUT AMPLIFIER 1 AMP 2 A37 AMP 3 A 37 4 de TP6 TP5 20 PB 3 te er i m l m 2 x L oO m 1 TO LATCH PRE NOTCH 1 RMS AVG ifi
260. TOR J FET 2N4393 N CHAN D MODE TRANSISTOR J FET 2N4393 N CHAN D MODE TRANSISTOR J FET 2N4391 D MODE TRANSISTOR J FET 2 4391 N CHAN D MODE TRANSISTOR J FET 2N4393 N CHAN D MODE TRANSISTOR J FET 2N4393 N CHAN D MODE TRANSISTOR J FET 2N4393 N CHAN D MODE TRANSISTOR J FET 2N4393 N CHAN D MODE TRANSISTOR J FET 2N4393 N CHAN O MODE TRANSISTOR J FET 2N4391 N CHAN D MODE Mfr Code 28480 28480 28480 28480 28480 28480 28480 28480 26480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28490 28480 28480 28480 28480 28480 28480 28480 28480 28480 02768 04713 04713 04713 28480 28480 04713 04713 04713 04713 04713 28480 Factory Selected Component Refer te Section 5 Model 903 Mfr Part Number 0160 4233 0160 3531 0160 5528 0160 4832 0160 4832 0160 4832 0160 4832 0160 4835 0160 4835 0160 0577 0160 4832 0160 4832 0160 5559 1901 0033 1901 0033 1901 0050 1901 0050 1901 0050 1901 0050 1901 0050 1901 0050 1901 0050 1901 0050 1907 0050 1901 0050 1901 0518 1901 0518 9140 0114 9100 2430 4040 0748 1480 0116 4040 0751 1480 0116 207 120241 03 0101 244393 234393 24393 1855 0450 1855 0420 2 4393 244393 244393 234393 244393 1855 0420 A Errata part change rev 1GFEB90 Model 8903 Table 6 3 Replaceable Parts Replaceable Parts Reference HP Part C i Mfr Designation
261. The other three data readback lines are unaffected by the readback command and remain 000 Thus the d read back is 0000 If A7U14 is reset A7U15B puts a low on the least significant data bit r 1 and the data read back is 0001 The displays are therefore 0001 0000 Note that rrrr is different from wwww If d is keyed in as a hexadecimal the displays are 1111 1111 regardless of the state of A7U15B This is because all output devices on the data I O port of the Controller are on logical 1 One final note after a Direct Control Special Function is entered it is periodically re issued to the Instrument Bus If a fault causes rrrr to indicate a malfunction the display will begin to read correctly as soon as the fg 8 10 rev 20JUN87 Model 8908 1 fault is removed For example if you key 0 700 SPCL then increase the input signal level until an overload condition is reached you will find that the displays show 0000 0000 continuously except for the instant the overload is detected when the displays momentarily blink 0001 0000 An automatic resetting of the input circuits removes the overload as soon as it is detected so the overload is observed only for one period of the Direct Control Special Function cycle 8 23 Service Special Functions Prefix 40 99 The Service Special Functions are used to perform a variety of tasks related to service T he functions are cataloged below suffix N indicates
262. The total quantities for optional assemblies are to talled by assembly and not integrated into the standard list 6 4 FACTORY SELECTED PARTS Parts marked with an asterisk are factory selected parts value listed in the parts list is the nominal value Refer to Sections 5 and 8 of this manual for information on determining what value to use for replacement 6 5 PARTS LIST UPDATING MANUAL UPDATES Production changes to the Audio Analyzer made after the publication date of this manual are accompanied by a change in the serial number prefix Changes to the parts list are recorded by serial number prefix on an addition or replacement page s The MANUAL UPDATE pages can be ordered by filling out and returning the DOCUMENTATION UPDATE SERVICE REQUEST reply card found in the begin ning of this service manual 6 6 ILLUSTRATED PARTS BREAKDOWNS Most mechanical parts are identified in Figure 6 1 through 6 5 These figures are located at the end of the replaceable parts table 6 7 ORDERING INFORMATION To order a part listed in the replaceable parts table include the Hewlett Packard part number with the check digit and the quantity required Address the order to the nearest Hewlett Packard office check digit will ensure accurate and timely processing of your order To order a part that is not listed in the replaceable parts table include the instrument model number instrument serial number description
263. U29D have their inputs and outputs grounded On the A13 schematic SS6 Add the new schematic on page 8B 116 3 rev 10MAYS87 keep the original schematic On the A13 schematic e 08903 60292 Change the part number of the A13 POWER SUPPLY AND MOTHERBOARD ASSEMBLY from 08903 60192 to 08903 60292 rev 4FEB89 Model 8908 2816 for HP8903B and 2818A and above for HP8903E Service CHANGES Under Notes e Add the following notes Note 7 The 08903 60183 does not have a W1 jumper wire Note 8 08903 60283 and the 08903 60282 are identical boards except for the position of the W1 jumper wire See the partial schematic on page 8B 116 5 and the Component Locator on page 8B 116 6 On the A4 schematic A4 In the upper left hand corner of the schematic change the board part number to 08903 60283 Note The 08903 60282 and 08903 60283 are identical boards except for the positioning of W1 See the partial schematic on page 8B 116 5 and the Component Locator on page 8B 116 6 6 Use the schematic partial on page 8B 116 5 On the Component Locator 4 Use the component locator on page 8B 116 6 for serial prefixes 2816A and above 8903B and 2818A and above 8903 rev 14FEB89 SS6 8 116 3 Service Model 8903B E Reserved for future changes SS6 8B 116 4 rev 14FEB89 Service 8903B E 8 8 8 U29A Wi 45
264. V NC 15V U25A X 12 13 Q PEAK 1 4 13K C 16 C3 P 3 2 35 1 i 7 1 05 i 4 x 5 4 w 1 U25C 3 r3 12 8 0 XA4B 2 amp 24 OU MOFF w 5 5 s sasa SERiAL PREF 1x 26184 WI Jumper in the 08903 60283 position i E U29A I i 5 NC 15 14 U25A X 12 13 Q PEAK 1 13652 De lt 9 2 gt 3 l 1 i 7 1 CMOS 8 S 4 U i EM U25C 9 n 1 s 8 B 15 cD 24 OU MOFF E 18 OU MPEG j 5 7 zd GCGWELDINETER IUIEM S W1 Jumper in the 08903 60282 position Changes to Figure 8 116 3 8903E 28184 above SS6 Changes to Figure 8B 116 3 8903B 28164 and above rev 01JUN amp S 8 116 5 Service Model 8903B E aya Djati TER MAE 3 1 2 dis ar W 174 1 5 176 catt ATION 199 PIB IURAT LON 4 gt urs A n p ot dos DN n B n IRD mita E ua er x ut wne ems 00903 62101 ode 0070 0202 Position 556 Figure 8 116 Component Locator 8903E 29184 and above rev 1L IUNSS Figure 88 116 Componcut Locator 8903 28164 and above 8B 116 6 ass CEDERE INE eee ko an FILTER AMPLIFIER FULL WAVE RECTIFIER L065 AMPLIFIER lt 2 gt lt 3 gt
265. V 200MA 2NS DO 35 DIODE SWITCHING 80V 200MA 2NS DO 35 DIODE SWITCHING 80V 200MA 2NS DO 35 DIODE SWITCHING 80V 200MA 2NS DO 35 NOT ASSIGNED DIODE GEN PRP 35V 50MA DO 35 DIODE SWITCHING 80V 200MA 2NS 00 354 DIODE GEN PRP 35V 50MA DO 35 DIODE SWITCHING 80V 200MA 2NS DO 35 DIODE SWITCHING 80V 200 2NS DO 35 DIODE GEN PRP 125MA 00 35 DIODE SWITCHING 80V 200MA 2NS DO 35 DIODE GEN PRP 125MA DO 35 NOT ASSIGNED DIODE SWITCHING 80V 200MA 2NS DO 35 NOT ASSIGNED NOT ASSIGNED DIODE SWITCHING 80V 200MA 2NS DO 35 DIODE SWITCHING 80V 200MA 2NS DO 35 NOT ASSIGNED DIODE SWITCHING 80V 200MA 2NS 00 35 DIODE SWITCHING 200MA 2NS 00 35 DIODE GEN PRP 35V 5 DO 35 DIODE SWITCHING 80V 200MA 2NS 00 35 DIODE GEN PRP 35V 50 00 35 DIODE GEN 125MA DO 35 DIODE SWITCHING 80V 200MA 2NS DO 35 DIODE GEN PRP 125MA DO 35 DIODE SWITCHING 80V 200MA 2NS DO 35 NOT ASSIGNED DIODE SWITCHING 80V 200MA 2NS DO 35 RELAY REED 1A 500MA 100VDC 5VDC COIL RELAY REED 1A 500MA 100VDC SVDC COIL NOT ASSIGNED RRLY 50W2A SVDC 50W2A SVDC RRLY 50W2A 5VDC RRLY 50W2A 5VDC INDUCTOR RF CH MLD 10UH 10 1660X 385LG INDUCTOR RF CH MLD 220UH 10 INDUCTOR RF CH MLD 10UH 10 166DX 385LG Factory Selected Component Refer te Section Replaceable Parts Mfr Part Number Code 28480 1901 0050 28480 1901 0050 28480 1901 0050 28480 1901 0050 28480 1901 0050 28480 1901 0050 28480 1901 0050 28480 1901 0376 28480 1901 0050 284
266. Y PROGRAMMABLE FROM DIFFERENTIAL GAIN AMPLIFIER TO TO SINGLE ENDED HIGH PASS FILTERS AMPLIFIER gt AND WEIGHTING BP FILTERS Figure 8 4 Example Showing Programmable Gain Amplifier Switching hardware will revert back to the measurement mode it was in before the Direct Control Special Function was entered Thus in this example unless 8 dB gain had been previously set it would be removed from the audio path when any other key is pressed However note that there are some Service Special Functions that will maintain the requested configurations even if another key is pressed it turns out other 0 724 codes than those shown in Table 8 2 will affect the gain of the Programmable Gain Amplifier For example 0 723 will close U11 3 and U11 1 simultaneously gain is now 10 6 dB This fact is ascertained from the service sheet schematics Example 2 second example from the A2 assembly illustrates data readback One of the means of detecting an overrange of the input circuits is by the Input Overload Detector The detector connects to both the high and low inputs directly and output through the Input Range Detector of the Programmable Gain Amplifier of Example 1 See Figure 8 5 At the input of the amplifier the Input Overload Detector senses the dc level and compares it against both a positive and negative reference At the output of the Input Range Detector it also compares the dc level and hence the ac level of the
267. Y X is output to the TEST LEDs for two seconds See Service Sheets BD4 and 17 p I oA AS 8 18 rev 20SEP87 Model 8903B Service CONTROLLER TEST LEDS AND TEST POINTS 8 28 CONTROLLER TEST LEDS AND TEST POINTS Near the top edge of the A8 Controller Counter Assembly are located four test points and four associated LED annunciators labeled TEST which are used primarily for troubleshooting the instrument The LED annunciators are labeled from left to right 8 4 2 and 1 and are associated with test points A B C and D respectively The label on the annunciators is sometimes used to represent a binary weighting They function in the following way 1 At instrument power up the TEST annunciators light in a certain sequence that indicates proper functioning of several vital areas of the instrument failure in any of the areas is indicated on the annunciators For details see Power Up Checks paragraph 8 27 2 After power up annunciator 1 toggles once for each measurement cycle 3 After power up annunciator 2 toggles once for each keyboard interrupt that is each time a key is pressed 4 After power up annunciator 4 toggles once for each HP IB interrupt Grounding of certain of the TEST test points alters instrument operation in the following ways 1 Grounding test point C on power up initiates the Counter Latch and Controller I O signature analysis troubleshooting routines See Service Sheet 14 2 Grounding test point
268. a DETECTOR TO LATCH I L2 BD4 1 BD4 COD FROM LATCH 2804 ot OUTPUT OUTPUT SINAD LOG RATIO i METER FROM LATCH A RMS AVG OVERLOAD Z METER AMPLIFIER A TRANSCONDUCT ANCE DETECTOR DETECTOR MER LL SINAD EN OUT ML gt gt Yo TUNE TUNE 12804 Z COMPARATOR 7 TUNE TO LATCH Ii Z INTEGRATOR i GAIN TUNE SWITCH i XL METER PEd OFF y SWITCH 6 NOTCH AMPLIFIER x NOTCH AMP INVERTING AMPLIFIER L 5 MULTIPLIER VOLTMETER INPUT SELECTOR RIPPLE FILTER N GAIN BALANCE BALANCE SWITCH 7 7 INTEGRATOR 7 Z MULTIPLIER 7 TIOE pe BALANCE FILTER ES r 2 SINAD TPS N o lt o 1 ag CON m kak 8 FROM COUNTER BD4C pm VOLTAGE TO TIME CONVERTER COMPARATOR TP10 TO COUNTER J BD4 a 7 224 BD2 1 Figure 88 10 8B 10 Service Model 8903B Component Coordinates COMP coMP X Y NOTES 1 Pinouts for F E T s Q7 8 9 and 10 SA GB GA SB 2 RF choke inductance is 2 5 to 6 uH at 1 MHz 3 Asterisk indicates factory selected values 4 FETs 07 Q9 each are dual FETs must be rep
269. a tee adapter 2 Connect a high impedance ac coupled oscilloscope to the tee at the HIGH INPUT Use the oscilloscope s vertical gain controls to adjust the display amplitude for 5 divisions peak to peak deflection of the sinusoidal signal The period of the signal should be 1 ms 3 Connect the oscilloscope to A2TP5 SING END Key in the Special Functions listed in Table 8B 4 For each setting increase the oscilloscope s vertical gain by the amount indicated The peak to peak amplitude displayed on the oscilloscope should be within the limits indicated If faulty see Service Sheet 1 and check the High Input Attenuator Table 8B 4 Amplitude Limits at A2TP5 Step 3 Total Change Amplitude Limits divisions pk pk Special in Oscilloscope Function Gain 4 Set the INPUT switch to FLOAT Connect the HIGH OUTPUT to the LOW INPUT Short the HIGH INPUT to ground 5 Key in the Special Functions listed in Table 8B 5 For each setting decrease the oscilloscope s vertical gain by the amount indicated The peak to peak amplitude displayed on the oscilloscope should be within the limits indicated If faulty see Service Sheet 1 and check the Low Input Attenuator 6 On the Audio Analyzer key in AMPTD 1 V Readjust the oscilloscope s vertical gain for a display of 5 divisions peak to peak 7 Reduce the oscilloscope s gain by a factor of 10 Key in the Special Functions listed in Table 8B 6 The peak to peak ampli
270. al level at the input to the Output RMS Average Quasi peak Detector is normally between 0 3 and Attenuator 1 is set to either 0 or 20 dB Amplifier 1 has a gain of 14 dB Low Pass Filters are selected from the front panel or HP IB The 3 dB frequencies of the filters are 30 kHz 80 kHz and 750 kHz The latter filter is selected when the other two filters are off filters are active types and have 6 dB gain 8A 2 rev 20JU N87 Model 8903B Service Attenuator 2 is set to either 0 or 20 dB Amplifier 3 has a gain of 20 dB Attenuator 3 is set to either 0 or 20 dB The Buffer amplifier has 0 dB gain The High Pass Filter is set to 0 3 Hz in the ac level measurement mode to ensure accuracy down to 20 Hz otherwise it is set to 13 Hz to speed up measurement time Amplifier 4 has 20 dB gain The output from Amplifier 4 is the rear panel MONITOR output signal an input to the Counter since this is the point of greatest sensitivity in the ac level measurement mode and the input to the Output RMS Average Quasi peak Detector The Output RMS Average Quasi peak Detector is used to set the gain of the output path Attenuators 1 2 and 3 and after processing by the Controller its output is also used as tbe numerator of the distortion measurement or the denominator of the SINAD measurement detector can also be configured to respond to the absolute average or quasi peak value of the signal instead of the true RMS value The Output Ove
271. and check the Pre Notch RMS Detector 3 Connect the voltmeter to A4TP1 DC OUT The voltage should read between 0 99 and 4 1 01 Vdc Hint If the voltage is out of limits perform the Output RMS Average Quasi peak Detector General Check 4 Insert 31 6 resistor in parallel with R56 This simulates a 6 dB SINAD 5 Connect the voltmeter to pin 14 of U17C The voltage should be between 320 and 360 mVdc Hint The voltage at pins 3 and 5 of Q4 should be between 500 and 480 mVdc 6 Connect the voltmeter to pin 5 of U17B The voltage should be the same as in step 5 except that the loading of a 10 voltmeter input will cause the signal level to be 0 3 low SINAD meter should read between 5 5 and 6 5 dB Hint The drains of Q5 and Q6 should read the same as pin 5 of U17B Q5 and Q6 should be off Pins 4 and 6 of 019 should be a TTL high Hint If the meter reads only slightly out of limits perform the SINAD Meter Adjustment paragraph 5 14 7 On the Audio Analyzer key in 0 528 SPCL to switch the SINAD meter off The voltage at pin 5 of U17B should read 0 to 10 mVdc The SINAD meter should read 0 Hint Q6 should be on Pin 4 of U19A should be a TTL low Pin 6 of U19B should be a TTL high 8 On the Audio Analyzer key in 0 524 SPCL to peg the meter The voltage at pin 5 of U17B should read between 1 5 and 2 5 Vdc The SINAD meter should read slightly above full scale Hint Q5 should be on Pin 6 of U19B shoul
272. and function of the part and the quantity of parts required Address the order to the nearest Hewlett Packard office Replaceable Parts NOTE Within the USA it is better to order di rectly from the HP Parts Center in Moun tain View California Ask your nearest HP office for information and forms for the Direct Mail Order System 6 8 RECOMMENDED SPARES LIST Stocking spare parts for an instrument is often done to ensure quick return to service after a malfunction occurs Hewlett Packard has prepared a Recom mended Spares list for this instrument The contents of the list are based on failure reports and repair 6 2 Model 8903B data Quantities given are for one year of parts sup port complimentary copy of the Recommended Spares list may be requested from your nearest Hewlett Packard office When stocking parts to support more than one Audio Analyzer or to support a variety of Hewlett Packard instruments it may be more economical to work from one consolidated list rather than simply adding to gether stocking quantities from the individual instru ment lists Hewlett Packard will prepare consolidated Recommended Spares lists for any number or com bination of instruments Contact your nearest Hewlett Packard office for details 8903 assembly attenuator isolator termination fan motor capacitor coupler diode diode thyristor varactor directional coupler delay line annuncia
273. ase with the input The in phase component represents a balance error in the Notch Filter that is the notch does not completely null out the signal The quadrature component represents a tuning error When perfectly tuned any output from an imperfectly balanced Notch Filter will be in phase with the input sense the in phase component a current produced by the input signal is chopped in phase with the input to the Notch Filter Chopper 5 is driven by the bandpass output of the Notch Filter which is in phase with the fundamental component of the input to the Notch Filter If is in phase with S as in this example the chopped current 1 will be a half wave rectified signal Current I is proportional to the input voltage but half the level of the chopped current I and L are summed together to produce a current Is whose average dc level represents the level error of the in phase component of the signal For this example the result is full wave rectified signal 15 is integrated that is amplified and filtered The integrated current controls the gain of the Balance Multiplier which balances the Notch Filter Sensing the quadrature component is similar current produced by the input signal is chopped in quadrature with the input to the Notch Filter Chopper S4 is driven by the low pass output of the Notch Filter which is 90 out of phase with the fundamental of the in
274. asurement modes the gain of the Output Amplifier is normally set to O dB whenever the signal detected by the Pre Notch RMS Average Detector exceeds 0 6V and a low pass filter has been selected This prevents the first amplifier after the Notch Filter from being overdriven by signals in the stopband which would normally be detected by the Output RMS Average Quasi peak Detector When this Special Function is invoked the Output RMS Average Quasi peak Detector is used to determine the gain setting of the Output Amplifier Use of this function permits measurement of filters such as the internal optional weighting bandpass filters with extended dynamic range but care must be taken not to overload the selected low pass filter either 30 or 80 kHz N 0 Output Amplifier gain determined normally N 1 Output Amplifier gain determined by the Output RMS Average Quasi peak Detector 49 N Display Internal Voltages Voltmeter measures and displays the internal voltage selected by 0 Ground See Service Sheet 7 N 1 Pre Notch RMS Average Detector with Ripple Filter See Service Sheets 2 and 7 N 2 DC Input Voltage without Filter See Service Sheet 1 N 3 Output RMS Average Quasi peak Detector with Ripple Filter See Service Sheets 6 and 7 4 Output RMS Average Quasi peak Detector See Service Sheet 6 N 5 Output RMS Average Quasi peak Detector with SINAD Filter See Service Sheets 6 and 7 N 6 Notch Tune Voltage See Service Sheet 4 N 7 DC Inpu
275. ative and be secured against any unintended operation If this instrument is to be energized via an auto transformer for voltage reduction make sure the common terminal is connected to the earth terminal of the power source If this product is not used as specified the protection provided by the equipment could be impaired This product must be used in a normal condition in which all means for protection are intact only No operator serviceable parts in this product Refer servicing to qualified personnel To prevent electrical shock do not remove covers Servicing instructions are for use by qualified personnel only To avoid electrical shock do not perform any servicing unless you are qualified to do so The opening of covers or removal of parts is likely to expose dangerous voltages Disconnect the product from all voltage sources while it is being opened The power cord is connected to internal capacitors that my remain live for 5 seconds after disconnecting the plug from its power supply For Continued protection against fire hazard replace the line fuse s only with 250 V fuse s or the same current rating and type for example normal blow or time delay Do not use repaired fuses or short circuited fuseholders Always use the three prong ac power cord supplied with this product Failure to ensure adequate earth grounding by not using this cord may cause product damage This product is designed for use in Installatio
276. ayed on the oscilloscope should be between 3 and 4 divisions If faulty see Service Sheet 5 and check the 30 kHz Low Pass Filter 13 On the Audio Analyzer key in 55 0 SPCL 56 15 SPCL and 57 140 SPCL to set the internal source to 13 Hz The peak to peak amplitude displayed on the oscilloscope should be between 4 6 and 5 4 divisions If faulty see Service Sheet 5 and check the High Pass Filter 14 On the Audio Analyzer key in 0 435 SPCL to insert the 13 Hz High Pass Filter Ignore the displays The peak to peak amplitude displayed on the oscilloscope should be between 3 and 4 divisions If faulty see Service Sheet 5 and check the High Pass Filter 8B 12 rev 20JUN87 Model 8903B Service Voltmeter Check 1 On the Audio Analyzer key in 41 0 SPCL to initialize the instrument Set the INPUT and OUTPUT switches to ground Key in AMPTD 300 mV Key in 1 11 SPCL to set the input to the 3V range Key in 3 2 SPCL to set the output to the 20 dB range Connect the HIGH OUTPUT to the HIGH INPUT 2 Connect a high impedance ac coupled oscilloscope to A4TP4 AMP 4 The waveform on the oscilloscope should be a sine wave with an amplitude between 8 and 9 Vpp and a period of approximately 1 ms If faulty see v3 Output Amplifier Check 3 DC couple the oscilloscope and connect it to A4TP1 DC OUT The waveform should be a dc voltage between 2 8 and 3 2 Vdc If faulty see Service Sheet 6 and check the Output RMS Average Quasi peak Detecto
