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657xA-667xA Service Manual

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2. D902 TO HEATSINK TO E900 55 amp 60U MODELS ONLY NOTE THIS PART IS USED ON THE 120U UNIT ONLY i reum SNUBBER BD W900 W901 1244 1744 0402 Fa05 2911 913 TS Va Eie as E1 61 MI OMe HI 022 250V FH NOT 77 LOADED L901 3 7UH L902 3 7UH e a OUT BUSBAR W918 W920 gt TO 300 R 197 0 DEGREES 0 DEGREES Sis FET BD TB201 lt lt C90z p209 R317 pne 2000 C906 1 B1 2 PINS 1 4 DAC 759 7000 5 sx E900 OUTPUT STUDS CAS 7 047 TO L903 7 H 1000 5 4 598NH US 1 N C PINS 5 8 7 NC N C M YY 910 x W914 S 1900 OU 1 0 t XXX 9 5 4 DUT BUSBAR Sram Seeds e DPS 1 T200 LOCATED R904 2 R903 C914 ON OUTPUT R906 R908 9001 SUB CHASSIS T 10 10 42 2 7M E En z x 1000PF 5x Ls W313 WO17 u 3 174W 174W PAW 1 ab J900 12 OUT kta IA 0 DEGREES 4900 11 W912 aspas DPS 0910 C912 5 V L fYYYY2 wp ll 1 2 amp 0
3. 5U 50 ji 5 50 R27 2R30 R29 2ReB 047 2 2 1 4 64K 4 64K 4 64K 4 64K 5 R37 HICO HIC 1 HIC2 HIC id cts elel7 s 4 s e Gt 7411 SU 1 1 2 HI 3 047 3 5 4 HIC 04 5U 3 5 RPG SHIELD ucc2 gt 5U 23 11 aco 4 as See EO MTG 50 8 i 45 1 a Q Paps 5 2 HIO C7 15 00 5 521 3 j anan tto a 6 acs G2 HICO 047 eos 18 85 5 1 500 ETT aj 8 62 L1 04 A7 B 0 5 _ 201 29 ace 2 a os 28 anc 22106 99 24 C17 aD 07 10 22 A10 3 aii 22 12 3 1 2 4 57 2 2 SU 36 V6 me Aci T LCD DISPLAY MTG GUARDING 5L 200 N C 1 30_ PADS 5 56 2 UPP 1 pu 12 5 5 i Le 042 16m Du 2 lt T V 270256 E3 J2 6 9 8 12MHZ 1 9 HO 3 5 10 Olay Bree 2 V 3 12 54 ER 2 1 2 HO 13 14 gt gt 66 ra 40 zy Hoco 15 16 1000 1600 RD ADC 0 7 sss 9 HS05 I3 AC0 14 g o HSO1 C14 5Ve 047 1 8 ES shu S42 1 9 1 Jeu 115 y AD 7 2 4p 10 19 ance 3 sp 2048 ace 1 vee 8 ADCS 5 09 9 qp 49116 4 1 le R25
4. m tS IM 35 error code hs 35 35 35 lp 35 D es 35 BS gas E aaa E Re NUES 35 de yet bs ORE ches 35 35 A 35 BT 3s ut ES tbe one aes eee e a OE 35 ten oi poe eR PR UE 35 EO esse E 35 error code OV Els GPIB NEMUS I IM 34 error code selftest OU EPIRI 35 error message CAT DENIED cC R R E E E R E E E N E ERE 67 DACS Sage eed MAA A Sha a ees 35 EE CHKSM ates ities eR ele ae Retin oe tie Ben 35 EE WRITE ERR ee ueneno e ene e Don DR REED IHR DD 35 MP 35 FP ROM EE 35 eue Ee ea Dee 35 GPIB 35 PASSWD ERROR UI RR eise diretti 67 PRI IRAM eed oC RA de RI ER cine TS eres 35 5 ene Pe eR ie Ee A EIS 35 en 35 NIB RUD de EEEE EAE O rr EEE 35 SBUF OVERRUN 2243
5. Replaceable Parts 87 Table 5 3 Main Chassis Replaceable Parts continued Ref Desig Agilent Part No Description ELECTRICAL PARTS continued T900 Transformer power output Model specific 6571A 6671A 9100 4909 6572A 6672A 9100 4946 6573A 6673A 9100 4945 6574A 6674A 9100 4910 6575A 6675A 9100 4944 N 22222222 1 tA z 6571A 6671A 6572A 6672A 6573A 6575A 6673A 6675A 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A CABLES see Figure 6 2 5080 2172 Cable assy 4 wire 151 to A4 AC Input bd 8120 4944 Cable ribbon front panel display AIDSP1 5080 2166 Cable ribbon A4 AC Input bd to A5 Control bd 5080 2167 Cable phone 2 GPIB bd to A5 Control bd 5080 2168 Cable phone A2 GPIB bd to Front Panel bd 5080 2169 Cable assy 2 wire A2 GPIB bd to A4 AC Input bd 5080 2170 Cable assy 2 wire A3 FET bd to A5 Control bd 5080 2171 Cable assy 2 wire A3 FET bd to A4J400 on A4 AC Input bd 5080 2178 Cable assy 2 wire A3 FET bd to rails on A4 AC Input bd CHASSIS MECHANICAL 0960 0912 Optical Encoders Voltage and Current Controls 5063 2304 LCD Display 5040 1665 Keypad 3101 3088 AC ON OFF line switch 5040 1675 Bezel output 1510 0107 Binding post rear panel gnd post 5001 6740 Bracket GPIB 5040 1673 Bracket polycarb 5001 6766 Bracket A7 Snubber bd 5000 6554 Bracket strap 5041 8801 Bumper f
6. YES CHECK FOR SHORT CIRCUI IN OUTPUT CHECK CURRENT CALIBRATION CHECK VOLTAGE LEVELS AT A5U612 1 AND A5U680 8 Y 47 HIGH CHECK 50502 NO NO CHECK 50612 CHECK 50680 Figure 3 5 Output Held Low Troubleshooting Sheet 2 of 2 42 Troubleshooting START OUTPUT HELD HIGH TURN OFF THE SUPPLY AND REMOVE THE COVER AND RFI SHIELD DISCONNECT LOAD TURN SUPPLY ON AND CHECK THE BIAS AND REFERENCE VOLTAGES TEST POINTS THROUGH 5 SEE TABLE 6 3 ARE NO TROUBLESHOOT THE DEFECTIVE CIRCUIT VOLTAGES SEE FIG 6 5 OK YES TURN GFF SUPPLY AND PERFORM AS CONTROL BOARD TROUBLESHOOTING SETUP TABLE 3 3 DISABLE THE OV CIRCUIT BY LIFTING ASR 91 TURN ON SUPPLY AND PROGRAM OUTPUT VOLTAGE AND CURRENT TO ZERO CHECK IF CV OR GATE DIODE 50620 15 CONDUCTING NO CHECK VOLTAGE READING ON FRONT PANEL DISPLAY NO ASD620 CONOUCTING YES CHECK VOLTAGE LEVEL AT FAST SENSE OISPLAY READS FIULL SCALE DIFF AMP 5621 1 65 VOLTAGE YES CHECK CV ERROR AMP CIRCUIT 50615 CHECK A5U621 CHECK VOLT DIFF AMP CIRCUIT ASUG 5 CHECK A5U605 Figure 3 6 Output Held High Troubleshooting Troubleshooting 43 START DAC DEFECTIVE ONE OF THE CIRCUITS IS DEFECTIVE TURN OFF SUPPLY ANO REMOVE TOP COVER TURN ON SUPPLY AND CHECK BIAS AND REFERENCE VOLTAGES TEST ONIS S THOUGH TABLE 6 39 ARE VOLTA
7. 13 24 AC 9 D 2 13 ag 24 _AC9 D gt 15 003 15 503 ato AC10 16 25 AC 11 D 4 16 004 A11 25 A 11 ocs 17 DCS 17 pa aiel D6 18 19 UCC VSS A 12 DQ6 A13 26 ACLI ai 814 RI 9108 129 gm C133 042 042 042 042 50V 50 5 U117 500 50 1000PF R107 500 R109 464 C103 1000PF 500 SECONDARY NC ISOLATION R137 FPRX 100 WN PCLR R138 R136 x1 9101 2 R135 1MHZ PCLR RI DF I_ GND 50 DFI OUT 11 U118 DFI EN t EN DFI INA OUTA OUT1 INB OUTB _ CLAMP1 20 INC OUTC 6 OUT3 IND OUTD gt 5U DS2658N 4 12113 UR101 R105 C111 18V 10M 10 042 500 C128 2200PF T1 250V Figure 6 6 A2 GPIB Board Schematic Diagram 667xA only 2 N O L211 1208 Figure 6 7 FET Board Assembly Diagram and Test Point Locations E502 RAIL O R277 lt R276 25813 oRal4 5x 5x 10W 10W D201 C202 C215 D204 lt C213 D 100PF 100PF 500V 500V L201 2200PF L213 R205 R206 p d M R231 R233 34 WIMA 10 5 75 5 4 hi
8. e ROUND A T900 LOCATED d d pr un R996 s amp ON OUTPUT D90 0 MOUNTED ON H S E 7 1900 suB CHASSIS D901 8992 AA EL SHIELDS R998 680 ET z R999 SNUBBER BD 18A 18A E6 18A D901 C XFMR LUG Figure 6 16 A6 Output Filter amp A7 Snubber Boards Schematic Diagrams 65 6673A 75A Dod mE QD 0901 U 01 9 916 O 0909 C4R933 0 0903 Qd OOO 9902 Ojo ceo ojo R917 4900 Figure 6 17 6 Output Filter 7 Snubber Boards Assembly Diagrams 65 6675 BIAS 50 R802 4 64K 5U 50 R806 4 64K TO FRONT PANEL J803 2 J802 1 J802 2 J802 3 J802 4 J802 5 J803 1 rA IHS11 50 CR802 C803 C804 jy 3 CR803 e e M3 PL M3 PL gt J802 6 J802 7 9804 0803 0805 04 02 915802 9
9. e Ie aap e IR beer iet pecie Ie reis 76 ac input filter s oa Rebeca th etek Ti ieiuna eeiam oe eed ee itte edes 78 otis oem Date pee bmp eie Don GP ER 77 heatsmk assembly 9 eter ette er eb Her t e be eese orc e 75 i ROUTER s 76 1 900 output oerte ete Ine na ite nee a hehe 76 hne SWIC Diss s eae 74 OULPULSUDCHASSIS UE 75 a a ena eo dian eesti Saw hs ea AN ean Sai 75 162 Index RFI TECH e 73 RPG controls eerte deeem dece cue u EE A bee 74 T900 output transformer endete e Diner IRURE DTE RO IRE 76 suec 73 Replaceable parts for A2 isolator board SEU nea ibi eee 97 resistor t eti ROO bet b te 16 load aite EUR IDE Satin REGI iE 16 current monltor c e er er pe n i SA suy ys 23 24 5 e 60 SA Secondary interface RU ie esta rdv s 66 SA signals A5 ER DP pO eee 66 SA signals secondary interlace 66 S A Stenatures adentical cnr er iie ead obtu e on tuus 60 SA signatures Similar o iso E dU diede Um RE ES 60 SA test header eR puna chek RERO e tet ber IO RE
10. Sheets Lect PU Let A 17 B GE UL 17 current programming and readback accuracy 18 current sink and readback accuracy testing sese nennen eren 2 8 CV C 23 SES dee chased te ue 21 CV load effect testmg an RU pe 21 Index 159 noise PARD defined 24 usu nic kta oe GA ec naut Iu nene 21 CV norse PARD testih 21 CV source effect defined a aasan Save seuss sass pH Den re PURI DER PR RUFI REIR 21 CV SOURCE etfecttestInp s EE EEEE E ponia ie eec pies eere ie e aite d 20 CV transient response waveform Lee eterne tbe Nere eri enero stas rente etre recien the 22 CV transient recovery time defined n a m enne enne nene 22 CV transient recovery time ccrte p 22 CV voltage programming and readback accuracy testing sese eene ener nee 20 D Diagram Cabling eerte e e tee ete e tc e eee tee e te e ete nte eere 131 DIG CNTI port En ERR soe E 61 disassembly procedures er UT UR e HERR Ret Eee iu 73 downprogrammer FETS location of 2 reiten 75 E electronic load aus EGG ov eae 16 23 error CHECKSUM o d
11. CHECK VOLTAGE 410 AND OR CURRENT 162 CONTROLS CABLE CONNECTIONS NO PROBLEMS FOUND PERFORM VERIFICATIONS TESTS IN CHAPTER 2 TO DETERMINE IF A PROBLEM EXISTS Pies E ad Figure 3 1 Overall Troubleshooting Sheet 3 4 Troubleshooting 35 FROM SHEET 1 PROT ANNUNCIATOR ON NO YES PRESS PROTECT KEY or YES DISPLAYED NO YES DISPLAYED oc YES DISPLAYED RI REMOTE INHIBIT DISPLAYED CHECK FOR SHORT BETWEEN A2TB101 3 AND GROUND 667xA ONLY 36 Troubleshooting FROM SHEET 2 OUTPUR VOLTAGE NEAR ov AGE RIGHT BUT OUTSIDE SPEC NO GO TO OUTPUT HELD LOW Es TROUBLESHOOTING FIG 3 6 CHECK CURRENT AMP CIRCUITS A5U612 0617 YES GO TO OUTPUT HELD HIGH TROUBLESHOOTING FIG 3 6 CHECK A4RT300 R530 U513 GO TO AT TURN ON TROUBLESHOOTING FIG 3 4 CHECK IF OCP 15 ENABLED AT TURN ON AND CURRENT 15 PROGRAMMED TO ZERO OR OUTPUT SHORTED 3 10 Figure 3 1 Overall Troubleshooting Sheet 4 of 4 START NO DISPLAY WARNING THS CONFIGURATION IS FOR THE TEST ONLY 00 NOT FLOAT THE OUTPUT OR ATTEMPT TO OPERATE THE SUPPLY TURN OFF SUPPLY AND REMOVE TOP COVER AND AR SHIELD UNPLUG CABLE W5 FROM J108 A2 GPIB BOARD AND UNPLUG CABLE W4 FROM J502 ON 5 CONTROL BOARD PLUG CABLE WS INTO J502 CONTROL BOARD THIS REMOVES THE GPIB BOARD FROM THE DATA PATH AND CONNE
12. U513 The secondary microprocessor translates the serial data received from the A2 board into a parallel 12 bit data bus The data bus is connected directly to the three DAC OP amplifier circuits Under control of the microprocessor the selected DAC converts the data on the bus into an analog signal The DAC reference circuit U505 U517 provides a 10V reference for the CV and CC DACs and a 11 6V reference for the readback DAC A CV DAC OP amplifier U507 U508 converts the programmed value of voltage on the bus into the CVPROG signal CVPROG is sent to the CV control circuits to control the magnitude of the output voltage in the CV mode The range of CVPROG is 0 to 10V which corresponds to the zero to full scale output voltage range of the power supply A CC DAC OP amplifier U509 U510 converts the programmed value of current on the bus into the CCPROG signal CCPROG is sent to the CC control circuits to control the magnitude of the output current in the CC mode The range of CCPROG is 0 to 10V which corresponds to the zero to full scale output current range of the supply The Readback Comparator circuits U503 U513 operate with the readback DAC OP Amplifier U511 U512 to return the following signals to the microprocessor The monitored output voltage VMON The monitored output current IMON The ambient temperature AMB SENSE The programmed voltage value CVPROG The programmed current value CCPROG The fan speed F
13. ELECTRICAL PARTS 0698 7163 Resistor 2 0081K 0 1 0698 6631 Resistor 2 5K 0 1 0698 6348 Resistor 3K 0 1 0 125W 0699 1212 Resistor 19K 0 1 0698 6392 Resistor 22K 0 1 0 125W 0757 0442 Resistor 10K 1 0 125W 0757 0401 Resistor 100 Q 1 0 125W 0698 3456 Resistor 287K 1 0757 0465 Resistor 100K 1 0757 0462 Resistor 75K 1 0 125W 0698 4486 Resistor 24 9K 1 0757 0442 Resistor 10K 1 0 125W 8159 0005 Resistor 0 0757 0442 Resistor 10 1 0 125W 0757 0280 Resistor 1K 1 0 125W 0698 8827 Resistor 1M 1 0 125W 0698 3162 Resistor 46 4K 1 0757 0280 Resistor 1K 1 0 125W 0757 0273 Resistor 3 01K 1 0698 3155 Resistor 4 64K 1 0757 0442 Resistor 10K 1 0 125W 0757 0289 Resistor 13 3K 1 0757 0472 Resistor 200K 1 0757 0273 Resistor 3 01K 1 0757 0442 Resistor 10K 1 0 125W 0757 0199 Resistor 21 5K 1 0757 0442 Resistor 10K 1 0 125W 0757 0273 Resistor 3 01K 1 0757 0407 Resistor 200 Q 1 0 125W 0757 0273 Resistor 3 01K 1 0757 0407 Resistor 200 Q 1 0 125W 0757 0273 Resistor 3 01K 1 0698 3279 Resistor 4 99K 1 0698 4479 Resistor 14K 1 0 125W 0757 0465 Resistor 100K 1 0757 0442 Resistor 10K 1 0 125W 0698 3155 Resistor 4 64K 1 0698 3162 Resistor 46 4K 1 0757 0429 Resistor 1 82K 1 0757 0434 Resistor 3 65K 1 0698 3450 Resistor 42 2K 1 0757 0407 Resistor 200 Q 1 0 125W 0698 4486 Resistor 24 9K 1 0757 0472 Resistor 200K 1 0757 0434 Resistor 3 65K 1 Replaceable Parts 105 Table 5 9 A5 Control Board Replaceable P
14. RU tesi 34 G GPIB MN 25 UR pi deinen I Rass HEU RU ER 67 GPIB interface testing oie necp ente EROR EO eH he em Pe edem eere dts 34 l QUELY aS es GE EP eS A e In AT 60 inhibit calibration JUMPER DROIT 67 Isolator Board Circuits sx rere n tee e eere 82 J jumper DIG UO went Siete SESS E REED NERIS 61 FACTORY PRESET CA ce need DH e ET Ea e S E E ero 61 INHIBIT CA 61 NORM spa M 61 K D 17 L ee REA REPRE PIRE A ET 11 line m chen rr ERN EPOR EU E REO Fe 11 M Index 161 manual EE 12 manual changes sheet ue 12 13 manufacturing date determining 12 message PWR e EHE E 34 67 Mnemonics signal names oer rae Hr re FU AED Rer a RR ETE 124 m tual couplImsg testlead cive tuve Dare ede iet eb lever 17 N Wrap 15 Operating ias EET 1 oscilloscope Agilent 54504 ib tete ee a he ten eee ae eerte ee irte 16 output heatsink or e eft ERROR HERES T PRESE RUE s 75 output rectifiers loc
15. 00000000 U310 U309 O mm x lt J400 xo 0 HP IB sal 8 E418 E412 SW300 9 9 a o o Figure 6 9 A4 AC Input Board Assembly Diagram and Test Point Locations SINGLE PHASE AC INPUT E415 TTT NEUTRAL FRONT PANEL LINE SWITCH C430 53281 fone L400 E403 E404 Q EI 1 r 4400 1 15U4 5 J400 2 E411 O RAIL RAIL 15Us 4 AAA gt J500 7 10 14 3U U310 PRIMARY BIAS SUPPLY 1N4150 C360 U310 s gt 5 PIN 8 GNDB HS91 500 9 150 150 ULN2003A 0302 y U310 LM317T 150 R317 R376 D319 14 LINE VOLTAGE WN 15 lt AA J500 8 SELECT SWITCH 53215 0 10 74 37 ULN2003A U310 220 240 S 43 4A 10502 1 1 ULN20038 1 0UF C206 R316 es 0 2 61K 1500 4 1K RELAY ON 3 ULN2003A 680K 5x 0310 1 44 J500 2 11 1500 6 ULN2003A 9500512 U310 10 ULN2003A 1301 2 1505 lt gt gt J500 3 1505 4 3J500 5 HPIB BD Sois lt lt 15 64 5500 1 9500 45 RT300 RT300 R339 4 64K gt J500 9 RESET J500 10 BIAS D
16. 5 Figure 6 8 2 Isolator Board Assembly and Schematic Diagram for 654xA amp 655xA Models Only 50 50 R802 4 64K 4 64 5U TO FRONT PANEL J802 1 4802 2 REFERENCED TO M SUPPLY COMMON J802 z 600V ISOLATION J802 4 REFERENCED TO EARTH GROUND gt J802 6 1805 72 511 50 50 CR802 o 0804 J803 2 BIAS 5200 25 1803 1 CR803 PHONE CONNECTOR PIN DESIGNATIONS 5 8 1 4 4 6 4 2 Figure 6 18 2 Isolator Board Assembly and Schematic Diagram 667xA only Backdating Manual backdating describes changes that must be made to this manual for power supplies whose serial numbers are lower than those listed in the title page to this manual Look in the following table and locate your Agilent Model Then look at each serial number listed for this group If the serial number of your power supply is prior to any of the serial number s listed perform the change indicated in the Change column Note that several changes can apply to your supply You may also be instructed to update your power supply if certain components are being replaced during repair For all Agilent Models make ch
17. 5 PRINT Transferring calibration data to factory preset locations Fact_cal_sour Address of factory calibration data source DATA 2 6 68 72 20 24 76 80 150 Fact_cal_dest Address of factory calibration data destination DATA 84 88 92 96 100 104 108 112 116 Fact_cal_len Length of factory calibration data DATA 4 4 4 4 4 4 4 4 2 RESTORE Fact_cal_sour FOR I 1 TO 9 READ Cal_sour_addr I NEXT I RESTORE Fact_cal_dest FOR I 1 709 READ NEXT RESTORE Fact_cal_len FOR I 1 709 READ Cal_lengthc1 NEXT I FOR I 1 TO 9 Locations of good data OUTPUT Ps DIAG EEPR Cal sour addr D Cal length I Read good data ENTER Ps Cal_data Enter good data OUTPUT QGPs DIAG EEPR Cal dest addr D Cal length 1 Cal data Write good data to factory preset locations 2070 2080 2090 NEXTI 2100 Cal off 2110 2120 2130 2140 CLEAR SCREEN OUTPUT Ps CaL STATE OFF Turn off cal mode GOSUB Ps error Check for errors Figure 3 18 Initialization and Factory Preset Replacement Program Listing Sheet 5 of 6 68 Troubleshooting 2150 IF Err THEN 2160 PRINT An error occurred during the EEPROM read write Check for 2170 PRINT programming errors Initialization data may be incorrect 2180 STOP 2190 ENDIF 2200 2210 PRINT Operation complete Program stopped 2220 STOP 2230 2240 Ps
18. 61 Schematic P 129 SCPL pro 1 secondary interface testing esas 34 sens terminals sssaaa ints Rie is ee e Seu EA Bee 17 serial number ose e Dente p pecie ete Tp tita 12 serial number Prefix Jude ee ree e ee eee ee lee ete penne ae 12 settling tme oen EE RE 17 Signal name Or HER e e RU DEUS e REOR 124 Signals 3 5 V bias voltage 2 208 Haie e ete BAM AM AAG 84 A R ete eh et eene 84 PIER ios 4 ttes e gm 4 4 SPCLR 52s ities ate ee Mead ads ee Ne aie eed tenait dot 84 SEX den ue PU RE R 84 TX D cien tdt Ee 84 XEMRTI gh Sandisk an Wo amo eie og fA 84 slew Mb ERIS Eb Td esten 17 T test 15 test equipment troubleshooting uha enne rennen EKo tene aps ene 34 test BDeaders us a ede epe ed aee 60 test leads sah 17 testmeasurerients 23 test points 61 Test point RH 130 tests t catigot nita nacha dette E
19. 78 AS Control aa Sisa ve G etn eie v tae tenti eade OE et 79 Secondary Interface auct Tet e eee Ie tU Oreste etes tee cub og 79 tete iat Sate edema ine 80 Switching Downprogramming 80 In 81 AA AC Input Bo td tU oes Dash o ette ie 81 Input Filter and Pene ener ee ER 81 Bias Supplies and Bias Detect sse ide t Dp ERR RERO SEE PIRE IEEE ERE 81 Fan Speed Control oot e ERU Ren itte uini eti totu umen ili RR 82 A3 EET Bo atd 5 EU dae uA an Id ai nae 82 Output eai E RERO ERU SPEI Bep 82 Replaceable Parts edet re S Eres ese PE PLU SERERE SEES EE TER od se e be orae e erae eee opu 85 INTRODUCTION iot ott ete te eee oe etel t ve pe eere tnde ted yeu 85 Chapter Organizations esteem qe RURSUS 5 Reading the Tables epe RE ei ere RI e Mee Hei eres 85 HOW TO Order Parts eer retener 86 119 ka 119 Chapter Organization ss ee e tree u 119 General Schematic miden Rhee Se ce decet Seater 125
20. e 0172 2519 6TT o N beta gt 5 ezta 2 0274 ELIO m Sv T TOTS 5 m E z e X Figure 6 5 2 GPIB Board Assembly Diagram 667xA only P101 2 101 1 0121 LM309K UCC D108 5 0101 SEND y I SEN2 D110 REM MC3423 R104 GND 4 64K D107 J114 TELE JACK IN J115 TELE JACK OUT rs 4101 16 4101 15 4101 14 4101 1 J101 4 4101 3 4101 2 J101 1 J101 18 _ 4101 19 lt 1101 20 POTN S U O C124 UC 98102 J101 22 gt V J101 22 9 J101 24 1 9 J101 125 4101 17 J101 9 J101 7 J101 8 J101 6 J101 5 J101 11 J101 10 4101 25 4101 26 CONN MTG HOLES 504 m AYO eroe 20 UCC U122 DC TE REN REN IFC IFC NRFD NRFD NDAC DAU DAV ATN ATN SRQ SRQ 75161B GND 10 V 22 44 200 34 sme po 19 2 7 SH 01 36 5 0 pali9 0052 321508 ps 15 prog p4 4 003 39 13 D 2 0103 41 220102 0101 23 gt CONT U117 99014 TRIG i PREN ACCRA 19 ACCG REN 18 25 IFC 16 22 NRFD 17 26 NDRC 15 29 DAU 14 30 EOI 13 31 12 SRQ GND HSRG 22 ISRG 500 C142 V 420PF 50U