277. ble 6 3 Replaceable Parts Description REMOTE INTERFACE CONNECTOR ASSEMBLY CONNECTOR 24 PIN F MICRORIBBON STANDOFF HEX 327 IN LG 6 32THD WASHER LK HLCL NO 10 194 IN ID CLEVIS 0 070 IN W SLT 0 454 IN WASHER LK HLCL NO 4 115 IN ID SCREW MACH 4 40 438 IN LG PAN HD POZI NUT HEX DBL CHAM 4 40 THD 062 IN THK Mfr Code 28480 28480 00000 28480 00000 28480 00000 28480 Factory Selected Component Refer to Replaceable Parts Mfr Part Number 08903 60 108 1251 3283 ORDER BY DESCRIPTION 2190 0034 OROER DESCRIPTION 2190 0019 ORDER BY DESCRIPTION 2260 0002 A Errata part change 6 83 8903B Replaceable Parts Table 6 3 Replaceable Parts Reference HP Part C D nfi Mtr escription Mfr Part Number Designation Number D Ory ds Code A11 08903 60015 7 1 SERIES REGULATOR SOCKET ASSEMBLY 28480 08903 60015 A11C1 0180 0116 1 CAPACITOR FXD 6 8UF 10 35VDC 56289 150D685X9035B2 A11C2 0180 0116 1 CAPACITOR FXD 6 8UF 10 35VDC TA 56289 1500685 903582 11 3 0180 0116 1 CAPACITOR FXD 6 8UF 10 35VDC TA 56289 1500685 9035 2 A11C4 0180 0116 1 CAPACITOR FXD 6 8UF 10 35VOC 56289 150D685X9035B2 A11F1 2110 0001 8 2 FUSE 1A 250V NTD 1 25X 25 UL 75915 312001 A11F2 2110 0294 1 1 FUSE 4 32 1 25X 25 28480 2110 0294 11 2110 0001 8 FUSE 1 250V 1 25X 25 UL 75915 312001 11 1 2110 0269 0 6 FUSEHOLDER CLIP 250 28480
278. ce HP Part C Qty Designation Number D A4R142 2100 3350 5 A4R145 0698 7270 9 A4R146 0698 6630 3 A4R147 0698 7256 1 4 148 0698 6630 3 A4R149 2100 3054 6 A4R150 0698 3459 8 A4R151 0757 0438 3 A4R152 0757 0280 3 A4R153 0698 7253 8 A4R154 0698 7196 8 A4R155 0698 7195 B A4R156 0698 7236 7 A4R157 A4R157 0698 6360 6 4 158 0698 6630 3 A4R159 R199 A4R200 0698 6631 4 A4R201 0698 6631 4 A4RT1 0837 0239 2 1 AATP1 1251 0600 0 AATP2 1251 0600 0 4 1251 0600 0 A4TP4 1251 0600 0 A4TP5 1251 0600 0 A4TP6 1251 0600 0 AATP7 1251 0600 0 4 1251 0600 0 A4TP9 1251 0600 0 A4TP10 1251 0600 0 AATP11 1251 0600 401 1826 0574 6 3 402 1826 0574 6 A4U3 1826 1491 8 3 404 1826 1097 0 4 405 1826 1491 8 3 A4UG 1826 0109 3 407 1826 0606 5 1 A4UB 1826 0109 3 409 1826 0606 5 1 A4U10 1826 0753 2 4011 1820 1197 9 4 4012 1825 0574 6 A4U13 1826 0109 3 4014 1826 0785 1 4015 1826 1491 8 3 tRefer to Section 7 for update information 16 Table 6 3 Replaceable Parts Description Mfr Code RESISTOR TRMR 200 10 SIDE ADJ 1 TRN 28480 RESISTOR 26 1K 1 05W F TC 0 100 24546 RESISTOR 20K 1 125W F 0 25 28480 RESISTOR 8 81K 1 05W 0 100 24546 RESISTOR 20K 1 125W 0 25 28480 RESISTOR TRMR 50K 10 SIDE ADJ 17 TRN 02111 RESISTOR 383K 1 125W 0 100 28480 RESISTOR 5 11 1 125W F TC 0 100 24546 RESISTOR 1K 1 125W F TC 0 100 24546
279. ceable Parts Description 08903 60300 SERIAL 2948A AND ABOVE CONTROLLEF COUNTER ASSEMBLY CAP FXD 0 01 100 V CAP FXD 0 01uF 100 V CAP FXD 0 01uF 100 V CAP FXD 0 01uF 100 V CAP FXD 0 01uF 100 V CAP FXD 0 01uF 100 V CAP FXD 0 01uF 100 V CAP FXD 0 01uF 100 V CAP FXD 0 01uF 100 V CAP FXD 0 01uF 100 V CAP FXD 0 010 100 V CAP FXD 0 01uF 100 V CAP FXD 0 01uF 100 V CAP FXD 0 01uF 100 V CAP FXD 0 01uF 100 V CAP FXD 0 01uF 100 V CAP FXD 0 01 100 V CAP FXD 0 010 100 V CAP FXD 0 01uF 100 V CAP FXD 0 010 100 V CAP FXD 0 01uF 100 V CAP FXD 0 01uF 100 V CAP FXD 1000pF 100 V CAP FXD 1000pF 100 V CAP FXD 10uF 35 V TA CAP FXD 0 1uF 50 V CAP FXD 15pF 2 200V CER COG CAP FXD 36pF 200 V CAP FXD 33uF 35 V TA CAP FXD 2 2uF 20 V TA CAP FXD 2 2uF 20 V TA CAP FXD 2 2uF 20 V TA CAP FXD 2 2uF 20 V TA CAP FXD 33uF 35 V TA CAP FXD 33uF 35 V TA CAP FXD 33uF 35 V TA CAP VAR 23 5pF 2 6pF 350 V AIR DIODE SWITCHING 1 150 50V 200MA 4NS DIODE SWITCHING 1N4150 50V 200MA 4 5 DIODE SWITCHING 1N4150 50V 200MA 4NS DIODE SWITCHING 1N4150 50V 200MA 4NS DIODE SWITCHING 1N4150 50V 200MA 4NS DIODE SWITCHING 1N4150 50V 200MA 4NS DIODE SWITCHING 1N4150 50V 200MA 4NS DIODE SWITCHING 1N4150 50V 200MA 4 5 Mfr Code 28480 09969 69969 09969 09969 09969 09959 09969 09969 09969 09969 09969 09969 09969 09969 09969 09969 09969 09969 09969 09969 09969 09969 09969 09969 56289 099
280. ch the filters The Gain 1 and Gain 2 resistors in the filters set the overall detector sensitivity by setting the gain of U17 Input Overload Detector The Input Overload Detector produces a low output that resets the Input Overload Flip Flop on the Latch Assembly and sets the input Attenuators to 40 dB see Service Sheets and 12 The low is produced if the output of the Input Range Detector exceeds 8V or if the output of the Differential to Single Ended Amplifier or the signal from the Input Attenuators goes more positive than 7 5V or more negative than 7 5V See Service Sheet 1 Comparators U4 018 are wire ORed in such a way that if any comparator senses an overload condition the INPUT OVLD line goes low R76 and C61 add delay to the circuit that prevents the recognition of short duration overloads R87 and C70 form a high frequency interference filter 8B 20 Model 8903 TROUBLESHOOTING SERVICE SHEET 2 TROUBLESHOOTING General Procedures for checking the Input Amplifier Assembly are given below The circuits or points to check are marked on the schematic diagram by a hexagon with a check mark and a number inside for example gt In addition any points outside the labeled circuit area that must be checked are also identified Fixed signals are shown on the schematic also inside a hexagon for example lt 1 9 TO 32 1 VDC gt Extend the board assembly where necessary to make measurements T
281. color coded board extractors For example assembly A6 has a black left extractor 8 2 Model 8903 Service d s 1 y r 5 a 311173 Ligure 4 1 Assemblies A2 and A9 Shown on Extender Boards and blue right extractor Thus the color code of is 06 Assembly Al is part of the front panel assembly of the instrument 8 14 Parts and Cable Locations The locations of individual components mounted on printed circuit boards or other assemblies are shown adjacent to the schematic diagram on the appropriate service sheet The part reference designator is the assembly designator plus the part designator For example A6R9 is R9 on the assembly For specific component descriptions and ordering information refer to Table 6 3 Replaceable Parts in Section 6 Chassis and frame parts as well as mechanical parts and cables are identified on Figures 6 1 through 6 5 In addition Service Sheets A and B in this section contain illustrated parts breakdowns that locate many mechanical parts and cables Major mechanical parts have reference designations that begin with the letters MP Other mechanical parts such as screws are listed in the replaceable parts list below the part to which thev fasten To find the part number and description of a mechanical part find the part in one of the figures in Section 6 or Section 8 The part in the figure will be labeled with its reference designator Look up that r
282. d Detector has tripped with the Output Amplifier gain at 0 dB See Service Sheet BD2 This error maps into a display of until Error 31 appears Error 75 DC Input Overload with Input Range Hold For a dc level measurement only the Input Overload Detector has been tripped while the input level range has been held with Special Function 2 N See Service Sheet BD2 This error maps into Error 30 Error 76 Too Much AC for DC Level Measurement For a dc level measurement the Input Overload Detector has tripped because of too much ac as sensed by the Input Range Detector This error maps into Error 14 or generates a normal range down Error 77 Output Amplifier Gain Too High after Leveling Once The Output RMS Average Quasi peak Detector has sensed too high a level after one attempt to set the Output Amplifier gain This would be normal for an unstable signal See Service Sheet This error maps into a display of until Error 31 appears 8 16 rev 20J UN87 Model 8903B Service Error 78 Output Amplifier Overioad after Leveling Once The Output Overload Detector has tripped after one attempt to set the Output Amplifier gain This would be normal for an unstable signal See Service Sheet BD3 This error maps into a display of until Error 31 appears Error 79 Output Amplifier Overload with No Post Notch Gain Hold The Output Overload Detector remains tripped after three attempts to set the Ou
283. d be a TTL low Pin 4 of U19A should be TTL high 75 Overload Detector Check 1 On the Audio Analyzer key in 41 0 SPCL to initialize the instrument Set the INPUT and OUTPUT switches to ground Key in AMPTD 4 V Key in 1 11 SPCL to set the input gain to 0 dB Key in 3 1 SPCL to set the output gain to 0 dB Connect the HIGH OUTPUT to the HIGH INPUT 2 Connect a high impedance dc coupled oscilloscope to the drain of Q7 The level should be a TTL high Hint Pin 13 of U19D should be between 15 2 and 14 7 Vdc 3 On the Audio Analyzer key in AMPTD 4 2 V The level should be a T TL low Hint Pin 13 of U19D should be between 0 and 200 mVdc 8B 48 rev 20J 01 87 8903 Service PRINCIPLES OF OPERATION SERVICE SHEET 7 SERVICE SHEET 7 A4 Output Amplifier Voltmeter Assembly Ripple Filters Voltmeter Input Selector and Voltage to Time Converter PRINCIPLES OF OPERATION General This portion of the Output Amplifier Voltmeter A4 contains the Voltmeter Input Selector the Voltage to Time Converter and several input ripple filters Ripple Filters Several of the dc inputs to the Voltage to Time Converter are filtered to remove ripple and noise This gives a smoother reading display The line from the Differential to Single Ended Amplifier see Service Sheet 1 from which dc level is read in the dc level measurement mode is filtered by the passive filter consisting of R118 C65 and C66 CR23 and CR24 are needed t
284. d type for example normal blow time delay etc Do not use repaired fuses or short circuited fuseholders Static Sensitive Devices This instrument was constructed in an ESD electro static discharge protected environment This is because most of the semi conductor devices used in this instrument are susceptible to damage by static discharge Depending on the magnitude of the charge device substrates can be punctured or destroyed by contact or mere proximity of a static charge The results can cause degradation of device performance early failure or immediate destruction These charges are generated in numerous ways such as simple contact separation of materials and normal motions of persons working with static sensitive devices When handling or servicing equipment containing static sensitive devices adequate precautions must be taken to prevent device damage or destruction Only those who are thoroughly familiar with industry accepted tech niques for handling static sensitive devices should attempt to service circultry with these devices In all instances measures must be taken to prevent static charge build up on work surfaces and persons handling the devices Model 8903B Replaceable Parts Section 6 REPLACEABLE PARTS 6 1 INTRODUCTION This section contains information for ordering parts Table 6 1 lists reference designations and Table 6 2 lists abbreviations used in the parts lis
285. e Permits the SINAD meter to be enabled for measurement modes other than SINAD and in the SINAD mode for measurements greater than 24 dB It is most often useful for reading distortion when the displayed reading is very noisy When this Special Function is invoked the meter reads the ratio of the level at the Pre Notch RMS Average Detector to the Output RMS Average Quasi peak Detector expressed in dB The reading must therefore be interpreted relative to the dB reading in the right display Usually this entails ignoring the minus sign and subtracting multiples of 20 dB For example a distortion reading of 66 80 dB in the right display may be indicated as 6 8 dB on the SINAD meter or 76 80 dB may be indicated as 16 8 dB AC level readings will normally be 0 dB N 0 SINAD meter enabled normally See Detailed Operating Instructions in Section 3 N 1 SINAD meter enabled in all measurement modes except level 46 N Count Internal Signals The Counter counts the internal signal selected by N and displays the count The resolution is the same as would normally be displayed N 0 Oscillator Frequency See Service Sheets 9 and 13 N 1 Input Frequency See Service Sheets 2 and 13 N 3 Output Amplifier Frequency See Service Sheets 5 and 13 Re nee ee cea 2 rev 20J UN87 8 11 Model 8903B 48 N Defeat Output Amplifier Overdrive Protection In the ac level and signal to noise me
286. e Low Output EDGE SENSITIVE INPUTS INPU AE EDGE SENSITIVE low to high inputs are indicated by the presence of the dynamic indicator symbol Low to High x Edge Sensitive INPUT EDGE SENSITIVE high to low inputs are indicated by the presence of both the dynamic indicator and the polarity in dicator symbols High to Low OUTPUT Edge Sensitive DELAYED OUTPUT RESPONSE oureut Tf OUTPUT DELAY indicator symbol 71 shows that the out ed Output Active High put becomes effective after the input signal returns to its 3 NUTN inactive state 1 Delayed Output OUTPUT Active Low Input INHIBIT INPUTS INHIBIT indicator symbol indicates an input that when active inhibits blocks the output s from achieving their active states the outputs remain inactive ANALOG LINES ANALOG indicator symbol 1 indicates a line that has an analog input or output ur HE NONLOGIC CONNECTION The Nonlogic Connection symbol X indicates a connec tion that does not carry any logic information 8 30 Model 8903 SCHEMATIC SYMBOLOGY AND SCHEMATIC DIAGRAM NOTES Table 8 6 Schematic Diagram Notes 11 of 11 AND OR followed by an identifying number In this example 1 is controlled by G1 ENABLE When the EN input is active the output is enabled to function normally When the EN input is inactive the three state output V in this case circuit b
287. e in upper case MULTIPLIERS Abbreviation Prefix Multiple T tera 1012 G giga 109 M mega 106 k kilo 109 da deka 10 d deci 10 1 centi 10 2 milli 10 3 10 6 n nano 1079 p pico 10 12 f femto 10715 a atto 10718 Model 8903B TD uses aria adc co rods time delay TERM ix terminal TET duree thin film transistor tines toggle THO cu Cn nse MESA os thread THRU through he o titanium TOL tolerance TRAIM es rna trimmer TOU PPP sa transistor TIL orkat transistor transistor logic AM S eau qu EE television TVI television interference TWT traveling wave tube Ua micro 1079 used in parts list UE microfarad used in parts list UHF ultrahigh frequency UNDEF undefined UNREG unregulated w wapus Dae RS volt MAC SS voltampere volts VAR variable voltage controlled oscillator o ea Ra URS volts dc VDCW volts dc working used in parts list oi voters volts filtered 555 variable frequency oscillator VHF very high frequency VDK volts peak Vp p volts peak to peak VIMS aas y volts rms VSWR voltage standing wave ratio VIO voltage tune oscillator vacuum tube voltmeter voits switched MURRAY watt with WIV working inverse vo
288. e is generally cleared when the error condition is removed The error messages are grouped by error code as follows Error 10 through Error 39 and Error 96 These are Operating and Entry Errors which indicate that not all conditions have been met to assure a calibrated measurement or that an invalid key sequence or keyboard entry has been made Operating Errors can usually be cleared by readjustment of the front panel controls The Error Disable Special Function 8 N can be used to selectively disable certain operating error messages Entry Errors require that a new keyboard entry or function selection be made More information on Operating and Entry Errors and error message disabling can be found under Error Message Summary and Error Disable in the Detailed Operating Instructions in Section 3 and on the Operating Information pull out cards Error 65 through Error 95 These are Service Errors which provide additional service related information and are discussed below 8 26 Service Errors Error 65 through Error 95 Service Errors are not normally displayed When a service related problem is suspected enable the Service Errors by keying in 43 1 SPCL Also a specific error message can be enabled by keying in 43 N where is the number of the desired error message 65 through 95 Service Errors can be disabled by keying in 43 0 SPCL or by pressing AUTOMATIC OPERATION Not all Service Errors are an indication of a problem but may be a normal occu
289. e upper left hand corner of the right display should blink rapidly The kHz and mV annunciators and the AC LEVEL and 80 kHz LOW PASS key lights should be on This indicates that the Controller is able to output to the front panel LED and display latches which are all operative rev 20J UN87 8A 7 Service Model 8903B If Indication Abnormal one or more LEDs or display segments fail check the respective components and drive circuits See Service Sheet 18 Also check the CPU I O port See Service Sheet BD4 Measurement Error Check Procedure Key in 43 1 SPCL This enables Service Errors Make the measurement in which the fault appears Normal Indications As the Special Function code is entered 43 1 should appear in the left display This indicates that the Controller responds to keyboard interrupts After pressing the SPCL key measurements should proceed as normal If Indication Abnormal If the keys have no effect check the keyboard interrupt See Service Sheet 17 If the keystrokes produce an erroneous display check the Keyboard See Service Sheet BD4 If the measurement is improper or error messages appear in the display consult the error messages tables see Error Messages in the Detailed Operating Instructions Section 3 and Error Messages paragraph 8 24 or consult the block diagram service sheet that documents the section of the instrument that appears to have the fault see Service Sheets BD2 through BD5 NOTE For problems that
290. ecomes a high impedance effectively removing that device from the TRANSMISSION CONTROL C1 When the controlied or gated input or output already has a functional label D is used here that iabe will be prefixed by the identifying number 1D G1 If the input or output is affected by more than one gate or control input G2 then the identifying numbers of each gate or control input will appear separated by commas ADDRESS broken letter The input that controls or gates other inputs is labeled with a C or a G The controlled or gated input or output is labeled with the same number When a V input is active the output will be in its active state With the V input inactive the device functions as if the V input doesn t exist When the X1 input is active the associated input output pair are bi directionally connected together When X1 is inactive the connection is When GA is active the active address line 0 through 3 is the decoded value of the 1 and 2 binary inputs When the controlled address lines have a functional value that value will be prefixed by the identifying Service 8 31 Model 8903B Service SERVICE SHEET BD1 Overall Block Diagram PRINCIPLES OF OPERATION General The Audio Analyzer can be conceptually broken down into four subsections subsections are shown in Table 8 1 Service Sheets BD2 through BD5 break the operation of the instrument along similar lines as indicated in the
291. ection 5 Replaceable Parts Mfr Part Number 4 1 8 0 6811 4 1 8 0 1962 4 1 8 0 1962 C4 1 8 T0 2202 G C4 1 8 TO 2202 G C4 1 8 TO 147 1 F C4 1 8 TO 147 1 C4 1 8 T0 1781 F 4 1 8 0 1781 0698 8869 0698 8869 C4 1 8 TO 511H F C4 1 8 TO 5 11R F 0698 4339 0698 4339 0698 8655 0698 8655 0698 6360 MF4C 1 8 TO 6191 F 4 1 8 0 3161 4 1 8 0 1001 0698 6360 0698 5630 0698 6360 0698 6360 0699 0594 0698 6630 1251 0600 1251 0600 1251 0600 1251 0500 1251 0600 1251 0600 1251 0600 1251 0600 1251 0600 1251 0600 1251 0600 1251 0600 1251 0600 1251 0500 1251 0600 LM201AL LM208AH LM208AH MC1595L XR5534ACN A Errata part change 6 33 Replaceable Parts Reference HP Part Qiy Designation Number D A3U6 1826 0662 3 4 A3U7 1826 0109 3 4 A3UB 1826 0412 1 1 A3U9 08903 80041 1 A3U10 1826 0138 B 10 A3U11 1826 0783 9 A3U12 1826 0783 9 A3U13 1826 0662 3 3014 1826 0138 8 A3U15 1826 0138 8 A3U16 1826 0138 8 A3U17 1826 0421 2 A3U18 1826 1796 6 A3U19 1826 0740 8 1 Refer to Section 7 foy update information 6 34 Table 6 3 Replaceable Parts Description Mir Code IC OP AMP LOW BIAS H IMPD TO 99 PKG 28480 IC OP AMP WB 99 34371 IC COMPARATOR PRCN DUAL 8 DIP P PKG 27014 IC LIN SPECIAL 28480 COMPARATOR GP QUAD 14 DIP P PKG 01295 IC OP AMP LOW NOISE 8 DIP C PKG 52063 IC OP AMP LOW NOISE 8 DIP C PKG 52063 IC OP AMP LOW BIAS H IMPD TO 99 PKG
292. ector 403 5 7 40 1 02 TOP VIEW Schematic General Information RMS AVG ZERO RMS 2 METER DC SCALE SCALE TP2 ADJUST ADJUST TP3 TP1 4 TPS CALISAATION TPS CALIBRATION 2 2 2 2 2 2 MPi BLACK Q u E E oO vlr sr D mI cr lac C OD nuo T dm C oc an Ce CIB C18 C26 gt C3 SERES S FE a amp amp a ceo ES Ja gt Cal 0 1 F1 Ln Fn a ar a xl R81 C26 C34 4 C25 C68 e m m gt Lr cc Ree ug R23 H2 sole n e llo ha lt ty aud Fa d c m eJ o p gt r oc gt m 5 lt m tr 1 e rr 1 rn Alo E co 3 lt SERE 1 li 5 D BC E rm gt 1 e O 5 m gt Ie L 4 i cu o 1 co coc LO i juo BD d I s e c 000000 mim SON EN A s gm em n1 2 911 91 m 9117 118 Ue ee 1 1 15 R18 C17 C65 C66 C51 C70 LO No 12 C R17 n T gt co a m m an i L1 L2 016 eso R12 R13 C14 U10 C50 EE T a C64 U17 C1 2