21. 10 50V 0160 4183 Capacitor 1000 20 0160 5098 Capacitor 0 22 10 0160 4835 Capacitor 0 1uF 10 50V 0180 4136 Capacitor 10 20V 0160 4183 Capacitor 1000 20 0160 4835 Capacitor 0 1uF 10 50V 0160 4801 Capacitor 100 5 1901 1098 Diode 154150 1901 1098 Diode 154150 1901 0880 Diode GEN PRP 1901 1098 Diode 1N4150 1901 0880 Diode GEN PRP 1901 1098 Diode 1N4150 1901 0880 Diode GEN PRP 1901 1098 Diode 1N4150 1901 0880 Diode GEN PRP 1901 1098 Diode 1N4150 1901 0880 Diode GEN PRP 1901 1098 Diode 1N4150 1901 0880 Diode GEN PRP 1901 1098 Diode 1N4150 1901 0880 Diode GEN PRP 1901 1098 Diode 1N4150 1901 0731 Diode PWR RECT 1901 0880 Diode GEN PRP 1252 3693 Connector 1251 7330 Receptacle modular phone 1252 0055 Connector POST TP HDR 1252 1992 Connector POST TP HDR 1251 8666 Connector POST TP 9140 0158 Inductor luH 10 1853 0510 Transistor PNP 0698 3456 Resistor 287K 1 1810 0305 Resistor network SIP 0757 0123 Resistor 34 8K 1 0698 6983 Resistor 20 4K 0 1 0699 1212 Resistor 19K 0 1 Table 5 9 A5 Control Board Replaceable Parts continued Ref Desig Description R505 Model specific 6571A 6671A 6572A 6574A 6672A 6674A 6575A 6675A R506 R507 R508 509 511 512 513 514 515 516 517 R520 R521 R530 R531 R532 R533 534 R535 R540 R541 R542 R543 R544 R601 R603 R604 R605 606 R608 R609 R610 R611 R633 634 635 636 637 Agilent Part
22. 1901 1098 2110 0713 2110 0699 2110 0685 2110 0713 2110 0699 9170 0061 9170 1195 9170 0061 9170 1040 9170 1512 9170 0061 9170 1040 9170 1512 See Main Chassis Electrical Parts Not used Output rectifier Not used Output rectifier Not used Out Fuse submin 10AM 125V Fuse submin 5AM 125V Fuse submin 7AM 125V Fuse submin 10AM 125V Not used Fuse submin 5AM 125V Not used See Main Chassis Electrical Parts Not used Coil toroid Coil toroid Coil toroid Coil toroid Not used Coil toroid Coil toroid Coil toroid Not used Coil toroid Not used Replaceable Parts 113 Table 5 10 A6 output Filter Board Replaceable Parts continued Ref Desig L903 903 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A L904A 904B Model specific 6571A 6573A 6671A 6673A 6574A 6674A 6575A 6675A Q901 Model specific 6571A 6671A 6572A 6672A 6573A 6575A 6673A 6675A Q902 Model specific 6571A 6671A 6572A 6672A 6573A 6575A 6673A 6675A Q903 Model specific 6571A 6671A 6572A 6672A 6573A 6575A 6673A 6675A Q910 Model specific 6571A 6671A 6572A 6575A 6672A 6675A R901 904 R905 906 R907 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A R908 R909 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A 114 Replaceable Par
23. 7 6 I 022 ISEN 4900 4 gt ISEN SHIELDS ARE 022 250V 250VAC NOT USED ON 250 Olt WO15 F901 F902 ISEN 3J900 5 ISEN 8U UNIT SNUBBER BD umm 1 5A 5 T1 17 Spem lus gs 2 915 J900 7 xi 14 30 E H3 NOT J900 16 LOADED A N N rw V J900 17 D510 PSR E d 184150 154150 V 0901 gt 0902 gt 0903 2 DPS 3900 1 H z 80901 H 5 80901 H DOWN PROGRAMMER SHUNT R937 R916 t GI 75 gt NOT T N S 163 Q910 464 IRFIP240 5 2 2d 464 IRFIP240 5 e 464 IRFIP240 5 4 LM358 4 LM358 NOT J900 3 DOWN PROGRAMMER CONTROL RO10 LOADED 0920 t 4 4 J900 20 47K 5 2 77598902 1 5 1919 FAST SENSE 042 gt 12V 12 5 016 LOADED 1909 51900 19 14 35U J900 13 e e e e e gt 900 14 J300 15 XFMR LUG 6 18 M 900 18 6675 A7 Snubber Board 6673A 74A Snubber Board G D900 D 6675A only 42 234900 8 SNUBBER BD d 2500 R994 R990 R992 5 1 _ C990 18A 18A gt J300 9 25 50 lt 2200 PF M1 AV i Naw gt 900 10 680 To CHEM L IJX Q R991 FET BD HEATSINK M4 PL 9 lt RECTIFIER M2 4 t 7 TO CATHODE 8 R993 FET BD B 580 TB201 lt R995 LR993 LR991 T si gt et 18A MM c901 18A PINS 5 8 23 17 gt TO TP29 zo 5 gt CHOKE LUG
24. Agilent Part No Description ELECTRICAL PARTS continued 211 212 0683 1535 Resistor 15K 5 0 25W R213 214 216 217 220 221 0699 3196 Resistor 150 5 10W R222 0811 2556 Resistor 1 25 Q 1 4W R224 225 0699 3196 Resistor 150 5 10W R226 0683 1535 Resistor 15K 5 0 25 W R227 0698 3159 Resistor 26 1K 1 R228 0683 1015 Resistor 100 Q 5 0 25W R229 0683 1005 Resistor 10 Q 5 0 25W R230 0683 3305 Resistor 33 Q 5 0 25W R231 0683 7505 Resistor 75 Q 5 0 25W R233 0683 1005 Resistor 10 5 0 25W R237 0757 0437 Resistor 4 75K 1 R238 0757 0280 Resistor 1K 1 0 125W R239 0757 0437 Resistor 4 75K 1 R240 0757 0280 Resistor 1K 1 0 125W 241 242 0757 0437 Resistor 4 75K 1 R243 0683 1535 Resistor 15K 5 0 25W R244 0757 0417 Resistor 562 Q 1 0 125W R245 0693 1015 Resistor 100 Q 5 0 25W R246 0683 1555 Resistor 1 5M 5 0 25W R247 0698 3450 Resistor 42 2K 1 R248 0698 3159 Resistor 26 1K 1 R249 0698 3518 Resistor 7 32K 1 R250 0698 3499 Resistor 40 2K 1 R251 0757 0288 Resistor 9 09K 1 R252 0698 3225 Resistor 1 43K 1 R253 0698 3136 Resistor 17 8K 1 R254 0698 3279 Resistor 4 99K 1 R255 0683 1015 Resistor 100 5 0 25W R256 257 0757 0316 Resistor 42 2 Q 1 R258 0683 1035 Resistor 10K 5 0 25W R261 0683 8205 Resistor 82 5 0 25W R262 0683 1215 Resistor 120 Q 5 0 25W R263 265 0683 8205 Resistor 82 Q 5 0 25W R266 0683 1215 Resistor 120 Q 5 0 25W R267 0683 8205 Resistor 82 5 0 25W R268 06
25. FAC_CAL Factory calibration ROM Read only memory FAN_PWM Fan pulse width modulation SPCLR Secondary power clear FPRX Front panel receive serial data RX Receive serial data FPTX Front panel transmit serial data RxD Receive serial data FS Fast sense SA Signature analysis HSRQ GPIB service request SRQ Service request GPIB IFC Interface clear GPIB SRX Secondary receive serial data IMON Current monitor STX Secondary transmit serial data INH_CAL Inhibit calibration TxD Transmit serial data IP External current programming UART Universal asynchronous Receive transmit IPROG Current programming VMON Voltage monitor ISEN Current sense vos Voltage offset ISRQ Interface service request VPROG Voltage programming KO 0 KO 5 Keypad output data bus WR Write 0 5 Keypad input data bus 120 Diagrams Table 6 3 Troubleshooting Test Points TEST POINT Signal Tested Measurement and Conditions No amp Loc A2 GPIB BOARD 667xA Series Only J106 4 Primary chassis ground Connect meter or scope common here Then make measurements at test points through s U101 1 5V primary bias 5V 0 2V U101 6 PCLR Goes high for approximately 40 ms at power on then goes low U101 8 PCLR Held low for approximately 40 ms at power on then goes high 110 STX Primary transmit to secondary serial data line Toggles between 0 U110 3 y Y gg and 5V 0111 6 SRX Primary receive from secondary serial data line
26. Figure 3 17 Signature Analysis Connections for Model 667xA Only 60 Troubleshooting Table 3 6 Front Panel SA Test Description These signatures check front panel microprocessor AIU3 Valid A1U4 ROM Firmware Revision A 01 07 Test Setup See Figure 3 17 1 Turn off the power supply and remove the top cover 2 To gain access to Al Front Panel Board perform steps 1 and 2 of the disassembly procedure for A1 Front Panel Assembly see Disassembly Procedures 3 Connect SA jumper of connector J3 on Al Front Panel Board see Figure 3 15 4 Connect signature analyzer CLOCK START STOP and GROUND inputs and setup as shown in Figure 3 16 5 Turn on the power supply and use the signature analyzer probe to take the following signatures Power Microprocessor SV 3395 A U3 15 0000 03 19 5520 A U3 20 954C 21 A552 22 2954 AlU3 23 0 55 24 3395 AlU3 25 3395 A U3 26 0000 AIU3 27 0000 03 28 40 5 A1U3 29 1029 A U3 30 0295 A U3 31 0000 A U3 32 3395 03 33 0008 A U3 34 040A A U3 35 0102 03 35 0002 A U3 39 0020 A U3 42 0000 6 After completing the tests be sure to return the J3 jumper to its original position Troubleshooting 61 Table 3 7 Secondary Interface SA Test Description These signatures check the secondary microprocessor A5U504 Valid A5U504 ROM Firmware Revision 01 04 Test Setup See Figure 3 17
27. Not used 0180 4390 Capacitor 12 000uF 45V 0160 4372 Capacitor 7 000uF 75V 0180 4466 Capacitor 2 100pF 150V 0180 4333 Capacitor 22 000 16V 0160 4835 Capacitor 0 17 10 50V 0160 4834 Capacitor 0 047 1096 0160 6804 Capacitor 0 047uF 250V 0160 4183 Capacitor 1000pF 2096 0160 4048 Capacitor 0 22 20 0160 4413 Capacitor 0 6uF 10 0160 4048 Capacitor 0 22 20 0160 4183 Capacitor 1000 20 Not used 0160 4835 Capacitor 0 1 10 50V Table 5 10 A6 output Filter Board Replaceable Parts continued Ref Desig Agilent Part No Description ELECTRICAL PARTS C931 Model Specfic 6571A 6671A 0160 5468 Capacitor 0 47 50V 6572A 6672A 6573A 6575A 0160 6825 Capacitor 0 47 250V 6673A 6675A D900 Model Specific D901 Model specific 6571A 6574A 6671A 6674A 6575A 6675A D902 Model specific 6571A 6574A 6671A 6674A 6575A 6675A D910 911 Model specific 6571A 6671A 6572A 6575A 6672A 6675A F901 Model specific 6571A 6573A 6671A 6673A 6574A 6674A 6575A 6675A F902 Model specific 6571A 6571A 6672A 6672A 6573A 6673A 6574A 6674A 6575A 6675A L900 Model specific L901 902 Model specific 6571A 6572A 6671A 6672A 6573A 6673A 6574A 6674A 6575A 6675A L9OIA Model specific 6571A 6671A 6572A 6573A 6672A 6673A 6574A 6674A 6575A 6675A L901B Model specific 6571A 6671A 6572A 6573A 6672A 6673A 6574A 6674A 6575A 6675A 1906 0404 1901 1182
28. Y A 0 15 50 C132 047 500 ROM CLOCK RAM FP HPIB PTX UART FPRX RDY MSRQ BANKSEL ISRQ RD DFI EN WR SRX AC6 5U C135 22 HORS 200 IER C137 102 0 1 1101 90V 22PF R144 0 42UH 100 5L C123 C126 R143 E A XTAL1 66 27 R140 as 905 13 Sa 1504 12 4 64K HSO3 54 HSO2 MSRQ ag HS01 55 500 RI 5 51 HSIO 1 01 382 5L 1 02 55 P2 R141 P2 22 pa 4 64K 44 55 15 P2 17 18 RxD TxD PREN 8 4 64K R129 10 PO PPS ni 4 64K 2 5 Slo 4 1513 5L TR VREF 2 1 AGND 2 0 1 086 16 RESET x2 32 RDY 6 880 U114 5 800196 55 NMI CLOCK CLKOUT C139 BUSWIDTH 7047 USS2 0551 500 V DFI_EN FPTX PRX STX HSRQ CLK1 CLK2 1MHZ 16 AC4 15 AC3 14 R 2 13 AC1 ES m CLEUIS PCB MTG E6 HOLES CLEUIS U106 no 11 ACO 19 act ROM 25 al EETA aci B Ac as 04 2 AC4 5 ace 000 13 4 AC 001 aa 29 ACB Dce 15 28 ace DC2 ag lee 809 14 15 0133 18 24 109 Dcz aio 4 ACO 20 01407 19 004 A11 015 20 DOS pas A12 27 R 11 acia D 6 21 50 12 poy 22 046 Tar acra 2 A 15 22 22 000 11 DC1 12 25
29. scsssssccenseasssasstnsevsseasanssavscsanaswas cose auescavesdousoossoucgesasaasedacssnseseassosscasssasgussondoaseauaebesaenseonoasvaacgsbensssaseasoonssensounsee 147 Introduction Scope Organization This manual contains information for troubleshooting and repairing to the component level the following 2 kilowatt power supplies Agilent Series 657xA manually programmable bench and e Agilent Series 667xA GPIB programmable system supplies The remaining chapters of this manual are organized as follows Chapter Description Chapter 2 Verification procedures to determine the performance level of the supply either before or after repair Chapter 3 Troubleshooting procedures for isolating a problem procedures for replacing the defective component and if required post repair calibration and EEPROM initialization procedures Chapter 4 Principles of power supply operation on a block diagram level Chapter 5 Replaceable parts including parts ordering information Chapter 6 Diagrams including schematics component location drawings and troubleshooting test points Appendix A Backdating information for power supplies with serial numbers below those listed in the title page of this manual Related Documents Change Sheet There may or may not be a Manual Change sheet included with this manual see Manual Revisions If one is included be sure to examine it for changes to this manual Operating Manual Each power supply is
30. 1 Turn off the power supply and remove the top cover 2 To obtain a setup that allows access to components and test points on the A5 Control Board follow the procedure given in Table 3 3 under A5 Control Board Setup 3 Connect signature analyzer CLOCK START STOP and GROUND inputs and setup as shown in Figure 3 15 4 To place the secondary interface in the SA mode turn on the power supply while momentarily for 2 seconds shorting A5U504 1 to 50504 20 common 5 Use the signature analyzer probe to take the following signatures Power Microprocessor 5 V 1C4C 50504 1 F77H A5U504 2 C98P A5U504 3 1573 50504 4 2 A5U504 5 UHF8 50504 6 F5UC A5U504 7 UH8C A5U504 8 23UC A5U504 9 0000 A5U504 10 IC4C 50504 11 IC4C 50504 12 C76F 50504 13 0042 50504 14 2189 50504 15 IC4C 50504 16 1C45 50504 17 0010 50504 18 IC4C 50504 19 IC4C A5U504 20 0000 50504 21 0 98 A5U504 22 5 7 A5U504 23 0000 A5U504 24 6CAP A5U504 25 A339 A5U504 26 A319 A5U504 27 A339 A5U504 28 0C98 A5U504 29 IC4C A5U504 30 0000 A5U504 31 1C4C A5U504 32 0000 A5U504 33 0000 50504 34 1C47 A5U504 35 0000 A5U504 36 OUPU A5U504 37 UF7P A5U504 38 347F A5U504 39 CP47 A5U504 40 IC4C 6 After completing the tests be sure to return the J3 jumper to its original position Note After completing
31. 32 Bias and Reference Supplies item coe eee tee i G bct ias ai ass se as 32 Status Annunciators Troubleshooting nennen nennen nennen tren nennen 53 5 Control Board Troubleshooting SefUD u Atras erin 53 A3 FET Board Troubleshoot es e e bee ak p 53 Signature Analysis Deh les 56 Introd ction eee ER ae IIR 56 Firinw re REVISIONS stag cheeses De PEE FR D SOR 56 Test Headers 56 Post Repair Calibration eit eb Gas G 63 When Required eit S ua p EE Be a ee 63 Inhibit Calibration ote 20 63 e pue t ep 63 Restoring Factory Calibration Constants sess nren ens 63 EEPROM Initialization ferte terere ce PRU ENRE PER 64 Transferring Calibration Constants To Factory Preset 64 Disassembly Procedures eee teet ipei A agerem 69 Top o I PRI RS SRG 69 REI Shield REPERI hee ee ee eam iod 69 Front Panel Assembly eee teet ERE Ee EDI USE ER EUER ptit B ER E ERE 70 70 AT Front Panel eee Quee ere qe EUN EE MU 70
32. 0 9V C354 25V 22 5V to 27 5V U310 6 RELAY ON U308 6 RESET U308 7 BIAS OK 5V U308 1 PREF 2 5V U308 5 RESET Held low for approximately 50 ms at power on then goes high U311 7 FAN DETECT 43V D317 25V 43V U311 2 FAN PWN 0 6V A3 FET Board Note Test points Gs through Gs the FET Board Troubleshooting procedures at these points are given under Dynamic Troubleshooting section of the FET Troubleshooting Chart Table 3 4 122 Diagrams Table 6 3 Troubleshooting Test Points continued TEST POINT No amp Loc Signal Tested Measurement and Conditions 5 Control Board 558 0505 6 0517 7 0508 6 0510 6 0615 1 0615 7 0630 2 0618 1 0617 6 0612 7 0612 1 0630 3 0621 0607 7 GD 0607 1 0602 9 0605 3 Ga 0602 6 Secondary common Sheet 1 Connect meter or scope common here Then make measurements at test points through and through CC CC DACs reference 10 0 05 Sheet 1 Readback DAC reference 11 6 0 1V Sheet 1 CVPROG Sheets 1 2 Approximately 4 6V with voltage programmed 1 2 of full scale CVPROG Sheets 1 2 Approximately 4 1V with voltage programmed 1 2 of full scale Note Measurements at test points through where taken under the following conditions 1 Programming a Programming Voltage scale b Current scale c OV full scale 2 First measurement in CV mode with no load 3 Second measu
33. 0160 5098 Capacitor 0 22uF 10 0160 4835 Capacitor 0 1uF 10 50V 0160 4834 Capacitor 0 47uF 10 0160 4808 Capacitor 470pF 5 0160 4812 Capacitor 220pF 5 0160 4835 Capacitor 0 1 10 50V 0160 5469 Capacitor 1uF 10 50V 0160 5892 Capacitor 0 22 10 0160 5468 Capacitor 0 47 50V 0160 7277 Capacitor 2 2 50V 0160 4835 Capacitor 0 1uF 10 50V 0160 4832 Capacitor 0 01 10 0160 4791 Capacitor 10 5 100V 0160 4787 Capacitor 22pF 5 100V 0160 4797 Capacitor 3 3pF 0160 4835 Capacitor 0 1 10 50V 0160 4797 Capacitor 3 3pF 0160 5098 Capacitor 0 22 10 0160 4811 Capacitor 270pF 5 0160 4799 Capacitor 2 2pF 0160 4795 Capacitor 4 7pF 0160 4835 Capacitor 0 1 10 50V Replaceable Parts 103 Table 5 9 A5 Control Board Replaceable Parts continued Ref Desig C750 751 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A C760 C851 C852 C855 C885 894 895 C892 893 C896 C899 D530 D605 610 613 615 D618 D620 621 626 627 630 631 641 D651 D660 661 D662 665 D666 668 D676 D678 D679 680 D685 D687 D688 689 D690 692 R504 Model specific 6571A 6671A 6572A 6574A 6672A 6674A 6575A 6675A 104 Replaceable Parts Agilent Part No Description ELECTRICAL PARTS Not used 0160 4829 Capacitor 680pF 10 0160 4822 Capacitor 1000 5 0160 0178 Capacitor 470 5 0160 4788 Capacitor 18pF 5 100V 0160 4835 Capacitor 0 1
34. 161 500 3 1 500 1768 5 255 0 0 DATA 1296 6572 0 20 180 20 180 175 33 98 DATA 115 30 20 1 58 390 Eprom data 6x73 DATA 111 16 35 35 8 0 99 0 53 39 100 61 5 0 DATA 82 1 18 68 79 5 42 0 99 255 20 10 DATA 6573 92 166 322 52 162 759 11768 5 255 0 0 DATA 1296 6573 0 20 180 20 180 175 33 98 DATA 115 30 20 1 58 460 Eprom data 6x74 DATA 60 70 61 425 0 82 0 80 70 35 83 0 DATA 99 1 11 4 0 72 0 82 255 20 10 DATA 6574 55 500 90 500 1768 5 255 0 0 DATA 1296 6574 0 20 180 20 180 175 33 98 DATA 115 30 20 1 58 530 Eprom data 6x75 DATA 29 85 123 0 82 0 179 84 18 5 0 DATA 99 1 5 069 130 25 144 0 82 255 20 10 DATA 6575 27 646 170 645 1768 5 255 0 0 DATA 1296 6575 0 20 180 20 180 175 33 98 DATA 115 50 20 1 58 Data for word length EEPROM data for 6571A and 6671A EEPROM data for 6572A and 6672A EEPROM data for 6573A and 6673A EPROM data for 6574A and 6674A EEPROM data for 6575A and 6675A INPUT Input Power Supply model number Example 6671A Model Model TRIM UPC Model CLEAR SCREEN RESTORE Eprom data addr Figure 3 18 Initialization and Factory Preset Replacement Program Listing Sheet 2 of 6 Troubleshooting 65 650 660 FOR I 1 TO 45 670 READ Addr I 680 NEXTI 690 700 RESTORE Eprom_data_len 710 720 FOR I 1 TO 45 730 READ Length I 740 NEXT I 750 760 SELECT Model 770 780 CASE 6571A 790 RESTORE Eprom_data_6x71 800 CASE 6572A 810 RESTORE
35. 3r co 2195 sa 4 646 ze NMC9346 8 7p 709H3 ADCO 9140 gqlt2 aco 1 ALS573 S J33 7 23K0 4 97 TELE le 1 22 kOz KIO KICA KICS 4 j oco 1 z047 6 2 WS 5 POS 1 KEY V PLANE 50 W6 D1 50 MCL W8 RPG SHIELD 1 ae 3 TAB OF C13 4200 BOARD SHIELD 250U 7047 2 500 F6 5 V 95 RPG SHIELD NOTE 1 All resistor values are in OHMS 1 1 8W unless otherwise specified 8 All capacitor values are in microfarads unless otherwise specified Figure 6 4 A1 Front Panel Board Schematic Diagram
36. 7 Rel t d Documents uy e Sp 7 Change Sheet ol eG PG a MO A I OR we ea A 7 Operating Beles She eek 7 Instrument Identification s Ma n al REVISIONS n a n M Qa ma Firmware Revisions eerte EE REUS Pe ever ee egere dy 8 Safety Considerations eoru QREXE eR ec CONVENUONS 9 Blectrostatic Ue See 9 ss a 1 Introduction ete RR rete Ree dm 11 RR RECO re DR PU OPORTERE A Quit 11 Test Equipment Requited cereo t ere ee Pe de peret tle dep Eee A pee t ede codes 11 Lastof Equipment eire eR ERU rep eee RA anna eive loess eue een Pets 11 Current Monitoring ResIStop a ua m a eren rene enne entren tenent teretes tren tren trennen rennen ene 11 eer D A EE FR D DR er e ERR 12 Programming THe Tests e Rete eta eti pt Ati areas 13 General Consideratiornis s eate hte ree eee ka de ERU E e i 13 Programming Parameters uae Te deese An E 13 General Measurement Techniques t Ire cre Ue ER EINE RH RSS EUR RE D SR DP PUSEUR ER eror roten 13 Performance Test Record tinet onere a Hle oe devs ete 13 Operation Ver
37. A2U119 12 NO CHECK A2U112 U117 UNO CHECK FOR PRESENCE OF PULSES AT THE FOLLOWING CIRCUIT POINTS ON THE A2 GPIB BOARD SEE FIG 6 8 YES UART PULSES AT A2U100 167 Ne CHECK A2U120 Utt YES PTX PULSES AT NO CHECK A2U 12 U119 U A2U112 6 YES PULSES A2U119 18 CHECK A2U119 PRX PULSES AT A2U112 2 CHECK A1U119 CHECK A2U112 Figure 3 10 Serial Down Troubleshooting Sheet 2 of 2 48 Troubleshooting CHECK BIAS CIRCUIT ON MAIN 6 T BOARD OR OPEN CABLE 5V 8 804 TO PRIMARY F800 0805 5V LOADED 11VAC COM C803 SPCLR e J800 2 TO SEC HECK SPCLR CIRCUIT ON MAIN BOARG COM J800 1 OR OPEN CABLE RESET HIGH J801 2 TO CHECK UBOO U804 FRONT PANEL PRI COM C803 LOADING SIGNAL PULSES 9 BSTX J800 3 TO SECONDARY uP CIRCUIT ON MAIN SEC COM J800 1 BOARD OR OPEN CABLE U802 U804 FRONT PANEL CIRCUITS RxD 1 3 TO PRI LOADING SIGNAL PULSES FRONT PANEL uP CIRCUITS OPEN TxD7 i TO PRI CABLE OR 804 LOADING SIGNAL PULSES Rx 7 J800 4 TO SEC U801 0804 OR SECONDARY COM J800 1 CIRCUIT LOADING SIGNAL ISOLATOR BD APPEARS OK CHECK CABLES Figure 3 11 Isolator Board Troubleshooting Troubleshooting 49 START SECONDARY DOWN DISPLAY READS SECONDARY DN TURN OFF SUPPLY AND REMOVI TOP COVER AND INNER SHIELD BYPASS ISOLATOR BD BY UNPLUGGING CABLE FROM A2J801 AND PLUGGING