293. ed If faulty see Service Sheet 3 and check Sum Amplifiers 1 and 2 and Integrators 1 and 2 8 On the Audio Analyzer key in 53 2 SPCL Key in the frequencies listed in Table 8B 11 For each setting key in the pair of Special Functions indicated After keying in the first member of the pair of Special Functions press RATIO twice to establish a new ratio reference After keying in the second Special Function the amplitude read 8B 10 rev 20J UN87 Model 8903B Service Table 8B 10 Amplitude Limits on Display 72 Step 7 Special Frequency Function Minimum Maximum 98 7 49 4 197 781 390 1 560 6 250 3 130 12 500 50 000 25 000 100 000 Table 8B 11 Amplitude Limits on Display 72 Step 8 Source Amplitude Amplitude Limits Amplitude Limits Frequency Special functions Minimum Maximum 54 128 54 127 54 64 54 63 54 32 54 31 54 16 54 15 54 8 54 7 54 4 54 3 54 2 54 1 on the Audio Analyzer s display should be within the limits shown If faulty see Service Sheet 3 and check Sum Amplifiers 1 and 2 and Integrators 1 and 2 9 On the Audio Analyzer key in FREQ 1 kHz 53 1 SPCL and 54 147 SPCL Connect the oscilloscope to A3TP2 NOTCH and set it for absolute vertical calibration The waveform should be a heavily clipped sine wave with an amplitude between 20 and 25 Vpp If faulty see Service Shee
294. eference designator in the Replaceable Parts table If the part is a fastener such as a screw nut or washer look to the figure for the part to which it fastens Then look up the fastened part in the parts list Just below it are the part numbers and description of the desired hardware rev I4SEPS 8 3 Service 8903B HP 5020 8160 UNGAR PL 111 SOLDER TIP MODIFIED AS SHOWN Ts n 0 3180 0 1250 DIMENSIONS IN CM IN Figure 6 2 Heat Staking Tip 8 15 Other Service Documents Service Notes Manual Updates and other service literature are available through Hewlett Packard For further information contact your nearest Hewlett Packard office 8 15 1 Component Replacement Procedures The A2AI Options 010 011 012 013 015 2 2 Options 050 051 052 053 055 4 5 A7 9 A10 All A12 and AI3 printed circuit board assemblies are manufactured using a Hot Air Leveled HAL process The printed circuit board traces pads and plated through holes PTH are copper While the process has several advantages over conventional processes the printed circuit boards are more susceptible to broken traces lifted pads and damage to the plated through holes Therefore additional care must be taken when replacing components on HAL printed circuit boards Listed below are soldering considerations that applv to all printed circuit boards e The temperature of the soldering iron tip and the t
295. en 2 7 and 3 3 Vpp Hint The control signals are as shown in Table 8B 25 Table 88 25 Levels at 409 lt Z Step 4 Hint LOW PASS Level TTL at U9 Pin FILTER On 80 kHz 30 kHz None 5 On the Audio Analyzer key in the SOURCE frequency and LOW PASS FILTER listed below For each setting the waveform should be within the limits indicated in Table 8 26 8B 40 Model 8903 Service TROUBLESHOOTING SERVICE SHEET 5 Table 8B 26 Limits at AATP6 C71 Step 5 SOURCE LOW PASS Level at Frequency kHz FILTER A4TP6 Vpp 100 None 2 5 to 3 3 80 80 kHz 1 7 to 2 6 30 30 kHz 1 7 to 2 6 Hint See the hint for step 4 6 On the Audio Analyzer key in FREQ 1 kHz Set LP FILTER to 80 kHz Reduce the SOURCE amplitude for a waveform amplitude of 1 2 Vpp 7 Connect the oscilloscope to A4TP5 3 The waveform should be between 11 5 and 12 5 Hint Pin 9 of U7 should be a TTL low Pin I of U7 should be a TTL high Amplifier 3 should have a gain of 10 8 the Audio Analyzer key 3 1 SPCL waveform should be between 110 and 130 mVpp Hint Pin 9 of U7 should be a TTL high Pin 1 of U7 should be a TTL low 9 Connect the oscilloscope to A4TP4 4 The waveform should be between 110 and 130 mVpp Hint Pin 8 of U7 should be a TTL high Pin 16 of U7 should be a TTL low The Buffer U14B and High Pass Filters should each have a gain of 1 Amplifier 4 should have a gain of 10 10
296. equency of the signal counted at the input When measuring SINAD the Controller sets it to the programed frequency of the internal oscillator notch filter frequency response is obtained by passing the signal through a unity gain inverting active bandpass filter then summing the filter s output with its input At the center frequency of the bandpass filter the two signals into the Sum and Output Amplifier nearly cancel This results in significant rejection of the signal at that frequency Since the notch is very narrow only the fundamental is rejected while noise and harmonic components are passed The Balance and Fine Tune control circuit uses negative feedback to fine tune the bandpass filter to the signal and to fine adjust balance its gain to maximize the depth of the notch The tuning range of the fine tune control is 895 of the nominal center frequency Feedback for the Balance and Fine Tune Control circuit comes from Amplifier 1 which follows the Notch Filter The tuning error is also measured by the DC Voltmeter which is monitored by the Controller If a large error exists the Controller takes steps to either retune the Notch Filter or display an error message In the other measurement modes the bandpass filter is not switched in and a flat response results Output Circuits The output from the Notch Filter is attenuated amplified and filtered to condition the signal for the most accurate measurement by the Voltmeter The sign
297. er When Gain Switch Q2 is off the Tune Chopper s path resistance is R49 in series with R54 the Inverting Amplifier s path resistance is R60 When Q2 is switched on the current in both paths increases by about a factor of ten R55 is now in parallel with R54 and R58 with R60 This increases the Tune Integrator gain by a factor of ten and compensates for a 20 dB reduction in attenuation when Attenuator is switched out see Service Sheet 5 The action of the Balance Chopper is similar to the Tune Chopper Integrators and Multipliers The sum current from the Tune Chopper and Inverting Amplifier is integrated by the Tune Integrator The value of the sum current represents the tuning error of the Notch Filter The integrator amplifies and filters the error current and drives the Tune Multiplier The integration capacitors are switched for different frequency ranges to compensate for the resultant gain change with frequency When the Notch Filter range is changed FET Q1 is momentarily switched on to discharge the integration capacitor and speed up the tuning correction Operation of the Balance Integrator is similar to the Tune Integrator The tune and balance offset adjustments R62 and R63 compensate for dc offsets in the filter to maximize the depth of the notch The Tune Multiplier receives dc control input the Y input from the Tune Integrator and an ac input the X input from Integrator 1 see Service Sheet 3 The sensitivity of the X
298. ervice sheets Included with the block diagrams are troubleshooting checks and discussions of the principles of operation 8 4 Schematics Service Sheets through 21 consist of assembly schematic diagrams principles of operation discussions com ponent locator drawings troubleshooting checks and hints and when necessary mnemonic tables 8 5 Additional Service Sheets Service Sheets A and B contain disassembly procedures and exploded views of the front and rear panel assem blies Service Sheet C contains a summary of Service Special Functions and Error Messages 8 6 SAFETY CONSIDERATIONS 8 7 Before Applying Power Verify that the instrument is set to match the available line voltage and that the correct fuse is installed An uninterrupted safety earth ground must be provided from the main power source to the instrument input wiring terminals power cord or supplied power cord set In addition verify that a common ground exists between the Audio Analyzer and all test equipment 8 8 Safety Pay attention to WARNINGS and CAUTIONS They must be followed for your protection and to avoid damage to the equipment Service Model 8903B Maintenance described herein is performed with power supplied to the instrument and with the protective covers removed Such maintenance should be performed only by service trained personnel who are aware of the hazards involved for example fire and electrical shock Where maintenance can be perf
299. f not correctly performed or adhered to could result in damage to or destruction of part or all of the product Do not proceed beyond a CAUTION sign until the indicated conditions are fully understood and met Any interruption of the protective grounding conductor inside or outside the instrument or disconnecting the protective earth terminal will cause a potential shock hazard that could result ing personal injury Grounding one conductor of a two conductor outlet is not sufficient protection Whenever it is likely that the protection has been impaired the instrument must be made inop erative and be secured against any unintended operation If this instrument is to be energized via an autotransformer for voltage reduction make sure the common terminal is connected to the earth terminal of the power source Servicing instructions are for use by service trained personnel only To avoid dangerous elec tric shock do not perform any servicing unless qualified to do so Adjustments described in the manual are per formed with power supplied to the instrument while protective covers are removed Energy avail able at may points may if contacted result in personal injury Capacitors inside the instrument may still be charged even if the instrument has been discon nected from its source os supply For continued protection against fire hazard re place the line fuse s only with 250V fuse s of the same current rating an
300. fails In general however it is also a good practice to perform the troubleshooting checks on Service Sheet BD since they take only a few minutes and reveal much information 8 19 Catastrophic Failures Begin troubleshooting catastrophic failures by performing the troubleshooting checks on Service Sheet BDI The simple procedures there take only a few minutes and will quickly differentiate a control digital problem from a hardware analog problem The checks then give cross references to the detailed block diagrams Service Sheets BD2 to BD5 or to a schematic The troubleshooting information found on all service sheets consists of a series of performance checks The purpose of the checks is not to identify which circuit or component has failed but rather to verify whether or not the assembly or circuit is operating correctly Information on the possible cause of failure is given in the form of hints whenever they can be given reliably The limits given in the troubleshooting checks are rather 8 4 1 Model 8903 9 A7 A5 A3 A11 Reference Designator Assembly Keyboard and Display Input Amplifier Notch Filter Output Amplifier Voltmeter Oscillator Qutput Attenuator Latch Controller Counter Remote Interface Remote Interface Connector Series Regulator Socket Connector Filter Power Supply and Mother Board Line Power Module Figure 8 3 Assembly Locations Service A10 8 A6 A4
301. ff switch to analog or binary signals flowing in both directions Dependency notation should be used to indicate affecting affected inputs and outputs Note amplifier symbol with depen dency notation should be read to indicate unilateral switching Coder Input code X is converted to output code Y per weighted values or a table The following labels are to be used as necessary to ensure rapid identification of device function Multiplexer The output is dependent only on the selected input Demultiplexer Only the selected output is a function of the input Central Processing Unit 8 25 Service Model 8903B SCHEMATIC SYMBOLOGY AND SCHEMATIC DIAGRAM NOTES Table 8 6 Schematic Diagram Notes 6 of 11 DIGITAL SYMBOLOGY REFERENCE INFORMATION Sequential Logic Functions Monostable Single shot multivibrator Output becomes active when the be comes active Output remains active even if the input becomes inactive for a period of time that is characteristic of the device and or circuit G Oscillator The output is a uniform repetitive signal which alternates between the JUUL high and low state values If an input is shown then the output will be active if an only if the input is in the active state FF Flip Fiop Binary element with two stable states set and reset When the flip flop is set its outputs will be in their active states When the flip flop is reset its outputs will be in their inactive sta
302. g input The output of U20 is inverted by FET Q8 The Counter now begins clocking the duration of the ramp When the ramp reaches the voltage at the non inverting input the output of U20 goes low and via Q8 inhibits the clocking of the Counter R131 and R136 add a small amount of hysteresis to the Comparator to assure a complete and rapid transition of the output once it begins to change 8 49 Service Model 8903B PRINCIPLES OF OPERATION SERVICE SHEET 7 CIEE N E TE C MC EN V EMEN OR E EI Ee DE GM CU NU E C CC ON CT 2222 MA LN ET CENE E EM UNS M ME CURE SIT IE NER UD Since the ramp begins at a negative offset each voltage measurement consists of clocking the duration of a pair of ramps The first ramp is generated with the Voltmeter Input Selector set to the grounded input input 0 The duration of this ramp is proportional to the offset The second ramp is generated with the selector set to the input to be measured The duration of this ramp is proportional to the input level plus the offset The difference in duration is computed by the Controller and is proportional to the input voltages The large negative offset voltage permits the DC Voltmeter to measure both negative and positive voltages 8 50 Model 8903 Service TROUBLESHOOTING SERVICE SHEET 7 TROUBLESHOOTING General Procedures for checking the Output Amplifier Voltmeter Assembly
303. ge to Time Converter This can occur if the input to the Voltage to Time Converter is too negative See Service Sheet BD2 This error is identical to Error 17 Error 86 Frequency Count Greater Than 200 kHz This error causes a display of 0 000 kHz Error 87 Output Amplifier Overload with Post Notch Gain Hold The Output Overload Detector remains tripped after three attempts to set the Output Amplifier gain and Special Function 3 N has been selected See Service Sheet BD2 This error maps into Error 19 Error 88 Attempt to Take Log of Negative Ratio This error maps into Error 11 Error 89 Attempt to Take Log of Negative Number This error maps into Error 11 Error 90 Decimal Point Fixed and Exponent Too Large One of the mV ranges has been requested by Special Function 4 N for a measurement that does not use those ranges This error maps into Error 10 Error 91 Decimal Point Fixed Too Far to the Left The decimal point has been held by Special Function 4 N and the reading to be displayed is too large to fit the display This error maps into Error 10 Error 92 Decimal Point Fixed and Unable to Display T his error maps into Error 10 Error 93 Number to Be Displayed Greater Than 9999 This error maps into Error 10 Error 94 Attempt to Divide by Zero in Ratio This error maps into Error 11 Error 95 Signal to Noise Ratio Too Large to Calculate This error maps into Error 10 rev 20J UN87 8 17 Service Mode 8903B POWER UP CHECKS 8 27
304. gram Rs and Cs in Integrators 1 and 2 This is done by the Controller Coarse tuning accuracy is about 8 Special Functions 53 and 54 can be used to manually set the tuning of the Notch Filter The damping factor o is fixed and is approximately equal to 0 15 Thus the low and high pass filters are underdamped To improve the depth of the notch the phase and level of the output of the Notch Filter are sensed The phase and level error voltages then correct the tuning and balance by controlling the amount of signal of the appropriate magnitude and phase injected into Sum Amplifier 2 The amplifier is not depicted in Figure 8B 1 It is a summing amplifier inserted before Integrator 2 Operation of the fine tune and balance circuit is independent of the Controller Figure 8B 2 shows the essential parts of the phase and level sensing circuits and the associated waveforms The input to the circuit comes from the output of the Notch Filter after being amplified by the combination 8B 2 rev 20J UN87 Model 8903B Service of Attenuator 1 and Amplifier 1 of the Output Amplifier Voltmeter Assembly 4 and the Notch Amplifier The total gain is either 5 5 or 55 depending on the setting of Attenuator 1 The input be considered as having components in phase with the input to the Notch Filter and in quadrature that is 90 out of phase with it The waveform for in Figure 8B 2 is shown as being totally in ph
305. gure 88 19 A Weighting Filter UI Pin 7 UI Pin 14 V 5 a gt e lt lt lt 20 100 1k 10k 20k 20 100 1k 10k 20k FREQUENCY Hz FREQUENCY Hz Figure 8B 20 Weighting Filter Figure 88 21 A Weighting Filter UI Pin 8 A2TP3 lt 9 D e 2 2 z z e lt lt 2 2 20 100 1k 10k 20k FREQUENCY Hz FREQUENCY Hz Figure 8B 22 Weighting Filter Figure 8B 23 CCIR Weighting Filter UI Pin 1 Ul Pin 7 8 28 Model 8903B MAGNITUDE 48 MAGNITUDE dB MAGNITUDE dB Service TROUBLESHOOTING SERVICE SHEETS 2A AND 2B 10k 20k FREQUENCY Hz ligure 88 24 CCIR Weighting Filter Ul Pin 14 10k 20k FREQUENCY Hz Figure 8138 26 CCIR Weighting Filter A2TP3 10k 20k FREQUENCY Hz Figure 6B 28 CCIR ARM Weighting Filter UI Pin 7 MAGNITUDE dB 10k 20k FREQUENCY Hz Figure 68 25 CCIR Weighting Filter UI Pin 8 MAGNITUDE dB 10k 20k FREQUENCY Hz igure 88 27 CCIR ARM Weighting Filter 1 MAGNITUDE dB 10k 20k FREQUENCY Hz ligure 88 29 CCIR ARM Weighting Filter UI Pin 14 8 29 Service Model 8903B TROUBLESHOOTING SERVICE SHEETS 2A AND 2B MAGNITUDE dB MAGNITUDE 48
306. h Q21 but not Q22 through 029 8 On the Audio Analyzer key in FREQ kHz 53 1 SPCL and 54 147 SPCL Connect the oscilloscope to A3TP7 OUT 8B 32 Model 8903B Service TROUBLESHOOTING SERVICE SHEET 3 Table 8B 20 Voltage at A3TP5 6 7 and 14 Step 6 SOURCE Voltage Limits Vpp at Special Frequency Functions Hz 5 A3TP6 A3TP7 A3TP14 53 1 and 54 147 4 8 to 7 2 4 8 to 7 2 1 2 4 8 to 7 2 0 3 to 0 5 1 6 to 2 4 4 8 to 7 2 0 1 Q 3 to 0 5 0 1 4 8 to 7 2 1 6 to 2 4 53 0 4 8 to 7 2 4 8 to 7 2 1 2 4 8 to 7 2 53 2 4 8 to 7 2 4 8 to 7 2 lt 1 2 4 8 to 7 2 4 8 to 7 2 lt 1 2 4 8 to 7 2 53 3 and 54 108 4 8 to 7 2 Table 8B 21 Voltage at A3U16 CZD Step 6 Hint Level Level Vdc 016 Pin 016 Pin Special FETs On 5 0 15 Q30 Q33 19 15 032 035 5 19 15 Table 8 22 Levels at A3Q14 through 3029 lt Z gt Step 7 SOURCE Level Vdc at U14 Pin Level Vdc at U15 Pin Special FETs On Function Frequency Hz Q21 Q29 Q20 Q28 Q19 Q27 Q18 Q26 Q17 Q25 Q16 Q24 Q15 Q23 Q14 Q22 All 9 On the Audio Analyzer key in the Special Functions listed in Table 8B 23 For each setting the peak to peak amplitude observed on the oscilloscope should be within the limits indicated If the signal is faulty also check the control signals indicated 10
307. he amount indicated The peak to peak amplitude displayed on the oscilloscope should be within the limits indicated If the signal level is incorrect also check the control signals indicated 5 Disconnect the HIGH INPUT Set the oscilloscope to measure dc voltage The voltage should be between 0 1 and 40 1 Vdc Hint If the dc voltage is only slightly out of limits perform the Input DC Offset Adjustment paragraph 5 10 6 Connect the HIGH OUTPUT to the LOW INPUT Set the oscilloscope back to the x gain that begins step 4 Repeat step 4 The results should be the same REM E o MCA DM AERIS IU DEED CMM CM MEC EE EE CELL RCM E E MEM EMEDVECK n EC MM COMMENCER MEUM UH EUER EC UON 8B 18 Mode 8903 TROUBLESHOOTING SERVICE SHEET 1 Table B 14 Amplitude at 2 5 C Z3 gt Step 4 Level TTL at U15B Pin increase in Oscilloscope Vertical Gain Amplitude Limits div pp 1 9 to 2 1 4 7 to 5 8 1 2 to 1 3 1 8 to 2 1 Special Function Service 7 Using a tee adapter connect the HIGH OUTPUT to the HIGH and LOW INPUTS in parallel Key in AMPTD 1 The waveform on the oscilloscope should have an amplitude less than 50 mVpp The waveform may be non sinusoidal Hint If the signal is only slightly out of limits perform the Common Mode Rejection Adjustment paragraph 5 9 8B 19 Service Model 8903B PRINCIPLES OF OPERATION SERVICE SHEET 2 SERVICE
308. he hardware of the instrument Many circuits are used by the Controller for different functions at different times Thus a specific failure in one circuit can show up as a collection of symptoms that superficially seem unrelated The appearance of several symptoms can often be used to advantage as they provide many avenues to pursue when tracking down a problem A clear line is drawn between Service Special Functions and normal instrument operation When most Service Special Functions are used normal instrument functions are suspended When the Service Special Function mode is left to resume normal measurements all effects of the Service Special Function on hardware are lost As an example a Service Special Function can be used to display the oscillator frequency But once normal measurements are resumed the display will revert back to what it was before the Service Special Function was invoked Power Supplies The instrument is run from four regulated supplies 15V 15V 12V and 5V All supplies are independent except the 5V supply which is dependent on the 15V and 15V supplies rev 20J UN87 8A 5 Service Model 8903B TROUBLESHOOTING SERVICE SHEET BD1 INTERRUPT NOTES CHANGE IMITIALIZE USATE SNAM 1 The SOURCE RELATED KEY SCAN block monitors the FREQ FREQ INCR AMPTD AMPTD INCR t step up and Y step down SOURCE keys RELATED KEY SCAN 2 On errors the instrument exits the current AR b
309. hese procedures assume that the source is working properly Equipment Oscilloscope cvv pay a b o Eats HP 1740A lt 71 gt Programmable Gain Amplifier Check 1 On the Audio Analyzer key in 41 0 SPCL to initialize the instrument Set the INPUT and OUTPUT switches to ground Key in AMPTD 1 V Key in 1 11 SPCL to set the input gain to 0 dB Connect the HIGH OUTPUT to the HIGH INPUT 2 Connect high impedance ac coupled oscilloscope to 2 5 SING END The waveform should be 2 7 to 2 9 Vpp The period of the signal should be approximately ms Hint If the signal is faulty see Service Sheet and check the Differential to Single Ended Amplifier 3 Use the oscilloscope s vertical gain controls to adjust the waveform amplitude for 2 divisions peak to peak 4 Connect the oscilloscope to A2TP4 PGM AMP On the Audio Analyzer key in the Special Functions listed in Table 8B 16 For each setting the peak to peak amplitude should be within the limits indicated If the signal level is incorrect also check the control signals indicated Checking UI will require unplugging the leftmost plug on filter A2AI or probing from the circuit side of A2 Table 8B 16 Amplitude Limits at A2TP4 lt Z gt Step 4 dB 0 4 8 12 FN Amplitude Special Limits Function div pp s s a a 1 9 to 2 1 3 0 to 3 3 4 7 to 5 3 7 6 to 8 4 lt 2 gt Weighting Bandpass and High Pass Filters Check On the Audio