38. ATDSPI LCD Display E ees 0 ameter 70 AIGI and A1G2 Rotaty Controls ete Dee neer THE E o egt e ree re rece 70 ATK PDE RC y pad d PEU 71 Rear Panel and or 2 GPIB or Isolator 71 Output Subchassis A a eene 71 AS A 71 A6 Output Filter Boat edere e td eee no avec i ede e tado 72 A7 Snubber Board and D900 Output Rectifier sees een rennen nennen rene etre ene 72 T900 Output Power Transformer L900 Output Choke eese nenne nennen enne 72 AG Input Filter e B X R 72 FET Board and Heatsink Assembly ete RU Grut ata ee Ht aio sasawa 73 AA AC Input Board wo 23 ich nce ae eot d e Ie et eoe eite ete 74 BLEF90 aches EE ipe dra ipie 74 Principles 08688066 08800650808 77 Introd gtf n a 77 INTERFACE CONTROL CIR CULES os eee te a e 77 A2 GPIB Board 667xA Senes eee 77 A2 Isolator Board Circuits 657xA Series 78 Al Front Panel Assembly eet trece hh RED REI EOD RH par PRU hber breite
39. C9507 UR20 A uro01 S 8915 0 1 120 12U 3 01K 4900 5 DOWNPROGRAMMER CONTROL 560 4900 20 FAST SENSE 1900 19 14 3V4 gt J900 13 J900 14 C931 gt 1900 15 42 7 Snubber Board pas nubber Boar e e gt 1900 8 R994 R990 R992 x1 5990 900 9 10 10 10 lt 022 5 5x 5x gt 1 eu eu 1 FROM gt 1900 10 gt lt RECTIFIER ANODE M2 La e e e 2 FROM lt RECTIFIER R995 992 0991 x2 ANODE 10 10 10 5 gt C991 5 5x 5x gt 022 24 24 24 e e e Figure 6 14 A6 Output Filter amp A7 Snubber Boards Schematic Diagrams 65 6671A 72A D O 9 5905 0909 6953 6 JOO 9 09 Q IN o G TR915 o 901 916 R902 o 918906 R901 Q SO 9 9 909 5 Olafa a la KEA ala A a w o O i 6006 O 6 6 QG4166920 O OF oY Q 9 CPS sesio OC915 O R904 Foe R903 Feo Figure 6 15 A6 Output Filter amp A7 Snubber Boards Assembly Diagrams 65 6673A 74A TPS
40. CHANGE IC Read Only Memory U4 Agilent P N 5080 2208 from Fabricated To Purchased CHANGE 34 In Table 5 3 ADD Collar RPG P N 5040 1700 Qty 2 CHANGE 35 In Table 5 3 CHANGE Part number of the A2 GPIB board from P N 5060 3399 to P N 5060 3291 154 Backdating In Table 5 6 REPLACE Table 5 6 A2 GPIB Board Parts List in Section 5 of this manual with the A2 GPIB Board Parts List shown in Table in the next page REPLACE A2 GPIB Board Component Location diagram in Section 6 of this manual with the A2 GPIB Board Component Location Diagram shown in Figure at the end of this appendix CHANGE 36 In Figure 3 18 sheet 1 on page 72 Change first data value on program line 360 from 1296 to 1304 In Table 5 3 on page 91 A2 GPIB board to 5060 3399 In Table 5 3 on page 92 Change DSP1 to 5061 1190 In schematic Figure 6 14 Add D910 D911 R910 and VR902 to the down programming circuit This section of the circuit should match Figure 6 16 These components are model dependent In Table 5 6 on page 98 Change the part number of U121 to 1820 0430 CHANGE 37 In Table 5 5 on page 97 Change F800 to 5A normal blow part number 2110 0669 CHANGE 38 In Table 5 10 on page 118 Change Q901 902 and 903 to part number 1855 0835 CHANGE 39 In Table 5 3 on page 91 Change Front panel board for 667xA Series to part number 5060 3400 In Table 5 3 on page 92 Change and G2 to part number 0960 0822 In Table 5 3 on page 9
41. CR630 601 0 C601 5657 69 deoa o o Re 3 O R604 O e o 1 U602 R620 U604 OOOOOOOQO 00000000 0600 Figure 6 11 5 Control Board Assembly Diagram and Test Point Locations 509 R852 R672 R851 0502 509 D 0 11 50 SUCC 556 50 gt TELE 0501 11 JACK 1 50 4 ETE E 6 047 SPCLR Seo Sov SGND RT lt 20 40 VCC R502 5 0504 1 0502 pan 4 D po 24 DC10 3 DC10 DB 39 0 pil 2 17 9 1 2D 58 2 DU OUCLR T 7 12 she po id EDS Al es 1 STX Fate 4 7K 5 OUCLR aga Pre pey 7 OUPROG F3HZ OVSCR 8 2 35 P0 3 5 ut R885 Fans BSTX 5 34 0 4 P174 OUCMP lt gt 13 BOUPROG 33 05 1 5 2K nnn FO 11 SPCLR FAN_PWM DP TST 35 P0 6 P1 6r 8 pc2 19 5861 P0 2 1 2 D RESET z0 C885 54 1608 ALE 5896 mesa 16 R P3 6 4 99 ot L RD P3 7 C260 Pe P2 0 P3 0 V V 1806 2 1 3 1 lt 2 2 2 P2 3 PZ 3 CU lt gt P2 4 PZ 4 5 P3 5 OUPROG HN ac P2 6 50 ANAC 0 7 P272 xTAL2 x XTRL1 RST 55 RESET NOTE PSEN C241 1509 1 AMB_SENSE INHIBIT d RT300 LOW AFTER 10 SEC DELAY 20 509 50 DO NOT FAN D
42. Not used 5080 2177 MECHANICAL PARTS 1251 4211 Connector Q901 1340 1507 0515 1253 Insulator Q901 902 and 903 Screw cap M 8X1 25 shunt to A6 bd Replaceable Parts 117 Table 5 11 A7 Snubber Board Replaceable Parts Ref Desig C901 Model specific 6571A 6574A 6671A 6674A 6575A 6675A C990 991 Model specific 6571A 6671A 0160 5927 6572A 6672A 0160 6896 6573A 6673A 0160 6030 6574 6575A 6674A 0160 6838 6675A R990 991 Model specific 6571A 6671A 0698 3601 572A 6672A 6572A 6672A 0698 3614 6573A 6673A 6574 6575A 0764 0013 6674A 6675A R992 R995 Model specific 6571A 6671A 6572A 6672A 0698 3614 6573A 6673A 6574 6575A 0764 0013 6674 6675 R996 R999 Model specific 6571 6574 6671A 6674A 6575A 6675A 0698 3635 118 Replaceable Parts Agilent Part No Description ELECTRICAL PARTS Not used 0764 0013 Capacitor 2200pF 1KV Capacitor 0 022uF 400V Capacitor 0 015uF 400V Capacitor 0 01 400V Capacitor 2200pF 1KV Resistor 10 Q 5 2W MO Resistor 43 5 2W MO Resistor 56 Q 5 2W Not used Resistor 43 Q 5 2W MO Resistor 56 Q 5 2W MO Not used Resistor 680 5 2W MO Diagrams Introduction This chapter contains drawings and diagrams for troubleshooting and maintaining Series 657xA and 667xA Power Supplies Unless otherwise specified a drawing or diagram applies t
43. SUPPLY AND REMOVE TOP COVER AND AFI SHIELD PERFORM 5 CONTROL BOARD TROUBLESHOOTING SETUP TABLE 3 3 DISABLE THE OV INPUT BY LIFTING A5R691 TURN ON SUPPLY AND CHECK THE OUTPUT VOLTAGE GO TO OUTPUT HELD HIGH TROUBLESHOOTING FIG 3 6 OV STILL OCCURS CHECK ASR691 R696 CHECK VOLTGES AT A5USIT 14 84 ASUB30 10 AND ASUB30 15 63 WITH RESPECT TO COMMON 30 DOES 51 517 14 14V NO A Go To SHEET 2 IS A6U630 10 gt 05V CHECK 5 680 0480 R893 IS A5U630 15 HIGH CHECK 5 830 R884 FTO3 4A GAL CHECK A6U502 C665 R665 Figure 3 4 OV At Turn On Troubleshooting Sheet 1 of 2 Troubleshooting 39 FROM SHEET 2 CHECK OV PROG SIGNAL A5UB17 12 YES CHECK 50517 NO CHECK FOR PRESENCE OF OV PROG SIGNAL PULSES AT A5U504 15 amp A5U502 18 A5U504 15 PULSING CHECK A5U502 U504 ves 50502 18 PULSING CHECK A5U502 CHECK A5R533 R5365 C531 C532 Figure 3 4 OV At Turn On Troubleshooting Sheet 2 of 2 40 Troubleshooting START OUTPUT HELD Low SUPPLY S OUTPUT IS HELD LOW AND THE PROT ANNUNCIATOR IS NOT ON TURN OFF SUPPLY DISCONNECT THE LOAD REMOVE THE TOP COVER AND RFI SHIELD TURN ON SUPPLY AND CHECK THE BIAS AND REFERENCE VOLTAGES TEST POINTS THROUGH SEE TABLE 6 3 ARE VOLTAGES TROUBLESHOOT THE DEFECTIVE CIRCUIT
44. Test Setup Connect the appropriate current monitoring resistor see Table 2 as shown in Figure 2 1B The accuracy of the resistor must be as specified in the table Test Procedures The test procedures are given in Table 2 5 The tests are independent and may be performed in any order The CC tests are Current Programming and Readback Accuracy Current Sink CC Operation CC Load Effect CC Source Effect CC Noise PARD Table 2 5 Constant Current CC Tests Action Normal Result 1 1 Current Programming and Readback Accuracy This test verifies that the current programming and readback are within specification Turn off the power supply and connect the current monitoring resistor as shown in Figure 2 1B Connect a DVM across the resistor Turn on the power supply and program the output for 5 volts and 0 amperes Short the load Observe the DVM voltage reading Divide this by the resistance of the current monitor resistor Record the result as the Low Current value Record the front panel display readback Program output current to full scale see Table 2 2 Repeat Steps 4 and 5 Value within specified Low Current limits Value within specified readback limits Both current readings within specified High Current and readback limits Current Sink CC and Readback Accuracy This test verifies current sink operation and readback accuracy Turn off the power supply Connec
45. Toggles between 0 and 5V U119 4 FPRX Primary receive from front panel serial data line Toggles between 0 and 5V U119 18 FPTX Primary transmit to front panel serial data line Toggles between 0 and 45V A2 Isolator BOARD 657xA Series Only C803 Primary chassis ground U805 3 5V primary bias 5 0 2 7800 2 SPCLR Held low for approximately 40 ms at power on then goes high J801 2 PCLR also called RESET Held low for approximately 40 ms at power on then goes high 5 3801 4 TxD Primary transmit to secondary serial data line Toggles between 0 and 5 6 1801 3 RxD Primary receive from secondary serial data line Toggles between 0 and 5V 1800 4 Primary receive from front panel serial data line Toggles between 0 and 5V J800 3 BSTx Primary transmit to front panel serial data line Toggles between 0 and 5 Diagrams 121 Table 6 3 Troubleshooting Test Points continued TEST POINT Signal Tested Measurement and Conditions No amp Loc C307 15 Vp primary bias common Connect meter or scope common here Then make measurements at test points through R317 15 Vp primary bias 15 0 9V 403252 26V 24 4V to 28 6V C315 Secondary common Move meter or scope common here Then make measurements at test points through zz R333 5V secondary bias 5 0 2V R331 15V secondary bias 15 0 9V C353 26V 24 4V to 28 6V R330 15V secondary bias 15
46. With the pulse width modulator disabled the drive signals for FET regulators are removed thereby turning off the power supply output When OV is reset the secondary microprocessor generates OVCLR output protection clear which clears OVSCR During power initiation the secondary microprocessor generates an INHIBIT signal to hold the supply s output off for ten seconds After 10 seconds INHIBIT is removed and the output can be programmed CV CC Control These circuits are shown in detail on the A5 Control Board schematic Sheet 3 and include CV constant voltage and CC constant current control loops The power supply must act as either a CV or CC supply for any value of load impedance Switching between CV and CC mode is done automatically by the CV CC control circuits at a value of load impedance equal to the ratio of the programmed voltage value to the programmed current value A low level CV or CC signal is generated by the applicable Status Comparator U630 and returned to the secondary interface to indicate that the corresponding mode CV or CC is in effect In CV mode an OR gate diode D620 conducts and the CV loop regulates the output voltage A CV Error Amplifier P O U615 compares the programmed voltage signal CVPROG 0 to 10V range to VMON which is the output voltage monitor output signal of V DIF Differential Amplifier P O U615 The range of VMON is 0 to 10V which corresponds to the zero to full scale output voltag
47. an input of approximately 13V 8 Set external supply input to 15V and check drive 1 waveform at U201 10 and See Figure 3 14B drive 2 waveform at U201 12 9 Check that pulses are present at U201 1 U201 7 U202 1 and U202 7 See Figure 3 14C 10 Pulses should be present on both sides of inductors L201 204 and L213 216 as follows Check the pulses the driver transistor side 0251 0254 of each inductor See Figure 3 14D Check the pulses on the FET regulator side Q201 Q204 Q211 Q222 Q233 and Q244 of each inductor See Figure 3 14E If the waveforms do not have the fast step as shown in Figure 3 14 then the associated FET gate input has an open circuit 11 Measure the VREF voltage at U204 4 17 12 Check the peak current limit by connecting a 68KQ resistor from 5V U201 9 to All pulses turn off U204 5 54 Troubleshooting i IN OAN N IZIN 5V DIV 10 Us DIV A J200 TEST SIGNAL FROM SIGNAL GENERATOR 5V DIV 10 uS DIV C U201 U202 PINS 1 7 DRIVE SIGNAL 5V 10 yS DIV E L201 L203 L213 L216 REGULATOR SIDE 5V DIV 10 uS Div B U201 U202 PINS 10 12 DRIVE SIGNAL DIV 10 uS DIV D 201 1204 213 216 DRIVE SIDE Figure 3 14 A3 FET Board Test Waveforms Troubleshooting 55 Signature Analysis Introduction The easiest and most efficient method of troubleshooting microprocessor based instruments is with sig
48. annunciator is on If it is not adjust the load to slightly reduce the output current until the annunciator comes on The difference between the DVM readings in steps 5 and 6 are within the specified Source Effect limits Periodic and random deviations PARD in the output ripple and noise combine to produce a residual ac voltage superimposed on the dc output voltage This test measures CV PARD specified as the rms and peak to peak output voltages CV Noise PARD over the frequency range of 20Hz to 20MHz 1 Turn off the power supply and connect an a c coupled oscilloscope across the and output terminals see Figure 2 1A Set the oscilloscope bandwidth limit to 20MHz 30MHz for the Agilent 54504A and use RF tip on the oscilloscope probe Turn on the power supply and program the current to its maximum programmable value and the voltage to its full scale value see Table 2 2 Adjust the load to produce full scale current see Table 2 2 as shown on the front panel display Record the amplitude of the waveform Replace the oscilloscope connection with an ac rms voltmeter Record the reading obtained in Step 5 CV annunciator is on If it is not adjust the load to slightly reduce the output current until the annunciator comes on Amplitude is within the specified PARD Peak to Peak limits Amplitude is within the specified PARD rms limits Verification 17 Table 2 4 Constant Voltage
49. calibrate the power supply If either the front panel board or the EEPROM is replaced the power supply must be reinitialized with the proper constants by running the program listed in Figure 3 18 When the program pauses and asks you to make a selection respond as follows Initialization I or Factory Preset Replacement F I After the power supply has been initialized it must be calibrated as described in Appendix A of the Operating Manual After calibration transfer the new calibration constants to the EEPROM s Factory locations as described next Transferring Calibration Constants To Factory Preset Locations A newly initialized and calibrated power supply has calibration constants in operating locations but does not have the new factory calibration constants stored in EEPROM This procedure transfers the calibration constants into the EEPROM FACTORY PRESET CAL locations by running the program listed in Figure 3 18 When the initialization program pauses and asks you to make a selection respond as follows Initialization I or Factory Preset Replacement F F The new calibration constants will then be stored Pre initialized and tested 1 Front Panel boards are available for Analog Programmable bench series supplies see Chapter 5 Table 5 4 for part numbers A Bench Series Supply can be initialized and the new Factory Preset calibration constants loaded by temporarily replacing the A2 Isolator board with an A2 GPIB
50. for the FET switches The OV circuit compares the output voltage level with a signal OVREF that represents the programmed overvoltage level When the output voltage exceeds the programmed value the downprogramming circuits are activated and the FET switches are turned off The downprogramming control circuit generates control signal DP when an OV or INHIBIT condition has been detected or when the output is higher than was programmed DP causes the downprogramming MOSFETS on the A6 Output Filter Board to conduct current away from the load Power Circuits A4 AC Input Board The A4 AC Input Board see A4 AC Input Board schematic includes the following circuits Input Filter and Rectifier The single phase ac input 220 240 vac is applied through chassis mounted line filter FL1 a 25 ampere line fuse A4F400 and filter components on the A4 board to the front panel switch S1 When the switch is turned on filtered ac input is applied to a bias transformer A4T300 via a line voltage select switch A4SW300 and through turn on relay A4K401 contacts and R400 R401 to a bridge rectifier A4D400 The ac line voltage is rectified and filtered to provide 290 volts input lines to the FET Board Because filter capacitors are connected directly across the rectified line large inrush current surges at turn on could blow fuses or affect the operation of other equipment connected to the same ac line This is prevente
51. of each test point is shown on the the appropriate schematic and its associated parts location drawing Diagrams 119 Table 6 2 Signal Name Mnemonics Mnemonic Description Mnemonic Description A 0 A 15 Address lines MSRQ Microprocessor service request AD 0 AD 7 Address bus NDAC Not data accepted GPIB AMB_SENSE Ambient temperature sense NEG_IMON Negative current monitor ANA 0 ANA 7 Analog signal readback bus NRFD Not ready or data GPIB ATN Attention GPIB OV Overvoltage BIAS_OK 15V bias supplies have stabilized OV_CLR Overvoltage clear BOVPROG Buffered OV programming OVCMP Overvoltage comparator BSTX Buffered secondary transmit OVP_BIAS Overvoltage protection bias cc Constant current status OVPROG Overvoltage programming CCPROG Constant current programming OVSCR Overvoltage SCR crowbar cv Constant voltage status PCLR Primary power clear CVPROG Constant voltage programming PREF Primary reference voltage 2 53V D 0 D 7 Data lines PREF 2 Primary reference voltage 1 0V 0101 0108 Data lines GPIB PREN Primary remote enable DAV Data valid GPIB PRX Primary receive serial data DFI Discrete fault indicator PTX Primary transmit serial data DFI EN Discrete fault indicator enable PWM_EN Pulse width modulator enable DPS Downprogramming shunt RAM Random access memory DN_PGM Down programming RDY Ready DRIVE_A B FET drive signals REN Remote enable EOI End or identify GPIB Remote inhibit
52. operation due to a rising but yet unstable 5V is prevented until the 5V BIAS voltage fully settles When power is turned off or is removed SPCLR goes low immediately to disable the microprocessor in order to provide a graceful shutdown of the power supply as the 5V falls to zero volts Note PCLR is generated in the GPIB Board for Agilent 667xA models For Agilent 657xA models it originates at the main board secondary circuits and is routed to the Isolator Board The isolator board includes three separate optical isolator circuits that isolate the front panel signals RxD TxD and PCLR signals from the SRx BSTx SPCLR signals at the secondary interface circuits A1 Front Panel Assembly The power supply Al Front Panel Assembly contains a circuit board keypad liquid crystal display LCD and the power on off switch Circuit details are shown on the Al Front Panel Board schematic Front Panel Circuit Board A1 contains microprocessor circuits microprocessor U3 and ROM U4 that decode and execute all front panel keypad commands These are transferred to the power supply output via the serial I O port to the A2 board GAL gated array logic IC and isolators and to the secondary interface circuits on the A5 Control Board The front panel microprocessor circuits also process power supply measurement and status data received from the serial I O port This data is displayed on the LCD IC EEPROM electrically erasable programmable r
53. series Model specific parts are tabulated by model number under the reference designator The reference designators are defined in Table 5 1 Abbreviations used in parts descriptions are explained in Table 5 2 Table 5 1 Part Reference Designators assembly blower fan capacitor thyristor SCR diode SP display LCD fuse Q gt AQ VTA jack relay inductor plug transistor resistor thermal resistor switch transformer terminal block integrated circuit voltage regulator cable or jumper crystal oscillator Replaceable Parts 85 Table 5 2 Part Description Abbreviations assy assembly M metric sq square w o without bd board mch machine submin subminiature xfmr transformer blvl belleville mm millimeter thk thick xtal crystal gnd ground mtg mounting thrd thread lg long PCB pc board w with How Order Parts You can order parts from your local Agilent Technologies Sales and Support Office see the list of offices in the back of this manual When ordering a part please include the following information e the Agilent part number e the part description e the desired quantity e the model number of the power supply for example Agilent 6682A 86 Replaceable Parts Table 5 3 Main Chassis Replaceable Parts Ref Desig Agilent Part No Description ELECTRICAL PARTS 5060 3400 Fro