310. iations 1 of 2 ABBREVIATIONS COEF Levi x coetficient EDP electronic data COM tai common processing COMP composition ELECT veces n electrolytic COMPL complete ENCAP encapsulated CONN connector EXT yta ees external CP TRIP cadmium plate Bo ree ore farad GRY saree ears cathode ray tube FET field effect transistor OT or osi complementary flip flop transistor logic flat head continuous wave 22255425 fillister head DW clockwise FM frequency modulation oases ace cs centimeter ouv ke ex s front panel DIA ose digital to analog FHEQ J o oa in frequency dB Sum decibel FXD fixed dBm decibel referred Vaaa waqu q suwas gram to 1 mW GE germanium 06 direct current GAZ gigahertz deg degree temperature GL glass interval or difference GRD ground ed degree plane henry angle oy Za s usse atio Deae hour degree Celsius HET 542270 heterodyne centigrade HEX ise per us hexagonal degree Fahrenheit HD Su oos tae Eee head degree Kelvin HDW uus hardware DEPC deposited carbon rovs high frequency DET EXE detector HG 55 Musso diam diameter HE usce v da E high DIA diameter used in HP iuo Hewlett Packard parts list HPF high pas
311. ical gain controls to adjust the diplay amplitude for 4 division peak deflections of the dc signal Hint Set the ground to the center of the display Set sweep time to 1 sec div Hint See the hint for step 6 12 On the Audio Analyzer press S Shift SIG NOISE The waveform should be as shown in Figure 8B 33 1 Note rise and fall times v2 Full Wave Rectifier Check 1 On the Audio Analyzer key in 41 0 SPCL to initialize the instrument Set the INPUT and OUTPUT switches to ground Key in AMPTD 3 V Key in 1 11 SPCL to set the input gain to 0 dB Key in 3 1 SPCL to set the output gain to 0 dB Connect the HIGH OUTPUT to the HIGH INPUT 2 Connect a high impedance dc coupled oscilloscope to A4TP4 AMP 4 On the Audio Analyzer fine adjust the SOURCE amplitude for 8 5 Vpp on the oscilloscope Hint The amplitude at A4TP4 before adjustment should be approximately 8 5 Vpp If the signal is faulty see Service Sheet 5 and check the Output Amplifier circuitry 3 Connect the oscilloscope to pin 6 of U5 The waveform should be as shown in Figure 8B 34 Note Excessive input capacitance of the oscilloscope may cause oscillation Use a divide by ten probe 4 Connect the oscilloscope to A4TP11 RECT The waveform should be a negative full wave rectified sine wave with a peak amplitude between 4 5 and 4 0V 8B 46 rev 20JU N87 Model 8903 Service Figure 8B 34 Waveform at Pin 6 of U5 72 Step 3 Log Amplifier and Filter A
312. icates a Schottky hot carrier diode Light emitting diode T Indicates a voltage regulation diode Multiple transistors a single package physical location of the pins is shown in package outline on schematic Je Identification of logic families as shown in this case ECL 8 23 Service Model 8903B SCHEMATIC SYMBOLOGY AND SCHEMATIC DIAGRAM NOTES Table 8 6 Schematic Diagram Notes 4 of 11 DIGITAL SYMBOLOGY REFERENCE INFORMATION Input and Output Indicators Implied Indicator Absence of polarity indicator see below implies that the active state is a relative high voltage level Absence of negation indicator see below im plies that the active state is a relative high voltage level at the input or output zi F Polarity Indicator The active state is a relatively low voltage level Dynamic Indicator The active state is a transition from a relative low to a relative high voltage level Inhibit Input Input that when active inhibits biocks the active state outputs of a digital device Analog that is a continuous signal function e g a sine wave Polarity Indicator used with Inhibit Indicator indicates that the relatively low level signal inhibits blocks the active state outputs of a digital device Output Delay Binary output changes state only after the referenced input m 1 turns to its inactive state m should be replaced by a
313. ich is backward compatible See Service Sheet 15 and 16 for ROM identification Software date code 11 15 1984 2450A to 2520A 1 ROM part numbers ROM 1 08903 80016 ROM 2 08903 80017 ROM 3 08903 80018 ROM 4 08903 80019 ROM 5 08903 80020 ROM 6 08903 80021 ROM 7 08903 80022 ROM 8 08903 80023 ROM 9 08903 80024 rev 15APR89 7 1 Instrument Changes Model 8903B 2 Software date code 2 11 1985 2520A to 2614A ROM part numbers ROM 1 1818 3741 ROM 2 1818 3742 ROM 3 1818 3743 ROM 4 1818 3744 ROM 5 1818 3745 ROM 6 1818 3746 ROM 7 1818 3747 ROM 8 1818 3748 ROM 9 1818 3749 3 Software date code 8 22 1986 2652A to 2818A The instrument has undergone a change in firmware ROM memory has been consolidated into 1 single ROM ROM 10 U31 ROM part number ROM 10 08903 80036 4 Software date code 2829 2836A and above The 08903 80050 is now capable of being programmed to 17 78 dBm 6 0 volts in the log mode The previous ROM 08903 80036 could not be programmed above 15 56 dBm 4 64 volts in the log mode ROM part number 10 08903 80050 7 4 HARDWARE CHANGE SUMMARY 1 2730A and above A quasi peak detector is added to the Output RMS AVG detector on the A4 Voltmeter assembly The part number for the new A4 assembly is 08903 60183 2 2742 and above The selectable 6000 or 500 Source Output Impedance is now enabled from the front panel as a gpecial function and is programmable over HP I
314. ilogging function R143 and R144 are installed whenever the offset adjustment R85 has insufficient range CR13 and CR16 protect the log and antilog transistors should offset voltages of opposite polarity be applied to them CR14 provides an offset voltage in the collector of Q1B that matches the offset created by the base emitter junction of Q2A in the collector of Q1A R93 and R95 improve the response characteristics of the circuit to low frequency inputs while at the same time allow the circuit to respond rapidly to changes in input level R91 permits fine adjustment of the gain of the circuit R94 and C56 also form the first real pole in the Ripple Filter see Service Sheet 7 In the quasi peak converter mode full wave rectification of the input signal is performed by 05 with current summing via R202 and R203 The quasi peak converter consists of two peak detector stages in series Stage 1 which consists of U26 U27A Buffer and associated components is an inverting positive peak detector which has a charge rate of lt 2 ms determined by R202 and C1 and a discharge rate of approximately 400 ms R205 C1 Stage 2 which consists of U28 U27B Buffer and associated components is an inverting negative peak detector which has a charge rate of approximately 200 ms determined by R208 and C2 and a discharge rate of approximately 600 ms R210 C2 rev 20J UN87 8B 43 Service Model 8903B SINAD Meter Circuits The SINAD meter displays the
315. information rev 1GFE B90 Table 6 3 Replaceable Parts Description FUSE 1 5 250V TD 1 25X 25 UL FOR 115V OPERATION FUSE 75A 230V TD 1 25X 25 UL FOR 230V OPERATION FUSE 1 5A 250V 1 25 25 UL FOR 115V OPERATION FUSE 1A 250V NTD 1 25X 25 UL FOR 230V OPERATION CONNECTOR OUTPUT HIGH NSR Wt EXCEPT OPTION 001 CONNECTOR OUTPUT LOW NSR P O W1 EXCEPT OPTION 001 SINDING POST ASSY SGL THO STUD WASHER LK INTL T 1 4 IN 256 IN ID Replaceable Parts Mtr Mfr Part Number Code 71400 1 1 2 28480 2110 0360 28480 2110 0043 75015 312001 28480 1510 0038 28480 2190 0077 NUT HEX DBL CHAM 1 4 32 THD 094 IN THK 00009 ORDER BY DESCRIPTION CONNECTOR INPUT HIGH NSR P O We EXCEPT OPTION 001 CONNECTOR INPUT LOW NSR P O We EXCEPT OPTION 001 BINDING POST ASSY SGL THD STUD 28480 1510 0938 WASHER LK INTL T 1 4 IN 2564N 1D 28480 2199 0077 NUT HEX DBL CHAM 1 4 32 THD 094 IN THK 00000 ORDER BY DESCRIPTIO CONNECTOR OUTPUT HIGH NSR P O W3 EXCEPT OPTION 001 CONNECTOR OUTPUT LOW NSR P O W3 EXCEPT OPTION 001 CONNECTOR INPUT HIGH NSR P O Wa EXCEPT OPTION 001 CONNECTOR INPUT LOW NSR P O Wa EXCEPT OPTION 001 METER 1 LESS THAN 500 OHMS 1 75 X 20490 1120 0694 SPACER RND 2 IN LG 12 IN ID 25 IN OD 00000 ORDER BY DESCRIPTION NUT HEX W LKWR 4 40 THD 094 IN THK 00000 ORDER RY DESCRIFTICHN TERMINAL SLOR LUG LK MIG FOR 10 28 180 2650 0093 NUT HEX D
316. information rev 20JUN91 Table 6 3 Replaceable Parts Description DIODE SWITCHING 80V 200 2NS DO 35 DIODE GEN PRP 125MA DO 35 DIODE GEN PRP 125MA DO 35 DIODE GEN PRP 125MA DO 35 DIODE GEN PRP 125MA DO 35 DIODE GEN PRP 125MA DO 35 DIODE GEN PRP 125MA DO 35 DIODE GEN PRP 125MA DO 35 DIODE GEN PRP 125MA DO 35 DIODE SWITCHING 30V 50MA 2NS DO 35 DIODE GEN PRP 125MA DO 35 DIODE SWITCHING 80V 200MA 2NS DO 35 DIODE SWITCHING 80V 200MA 2NS DO 35 DIODE GEN 125 35 DIODE GEN PRP 125MA DO 35 DIODE GEN PRP 125MA DO 35 DIODE GEN PRP 125MA DO 35 DIODE SWITCHING 80V 200MA2NS 00 35 DIODE GEN PRP 125MA DO 35 RELAY REED 1C 250MA 28VDC 5VDC COIL 3VA INDUCTOR RF CH MLD 100UH 5 166DX 385LG INDUCTOR RF CH MLD 100UH 5 166DX 385LG INDUCTOR MISC ITEM INDUCTOR MISC ITEM INDUCTOR MISC ITEM EXTR PC BD BLK POLYC 062 BD THKNS PIN GRV 062 IN DIA 25 IN LG STL EXTR PC BD YEL POLYC 062 BD THKNS PIN GRV 062 IN DIA 25 IN LG STL PLUG HOLE BDR HD FOR 187 D HOLE NYL TRANSISTOR DUAL NPN TO 71 500MW THERMAL LINK DUAL TO 18 CS TRANSISTOR DUAL NPN TO 71 PD SOOMW THERMAL LINK DUAL TO 18 CS TRANSISTOR J FET 2N4391 N CHAN D MODE TRANSISTOR DUAL NPN PD 500MW TRANSISTOR J FET 2N4391 N CHAN D MODE TRANSISTOR J FET 2N4391 N CHAN D MODE TRANSISTOR J FET 2N4391 N CHAN D MODE TRANSISTOR J FET 2N4391 N CHAN D MODE TRANSISTOR J FET 2N4391 N CHAN D MODE TRANSISTOR NPN SI PD 300MW FT 200MHZ TRANSISTOR PNP 2N2907A
317. input is set by R77 the Y input by R81 and the overall multiplier by R75 and R79 The output of the Tune Multiplier is a current which is summed directly with the current from the Balance Multiplier and applied to Sum Amplifier 2 see Service Sheet 3 The dc level into the Tune Multiplier is also measured by the DC Voltmeter to give the Controller an indication of whether or not the Notch Filter is properly tuned 8 35 cl s s OO Service Model 8903B TROUBLESHOOTING SERVICE SHEET 4 TROUBLESHOOTING General Procedures for checking the Notch Filter Assembly are given below The circuits or points to check are marked on the schematic diagram by a hexagon with a check mark and a number inside for example In addition any points outside the labeled circuit area that must be checked are also identified Fixed signals are shown on the schematic also inside a hexagon for example lt 1 9 TO 2 1 VDC gt Extend the board assembly where necessary to make measurements These procedures assume that the source is working properly Equipment Oscilloscope cei eR oes ped HP 1740A lt 41 Notch Filter Tune and Balance Check 1 On the Audio Analyzer key 41 0 SPCL to initialize the instrument Set the INPUT and OUTPUT switches to ground Key in AMPTD 1 V Key in 1 11 SPCL to set the input gain to 0 dB Key in 3 1 SPCL to set the output gain to 0 dB Key in 53 1 SPCL and 54 147 SPCL to tune the Notch Filter t
318. int Position of Level MESE at nel Pin On Filter Both Off L Left A2A1 H Right A2A2 H Hint If the signal is only slightly out of limits perform the 400 Hz High Pass and Weighting Bandpass Filters Adjustment paragraph 5 11 Hint See Service Sheet 2A or 2B for hints in checking the individual filters 6 Perform the Audio Filters Performance Test paragraph 4 11 or the filter check portion of the simpler Basic Functional Checks paragraph 3 10 Hint If the passband gain is correct but the frequency response 15 out of limits check the frequency response determining resistors and capacitors of the respective filter See Service Sheet 2A or 2B lt Input Range Detector Check On the Audio Analyzer key in 41 0 SPCL to initialize the instrument Set the INPUT and OUTPUT switches to ground Key in AMPTD V Key in 1 11 SPCL to set the input gain to 0 dB Connect the HIGH OUTPUT to the HIGH INPUT 2 Connect a high impedance ac coupled oscilloscope to 2 5 SING END The waveform should be 2 7 2 9 Vpp The period of the signal should be approximately ms Hint If the signal is faulty see Service Sheet and check the Differential to Single Ended Amplifier 3 Use the oscilloscope s vertical gain controls to adjust the waveform amplitude for 7 1 divisions peak to peak 4 Connect the oscilloscope dc coupled to 2 2 RMS Press the appropriate filter key indicated in Table 8B 19 For each setting
319. int Pin 15 of U19 should be a TTL high 8B 34 Model 8903B Service PRINCIPLES OF OPERATION SERVICE SHEET 4 SERVICE SHEET 4 A3 Notch Filter Assembly Tune and Balance Circuits PRINCIPLES OF OPERATION General This portion of the Notch Filter Assembly A3 contains the notch balance and tune circuitry that improves the depth and tuning accuracy of the notch Chopper Circuits The Tune Comparator and Chopper are driven by the signal from Integrator 2 see Service Sheet 3 This signal is in quadrature with the fundamental of the input to the Notch Filter The Balance Comparator and Chopper are driven by the signal from Integrator 1 This signal is in phase with the fundamental of the input to the Notch Filter The Tune and Balance Comparators drive the chopper FETs Q4 and Q5 so that they switch at the zero crossings of the comparator inputs When the outputs of the comparators go high for example when their open collector outputs shut off the FETs switch on short circuit because the gates are grounded through R46 or R48 When the comparators go low putting a large negative voltage at the FET gates the FETs switch off The current from the Tune or Balance Chopper and the Inverting Amplifier are summed together at the inverting input of the Tune or Balance Integrator The chopper current is weighted by a factor of two because the path resistance from the chopper is about half of the path resistance from the Inverting Amplifi
320. ip is in contact with the printed circuit board e The size and shape of the soldering iron tip e The pressure of the soldering iron tip on the pad e The operator s skill When replacing components on HAL printed circuit boards the following steps should also be taken i Use a temperature controlled soldering iron set at a temperature of 600 F 315 C Extensive tests were made by Hewlett Packard using commercial brands of soldering irons As a result of these tests the recommended soldering iron was the HEXACON THERM O TRAC STATION 1000 with the FINGER GRIP SLEEVE 21 5 and solder tip 301 X During soldering the tip temperature of the HEXACON THERM O TRAC STATION remained very stable 2 Cut out the body of the component to be removed Leave leads as long as possible for easier removal 3 Apply heat to the lead only add solder as required slide tip down to the pad and remove solder with solder sucker 8 4 rev 23JUL66 Model 8903B Service CAUTION Tip pressure on the pad is most critical and is totally operator dependent Excessive tip pressure will damage or destroy the board Do not use tin desoldering braid or solder wicking techniques on Hot Air Leveled boards The melting point of soldcr in the plated through hole PTH is reached in 2 5 seconds at tip temperature of 600 to 750 F 315 to 400 C The recommended time for heat to be applied is 3 seconds Keep the solder sucker clcan and do not let the tip of
321. iption Mfr Part Number Designation Number D Y P Code 1820 1193 5 4 IC CNTR TTL LS BIN ASYNCHRO 01295 SN74LS197N ARU2 1820 1193 5 IC CNTR TTL LS BIN ASYNCHRO 01295 SN74LS197N 1820 1201 6 1 IC TTL LS AND QUAD 2 INP 01295 SN74ULSOBN ABUA 1820 1197 9 GATE TTL LS NAND QUAD 2 INP 01295 SN74LSOON ABUS 1820 1928 4 1 IC F8 MPU CLK FREQ 2 MHZ 28480 1820 1928 1200 0654 7 3 SOCKET IC 40 CONT DIP OIP SLDR 28480 1200 0654 ABUG 1820 2027 6 1 IC STATIC MEMORY INTERFACE 28480 1820 2027 1200 0654 7 SOCKET IC 40 CONT DIP SLDR 28480 1200 0654 ABU7 1820 1417 6 IC GATE TTL LS NAND QUAD 2 INP 01295 SN74LS26N 1200 0638 7 2 SOCKET IC 14 CONT DIP SLOR 28480 1200 0638 ABUS NOT ASSIGNEO ABUS NOT ASSIGNED A8U10 NOT ASSIGNED ABUT 1 NOT ASSIGNEO ABU12 ASSIGNED 8013 ASSIGNED ABU15 1820 1103 5 CNTR TTL LS BIN ASYNCHRO 01295 SN74LS197N 816 1820 1287 8 1 TTL LS QUAD 2 INP 01295 SN 4ALS37N ABU17 1820 1417 6 TTL 5 NAND QUAD 2 INP 01295 SN74ALS26N 1200 0638 7 SOCKET C 14 CONT DIP DIP SLOR 28480 1200 063B ABUTS 1820 1199 1 IC INV TTL LS HEX 1 INP 01295 SN74LSO4N ABU19 1820 1202 7 GATE TTL LS TPL 01295 SN74LS10N 820 1820 1199 1 IC INV TEL LS 1 INP 01295 SN74LSO4N 8121 1820 1216 3 DCDR TTL LS 3 TO 8 LINE 3 INP 01295 SN74LS 139N ABU22 1820 1216 3 DCDR TTt LS 3 TO 8 LINE 3 INP 01295 65 7415138 ABU 23 1820 0174 0 1 IC INV TTL HEX 01295 SN7404
322. is proportional to the log of the product of the two collector currents I x I Since the sum of the base emitter voltages of Q1B and Q2B equals the sum of Q1A and Q2A the products of the respective collector currents are equal 1 2 x I Recalling that the dc component of I produced the output voltage Vouyr and that the output voltage produced I it is evident that the output voltage is proportional to the square root of the product of L and I and thus is proportional to the input voltage Vis which has been squared filtered to obtain the mean level and the square root obtained Refer now to the schematic diagram Figure 8B 117 SS6 The switches of U23 and U25 control whether the detector functions as a true rms average or quasi peak responding converter The switch modes are cataloged in Table 8B 27 8B 42 rev 20J UN87 8903 Service C53 R80 R91 R92 Figure 8B 33 Simplified Diagram of the Output RMS Detector Table 8B 27 Detector Switching Modes Detector State of Mode U23A U23C U24A U24C U23B U23D U24B U24D U25A U25B U25C U25D True RMS Open Closed Open Closed Average Closed Open Open Closed Quasi peak Closed Open Closed Open In the average responding converter mode full wave rectification of the input signal is performed by U5 as with the true rms converter But current summing is via R158 R157 and U22 Filtering is done via the Filter Amplifier but bypassing the ant
323. ith a cotton swab over the affected area 8B 16 Model 8903 Service TROUBLESHOOTING SERVICE SHEET 1 TROUBLESHOOTING General Procedures for checking the Input Amplifier Assembly are given below The circuits or points to check are marked on the schematic diagram by hexagon with a check mark and a number inside for example gt In addition any points outside the labeled circuit area that must be checked are also identified Fixed signals are shown on the schematic also inside a hexagon for example lt 1 9 TO 2 1 VDC gt Extend the board assembly where necessary to make measurements These procedures assume that the source is working properly Equipment OSentoscoDe HP 1740A Test Oscillator HP 3310A lt V1 gt Input Attenuator and AC DC Switch Check 1 On the Audio Analyzer key in 41 0 SPCL to initialize the instrument Set the INPUT switch to FLOAT and the OUTPUT switch to ground Key in AMPTD 3 V Connect the HIGH OUTPUT to the HIGH INPUT Connect a high impedance ac coupled oscilloscope to the gate of Q7A 2 Key in the Special Functions listed in Table 8B 13 For each setting the peak to peak amplitude should be within the limits indicated The period of the signal should be approximately ms If the signal level is incorrect also check the control signals indicated Table 8B 13 Amplitude Limits at the Gate of Q7A 9 lt J1 gt Steps 2 and 4 Oscill
324. itialize the instrument Set the INPUT switch to FLOAT Key in 1 11 SPCL to set the input amplifier gain to 0 dB 2 Set the test oscillator to kHz and level to approximately Vrms Connect the output to the Audio Analyzer s HIGH INPUT 3 Connect a high impedance dc coupled oscilloscope to the gate of Q7A 4 Short A7TP6 RSI to ASTP16 5V to inhibit the Input Overload Flip Flop See Service Sheet 12 5 Increase the test oscillator level to approximately 30 Vpp The waveform on the oscilloscope should appear as shown in Figure 8B 3 Figure 8 3 Waveform for C Z 2 gt Steps 5 and 6 6 Connect the oscilloscope to the gate of Q9A Connect the test oscillator to the LOW INPUT The waveform should appear as shown in Figure 8B 3 C X3 gt Differential to Single Ended Amplifier 1 On the Audio Analyzer key in 41 0 SPCL to initialize the instrument Set the INPUT switch to FLOAT and the OUTPUT switch to ground Key in AMPTD 80 mV Connect the HIGH OUTPUT to the HIGH INPUT 2 Connect a high impedance ac coupled oscilloscope to the gate of Q7A The waveform on the oscilloscope should be between 216 and 236 mVpp The period of the signal should be ms 3 Use the oscilloscope s vertical gain controls to adjust the waveform amplitude for 2 divisions peak to peak 4 Connect the oscilloscope to 2 5 SING END Key in the Special Functions listed in Table 8B 14 For each setting increase the oscilloscope s vertical gain by t
325. l Special Functions Example 1 the measurement path of the input signal is a Programmable Gain Amplifier located the 2 Input Amplifier Assembly simplified diagram of the circuit is shown in Figure 8 4 Amplifier gain is selected by analog switches U11 1 U11 2 U11 3 and U11 4 Table 8 2 shows the Direct Control Special Functions that can be used to control the switches Special Function 1 N is normally used to set the amplifier gain in troubleshooting This example was chosen to illustrate the concept of Direct Control Special Functions because of its simplicity set the gain to 8 dB key in 0 722 SPCL or 722 SPCL The displays will show 0010 0010 indicating that the Controller received d 2 from the keyboard or HP IB issued it to the Instrument Bus and read it back If circuitry on the assembly is working properly only switch U11 3 should be closed and thus the signal is amplified by 8 dB Table 8 2 Programmable Gain Amplifier Switching Direct Control Special Functions Direct Controi Switch Gain Special Function Closed Notice that the display no longer shows a measurement result No annunciators are lighted except REMOTE and ADDRESSED if the Special Function is entered via and only the SPCL key is lighted If any key other than a number key the S Shift key or the LCL key is pressed the instrument 8 8 rev 20JUN87 Model 8903 Service 0 A2 INPUT AMPLIFIER ASSEMBL