54. specific 6571A 6671A 6572 6672 6573A 6673A 6574 6575A 6674A 6675A W912 913 Model specific 6671A 6674A 6575A 6675A W914 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6575A 6571A 6574A 6674A 6675A VR902 Model specific Agilent Part No Description ELECTRICAL PARTS Not used 0698 4416 Resistor 169 Q 1 0 125W 0757 0274 Resistor 1 21K 1 0698 4416 Resistor 169 Q 1 0 125W 8159 0005 Resistor 0 Q Not used See Main Chassis Electrical Parts 9100 4909 Transformer power 9100 4946 Transformer power 9100 4945 Transformer power 9100 4910 Transformer power 9100 4944 Transformer power Not used 1826 0890 IC LN358A 1902 0960 Diode zener 12V 5 Not used 1902 0960 Diode zener 12V 5 Not used 1251 4180 Connector R902 ISEN Not used 5080 2177 Not used Not used 5080 2177 Not used 5080 2177 Not used 116 Replaceable Parts Table 5 10 A6 output Filter Board Replaceable Parts continued Ref Desig Description W915 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A W916 917 Model specific 6571 A 6574A 6671A 6674A 6575A 6675A W918 W921 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A Agilent Part No ELECTRICAL PARTS Not used 5080 2177 Not used 5080 2177 Not used 5080 2177 Not used 5080 2177
55. voltage by the resistance of the current monitoring resistor to obtain the output current Record the result Check the test result This test measures the change in output current resulting from a change in ac line voltage from its minimum to its maximum value within the line voltage specifications It is recommended that you use averaged readings for Steps 6 and 8 of this test see Averaging AC Measurements at the end of this chapter The power supply output current is full scale and its CC annunciator is on If not reduce the Electronic Load voltage slightly until the annunciator comes on You may want to use an averaged reading for this measurement You may want to use an averaged reading for this measurement The difference between the current readings found in Step 6 and Step 8 is within the specified current Source Effect limits Verification 21 Averaging the CC Measurements The CC Load Effect and CC Source Effect tests measure the regulation of the power supply s output current When doing these tests you must be sure that the readings taken are truly regulation values and not instantaneous ac peaks of the output current ripple You can do this by making each measurement several times and then using the average of the measurements as your test value Voltmeters such as the Agilent 3458A System Voltmeter can be programmed to take just such statistical average readings as required by these tests Th
56. voltage reading of the DVM Adjust load to draw 0 amperes open load Record voltage reading of the DVM Check test result CV annunciator is on If it is not adjust the load to slightly reduce the output current until the annunciator comes on The difference between the DVM readings in steps 4 and 5 are within the specified Load Effect limits CV Source Effect This test measures the change in output voltage resulting from a change in ac line voltage from its minimum to maximum value within the line voltage specifications 1 Turn off the power supply and connect the ac power input through a variable voltage transformer 16 Verification Table 2 4 Constant Voltage CV Tests continued Action CV Source Effect cont Set the transformer to the nominal ac line voltage Connect the DVM across LS and LS see Figure 2 1A Turn on the power supply and program the current to its maximum programmable value and the voltage to its full scale value see Table 2 2 Adjust the load to produce full scale current see Table 2 2 as shown on the front panel display Adjust the transformer to decrease the ac input voltage to the low line condition 174Vac or 191 Vac Record the output voltage reading of DVM Adjust the transformer to increase the ac input voltage to the high line condition 220Vac or 250Vac Record the output voltage reading on the DVM Check test result Normal Result CV
57. 00145 Bead Qty 2 to 0340 1277 Insulator Component Qty 1 CHANGE 19 In Table 5 3 ADD Service Manual Agilent P N 5959 3384 Qty 1 FOR MODEL OPTION 6672A 910 FOR MODEL OPTION 6673A 910 FOR MODEL OPTION 6675A 910 CHANGE For MODEL OPTION 6672A 910 For MODEL OPTION 6671A 910 For MODEL OPTION 6674A 910 Service Manual from Agilent P N 5959 3337 to Agilent P N 5959 3384 Qty 1 CHANGE 20 In Table 5 3 CHANGE Operating Manual from Agilent P N 5959 3352 TO Agilent P N 5959 3372 Qty 1 CHANGE 21 In Table 5 3 CHANGE Line Cord 12ga WCSA without plug from Option 931 to Option 831 Line Cord 4mm Harmonized without plug from Option 932 to Option 832 Line cord 10ga Canadian without plug from Option 934 to Option 834 Line Cord 12ga UL CSA with NEMA 6 20p plug from Option 941 to Option 841 Line Cord 4mm Harmonized with IEC 309 plug from Option 942 to Option 842 Line Cord 12ga Japanese with JIS C8303 plug from Option 943 to Option 843 152 Backdating Line Cord 10ga Canadian with NEMA 6 30P plug from Option 944 to Option 844 Line cord family drawing 8120 9296 from Rev to Rev CHANGE 22 In Table 5 11 CHANGE Capacitor Metalized Polyester Dielectric from 1 20 Agilent P N 0160 4962 to 1 Agilent P N 0160 7606 Qty 1 Circuit Ref C452 C30 C33 C1 C5 C133 C137 C5 C8 C9 C500 C502 C420 C421 C423 C497 C498 CHANGE 23 In Table 5 10 CHANGE Q201 204 21
58. 0pF 10 Capacitor 3300pF 5 Capacitor 2 2pF Capacitor 0 47uF 50V Capacitor 1uF 10 Capacitor 2 2 10 50V Capacitor 3 3uF 10 50V Capacitor 1uF 10 50V Capacitor 2 2 10 Capacitor 3 3uF 10 50V Capacitor 4 7pF Capacitor 2 2pF Capacitor 4 7pF Capacitor 1uF 50V Capacitor 0 22UF Capacitor 0 047uF Capacitor 0 022uF Capacitor 10 5 100V Capacitor 1000pF 5 Capacitor 0 047 10 Table 5 9 A5 Control Board Replaceable Parts continued Ref Desig Description C704 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A C706 C710 711 C712 Model specific 6571 A 6574A 6671A 6674A 6575A 6675A C714 Model specific 6571A 6574A 6671A 6674A 6575A 6675A C715 C716 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6575A 6674A 6675A C717 Model specific 6571 A 6574A 6671A 6674A 6575A 6675A C719 C720 C722 Model specific 6571A 6671A 6672A 6573A 6673A 6674A 6575A 6675A C723 C724 C731 C732 C733 C734 735 C736 C737 C738 C739 C740 C741 Agilent Part No ELECTRICAL PARTS 0160 4808 Capacitor 470pF 5 0160 4821 Capacitor 1200pF 5 0160 4808 Capacitor 470pF 5 0160 4821 Capacitor 1200pF 5 0160 4795 Capacitor 4 7pF 0160 4835 Capacitor 0 1uF 10 50V 0160 4808 Capacitor 470pF 5 0160 4813 Capacitor 180pF 5 0160 4808 Capacitor 470pF 5 0160 4812 Capacitor 220pF 5 0160 4805 Capacitor 47pF 5 100V
59. 1 R107 0698 0082 Resistor 464 1 0 125W R108 0757 0401 Resistor 100 Q 1 0 125W R109 0698 0082 Resistor 464 Q 1 0 125W R111 114 0698 3155 Resistor 4 64K 1 R115 117 0698 4037 Resistor 46 4 1 R118 0757 0280 Resistor 1K 1 0 125W R119 0698 8827 Resistor 1M 1 0 125W R120 122 0698 3155 Resistor 4 64K 1 R123 0698 0082 Resistor 464 1 0 125W R130 133 0698 3155 Resistor 4 64K 1 R134 0683 1015 Resistor 100 Q 5 0 25W R135 136 0698 3155 Resistor 4 64K 1 R137 0757 0401 Resistor 100 Q 1 0 125W 156 Backdating Table A 1 A2 GPIB Parts List continued Ref Desig Agilent Part No Description ELECTRICAL PARTS TB101 0360 2312 Terminal block digital control U101 1826 0468 IC MC3423PI U106 5080 2152 IC DROM GPIB U108 1818 4111 IC MCM 6164C55 U109 1820 6789 IC interface U110 111 1990 0444 IC Opto isolator U112 1820 3210 IC 68B50 U113 1990 0543 IC Opto isolator U114 1821 1479 IC MPU U115 1LH4 0001 IC GPIB transceiver U116 1820 2724 IC SN74ALS573BN U117 1820 2549 IC 8291A U118 1820 4185 IC interface U119 5080 2153 IC GAL programmed GPIB U120 5080 2154 IC GAL programmed IIPIB U121 1820 0430 IC LM309K VR101 1902 0766 Diode zener 18 2V 5 VR102 1902 0959 Diode zener 11V 5 VR103 104 1902 0049 Diode zener 6 19V 5 W101 1258 0209 Jumper Y101 0410 2109 Crystal oscillator 12 000MHz MECHANICAL PARTS 1205 0758 Heatsink 0121 0340 1277 Insulator Y 101 0535 0031 Nut hex w lo
60. 1 222 233 244 from POWER FET Agilent P N 1855 0849 Qty 8 to FET MACHED Set Agilent P N 5080 2241 QTY 1 CHANGE 24 In Table 5 6 CHANGE Diode Zener VR102 FROM 11V 2 Agilent P N 1902 3172 to 11V 596 Agilent P N 1902 0959 Qty 1 CHANGE 25 In Table 5 9 CHANGE Microprocessor U504 from Programmed Agilent P N 5080 2155 to Masked Agilent P N 1820 8600 Qty 1 CHANGE 26 In Table 5 9 ADD Label Fuse warning Agilent P N 7120 4827 Qty 1 For 6002A only Qty 2 CHANGE 27 In Table 5 9 CHANGE Thermistor 10K 25C Reference Designator 0837 0397 to Agilent P N 0837 0412 Qty 1 CHANGE 28 In Table 5 11 CHANGE Microprocessor U504 from programmed Fabricated Agilent P N 1820 5996 to Mask Purchased Agilent P N 1821 0223 Qty 1 Backdating 153 CHANGE 29 In Table 5 11 CHANGE 1 Microprocessor Masked U504 from Agilent P N 1821 0223 to Agilent P N 1821 0943 Qty 1 2 Firmware Secondary from Rev A101 03 to Rev A 01 05 3 READ ONLY MEMORY FRONT PANEL 5080 2208 CHANGE 30 In Table 5 11 CHANGE ROM Front Panel U4 Firmware from Rev A 01 07 to Rev A 01 08 CHANGE 31 In Table 5 7 CHANGE 1 Heat sink Ref D400 from Agilent P N 12050766 to Agilent P N 1205 0861 Qtv 1 2 Heat sink Ref D400 from Agilent P N 1205 0766 to Agilent P N 1205 0861 Qty 1 CHANGE 32 In Table 5 3 CHANGE Fuseholder Clip Type from Agilent P N 2110 0269 to Agilent P N 2110 0726 QTY 2 CHANGE 33 In Table 5 4