326. lace it with a revision date of rev 10MAY87 e R211 On page 8B 114 4 in the lower left hand corner of the component locator add R211 between R209 and R210 On the Component Coordinates e R211 On page 8B 114 3 add R211 A 3 to the partial coordinates table 2717A to 2742A On the A13 schematic e 08903 60192 Change the part number of the A13 POWER SUPPLY AND MOTHERBOARD ASSEMBLY from 08903 60129 to 08903 60192 2728A and below On the A4 schematic e SS6 The 08903 60128 board is obsolete to replace this board you must order the 08903 60282 not Quasi Peak Note The 08903 60282 not Quasi Peak and the 08903 60283 Quasi Peak are identical boards except for the positioning of W1 See partial schematic on page 8B 116 5 and the Component Locator on page 8B 116 6 556 rev 14FEB89 8B 116 1 Service 2730A to 2813A for HP8903B and 2730 to 2814A for HP8903E 2813A and above SS6 8B 116 2 Model 8903B E CHANGES On the A4 schematic e 4 Use the new schematic foldout on page 8B 116 3 Delete the page number 8B 116 3 and replace it with a revision date of rev 10M AY87 On the Component Locator A4 Use the partial component locator on page 8B 114 3 On the Component Coordinates e A4 Use the partial component coordinates on page 8B 114 3 Under Notes e Add the following notes NOTE 5 When in 5 7 Special Quasi the AVG RMS line is high NOTE 6 Unused gates U29C and
327. laced as a matched pair To order use part number 08903 80035 OF ST LOW LOW LOW HIGH HIGH HIGH IPS TP2 TR Ch TPS TPS TP 1238 40dB 2408 2408 4098 1288 e 2 2 2 2 2 7 2 1 BLACK 2 i MP2 RED js Em 9 C109 e e U20 o 692 C10 em lt 9 690 C103 9 i tr 2D o m aan Qo 02 ILO R3 1 3 Ls ye EES m m m 010 48 U1 4 gt BP K7 2 1 U3 15 j o T c CAA C2 I CIO ro H aua R50 2 5 00000000000000000000 R105 C70 K 235 R17 96 B wt C 844 227 aij sss 54 3 R10 U14 f 2 Figure 88 102 SERVICE SHEET 1 INFORMATION Component Locator BD2 Schematic General Information SEE REVERSE SIDE 8 102 Service Model 8903B CHANGES Under Notes ince ting S operate th the tab either po In f inserted wi 1 gt Ircult correctly in the c 7 8 9 and 10 are double FET packages they w up or down Note 1 Add the following information under Note 1 551 102 1 rev 12NGVY 36 Model 8903 CHANGES Under Notes All serial prefixes e Note 1 Add the following information under Note 1
328. le Parts Model 8903B MP13 Figure 6 1 Cabinet Parts 6 108 rev 22M AY90 Model 8903B Replaceable Parts MP39 A13 MP34 A11 A12 A10 MP30 A9 mn 8 6 A5 A4 A3 MP24 RE MP25 W5 W1 EXCEPT OPT 001 W2 EXCEPT 001 W3 OPT 001 ONLY W3 OPT 001 ONLY 22MAY 9 109 Replaceable Parts Model 8903B A1MP13 A1MP34 1 A1MP6 A1MP29 1 14 2 1 12 A1MP16 A1MP17 A1MP8 A1MP5 N 21 N A1MP22 A1MP21 ATMP10 AIMP40 1 24 A1MP28 MP32 1 26 1 18 T Js ge N EE us 2 i eo AME d Im L2 UM 2 y i z NTC RE E E 4 E ES J 2 1 d Mond E ht e A1MP7 Wi MP41 1 25 1 2 A1MP37 A1MP27 A1MP11 51 A1MP23 A1MP33 AIMP35 A1MP38 MP22 and MP23 LABEL HOLDER AND LABEL Except Option 001 Figure 6 3 Chassis and Mechanical Parts Identification Front Panel A10J1 MP28 MP29 A14 HP IB MP31 HEAT SINK HEAT SINK LINE POWER CONNECTOR LABEL PANEL A12J4 PANEL COVER MODULE MP33 A12J2 T1 TRANSFORMER RED LABEL ASSY SIDE OF UNDER REAR PANEL REAR PANEL Figure 6 4 Chassis and Mechanical Parts Identification Rear Panel 2742A and above 62110 rev 22MAY90 Model 8903B Replaceable Parts OPTION 001 ONLY Figure 6 5 Chassis and Mechanical Parts Identification Rear Panel Including Option 001 rev 22M AY90 6
329. lel to A4C16 C18 In the upper portion of the A4 schematic under LOW PASS FILTERS PASS BAND GAIN 2 change the value of C18 to 91 pF U9A In the upper portion of the A4 schematic under LOW PASS FILTERS PASS BAND GAIN 2 locate U9A 13 and delete F2 on the 15V supply line locate U9A pin 4 and delete F2 on the 15V supply line On the Component Locator U1 U2 U6 U8 U12 U13 U1 U2 U6 U8 112 and U13 are round cans and the tabs should be in the 2 00 o clock position R211 On page 8B 114 4 in the lower left hand corner add R211 between R209 and R210 On the Component Coordinates R211 On page 8B 114 3 add R211 A 3 to the partial component coordinates table On the A13 schematic 08903 60192 Change the part number of the A13 POWER SUPPLY AND MOTHERBOARD ASSEMBLY to 08903 60192 On the A4 schematic 08903 60282 The 08903 60128 board is obsolete to replace this board you must order the 08903 60282 not Quasi Peak Note The 08903 60282 not Quasi Peak and the 08903 60283 Quasi Peak are identical boards except for the positioning of W1 See partial schematic on page 8B 116 5 and the Component Locator on page 8B 114 4 555 8 114 1 Service 2730A to 2813A for HP8903B and 2730A to 2814A for HP8903E 2813A and above 2816A and above for HP8903B and 2818A and above for HP8903E 5 8 114 2 Model 8903B E CHANGES On the A4 schematic e 08903 60183 Change
330. lly open NOM nominal NORM norma NPN negative positive negative NPO 1525235 negative positive zero zero tempera ture coefficient NRFR not recommended for field replacement NSR not separately replaceable nS unus LESE nanosecond AW u inb iae nanowatt OBD order by description Table 6 2 Abbreviations 2 of 2 OD outside diameter peak working Pn oval head voltage OP AMPL operational resistance amplifier capacitance oae option RECT rectifier OSG oia Ra oscillator uua ios reference e do oxide REG regulated OZ dba ounce replaceable ns ohm radio frequency B peak used in parts RFI radio frequency list interference PAM pulse amplitude round head right hand modulation resistance printed circuit inductance PCM pulse code modula capacitance tion pulse count HMO rack mount only modulation rms root mean square PDM pulse duration round modulation ROM read only memory DE LII picofarad R amp P rack and panel PH BRZ phosphor bronze RWV reverse working u u L S OTI Phillips voltage PIN positive intrinsic scattering parameter negative Second time PIV
331. lock jumps to the error return point and sets the GUARB guarantee bit RESTB reset bit and FIRSTB first bit OVERHEAD 1 iB HARDWARE SETUP OSCILLATOR CONTROL 3 If RESTB is set the OSCILLATOR CON TROL block will not execute and RESTB will be cleared 4 Certain blocks may or may not execute during different measurement modes depending upon OSCOFFB SET relevancy bits and other conditions 5 OSCILLATOR TUNE 5 The OSCOFFB oscillator off bit is set on alternate Signal to Noise S N measurement cycles 6 The GUARB indicates a valid measurement is guaranteed It is set by most interrupts errors trigger mode and under some conditions in the OVERHEAD 1 block e g it is always set in Signal to Noise measurement mode It is also cleared by some conditions in OVERHEAD 1 block 7 The FIRSTB indicates the first cycle after an h interrupt or error It is cleared in the OVER AND MEAS HEAD 2 block NO 8 MEASIB is set if the instrument is in the MANIPULATE DATA 2 Signal to Noise measurement mode and it is the first pass after an interrupt It takes two PP EIS DUTPUTS passes to measure Signal to Noise Therefore the instrument must restart without a display output and clear MEASI1B at the end of the first pass OVERHEAD Figure 8 1 Supervisor Flowchart 8A 6 rev 20JUN87 Model 8903 Service TROUBLESHOOTING General The troublesho
332. log of the Pre Notch RMS Average Detector minus the log of the Output RMS Average Quasi peak Detector The Pre Notch RMS Average Detector produces a current which flows through R57 and logging transistor Q4A The voltage developed across the base emitter junction of Q4A is proportional to the log of its collector current Similarly the Output RMS Average Quasi peak Detector produces a current which flows through R56 and logging transistor Q4B and develops a base emitter voltage proportional to the log of its collector current The voltage at the base of Q4A with respect to ground is equal to the difference between the base emitter voltages of Q4A and Q4B The feedback amplifier Q17C amplifies this difference and produces the output Note that the collectors and bases of both Q4A and Q4B are all biased near ground potential Thermistor RT1 thermally compensates for the drift of the two logging transistors The voltage from the SINAD Log Ratio Meter Amplifier is converted to a current by the Meter Transconductance Amplifier which drives the meter CR15 protects the meter against reverse current R83 and C51 add heavy filtering to the often noisy SINAD measurement signal The Meter Peg Off Switch receives commands from the Controller via the Latch Assembly which enable gently peg or switch off the meter via the Meter Transconductance amplifier depending the measurement being made and the SINAD measurement range low at the inverting input
333. loscope to 4 1 DC OUT Connect the other channel pin 7 of U18 Both channels should read between 42 9 and 43 1 Vde and both should read the same Hint If the signal at A4TP1 is faulty see Service Sheet 6 and check the Output RMS Average Detector 5 On the Audio Analyzer connect and disconnect the HIGH INPUT several times and observe the two traces on the oscilloscope The signal at pin 7 of U18 should lag slightly behind the signal at A4TP1 when the input is connected and disconnected 6 On the Audio Analyzer reconnect the HIGH INPUT Move the oscilloscope connection from pin 7 of U18 to pin 11 Both channels should read the same 7 On the Audio Analyzer connect and disconnect the HIGH INPUT several times and observe the two traces on the oscilloscope The signal at pin 11 of 1 18 should lag behind the signal at A4TPI when the input ts connected and disconnected The lag will be longer than for the previous steps C 72 gt Voltmeter Input Selector Check 1 On the Audio Analyzer key in 41 0 SPCL to initialize the instrument Set the INPUT and OUTPUT switches to ground Key in AMPTD 3 V Key in 1 11 SPCL to set the input gain to 0 dB Key in 3 1 SPCL to set the output gain to 0 dB Connect the HIGH OUTPUT to the HIGH INPUT 2 Key in the Direct Control Special Functions listed in Table 8B 28 For each setting compare the dc voltage at A4TP9 MUX to the pin U18 indicated The two voltages should be the same to within
334. loscope to A4TP11 RECT The waveform should be a negative full wave rectified sine wave with a peak amplitude between 4 5 and 4 0V Hint If the signal is faulty perform the Full Wave Rectifier Check 6 Connect the voltmeter to A4TP1 DC OUT The voltmeter should read between 2 9 and 3 3 Vdc Hint Pin 6 of U3 should also be between 2 9 and 3 3 Vdc and read the same as A4TP1 rev 20J UN87 8B 47 Service Model 8903B 7 Connect the voltmeter to pin 6 of U12 The voltmeter should read between 2 5 to 2 0 Vdc Hint emitter of Q2B should be approximately 640 mVdc Hint At this point operation of the Filter Amplifier has been verified except for 91 CR14 023 024 and the filtering capability of the circuit Check U23 1724 by performing the 7 1 Output RMS Average Quasi peak Detector General Check SINAD Meter Circuits Check 1 On the Audio Analyzer key in 41 0 SPCL to initialize the instrument Set the INPUT and OUTPUT switches to ground Key in AMPTD 1 V Key in 1 11 SPCL to set the input gain to 0 dB Key in 3 1 SPCL to set the output gain to 0 dB Key in 45 1 SPCL to enable the SINAD meter Connect the HIGH OUTPUT to the HIGH INPUT 2 Connect a dc voltmeter to ASTP15 RMS2 On the Audio Analyzer fine adjust the SOURCE amplitude for a reading of 1 00 Vdc on the voltmeter Hint The voltage at 15 should read approximately 1 Vdc before adjustment If it does not see Service Sheet 3
335. ltage WW wirewound WO 2 oua acea ats without YIG 222 yttrium iron garnet characteristic impedance Model 8903 Replaceable Parts Tuble 6 3 Replaceable Parts Reference HP Part C Q D escription Mfr Part Number Designation Number D ty P Code 2150A TO 27804 1 08903 60166 9 1 KEYBOARD AND DISPLAY ASSEMBLY 28480 08903 60166 27214 AND ABOVE A1 08903 60193 2 1 KEYBOARD AND DISPLAY ASSEMBLY 28480 08903 60193 A1C1 0180 0229 7 1 CAPACITOR FXD 33UF 10 10VOC 56289 1500336 9010 2 A1C2 0160 2055 9 4 CAPACITOR FXD 01UF 80 20 100VDC CER 28480 0160 2055 A1C3 0160 2291 5 1 CAPACITOR FXD 18UF 4 10 80VDC POLYE 28480 0160 2291 1 4 0160 2055 9 CAPACITOR FXD 01UF 80 20 100VDC CER 28480 0160 2055 C1C5 0160 2055 9 CAPACITOR FXD 01UF 80 20 100VDC CER 28480 0160 2055 1 5 0150 2055 9 CAPACITOR FXD 01UF 80 20 100VDC CER 28480 0160 2055 A1DS1 1990 0719 8 14 LED LAMP LUM INT 1MCD IF 20MA MAX BVR 5V 28480 1990 0719 1052 1990 0719 8 14 LED LAMP LUM INT 1MCD IF 20 BVR 5V 28480 1990 0719 A1DS3 1990 0719 e 14 LED LAMP LUM INT 1MCD IF 20 BVR 5V 28480 1990 0719 1064 1990 0719 8 14 LUM INT 1MCD IF 20 BVR 5V 28480 1990 0719 A1DS5 1990 0719 8 14 LED LAMP LUM INT 1 1 20 BVR 5V 28480 1990 0719 A10S6 1990 0719 14 LED LAMP LUM INT 1 IF 20MA MAX BVR 5V 2848C 1990 0719 A1DS7 1990 0719 8 14 LED LAMP LUM INT 1MCD F 20
336. lters available depend upon the options installed Two types of filters are available a 400 Hz high pass filter or weighted response bandpass filter Table 8A 2 enumerates the filter combinations available The two filters can be installed in either order with respect to the two front panel keys or HP IB codes thus each filter has two option numbers If no filter options are installed the filter positions are jumpered Table 8A 2 Filter Options _ Option Numbers 400 Hz High Pass 010 or 050 CCITT or Psophometric Bandpass 011 or 051 CCIR Bandpass 012 or 052 C Message Bandpass 013 or 053 CCIR ARM Bandpass 014 or 054 A Weighting Bandpass 015 or 055 Filter selection is via front panel keys or HP IB Both are active filters T he Weighting Bandpass Filter generally has a standardized frequency response that simulates the response of a telecommunications system as perceived by human hearing It gives predominance to 1 kHz The Pre Notch RMS Average Detector is read by the Controller via the dc voltmeter for the distortion and SINAD measurements and also the analog SINAD meter Its output becomes the numerator of the SINAD measurement and the denominator of the distortion measurement Notch Filter The Notch Filter is inserted into the signal path in the distortion distortion level and SINAD measurement modes It is coarse tuned by the Controller When measuring distortion the Controller sets the Notch Filter to the fr
337. ly are given below The circuits or points to check are marked on the schematic diagram by a hexagon with a check mark and a number inside for example lt 73 gt In addition any points outside the labeled circuit area that must be checked are also identified Fixed signals are shown on the schematic also inside a hexagon for example lt 1 9 TO 42 1 VDC gt Extend the board assembly where necessary to make measurements These procedures assume that the source is working properly Equipment Oscilloscope HP1740A C V1 Notch Filter Check 1 On the Audio Analyzer key in 41 0 SPCL to initialize the instrument Press DISTN Short pin 3 of US to GND 2 Connect a high impedance dc coupled oscilloscope to A3TP5 BP OUT A3TP6 HP OUT A3TP7 OUT and A3TP14 LP OUT one at a time The dc offset level superimposed on an ac signal for each should be between 200 to 200 mVdc 3 On the Audio Analyzer remove the short at pin 3 of US Short A3TP3 TUNE and A3TP4 BAL both to GND 4 On the Audio Analyzer set the INPUT and OUTPUT switches to ground Key in AMPTD 2 V Kev in 1 11 SPCL to set the input gain to 0 dB Connect the HIGH OUTPUT to the HIGH INPUT 5 AC couple the oscilloscope and connect it to A2TP3 OUT see Service Sheet 2 Increment the Audio Analyzer s SOURCE amplitude to obtain exactly 6 Vpp on the oscilloscope Hint The amplitude at A2TP3 should be app
338. mber identifies the base color second number identifies the wider stripe and the third number identifies the narrower stripe e g 947 denotes white base yellow wide stripe violet narrow stripe A direct conducting connection to earth or a conducting connection to a structure that has a similar function e g the frame of an air sea or land vehicle A conducting connection to a chassis or frame Common connections like designation points are connected Letter off page connection Number Service Sheet number for off page connection In the example signal flow is continued on Service Sheet 12 at the point marked Number only on page connection Service Model 8903B SCHEMATIC SYMBOLOGY AND SCHEMATIC DIAGRAM NOTES Table 8 6 Schematic Diagram Notes 3 of 11 gt c Indicates multiple paths represented by only one line Letters or names identify indi vidual paths Numbers indicate number of paths represented by the line 9 Coaxial or shielded cable Ferrite bead Increases the self inductance of the conductor passing through the bead Relay Contact moves in direction of arrow when energized Indicates a pushbutton switch with a momentary ON position Feedthrough capacitor Acts as a feedthrough terminal when mounted on a chassis or a frame Indicates a PIN diode Indicates a current regulation diode Indicates a capacitive varactor diode Ind
339. mode Amplifiers 1 and 2 and Attenuator are switched between a normal and an off state The Controller reads the Output RMS Average Quasi peak Detector for both states and computes the ratio In the off state the gain of Amplifier 1 is lowered by 6 dB Amplifier 2 is set to 60 dB gain and Attenuator is shorted to ground This off state also occurs when a source level of 0V is selected rev 20J UN87 8A 3 2 Service Model 8903B The Floating Output Amplifier generates a differential output signal that is a signal not referenced to ground Either OUTPUT terminal HIGH or LOW may be grounded or floated up to 10 Vpk This feature is useful for breaking up ground loops summing signals and adding dc offsets to the output Attenuator B is also floating For instruments with serial prefix 2730A and below the output irapedence is selected by a non programmable front panel IMPEDENCE switch for either 500 or 6000 For instruments with serial prefix 2742A and above the output impedance can be selected from the front panel or via HP IB by using Special Functions 47 The Over Voltage Protect circuit protects the output circuits from the inadvertent application of a reverse voltage to either the HIGH or LOW OUTPUT connector The reverse voltage is sensed by an over voltage detector which opens two output relays The relays automatically reset about 15 after the overvoltage is removed The Voltage Clamp protects the
340. mplifier Check 1 On the Audio Analyzer key in 41 0 SPCL to initialize the instrument Set the INPUT and OUTPUT switches to ground Key in AMPTD 3 V Key in 1 11 SPCL to set the input gain to 0 dB Key in 3 1 SPCL to set the output gain to 0 dB Connect the HIGH OUTPUT to the HIGH INPUT 2 Connect a high impedance dc coupled oscilloscope to the cathode of CR11 The waveform should be a half wave rectified sine wave with a peak amplitude between 4 0 and 4 5V period should be approximately 1 ms Hint If the signal is faulty perform the Full Wave Rectifier Check 3 Connect the voltmeter to A4TP2 LOG AMP Set the voltmeter to measure dc The voltmeter should read between 1 26 and 1 21 Vdc This voltage is valid only at room temperature 4 Connect the voltmeter to pin 6 of U4 voltage should be approximately 2 3 Vdc Hint If the voltage is closer to 2 0 Vdc the Log Amplifier is operating properly but no current is flowing in the emitter of Q1B the fault is in the Filter Amplifier If the voltage is closer to 3 0 Vdc the Log Amplifier is operating properly but no current is flowing in the collector of Q1B the fault is in the Filter Amplifier The fault is probably causing the output of U12 to be clamped to 0 5 Vdc whereas it is normally negative 9 On the Audio Analyzer key in 5 2 SPCL to set the detector to average This isolates the Amplifier Filter from the Log Amplifier Connect the oscil
341. n Category II and Pollution Degree 2 per JEC 1010 and IEC 664 respectively FOR INDOOR USE ONLY This product has autoranging line voltage input be sure the supply voltage is within the specified range Chapter 1 Regulatory Information Updated March 1999 To prevent electrical shock disconnect instrument from mains line before cleaning Use a dry cloth or one slightly dampened with water to clean the external case parts Do not attempt to clean internally Ventilation Requirements When installing the product in a cabinet the convection into and out of the product must not be restricted The ambient temperature outside the cabinet must be less than the maximum operating temperature of the product by 4 C for every 100 watts dissipated in the cabinet If the total power dissipated in the cabinet is greater than 800 watts then forced convection must be used Product Markings CE the CE mark is a registered trademark of the European Community A CE mark accompanied by a year indicated the year the design was proven CSA the CSA mark is a registered trademark of the Canadian Standards Association p 4 Chapter 1 REGIONAL SALES AND SERVICE OFFICES ASIA Hewlett Packard Asia Ltd 47 26 Harbour Rd Wanchai HONG KONG G P O Box 863 Hong Kong Tel 5 8330833 Telex 76793 HPA HX Cable HPASIAL TD CANADA Hewlett Packard Canada Ltd 6877 Goreway Drive M
342. n the Audio Analyzer are listed in Tables 1 3 and 1 4 Equipment other than that listed may be used if it meets the listed critical specifications 8 10 SERVICE TOOLS AIDS AND INFORMATION 8 11 Service Accessories The accessory items required for servicing the Audio Analyzer are listed in Table 1 4 Three 44 contact extender boards HP 08901 60084 are required for the observation of waveforms and signatures on the A7 assembly Two 30 contact extender boards HP 08901 60085 are required for the A3 and A4 assemblies One each of the 44 and 30 contact extender boards are required for use with the A2 A5 and A6 assemblies The Digital Test Extender Board HP 08903 60018 is required for troubleshooting the A8 Controller Counter Assembly Refer to Figure 8 1 The conductive polyurethane foam pad HP 4208 0094 is required for the protection of MOS devices as cautioned in paragraph 8 8 and Service Sheets BD4 and 14 8 12 Heat Staking Tool The front panel pushbutton switches have small plastic pins protruding from the back These tabs fit through holes in the front panel printed circuit board assembly A1 and are melted down to hold the switch in place This process is known as heat staking The heat staking tool is a standard soldering iron with a special tip attached see Figure 8 2 8 13 Assembly Locations Assemblies in the Audio Analyzer are numbered sequentially from front to back as shown in Figure 8 3 Assem blies A2 through A9 have
343. nding to the rms level of the signal The detector can also be configured to produce the absolute average or quasi peak value of the signal using Special Function 5 The output is measured by the DC Voltmeter for computing measurement rev 20JU N87 8B 3 Service Model 8903B PRINCIPLES OF OPERATION SERVICE SHEET BD2 INTEGRATOR 1 INTEGRATOR 2 SUM AND OUTPUT AMPLIFIER wm Transfer Function at Type of Response Transfer Function 22222 e w 9 Notch Filter INN NM 20 020 C 2 200 High Pass Filter 12962002 s 124025 Co Bandpass Filter 2 _ 2 120102092 wr 2 2 270 Low Pass Filter 2 _ EM j2aW Ww PRA Figure 8B 1 Simplified Diagram of the Notch Filter with Transfer Functions Given for Various Points 8B 4 rev 20J UN87 Model 8903 Service PRINCIPLES OF OPERATION SERVICE SHEET BD2 TUNE INTEGRATOR INVERTING AMPLIFIER VNOTCH 2 BALANCE INTEGRATOR VNOTCH VNOTCH Figure 8B 2 Notch Filter Tune and Balance Detectors rev 20JU N87 8B 5 Service Model 8903B Table 8B 3 Summary of Attenuator Switching Post Notch Amplifier Attenuation dB Gain Special eS 2 results and setting the gain of the Output Amplifier the rms configuration the circuit is an analog computer consisting of a full wave rectifier log amplifier and antilog amplifier and filter The Output Overload Detector compares the output of
344. o 1 kHz Connect the HIGH OUTPUT to the HIGH INPUT 2 Connect a high impedance ac coupled oscilloscope to A4TP8 AMP 1 see Service Sheet 5 The waveform should be between 1 1 and 1 7 Vpp The period of the signal should be approximately 1 ms Hint If the signal is faulty see Service Sheet 3 and check the Notch Filter and Service Sheet 5 and check Attenuator and Amplifier 1 3 Connect the oscilloscope to A3TP2 NOTCH AMP The waveform should be between 12 and 19 Vpp 4 DC couple the oscilloscope and connect it to A3TP4 BAL The dc level should be between 5 and 4 Vdc Hint Pin 7 of U8B should be a 0 to 15V square wave with a period of 1 ms The source of Q4 should be a positive half wave rectified sine wave Pin 6 of Ul should be a sine wave with an amplitude of 12 to 19 Vpp Pin 14 of U16D should be 15V Q8 should be off 5 On the Audio Analyzer key in 44 3 SPCL to set the Notch Filter to the bandpass mode The dc level should be between 4 and 5 Vdc Hint 2 should be a sine wave with an amplitude of 10 to 21 Vpp If faulty see Service Sheet 3 and check the Notch Filter Hint Pin 7 of U8B should be a 0 to 15V square wave with a period of ms The source of Q4 should be a negative half wave rectified sine wave 6 Connect the oscilloscope to A3TP3 TUNE On the Audio Analyzer key in 44 2 SPCL to set the Notch Filter to the flat mode Key in FREQ 500 Hz The dc level should be between 4 and
345. o Section 2 A Errata part change rev 16FEB90 6 03 tRefer to Section 7 for update information rev 20JUN91 Factory Selected Component Refer to Section 5 Model 8903B Replaceable Parts Table 6 3 Replaceable Parts Reference HP Part C Q D Mfr escription Mfr Part Number Designation Number D ty p Code A13 08903 60392 3 1 POWER SUPPLY MOTHERBOARD 28480 08903 60392 13 1 0180 2317 8 2 CAPACITOF FXD 3600UF 75 10 40VDC AL 00853 539 7445 02 2650 0099 1 6 SCREW MACH 10 32 375 IN LG PAN HD POZI 00000 ORDER BY DESCRIPTION 2190 0012 9 6 WASHER LK EXT T NO 10 195 IN ID 00000 ORDER BY DESCRIPTION A19C2 0180 2317 8 CAPACITOR FXD 3600UF 75 10 40VDC AL 00853 539 7445 02 2680 0099 1 6 SCREW MACH 10 32 375 IN LG PAN HD POZI 00000 ORDER BY DESCRIPTION 2190 0012 9 8 WASHER LK EXT T NO 10 195 INHD 00000 ORDER BY DESCRIPTION A13C3 0180 0452 8 1 CAPACITOR FXD 013F 75 10 25VDC AL 28480 0180 0452 2680 0099 1 6 SCREW MACH 10 32 375 IN LG PAN HD POZI 00000 ORDER BY DESCRIPTION 2190 0012 9 6 WASHERLK EXT T NO 10 195 INHD 00000 ORDER BY DESCRIPTION 13 4 NOT ASSIGNED A13C5 NOT ASSIGNED A13C6 0180 0291 3 CAPACITOR FXD 1 10 35VDC TA 56289 150D105X9035A2 A13C7 0140 0210 2 1 CAPACITOR FXD 270PF 5 300VDC 72138 DM15F271J0300WV1CR A13C8 0180 0197 8 CAPACITOR FXD 2 2UF 1096 20VDC TA 56289 150D225X9020A2 A13C9 0180 0197 8 CAPACITOR FXD 2 2UF 4 10 20VDC TA 56289 150D225X9020A2 A13C10 0180 0116 1 CAPACITOR FXD 6 8UF 1
346. o prevent reverse voltages from damaging the electrolytic capacitors C65 and C66 since the input voltage can be of either polarity Passive filter R116 and C67 heavily filters the line from the Output RMS Average Detector in the SINAD measurement The Ripple Filter consisting of UIOC and associated components provides a complex impedance across the line from the Output RMS Average Detector and gives two poles of high frequency rolloff The output is buffered by U1 A similar Ripple Filter U10D and associated components filters the line from the Input RMS or Average Detector It is a more complex filter having an extra real pole The output is buffered by U10A Diodes CR17 through CR22 protect the inputs to the Voltmeter Input Selector against high or reverse voltages Voltmeter Input Selector Multiplexer U18 forms an eight pole single throw switch The multiplexer is always enabled by the high on the EN input The Detector Select Switches U9B and U21C selects between the Input Range Detector and the Input RMS Average Detector To change a switch setting the Controller issues the appropriate code to the Instrument Bus The code is decoded and latched on the Latch Assembly see Service Sheet 12 which puts the appropriate logic level on lines VO SEL 0 1 and 2 For a discussion of Instrument Bus control see Service Sheet BD4 Voltage to Time Converter The dc voltage at the DC Voltmeter input is converted to a pulse with a duration linearl
347. o signatures must be identical Signature analysis can be speeded up if the following considerations are kept in mind 1 Make sure that every step is performed as described in the set up procedure That is make sure that the clock start and stop connections and triggering are correct 2 Double check to ensure that the signatures are being taken at the correct node 3 Make sure that the signature analyzer probe is making good contact with the pin being checked Oxidation on pins can cause invalid signatures due to poor contact 4 When you think that you have found a bad signature double check to make sure 5 When checking a node be sure that the unstable signature indicator is not blinking EUER ME SUC I CDI MIDI Kd C ee ORC J ugr ET TE 8 20 rev 20J UN87 Model 8903 SCHEMATIC SYMBOLOGY AND SCHEMATIC DIAGRAM NOTES Service 8 30 SCHEMATIC SYMBOLOGY AND SCHEMATIC DIAGRAM NOTES Table 8 6 summarizes the symbology used in presenting many devices found in the instrument The logic symbols used in this manual are based on the Institute of Electrical and Electronic Engineers IEEE in IEEE STD 91 1984 Graphic Symbols for Logic Functions This publication may be purchased from Institute of Electrical and Electronic Engineers Inc 345 East 47th Street New York NY 10017 Table 8 6 Schematic Diagram Notes 1 of 11 Test points symbols are numbered for
348. or more LEDs or segments indicates that the respective components or drive circuits have failed See Service Sheet 18 2 Read Only Memory Check The checksum of each of the read only memories ROMs is read and compared against a stored reference stored in ROM 1 This is similar to entering a series of 52 N SPCL commands see Service Special Functions paragraph 8 23 When a wrong checksum is found the four TEST LEDs blink for one second with the binary code of the ROM number For example if ROM 5 is faulty the TEST LEDs will blink X4 X1 that is 0101 a binary 5 The check then continues on to the next ROM See Service Sheets BD4 and 16 If no faulty ROM is found a steady XX X1 appears for about char 370 second Serial Prefix 2652A and Above ROM Consolidation does not change this Check Note however that if any check produces an error the entire ROM 10 needs to be replaced 3 Random Access Memory Check Data is stored into and retrieved from th random access memory RAM If the data read back differs from the data entered error code X 2 is output to the TEST LEDs for two seconds See Service Sheet 15 4 Instrument Bus Parity Check A parity check of the data lines of the Instrument Bus is made A failure is indicated by X 2 1 on the TEST LEDs for two seconds See Service Sheets BD4 12 and 16 5 Keyboard Check The keyboard is scanned to see if any keys are down If a key is down error code X4
349. ormed without power supplied the power should be removed Any interruption of the protective grounding conductor inside or outside the instrument or disconnection of the protective earth terminal will create a potential shock hazard that could result in personal injury Grounding one conductor of a two conductor outlet 15 not sufficient Whenever it is likely that the protection has been impaired the instrument must be made inoperative that is secured against unintended operation If this instrument is to be energized via an autotransformer make sure that the auto transformer s common terminal is connected to the earth terminal of the power source Capacitors inside the instrument can still be charged even if the instrument is disconnected from its source of supply Make sure that only 250 volt fuses with the required rated current and of the specified type normal blow time delay etc are used for replacement Do not use repaired fuses or short circuited fuseholders To do so could create a shock or fire hazard CAUTION Do not unplug any boards in the Audio Analyzer unless the instrument is unplugged or switched to OFF Some boards contain devices which can be damaged if the board is removed when the power is on Use conductive foam when removing MOS devices from sockets Use care when unplugging ICs from high grip sockets 8 9 RECOMMENDED TEST EQUIPMENT AND ACCESSORIES Test equipment and test accessories required to maintai
350. oscope Level TTL at U15 Pins Special Display 17 3 Function mVpp 1 11 8100 to 8900 L H H 1 8 2000 to 2200 H L H 1 5 500 to 560 H H L Hint Pin of U16A should be between 10 and 12 Vdc Pin 8 of U14C should be a TTL high Q2 and Q5 should be off 3 Key in 1 1 SPCL to set the input attenuation to 40 dB The waveform should have an amplitude between 81 and 89 mVpp Hint Pin 1 of UI6A should be between 15 and 14 Vdc Pins 16 14 and 3 of U15 should be TTL high Pin 8 of U14C should be a TTL low Q2 and Q5 should be on 4 Connect the oscilloscope to the gate of Q9A Connect the HIGH OUTPUT to the LOW INPUT Repeat steps 2 and 3 The results should be the same 5 On the Audio Analyzer key 1 11 SPCL Connect A8TPI6 5V the LOW INPUT The oscilloscope dc coupled should read 0 Vdc Hint Pins 8 and 12 of U15A should be a TTL high K7 should be open 6 On the Audio Analyzer press S Shift DC LEVEL Key in 2 4 SPCL to set the input attenuation to 0 dB in the dc mode The oscilloscope should read approximately 5 Vdc Hint Pins 8 and 12 of UISA should be a TTL low K7 should be closed 7 Connect the oscilloscope to the gate of Q7A Connect the HIGH OUTPUT to the HIGH INPUT Press AC LEVEL Repeat steps 5 and 6 The results should be the same 8B 17 Service Model 8903B TROUBLESHOOTING SERVICE SHEET 1 C72 Over Voltage Protection Check On the Audio Analyzer key in 41 0 SPCL to in
351. otch Filter range is displayed where 0 is the lowest range and 3 is the highest For N 0 through 3 the Notch Filter is set to the range specified See Service Sheet 3 and Special Function 54 N 54 N Notch Filter Coarse Tune Permits the coarse tune code of the Notch Filter to be displayed or manually set If no suffix is keyed in that is 54 SPCL the current Notch Filter coarse tune code is displayed where 0 8 12 rev 20J UN87 Model 8903 Service is the lowest frequency and 255 is the highest For N 0 through 255 the Notch Filter coarse tune code is set to the number specified by N N is keyed in as a decimal value and not a hexadecimal value Fine tuning of the Notch Filter is via the automatic tuning circuitry on the Notch Filter Assembly See Service Sheet 3 and Special Function 53 N 55 N Oscillator Frequency Range Permits the frequency range of the Oscillator to be displayed or manually set If no suffix is keyed in that is 55 SPCL the current Oscillator range is displayed where 0 is the lowest range and 3 is the highest For N 0 through 3 the Oscillator is set to the range specified by See Service Sheet 8 and Special Functions 56 N and 57 N 56 N Oscillator Coarse Tune Permits the coarse tune code of the Oscillator to be displayed or manually set If no suffix is keyed in that is 56 SPCL the current Oscillator coarse tune code is displayed where 0 is the lowest frequency and 255 is the highest For
352. oting checks that follow are a starting place for locating an instrument fault They are easy to perform and give much key information in a short time In most instances they can differentiate between an instrument hardware failure and Controller or software problem T he comments associated with each procedure summarize the information known as a result of passing or failing the check checks should be done in order For additional information on the troubleshooting philosophy used in these checks refer to General Troubleshooting paragraph 8 16 Line Check Procedure Remove the instrument top cover three screws and switch LINE to ON Normal Indication four green LEDs on the A13 Power Supply and Motherboard Assembly are lighted indicating that the supplies are nominally operating If Indication Abnormal Check rear panel line fuse and line voltage selector Check Mains wiring See Service Sheet 20 Check individual regulators See Service Sheet BD5 72 Power Up Checks Procedure If there are any jumpers on the TEST test points on the A8 Controller Counter Assembly remove them Switch LINE to OFF for five seconds then back to ON Note the sequencing of the four TEST LEDs on the top of the Controller Counter Assembly as the instrument powers up Normal Indication The four TEST LEDs light in the following sequence 1 Indeterminate for about 1 8 second 2 for about second This indicates the start of the
353. output circuits during the time between the application of the reverse voltage and the opening of the relay contacts Counter When the frequency of the input signal or Oscillator is to be counted two sub counters the Cycle and Clock Counters operate simultaneously The signal itself is directed into the Cycle Counter In the case of counting the input signal the signal is first routed through the Counter Input Schmitt Trigger which converts the analog signal into square wave pulses which are compatible with the Cycle Counter The 2 MHz Clock signal is directed into the Clock Counter To count frequency the Controller first sets the Clock Counter Gate switch to route the path from the Frequency Gate switch into the Clock Counter Then the Controller arms the Cycle Counter Gate and Frequency Gate switches and the first signal pulse closes the switches Both counters which were previously cleared then begin to accumulate counts The Cycle Counter is a divide by 32 the Clock Counter is a divide by 2048 The overflow or carry pulses of each counter are counted by the Controller After a pre determined minimum number of carries from the Clock Counter and at least one carry from the Cycle Counter the Frequency Gate and Cycle Counter Gate switches are disabled by the Controller The first signal pulse opens the switches and counting ceases The Controller then reads the contents of the Cycle and Clock Counters and computes the signal frequency which i
354. ppears as a simple square wave check that pin 5 of U18 is between 1 4 and 1 5 Vdc 4 Connect the oscilloscope to A4TP10 COMP The waveform should be as shown in Figure 8B 37 Detector Select Switches Check 1 On the Audio Analyzer key in 41 0 SPCL to initialize the instrument Set the INPUT and OUTPUT switches to ground Key in AMPTD 3 V Key in 1 11 SPCL to set the input gain to 0 dB Key in 3 1 SPCL to set the output gain to 0 dB Connect the HIGH OUTPUT to the HIGH INPUT 2 Connect a dc voltmeter to pin 7 of U9B 3 On the Audio Analyzer key in 0 531 SPCL to select the Pre Notch Detector The voltage should be between 1 4 and 1 6 Vdc Shorting out R201 should reduce the voltage to OV Hint Pin 1 of U10A should be between 2 8 and 3 2 Vdc Pin 9 of U21C should be a TTL low Pin of U9B should be a TTL high 4 On the Audio Analyzer key in 0 539 SPCL to select the Input Range Detector The voltage should be between 1 4 and 1 6 Vdc Shorting out R201 should have no effect Hint Pin 19 of connector A13XAAB should be between 2 8 and 3 2 Ydc Pin 9 of U21C should be a TTL high Pin 8 of U9B should be a TTL low 8B 52 Model 8903 Service TROUBLESHOOTING SERVICE SHEET 7 qt Tt at lu LLLI ates ieee L Figure 8B 35 Voltage to Time Converter Check Step 3 Figure 88 36 Voltage to Time Converter Check gt Step 3 Hint 8B 53 Service Model 8903B TROUBLESHOO
355. ppropriate dependency func tion symbols Open Collector Output Open Emitter Output Three state Output indicates outputs can have a high impedance disconnect state in addition to the normal binary logic states Li LS Lg D ra 8 24 Model 8903 Service SCHEMATIC SYMBOLOGY AND SCHEMATIC DIAGRAM NOTES X Y XY Functional Labels MUX DEMUX CPU Table 8 6 Schematic Diagram Notes 5 of 11 DIGITAL SYMBOLOGY REFERENCE INFORMATION Combinational Logic Symbols and Functions Summing Junction Outputs added together at a common point AND AIl inputs must be active for the output to be active OR One or more inputs being active will cause the output to be active Logic Threshold m or more inputs being active will cause the output to be active replace m with a number EXCLUSIVE OR Output will be active when one and only one input is active m and only m Output will be active when m and only m inputs are active replace m with a number Logic Identity Output will be active only when all or none of the inputs are active i e when all inputs are identical output will be active Amplifier The output will be active only when the input is active can be used with polarity or logic indicator at input or output to signify inversion Signal Level Converter Input level s are different than output level s Bilateral Switch Binary controlled switch which acts as an on o
356. put to the Notch Filter If is in quadrature with as in this example the chopped current 1 4 will consist only of the half cycles going from the positive to the negative peak The dc component of this signal is zero Current 15 is as before Ij and L are summed together to produce a current Is whose average dc level represents the level error of the quadrature component of the signal For this example the result has a dc value of zero 13 is integrated and controls the gain of the Tune Multiplier which tunes the Notch Filter More commonly will have both quadrature and in phase components The tune and balance detectors isolate the respective components and drive the respective multiplier with the error signal The resistors through which I j and L flow can be switched to change the magnitude of the current by a factor of ten This compensates for the gain change in Attenuator 1 of assembly 4 In summary the Tune and Balance Multipliers be visualized as variable gain amplifiers with ac inputs from the bandpass and high pass outputs of the Notch Filter respectively The bandpass output is in phase with the fundamental of the input to the Notch Filter the high pass output is in quadrature The dc inputs from the Tune and Balance Integrators control the gain of the multipliers including the sense of the gain that is inverting or non inverting output currents of the multipliers
357. quivalent by a method called implicit conversion The analog computer performs logging antilogging squaring averaging and dividing mathematical functions When used as an average responding converter the Output RMS Average Quasi peak Detector converts the ac input signal into a dc voltage equal to the absolute average that is full wave rectified and filtered of the input level but calibrated to the rms value of a sine wave When used as a quasi peak converter the Output detector converts the ac signal to its dc quasi peak equivalent This type of detector has a fast rise time coupled with a slow decay time constant which captures impulses or other signals with a high crest factor noise or repetitive signal bursts Refer to Figure 8B 33 which is a simplified diagram of the circuit showing only the components which produce the rms conversion Since the log antilog circuit cannot operate on a bi directional signal the input is full wave rectified Full wave rectification is accomplished by half wave rectifying and inverting the input then summing the rectified current with a current proportional to the input voltage but weighted by one half U5 R55 R62 and CR11 perform the half wave rectification The rectified signal produces a current I in R71 which is summed with the current 1 in R70 at the inverting input to U4 R70 is twice the resistance of R71 U4 Q2A and form the Log Amplifier The full wave rectified current
358. r 4 On the Audio Analyzer key in AMPTD 400 mV Key in 0 76 SPCL to enable readback of the Output Overload Detector The displays should read 0000 0000 If faulty see Service Sheet 6 and check the Output Overload Detector 5 On the Audio Analyzer key in AMPTD 420 mV Key in 0 76 SPCL the displays should read 0001 0000 If faulty see Service Sheet 6 and check the Output Overload Detector Hint Because of the hysteresis in the Output Overload Detector it will be necessary to key in AMPTD 300 mV first if it is desired to repeat steps 4 and 5 6 On the Audio Analyzer key in AMPTD 300 mV Connect the oscilloscope to A4TP9 The waveform should be a pulse waveform switching between 0 Vdc and 2 9 to 3 1 Vdc If faulty see Service Sheet 7 and check the Voltmeter Input Selector 7 The right display should read between 0 29 and 0 31V If faulty see Service Sheet 7 and begin troubleshooting with the Voltage to Time Converter Hint If the other inputs to the Voltmeter Input Selector are suspected to be faulty see Service Sheet 7 and check the Voltmeter Input Selector 8 On the Audio Analyzer press SINAD Key in AMPTD 3 V Key in 3 0 SPCL Key in 45 1 SPCL to enable the SINAD meter The amplitude display should read greater than 80 dB The SINAD meter should read beyond full scale If the amplitude display is faulty see 72 Notch Filter Check If the SINAD meter is faulty see Service Sheet 6 and check the SINAD meter circuits 9 On
359. r 5 divisions peak to peak deflection of the signal 4 On the Audio Analyzer connect TUNE and 4 BAL to 1 GND to defeat the fine tune and balance control Connect the oscilloscope to 5 BP OUT The peak to peak amplitude displayed on the oscilloscope should be between 4 7 and 5 3 divisions If faulty see Service Sheet 3 and check Sum Amplifiers 1 and 2 and Integrators 1 and 2 5 Connect the oscilloscope to A3TP OUT The peak to peak amplitude displayed on the oscilloscope should be between 4 9 and 5 1 divisions If faulty see Service Sheet 3 and check the Sum and Output Amplifier 6 On the Audio Analyzer key in 44 3 SPCL to set the Notch Filter to the bandpass mode peak to peak amplitude displayed on the oscilloscope should be between 4 7 and 5 3 divisions The amplitude display on the Audio Analyzer should read between 2 8 and 3 2V If the oscilloscope waveform is faulty see Service Sheet 3 and check the Sum and Output Amplifier If the amplitude display is faulty see Output Amplifier Check and Voltmeter Check 7 On the Audio Analyzer key in the Special Functions listed in Table 8B 10 For each setting key in the first frequency set RATIO off if on and after settling note the displayed amplitude Then press RATIO to establish ratio reference Key in the other two frequencies and after settling note the relative amplitude levels should be within the limits indicat
360. rload Detector senses the output of the Output RMS Average Quasi peak Detector If the output exceeds 3V the gain of the output path is set to 0 dB The state of the output can also be read by the Controller which then takes appropriate action The SINAD panel meter is normally used only in the SINAD measurement mode when the SINAD is between 0 and 18 dB On that range since the gain of the output path is 0 dB SINAD is equal to the log of the ratio of the output of the Pre Notch RMS Detector to the output of the Output RMS Average Quasi peak Detector T he mathematical manipulation takes place in the SINAD Log Ratio Meter Amplifier The Meter Transconductance Amplifier converts the voltage at its input to a current to drive the SINAD meter If SINAD is not in the range 0 to 18 dB or if some other measurement mode has been selected the Controller either pegs the meter to full scale or switches it off via the Meter Peg Off Switch DC Voltmeter Various dc voltages are routed to the Voltmeter Input Selector switch The outputs from the Pre Notch RMS Average Detector and the Output RMS Average Quasi peak Detector are measured through Ripple Filters when measurements are made on noisy ranges The DC Voltmeter consists of the Counter the Controller and the Voltage to Time Converter The output of the Voltage to Time Converter controls one of the input gates of the Counter The voltage measurement cycle begins when the Controller gates the 2 MHz Clock in
361. roximately between 5 and 6 Vpp before adjustment The period should be approximately 1 ms 6 On the Audio Analyzer key in the SOURCE frequency and Special Functions listed in Table 8B 20 For each setting measure the waveforms at the test point indicated The peak to peak amplitude should be within the limits indicated Hint If the waveforms at 14 only are faulty check the Sum and Output Amplifier See step 8 below Hint If all waveforms are incorrect check the Sum Amplifier which should have a gain of from 5 to pin 6 of 011 and Sum Amplifier 1 Hint most of the waveforms are incorrect check the control voltages listed in Table 8B 21 If the control signals are correct measure the ac signal at the drains of FETs Q30 through Q35 at the corresponding SOURCE frequency choose 1 kHz for 53 1 SPCL The drain voltage should be 0 Vrms when the FET 15 on these signals are all correct continue on with step 7 7 On the Audio Analyzer key in 53 1 SPCL Kev in the Special Functions and SOURCE frequencies listed in Table 8B 22 For each setting measure the ac signal on the sources of FETs Q14 through 029 A signal should appear on the source unless the FET 15 off 0 Vrms should appear if the FET is on If a signal is faulty also check the control voltage listed in Table 8B 22 Hint lf an attempt is made to switch on an FET which has failed to an open state signals will usually appear on the sources of 14 throug
362. rrence under the circumstances When Service Errors are not enabled a Service Error will often map into an Operating or Entry Error when Service Errors are enabled both Service and Operating or Entry Errors are displayed sequentially Error 65 Decimal Point Fixed Too Far to the Left decimal point has been held by Special Function 4 N and the reading to be displayed is too large to fit the display This error maps into Error 10 Error 70 Cannot Count Oscillator Frequency When the Oscillator is being tuned that is when a new frequency is entered or a new measurement mode requiring tuning has been selected the frequency count is 0 See Service Sheets BD3 and BD4 This error maps into Error 19 Error 71 Oscillator Tune Abort Oscillator failed to tune after three attempts See Service Sheet BD3 This error is identical to Error 18 Error 72 AC Input Overload with input Range Hold For all measurements except dc level the Input Overload Detector has tripped while the input level range has been held with Special Function 1 N See Service Sheet BD2 This error maps into Error 30 Error 73 Input AC Level Abort For all measurements except dc level the Input Amplifier failed to level after three attempts This would be normal for an unstable signal See Service Sheet BD2 This error maps into a display of until Error 31 appears Error 74 Output Amplifier Overload with Output Amplifier at 0 dB Gain The Output Overloa
363. rtial schematic on page 8B 116 5 and the Component Locator on page 8B 118 3 2730A to 2813A for HP8903B and 2730A to 2814A for HP8903E On the A4 schematic e SS7 Change the A4 board part number 08903 60128 to 08903 60183 Quasi Peak On the Component Locator e A4 Use the partial component locator on page 8B 114 3 In General information Add the following notes NOTE 5 When in 5 7 Special Quasi the AVG RMS line is high NOTE 6 Unused gates U29C and U29D have their inputs and outputs grounded On the Component Coordinates e R211 Use the partial component coordinates on page 8B 114 3 6567 14 89 8 118 1 Service 2813A and above 2816A and above for HP8903B and 2818A and above for HP8903E Model 8903B E CHANGES On the A13 schematic e 08903 60292 Change the part number of the A13 POWER SUPPLY AND MOTHERBOARD ASSEMBLY from 08903 60192 to 08903 60292 On the A4 schematic e In the upper left hand corner of the schematic change the A4 board part number 08903 60183 to 08903 60283 Note The 08903 60282 is a direct replacement for the 08901 60128 for CPC The 08903 60282 and the 08903 60283 are identical except for the positioning of W1 see schematic partial on page 8B 116 5 and the Component Locator on page 8B 118 3 On the Component Locator e 4 Use the new component locator on page 8B 118 3 for serial prefixes 2816 and above 8903B and 2818A and above 890
364. s eui 2048 x Clock Counter Carries Count of Clock Counter The count sequence is also timed out to prevent hang up of the instrument should there be no input signal or should the signal be interrupted during a count cycle During a voltage measurement cycle only the Clock Counter is used The Controller first sets the Clock Counter Gate to receive the signal from the Voltmeter Gate and closes the Voltmeter Gate The Controller had also previously closed the Stop Count Gate by deactivating the Voltage to Time Converter via the Ramp Gate line The 2 MHz Clock is now routed into the Clock Counter After a time interval which is proportional to the dc voltage being measured the Voltage to Time Converter opens the Stop Count Gate The accumulated count is proportional to the dc voltage at the input of the DC Voltmeter Controller and Remote Interface The Controller plavs a kev role in governing the instrument operation The Microprocessor in the Controller outputs information to configure the instrument reads back vital status information to prevent invalid measurements and services interrupts from the Keyboard or Remote Interface Information from the Input Output I O port of the Microprocessor is carried to the rest of the instrument by the Instrument Bus Typically the data on the Instrument Bus are decoded by the Decoders and Latches and distributed to the appropriate circuit For the Counter Keyboard and Display and Remote In
365. s filter DIFF AMPL differential HR iiri hour used in amplifier parts list dV vss ert RET division HV das high voltage double pole HZ i e cree EAS Hertz double throw IC Loa y sa ss integrated circuit DR ers sie drive ID oversees inside diameter OSB double sideband intermediate DIE uiis diode transistor frequency logic IMPG impregnated DVM digital voltmeter incandescent ECL Sons emitter coupled INCID include s logic INP input electromotive force INS insulation NOTE abbreviations in the parts list will be in upper case Replaceable Parts integrated circuit microcircuit electron tube voltage regulator breakdown diode cable transmission path wire crystal unit piezo electric or quartz tuned cavity tuned circuit INT DSL SEES CES internal KO kilogram KHZ coru vex erri kilohertz Let kilohm Li relay kilovott pound LO niae essa inductance capacitance LED light emitting diode d gl low frequency E e T tong left hand LIW y cr lirnit LIN linear taper used in parts list LK WASH lock washer LO low local oscillator LOG 222 x93 logarithmic taper used in parts list lOg logarithm ic LPF low pass filter LV seo rata low voltage IW occ meter distance MA Si eorr ERU milliampere MAX
366. s re placed with a number that indicates the number of states 5 CNTR 10 CNTR etc 8 26 Model 8903B REG SREG ROM RAM Gm Vm mAm ENm SCHEMATIC SYMBOLOGY AND SCHEMATIC DIAGRAM NOTES Table 6 6 Schematic Diagram Notes 7 of 11 DIGITAL SYMBOLOGY REFERENCE INFORMATION Sequential Logic Functions Cont d Register Array of unconnected flip flops that form a simple register or latch shift Register Array of flip flops that form a register with internal connections that permit shifting the contents from flip fiop to flip flop Read Only Memory Addressable memory with read out capability only Random Access Memory Addressable memory with read in and read out capability Dependency Notation Control Dependency Binary affecting input used where more than a simple AND relationship exists between the C input and the affected inputs and outputs used only with D type flip flops Gate AND Dependency Binary affecting input with an AND relationship to those inputs or outputs labeled with the same identifier The m is replaced with a number or letter the identifier OR Dependency Binary affecting input with an OR relationship to those inputs or outputs labeled with the same identifier The m is replaced with a number or the letter the identifier Address Dependency Binary affecting inputs of affected outputs The m prefix is replaced with a number that differentiates
367. signal against a reference If any detected level exceeds a reference the output of the detector goes low and resets flip flop A7U14 on the Latch Assembly A7U14 also sets the gain of all input circuits up to and including the Programmable Gain Amplifier to minimum gain without intervention of the Controller A7U15B when enabled inverts the output of A7U14 The output of A7U14 is across the least significant bit of the readback data line of the Instrument Bus In the normal measurement cycle the Controller reads the status of the Input Overload Detector by enabling A7U15B and reading its output and takes corrective action if A7U14 has tripped At this point in the discussion a more detailed description of the Instrument Bus data lines is needed Data d is sent out from the I O port of the Controller to the Instrument Bus through buffers TTL inverters However data is read back to the I O port directly bypassing the buffers An I O port outputs a low by actively pulling the line to ground It outputs a high by allowing the output to be passively i ENIMS NA IET rev 20JUN87 8 9 Service Model 8903B Ru E NGC EE ZU Cc CC CCP NCMO M sss C car M S n pulled up by an external pull up resistor When a Controller I O port inputs data from other circuits of the Audio Analyzer these circuits must operate against the pull up resistor Readback devices
368. sistors and capacitors have a bandpass response U9 on the A2 Input Amplifier Assembly see Service Sheet 2 and its associated resistors and capacitors have a high pass response R8 and C5 is single pole passive low pass filter CiO and R14 is a single pole passive high pass filter R4 adjusts the overall filter gain Some filters such as the Weighting Filter have a resistor R15 which increases the sensitivity of the Input Range Detector See Service Sheet 2 8B 24 Model 8903 Service TROUBLESHOOTING SERVICE SHEETS 2A AND 2B TROUBLESHOOTING Begin troubleshooting the Weighting Bandpass and High Pass Filter Assemblies by performing the Weighting Bandpass and High Pass Filters Check on Service Sheet 2 If the passband gain is faulty check the input offset on the individual ICs on the filter assembly using the following guidelines Note that A2U9 is part of a filter stage It lies behind A2A1 but can be probed from the circuit side or if desired A2A1 be move to the position of A2A2 while A2U9 is checked See Service Sheet 2 a Where bias voltages are shown on the schematic diagram the dc voltage should be within the limits shown b Where bias voltages are not shown on the schematic diagram the differential offset voltage at between the input pins should be within 15 mVdc c If the offset exceeds these limits check the polarity of the output of the IC If the polarity corresponds with the polarity
369. source in working properly Equipment Oscilloscope 45v verus V 204 5 ROS HP 1740A lt 7 1 gt Attenuators Amplifiers and Low Pass Filters Check 1 On the Audio Anlayzer key 41 0 SPCL to initialize the instrument Set the INPUT and OUTPUT switches to ground Key in AMPTD 100 mV Key in 1 11 SPCL to set the input gain to 0 dB Connect the HIGH OUTPUT to the HIGH INPUT 2 Connect a high impedence ac coupled oscilloscope to A3TP7 OUT Increment the Audio Analyzer s SOURCE amplitude for exactly 300 mVpp on the oscilloscope Hint The amplitude at 7 before adjustment should be between 260 and 300 mVpp The period should be approximately ms If the signal is faulty see Service Sheet 3 and check the Notch Filter 3 Connect the oscilloscope to A4TP8 1 On the Audio Analyzer key in the Special Functions listed Table 8B 24 For each setting the amplitude of the signal observed on the oscilloscope should be with in the limits indicated If the signal is faulty also check the control signals indicated Table 8B 24 Level at A4TP8 gt Step 3 Special Level at Level TTL at U21 Pin Function A4TPB mVpp 1 8 16 _ 3 1 140 to 160 H L L 3 3 1400 to 1600 L H H Hint Amplifier should have a gain of 5 4 Connect the oscilloscope to A4TP6 AMP 2 On the Audio Analyzer set the LOW PASS FILTER to 80 kHz 30 kHz and all off For each setting the waveform should have an amplitude betwe
370. t 4 and check the Notch Amplifier 10 Press RATIO twice to establish a new ratio reference Key in 44 1 SPCL to set the Notch Filter to the notch mode The amplitude display should be less than 2596 If faulty see Service Sheet 3 and check the Sum and Output Amplifier 11 Remove the ground from A3TP3 and connect the oscilloscope dc coupled to it instead On the Audio Analyzer key in FREQ 800 Hz The waveform should be a dc voltage between 4 0 and 4 6 Vdc If faulty see Service Sheet 4 and check the tune control circuits 12 On the Audio Analyzer key in 1 2 kHz The waveform should be between 4 6 and 4 0 Vdc If faulty see Service Sheet 4 and check the tune control circuits 13 On the Audio Analyzer key in 1 kHz The waveform should be between 1 and 1 Vdc If faulty see Service Sheet 3 and check the Sum Amplifier 2 and Service Sheet 4 and check the Tune Multiplier rev 20J UN87 8B 11 Service Model 8903B 14 Remove the ground from A3TP4 The amplitude display should read 1 or less If faulty see Service Sheet 3 and check the Sum Amplifier and Service Sheet 4 and check the balance control circuits 15 On the Audio Analyzer key in 41 0 SPCL Key in AMPTD 3 V Press DISTN The amplitude display should read 0 01 or less If the level is slightly out of limit perform the Notch Filter Tune and Balance Adjustment paragraph 5 12 Otherwise the Notch Filter is functioning but the automatic tuning sequence is faulty See
371. t Range Detector output is measured by the DC Voltmeter and sets the input gain The gain of the detector is programed to match the peak gain of the Weighting Bandpass Filters that follow the Programmable Gain Amplifier The output of the Input Range Detector and the dc at the input of the Programmable Gain Amplifier are compared to positive and negative references by the Input Overload Detector This is to determine if the signal levels are too large for the input gain settings The output of the Programmable Gain Amplifier can be filtered with optional audio filters either a 400 Hz High Pass Filter or one or two of several Weighting Bandpass Filters All are active filters The 400 Hz High Pass Filter is a 7 pole filter The Weighting Bandpass Filters are designed to match certain international standards filters plug onto the A2 assembly rev 20J UN87 8B 1 Service Model 8903B Table 8B 2 Gain Summary for AC Measurements Differential Programmable to Single Gain Ended Amplifier Amplfier Special Function Input Attenuator O O O O Notch Filter A3 The input to the Notch Filter is measured by the Pre Notch RMS Average Detector The measured level is used as the denominator in the distortion calculation and the numerator in the SINAD calculation Its
372. t Voltage with Filter See Service Sheet 1 Input Range Detector See Service Sheet 2 NOTE The suffix can also be two digits XY The difference 49 X SPCL 49 Y SPCL is then displayed For example 49 3 SPCL or 49 30 SPCL gives a display of the Output RMS Average Quasi peak Detector with Ripple Filter with respect to ground 49 34 SPCL gives a display of the difference between the Output RMS Average Quasi peak Detector with Ripple Filter and the same detector without the Ripple Filter 50 N Display Oscillator Frequency The frequency of the Oscillator is displayed in the left display all measurement modes except dc level and where a valid measurement cannot be made The right display operates as usual Resolution is the same as it would be if it had been an input signal N 0 Display frequency as normal N 1 Display Oscillator frequency 52 N Read Only Memory Verification The Controller displays the checksum of the read only memory ROM specified by When specifying a ROM use N 1 through 10 The display is in the form actual checksum in the left display and expected checksum gt in the right display Both displays should show 0 for ROM 10 See Service Sheet 16 Serial Prefix 2652A and Above ROM consolidation does not change this Verification 53 N Notch Filter Frequency Range Permits the frequency range of the Notch Filter to be displayed or manually set If no suffix is keyed in that is 53 SPCL the current N
373. t and through out the manual Table 6 3 lists all replaceable parts in reference designator order Table 6 4 contains the names and addresses that correspond to the manufac turer s code numbers 6 2 ABBREVIATIONS Table 6 2 lists abbreviations used in the parts list schematics and throughout the manual In some cases two forms of the abbreviation are used one all in capital letters and one partial or no capitals This occurs because the abbreviations in the parts list are always all capitals However in the schematics and other parts of the manual other abbreviation forms are used with both lower case and upper case letters 6 3 REPLACEABLE PARTS LIST Table 6 3 is the list of replaceable parts and is organ ized as follows a Electrical assemblies and their components in alphanumeric order by reference designation b Chassis mounted parts in alphanumeric order by reference designation c Mechanical parts The information given for each part consists of the following a The Hewlett Packard part number b Part number check digit CD total quantity Qty for the entire instrument except for option assemblies See following note d The description of the part e typical manufacturer of the part in a five digit code f The manufacturer s number for the part NOTE The total quantity for each part is given only once that is at the first occurrence of the part number in the list
374. t being driven Thus when in Listen Only this display will always show 0 for lt DAV gt The lt RFD gt and DAC always track the bus lines Ready For Data and Data Accepted For example 1 for lt RFD gt means line Ready For Data is true high Displays 0 in the left display and lt gt lt gt in the right display This function reads back and displays the present state of the Attention bus control line and the state of the Remote Enable Flip Flop 1 for either lt gt or REN indicates is true low at the bus or that the Remote Enable Flip Flop is set Displays 0 in the left display and lt SPM gt lt SRQ gt in the right display This function reads back and displays the state of the Serial Poll Flip Flop and the state of the SRQ bus control line as being driven by the Audio Analyzer 1 for either lt SPM gt or lt SRQ gt indicates the Audio Analyzer is in serial poll mode SPM or that it is presently driving the SRQ bus control line Displays PIO Port with the most significant bits in the left display and the least significant bits in the right display This function inputs and displays without modifying the data at PIO port A9U18 Leading zeros in both displays are blanked T he display is interpreted as shown in Table 8 4 Displays PIO Port B with the most significant bits in the left display and the least significant bits in the right display This function is similar to
375. tage equals the level of the reference input the Comparator signals the Counter to stop counting The accumulated count is proportional to the dc voltage Ground is measured before each reading and subtracted from the DC Voltmeter measurement to eliminate the effect of offsets The ramp begins at approximately 6V which permits measurement of negative voltages 8B 6 rev 20JU N87 8903 gt Service TROUBLESHOOTING General Procedures for checking the measurement circuits of the instrument are given below The blocks or points to check are marked on the block diagram by a hexagon with a check mark and a number inside for example v3 The procedures assume that the source is working properly A second audio source is needed only if distortion is out of specification and it cannot be determined whether the instrument s source or distortion measurement is at fault Before performing any check perform all the checks on Service Sheet BD1 Equipment Audio Analyzer HP 8903B or HP 339A OSellloSeODG pb Decoder ence ds HP 1740A V1 Input Amplifier Check NOTE This check does not test the Over Voltage Protection If the Over Voltage Protection is suspected to be faulty see Service Sheet 1 1 On the Audio Analyzer key in 41 0 SPCL to initialize the instrument Set the INPUT and OUTPUT switches to ground Set IMPEDANCE to 600 Key in AMPTD 3 V Connect the HIGH OUTPUT to the HIGH INPUT through
376. terface decoding of the Instrument Bus is done on the assemblies Information within the Controller itself is handled by three main buses the ROM Control Bus which coordinates the various devices which make up the Controller the Address Bus which addresses the ROM and and the Data Bus which carries information to or from the ROM and Since the Remote Interface contains some Controller devices these buses are also distributed to it 8 4 2 51 87 a ee ee 2 Model 8903B Service The Remote Interface receives inputs from the external interface bus HP IB processes the information and interrupts the Controller in a manner similar to the Keyboard It also processes the measurement information and outputs it on the HP IB if requested The Remote Interface is designed to make operation from an external computing controller as similar as possible to operation from the front panel Instrument Software Supervisor Flowchart The instrument s software is structured in a form called the supervisor See Figure 8A 1 The supervisor is a loop that is continually traversed with displays made near the end after checks for oscillator tuning input and output leveling notch tuning and measurements Arithmetic manipulation for example for the ratio function follows the measurement and the programs loop back to the beginning after outputting to the display The various level and tune blocks verify that the instrument
377. tes T Toggle Input When active causes the flip flop to change states 5 Set Input When active causes the flip flop to set Reset Input When active causes the flip flop to reset J J Input Analogous to set input K K Input Analogous to reset input D Data Input Always enabled by another input generally a C input see Dependency Notation When the D input is dependency enabled a high level at D will set the flip flop a low level will reset the flip flop Note strictly speaking D inputs have no active or inactive states they are just enabled or disabled m Count Up Input When active increments the contents count of a counter by m counts m is replaced with a number Count Down input When active decrements the contents count of a counter by counts is replaced with a number Shift Right Down Input When active causes the contents of a shift register to shift to the right or down m places m is replaced with a number m Shift Left Up Input When active causes the contents of a shift register to shift to the left or up m places m is replaced with a number NOTE For the four functions shown above if m is one it is omitted Functiona Labels The following functional labels are to be used as necessary in symbol build ups to ensure rapid identification of device function mCNTR Counter Array of flip flops connected to form a counter with modules m m i
378. that a parameter other than 0 may be required to complete the Special Function Code See Table 8 1 for entry of hexadecimal suffixes 40 0 Controller Reset Initializes the Controller to its power up state Because this disturbs the HP IB hardware it is unavailable from HP IB gives Error 24 The power up sequence is discussed in paragraph 8 27 41 0 Controller Clear Initializes the Controller to its power up state but bypasses the operational checks see paragraph 8 27 Leaves HP IB hardware unaffected but clears any service request message SRQ being issued by the Audio Analyzer sets the service request condition to its power up state and clears all bits in the status byte 42 0 Display Software Date Displays the date of the software in the form month of year gt lt day of month in the left display and year in the right display 43 N Service Error Display Control Service Errors are numbered 65 to 95 Refer to paragraph 8 26 N 0 Disables display of Service Errors N 1 Enables display of Service Errors N 65 to N 95 quad Enables display of only the Service Error specified by N Operating and Entry Errors remain enabled 44 N Notch Filter Mode Select Permits manual selection of one of three configurations of the Notch Filter N 0 Notch Filter mode selected automatically as required by the measurement mode N 1 Notch Filter in notch mode N 2 Notch Filter in flat mode N 3 Notch Filter in bandpass mode 45 N SINAD Meter Enabl
379. that are read out to the data lines such as A7U15B are similarly configured A7U15B has an open collector TTL output When it outputs data a low is produced by switching the output device to ground high is produced by switching the device off and allowing the output to be passively pulled up The readback lines are low true that is r 1 when the line is low When A7U15B is disabled enable is low the output is high inactive and has no effect on the data line A7U15B is enabled by Direct Control Special Function 0 704 The value of d is arbitrary to enable A7U15B but the least significant bit must be 0 that is d must be even to switch off the output device of the I O data port P O A INPUT AMPLIFIER ASSEMBLY PROGRAMMABLE GAIN AMPLIFIER FROM DIFFERENTIAL TO SINGLE ENDED 1 WEIGHTING BP AMPLIFIER FILTERS INPUT DETECTOR INPUT OVERLOAD DETECTOR OTHER INPUTS LEAST SIGNIFICANT BIT TO CONTROLLER Figure 8 5 Example Showing Input Overload Detector Readback To clarify this suppose that A7U14 has not been reset If Direct Control Special Function 0 700 is entered the displays will show 0000 0000 The second four digits are 0000 because d 0 was received by the Controller from the keyboard and issued to the Instrument Bus The un reset flip flop puts a low on the input of A7U15B and an inactive high on the least significant data line This is read by the Controller as r 0 and thus is the same as the bit issued
380. the Input Range Detector 16 If the Audio Analyzer has the CCIR Weighting CCIR ARM Weighting or Weighting Filter key in the filter The dc voltage should be within the limits given in Table 8B 9 If faulty see Service Sheet 2 and check the Input Range Detector and the respective Weighting Bandpass Filter Table 8B 9 Amplitude Limits at A2TP2 71 Step 16 Amplitude Limits divisions Weighting Filter CCIIR WEIGHTING 0 9 151 WEIGHTING 5 1 5 4 WEIGHTING 3 0 3 2 Reduce the oscilloscope s vertical by 10 17 Set the oscilloscope for 2 V division On the Audio Analyzer set the Weighting Bandpass or High Pass Filter off Key in 1 12 SPCL Key in AMPTD 5 1 V The voltage displayed on the oscilloscope should be approximately rev 20JUN87 8B 9 Model 8903B 8 1 Vdc Ignore the display If faulty see Service Sheet 2 and check the Input Range Detector and Input Overload Detector 18 On the Audio Analyzer key in AMPTD 5 5 V The voltage should drop to approximately 0 Vdc display should show Error 30 If faulty see Service Sheet 2 and check the Input Range Detector and Input Overload Detector 19 On the Audio Analyzer press AUTOMATIC OPERATION Press S Shift DC LEVEL Key in 2 3 SPCL to set the dc level range to 16V Connect the oscilloscope to A2TP5 SING END 20 Connect A8TP16 5V to the LOW INPUT The oscilloscope should show a dc voltage
381. the repeatability of the voltmeter If faulty also check the logic level of the pins indicated Hint If the selector has a failure in which one input is always connected to the output pulses will usually appear on the faulty input when another line is slected Use Special Function 49 N to select the lines lt 43 gt Voltage to Time Converter Check 1 Measure the anode of VR4 with dc voltmeter The voltage should be between 6 51 and 5 89 Vdc 8B 51 1 Model 8903B TROUBLESHOOTING SERVICE SHEET 7 Table 8 28 Voltmeter Input Selector Check lt Z2 gt Step 2 Direct Control Check Level TTL at U18 Pin Special Voltage at 4 Ir pt I or r rrr A 3 Vrms ac signal should appear here also A 1 2 to 1 5 Vrms signal should appear here also if the SOURCE frequency is set to 20 Hz 2 On the Audio Analyzer key in 41 0 SPCL to initialize the instrument Set the INPUT and OUTPUT switches to ground Key in AMPTD 3 V Key in 1 11 SPCL to set the input gain to 0 dB Key in 49 1 SPCL to set the voltmeter to measure the Input Range Detector Connect the HIGH OUTPUT to the HIGH INPUT 3 Connect a high impedance dc coupled oscilloscope to A4TP7 RAMP The waveform should be as shown in Figure 8B 35 Hint The slope of the triangles in the waveform should be approximately 1 V ms Hint Pin 14 of U19C should be as shown in Figure 8B 36 If it a
382. to the Clock Counter Counting proceeds until the Voltage to Time converter produces a Stop Count pulse which opens the Stop Count Gate The time lapse between the gating of the clock and the opening of the Stop Count Gate is proportional to the dc input voltage The count thus accumulated during the interval is proportional to the input voltage Source The source consists of a 10 Hz to 100 kHz Oscillator and output level setting circuits Oscillator tuning is programed by the Controller which uses the Counter to check frequency The Oscillator output is self leveled to about 3 Vrms via an automatic leveling control ALC circuit The circuit senses the level with a peak Level Detector The output from the detector is compared against a dc reference voltage by the Level Error amplifier The output of the amplifier drives the level varying circuitry in the Oscillator to eliminate the error condition The amplifiers and attenuators in the output path are e Amplifier 1 an active attenuator with a gain of 0 to 6 dB settable in 256 steps e Amplifier 2 an active attenuator with a gain of 0 to 17 5 dB settable in 2 5 dB steps e Attenuator a passive attenuator with 0 20 and 40 dB attenuation e Output Amplifier Driver a non programmable buffer with gain of 1 9 5 58 dB e Floating Output Amplifier with a gain of about 1 dB and e Attenuator a passive attenuator with 0 or 20 dB attenuation In the signal to noise ratio measurement
383. tor signaling device audible or visual lamp LED Sua v Rd RR ampere alternating current ACCESS accessory ABI adjustment AID vies isa analog to digital cat nantes audio frequency BEG vL Lx Wes automatic frequency control AGO oo acs automatic gain control Ab 2 xs aluminum ALG 4 een eas automatic level control AM amplitude modulation amplifier APC automatic phase control ASSY les uus assembly AUX auxiliary AVG AWG American wire gauge BAL e prr VERAS balance BCD usus binary coded decimal BD board BECU 4 1245 beryllium copper BFO beat frequency oscillator BH iuvenis binder head BKDN breakdown BP uude PEE ERR bandpass BPF bandpass filter BRS brass BWO backware wave oscillator CAL vui EUR NAA calibrate COW runs counter clockwise ebbe Iss ceramic CHAN channel EM o centimeter CMO cabinet mount only COAX coaxial Table 6 1 Reference Designations REFERENCE DESIGNATIONS miscellaneous electrical part circulator electrical connector stationary portion coil inductor miscellaneous mechanical part electrical connector movable portion transistor SCR triode thyristor FET thermistor transformer terminal board thermocoupie test point Table 6 2 Abbrev
384. tput Amplifier gain and Special Function 3 N is in automatic selection See Service Sheet This error maps into a display of until Error 31 appears Error 80 Cannot Count Oscillator Frequency in SINAD When the Oscillator is attempting to tune to the frequency of the Notch Filter the frequency count is 0 See Service Sheets and BD4 This error maps into Error 19 Error 81 Cannot Count Input Frequency The input frequency cannot be counted in ac level distortion distortion level or signal to noise measurement modes See Service Sheet BD2 This error maps into Error 13 Error 82 Notch Filter Does Not Null Notch Filter does not null after three attempts This would be normal for an erratic signal See Service Sheet BD2 This error maps into Error 13 Error 83 Cannot Count Input Frequency After sensing the presence of a signal the count is 0 This would be normal when the input signal is filtered by the High Pass and Weighting Bandpass Filters See Service Sheet BD2 This error gives rise to a display of 0 00 Hz Error 84 Output Amplifier Overvoltage with No Overload The Output RMS Average Quasi peak Detector senses an overvoltage the Output Amplifier gain is 0 dB but the Output Overload Detector has not tripped See Service Sheet BD2 This error maps into a display of until Error 31 appears Error 85 Period of the Voltage to Time Converter 0 Counter receives no pulses from the Volta
385. tput from exceeding 12 or 12V The output from Amplifier 1 drives the Low Pass Filters and the Notch Filter tune and balance circuitry see Service Sheet 4 Amplifier 4 drives the MONITOR output connector and is protected against the application of reverse voltage by R53 which acts as a fuse CR8 and CR9 AI2LI and form an RFI filter Filters The three Low Pass Filters are 30 80 and 750 kHz three pole active Butterworth filters The passband gain of each filter is 2 The active element of the filter U8 has an Output Clamp similar to U6 and U13 The filters are switched U9 The two High Pass Filters are respectively a 0 3 Hz single pole passive filter and a 13 Hz three pole active filter Switching is suppresses the inductive transient created by the coil of when the current is interrupted 8 39 Service Model 8903B TROUBLESHOOTING SERVICE SHEET 5 TROUBLESHOOTING General Procedures for checking the Output Amplifier Voltmeter Assembly are given below The circuits or points to check are marked on the schematic diagram by a hexagon with a check mark and a number inside for example In addition any points outside the labeled circuit area that must be checked are also identified Fixed signals are shown on the schematic also inside a hexagon for example lt 1 9 TO 42 1 VDC gt Extend the board assembly where necessary to make measurements These procedures assume that the
386. ttenuation are summarized in Table 8B 1 for dc measurements and Table 8B 2 for ac measurements Table 8B 1 Input Attenuation for DC Measurements DC input Level Range Input Attenuation Range Vdc Special Function dB 4 2 4 0 16 2 3 12 64 2 2 24 300 2 1 40 The Over Voltage Protection circuit clamps the high and low inputs of the Differential to Single Ended amplifier when the signal level exceeds 13 T he diodes of the protection circuit are in parallel with the signal path and are normally biased off amplifiers ac couple signal to the clamp diodes to prevent the signal from modulating the diode capacitance and creating distortion The output of the amplifier is also fed to the Input Overload Protection The signals on the high and low paths are each amplified by programmable gain amplifiers The outputs from the two amplifiers are subtracted to create a single ended signal that is one that is referenced with respect to ground The gain of the Differential to Single Ended Amplifier is 0 8 16 or 20 dB The gain is 0 dB when measuring dc The gain for ac is summarized in Table 8B 2 DC measurements are made at the output of the Differential to Single Ended Amplifier by the DC Voltmeter The Programmable Gain Amplifier has a gain of 0 4 8 or 12 dB The gain is summarized in Table 8B 2 The amplifier input is ac coupled The rms level at the output of the Programmable Gain Amplifier is converted to dc by the Inpu
387. tude displayed on the oscilloscope should be within the limits indicated If faulty see Service Sheet 1 and check the Differential to Single Ended Amplifier rev 20J UN87 8B 7 Service Model 8903B Table 8B 5 Amplitude Limits at A2TP5 71 Step 5 Total Change Amplitude Limits divisions pk pk Special in Oscilloscope Function Vertical Gain Amplitude Limits divisions pk pk Special Function 1 15 1 2 1 3 1 17 3 0 3 3 1 19 4 8 5 2 8 On the Audio Analyzer key in 1 11 SPCL On the oscilloscope set the gain back to x1 Check that the waveform is still 5 divisions peak to peak 9 Connect the oscilloscope to A2TP4 PGM AMP On the Audio Analyzer key in the Special Functions listed in Table 8B 7 For each setting decrease the oscilloscope s gain by the amount indicated The peak to peak amplitude displayed on the oscilloscope should be within the limits indicated If faulty see Service Sheet 2 and check the Programmable Gain Amplifier Table 8B 7 Amplitude Limits at A2TP4 71 Step 9 Total Change Amplitude Limits divisions pk pk Special in Oscilloscope Function Vertical Gain 10 On the Audio Analyzer key in 1 11 SPCL On the oscilloscope set the gain back to x1 Check that the waveform is still 5 divisions peak to peak 11 Connect the oscilloscope to A2TP3 OUT The oscilloscope display should be between 4 9 and 5 1 divisions peak to peak If faulty see Service Sheet 2 and check the
388. ubleshooting an instrument fault The functions available are quite diverse and include special internal measurements software control and special service tests and configurations Safeguards are generally relinquished 8 22 Direct Control Special Functions Prefix 0 Communication between the instrument s Controller and its hardware is via the Instrument Bus During normal instrument operation the Instrument Bus carries measurement results status information and commands which control hardware The Direct Control Special Functions halt the bus activity and send out commands as determined by the code suffix One command is sent for each Special Function entry Direct Control Special Function Code Format The Direct Control Special Function code is in the form 0 where 0 is the prefix which may be omitted and esd represents a three digit hexadecimal number The significance of esd which stands for enable select and data is discussed in the Principles of Operation for Service Sheet BD4 Specific direct control codes are given in the Troubleshooting section of the individual service sheets As the Direct Control code is entered the code will appear on the left display Pressing the SPCL key initiates the Special Function The displays will then be in the form rrrr left display and wwww right display where each digit represents a binary bit 1 or 0 The rrrr is the d data read back from the Instrument Bus The wwww is the d
389. upelate information Factory Selected Component Refer ta 2 A Errata poi rhange 6 38 rcv JGFEB90 Model 8903 Reference Designation A4 A4R42 A4R43 A4R44 A4R45 A4RA46 A4R47 4948 4849 4850 4951 A4R52 A4RS3 A4R54 4 55 A4RS6 4957 4858 4 9 A4F60 A4R61 A4R62 A4R63 4864 4955 4966 4967 4968 A4R69 A4R70 4 71 4972 4973 A4R74 A4R75 A4R76 A4R77 A4R78 4979 A4R80 4 81 4882 4883 A4PB4 4885 A4R86 A4R87 4 88 4889 A4R90 A4R91 HP Part Number 08903 60128 SERIAL PREFIX 2450A TO 2720A HP8903B 0698 3151 0757 0447 0698 3151 0698 6343 0698 6362 0757 0422 0698 6343 0698 6343 0698 6362 0698 6362 0757 0280 069 0550 0698 0085 0698 6360 0658 3160 0698 3160 0757 0280 0757 0433 0757 0442 0698 3152 0698 6360 0698 8822 0757 0465 0757 0438 0698 3150 0698 3153 0757 1108 0757 0279 0698 6530 0698 6360 0757 1094 0698 3136 0757 1094 0757 0401 0698 8822 0698 8822 0698 0084 0757 0440 0757 0442 0757 0442 0757 0438 0698 3157 0757 0280 2100 3094 0698 3223 0698 3459 0757 0280 0757 0438 0699 0526 2100 3055 C D 7 4 7 5 8 O O O O OC D Ow on OW DO o0 m m XQ ut m BOW Q Qty A Refer to Section 7 for information rev 16FED90 Tuble 6 3 Replaceable Parts Description Mfr Code RESISTOR
390. y related to the magnitude of the voltage by the Voltage to Time Converter The pulse length is then measured by the Counter see Service Sheet 14 The converter consists of the Comparator Ramp Generator and Reference The Reference supplies a voltage of controlled temperature co efficient to the input to the Ramp Generator The basic reference is the temperature stable reference diode VR4 The reference is fed from the current source Q10 which itself is temperature stable because its base emitter junction and its reference VR3 have similar thermal behavior The negative reference supplies current to the inverting input of U15 through R125 and R127 CR25 R123 and R124 add slight temperature coefficient to the current to cancel the effect of the temperature coefficient of C70 The DC Voltmeter sensitivity is adjusted by means of R125 015 with C70 integrates the negative input current to produce an increasing ramp The ramp is generated only when Q9 is off for example when RAMP GATE L is low This is initiated by the Controller When Q9 is on the voltage across VR5 appears across C70 This clamps the output of U15 at approximately 6 2V The current for Q9 is supplied by current source Q12 When Q9 goes off the ramp begins starting at 6 2V The ramp begins when the RAMP L line goes low The output of comparator U20 at this time is high because the voltage at its non inverting 4 input is higher than the invertin

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