61. 10 2109 Crystal oscillator 12 000MHz MECHANICAL PARTS 0340 1277 Insulator Y501 1200 0552 Socket 40 0504 1200 0639 Socket IC 20 pin 0502 Replaceable Parts 111 Table 5 10 A6 output Filter Board Replaceable Parts Ref Desig C901 Model specific 6571A 6671A 6572 6672A 6573A 6673A 6574A 6674A 6575A 6675A C902 Model specific 6571 6671A 6572A 6575A 6672A 6675A C903 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A C904 Model specific 6571A 6671A 6572A 6575A 6672A 6675A C905 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A C906 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574 6674A 6575A 6675A C907 908 Model specific 6571A 6671A 6572A 6672A 6573A 6575A 6673A 6675A C909 910 C911 912 C913 914 C930 Model specific 6571A 6671A 6572A 6575A 6672A 6675A 112 Replaceable Parts Agilent Part No Description ELECTRICAL PARTS 0180 4333 Capacitor 22 000 16V 0757 0489 Not used 0180 4390 Capacitor 12 000uF 45V 0160 4372 Capacitor 7 000uF 75V 0180 4466 Capacitor 2 100uF 150V 0180 4333 Capacitor 22 000 16V 0757 0489 Not used 0180 4333 Capacitor 22 000uF 16V 0757 0489 Not used 0180 4390 Capacitor 12 000pF 45V 0160 4372 Capacitor 7 000uF 75V 0180 4466 Capacitor 2 100uF 150V 0180 4333 Capacitor 22 000 16V Not used 0180 4333 Capacitor 22 000uF 16V
62. 10uF 20V C310 0160 4834 Capacitor 047uF 10 C311 0180 3458 Capacitor 4700 50V C312 0180 3587 Capacitor 1000 50V C313 315 317 318 0180 4129 Capacitor 35V C320 322 0180 4131 Capacitor 4 7 35V C351 0180 3458 Capacitor 4700UF 50V 352 354 0180 0230 Capacitor 50V C357 0160 4554 Capacitor 01uF 20 358 359 0160 4835 Capacitor 0 1 10 50V C360 361 0180 3587 Capacitor 1000UF 50V C420 421 423 0160 7606 Capacitor 1 250V C425 426 0160 4439 Capacitor 4700pF C427 0160 4065 Capacitor 0 1 C430 0160 4355 Capacitor 0 01 10 C431 0160 4065 Capacitor 0 1 497 498 0160 7606 Capacitor 250V CR402 1990 0517 LED visible D306 310 312 317 1901 0731 Diode power rectifier D318 319 1901 1098 Diode 1N4150 D400 1906 0389 Diode full wave bridge 403 404 411 412 1251 5613 CONN SGL CONN F304 2110 0304 Fuse 1 5AT 250V F308 2110 0202 Fuse 0 5AT 250V F400 2110 0849 Fuse 25AM 250V F401 2110 0098 Fuse 20AM 250V FL1 see Table 5 3 1301 302 40 1252 0055 Connector POST TP HDR 1500 1251 8837 Connector POST TP HDR K400 401 0490 1746 Relay IC 30A 30Vde 15Vdc coil L402 06012 80095 Inductor output choke R315 0698 8672 Resistor 243 4 1 R316 0698 0085 Resistor 2 61K 1 R317 8159 0005 Resistor 0 R326 0698 8672 Resistor 243 4 Q 0 1 R327 0757 0281 Resistor 2 74K 1 R328 0757 0281 Resistor 2 74K 1 R329 069
63. 14835 AINO VxL99 QHvO8 13NYd 1 iv ASSY 13NYd 1NdN1 OV Figure 4 1 Agilent Series 665xA 667xA Power Supply Block Diagram Principles Of Operation 83 Replaceable Parts INTRODUCTION Chapter Organization This section lists the replaceable electrical and mechanical parts for the Agilent 657xA and Agilent 667xA Series power supplies Component location diagrams are located in Chapter 6 The lists consist of tables organized by assemblies as follows Assembly See Main chassis 1 Front Panel Board used in all models A2 Isolator Board used in Agilent 657xA models A2 GPIB Board used in Agilent 667xA models A3 FET Board used in all models A4 AC Input Board used in all models 5 Control Board model specific assembly A6 Output Filter model specific assembly A7 Snubber Board model specific assembly The locations of circuit board assemblies and chassis mounted components are shown in Figure 3 20 Table 5 3 Table 5 4 Table 5 5 Table 5 6 Table 5 7 Table 5 8 Table 5 9 Table 5 10 Table 5 11 Reading the Tables Each table lists electrical components alphabetically by reference designator and provides the Agilent part number followed by the part description Mechanical parts are placed after the electrical parts and listed alphabetically by part description Unless otherwise specified a listed part is used in all models of the
64. 14V 66 U608 7 DP CONTROL Sheet 3 CV Mode CC Mode 13V OV 67 U630 11 PREF 2 Sheets 1 3 1V 68 630 12 DN PGM Sheets 1 3 69 D660 AN DP_TST Sheet 3 OV 79 0630 10 OV COMPARATOR CV Mode CC Mode Sheet 3 1 5V 43 25V 124 Diagrams General Schematic Notes The following table lists summary information about notes appearing in schematic diagrams Table 6 4 General Schematic Notes All resistors are in ohms 1 1 8W unless otherwise specified All capacitors are in microfarads unless otherwise specified 3 Signal lines that are terminated by flags continue on other sheets and may also go to other locations on the same sheet Example CVPROG SH 2 8C SH 2 8C indicates the sheet number and the coordinates on that sheet where the CVPROG signal line goes 4 Unterminated signal lines go to a least one other location on the same sheet 5 Unless otherwise noted bias connections to integrated circuit packages are as follows pur Common 5V 14 pin packages 7 14 16 pin packages pin 8 pin 16 20 pin packages pin 10 pin 20 Diagrams 125 2 00 v div 5 00 v 5 00 us div 25 00 us 2 00 v div 0 00 v 5 00 ua div 9 000 us 2 00 V etv 0 00 Y tt l F Td Tl EXSET TT 1 00 ua div 5 000 TEST POINT TEST POINT 64 2 00 Y div 5 00 v TEST POINT 5 00 us div 25 00 us 5 00 us div 9 000 us 2 00 V siv 0 00 v 5 00 us div 25 00 u Pil F r k LJ EE
65. 1J4 and 115 3 Remove nuts securing the AIG1 AIG2 controls to the board and remove controls 70 Troubleshooting A1KPD Keypad 1 Remove the A1 Front Panel Board as described in that procedure 2 With board removed keypad can easily be lifted out of the Front Panel Assembly Rear Panel and or A2 GPIB or Isolator Board To remove these two assemblies together proceed as follows Disconnect the cables from the following connectors on the A2 board a Ac bias cable W6 from P101 or J803 on 657 b Phone cable W4 from J107 or J800 on 657 c Phone cable W5 from J108 or J801 on 657xA Remove the AC input safety cover 2 screws and line cord connections on rear panel Remove the DC output safety cover 4 screws and the Output and LS sense connections on the rear panel Remove the quick disconnect plug if present from the analog connector near OUT terminal on rear panel Remove two screws securing the plastic output name plate to the bus bars Remove two screws securing the heatsink assembly brackets to rear panel Remove the nut securing the ground wire to the Output Signal ground terminal on the rear panel Remove two screws one on each side securing the rear panel to the chassis and remove the Rear Panel A2 board Qo cM QN D IND To remove only the A2 board proceed as follows Disconnect cables from the A2 board as described in Step 1 Remove two screws securing A2 board to rear panel 667xA Only
66. 225 40 3501A 00796 38 Model 6675A 3620A 01006 39 3634 01086 40 3138 00101 713 Model 6674 3149 00116 9 3216 00136 7 3126 00131 1 13 3234 00156 12 3144 00181 2 3242 00191 14 3146 00191 3 5 9 3350 00221 35 3208 00103 5 19 22 36 3215 00251 7 3502 00551 38 3216 00261 12 3619 00796 39 3216 00331 _14 3632A00932 _40 CHANGE 1 In Table 5 9 CHANGE Capacitor from 100pF 5 Agilent P N 0160 4801 to resistor zero ohm Agilent P N 8159 0005 Circuit Reference C506 NOTE The resistor will be inserted where the capacitor was Wire Agilent P N 8150 2408 is hand wired from 1509 pin 16 to 0502 pin 12 In Table 5 7 DELETE Resistor 100 ohms 0 1 0 125 watt Agilent P N 0757 0401 R383 CHANGE 2 In Table 5 3 CHANGE From 5060 3422 to 5060 3367 CHANGE From 5060 3334 to 5060 3385 CHANGE 3 In Table 5 9 ADD 1 Resistor R550 4 99K 1 1 8W Agilent P N 0698 3279 Qty 1 Located in C506 position 2 Jumper 26ga Agilent P N 8150 2408 or equivalent Qty 1 5inch between C741 and R550 DELETE Resistor REF C506 Zero Ohm Agilent PIN 8159 0005 Qty 1 148 Backdating CHANGE 4 In Table 5 9 DELETE IC Socket 40 Pin REF U504 Agilent P N 1200 0552 Qty 1 ADD 1 Resistor R885 2 0K 1 1 8W Agilent P N 0757 0283 Qty 1 2 Resistor R862 3 01K 1 1 8W Agilent P N 0757 0273 Qty 1 3 Resistor R861 267 Ohm 1 1 8W Agilent P N 0698 4446 Qty 1 4 Resisto
67. 252 2320 Connector Receptacle GPIB J106 1251 4926 Connector Receptacle Test Header J107 1251 7330 Connector Receptacle J108 1251 7330 Connector Receptacle 3114 1251 7330 Connector Receptacle J115 1251 7330 Connector Receptacle P101 1251 4245 Connector Plug 2 pin AC Bias U110 U111 1990 0444 IC Optoisolator U113 1990 0543 IC Optoisolator U117 1820 2549 IC Optoisolator U118 1820 4185 IC Optoisolator U121 1820 0430 IC Voltage regulator TB101 0360 2312 Terminal Block Digital Control MECHANICAL PARTS 1205 0758 Heatsink U121 0535 0031 Nut hex w lockwasher J101 0515 0642 Screw 0121 0515 0911 Screw M3x0 5 J101 Note All other parts are surface mounted and are not field repairable 94 Replaceable Parts Table 5 7 A3 FET Board Replaceable Parts Ref Desig Agilent Part No Description ELECTRICAL PARTS C201 0160 7505 Capacitor 7uF 5 200V C202 0180 4132 Capacitor 6 84F 35V C203 0160 4835 Capacitor 0 10 50V 204 205 0160 5098 Capacitor 0 22uF 10 206 0180 4132 Capacitor 6 8uF 35V C207 209 0160 2006 Capacitor 100pF 10 210 211 213 214 0160 6838 Capacitor 2200pF IKV C215 216 0160 2006 Capacitor 100pF 10 C217 0160 5098 Capacitor 0 22uF 10 C218 0160 4835 Capacitor 0 1uF 10 50V C219 0160 2006 Capacitor 100pF 10 0220222 0180 4132 Capacitor 6 8uF 35V C221 0160 5098 C
68. 2K 1 0698 3260 Resistor 464K 1 0698 8827 Resistor 1 M 1 0 125W 0757 0472 Resistor 200K 1 0757 0453 Resistor 30 1K 1 0698 1254 Resistor 536K 1 0757 0480 Resistor 432K 1 0699 1254 Resistor 536K 1 0 125W 0699 0070 Resistor 3 16 M 1 0757 0442 Resistor 10K 1 0 125W 0757 0451 Resistor 24 4K 1 0698 3450 Resistor 42 2K 1 0757 0462 Resistor 75K 1 0 125W 0698 3460 Resistor 422K 1 0698 8827 Resistor 1M 1 0 125W 0699 0070 Resistor 3 16M 1 Not used 0698 3558 Resistor 4 02K 1 0 125W 0757 0442 Resistor 10K 1 0699 0070 Resistor 3 16 M 1 0757 0468 Resistor 130K 1 0 125W 0698 4536 Resistor 340K 1 8159 0005 Resistor 0 0698 8827 Resistor 1 M 1 0 125W 8159 0005 Resistor 0 0699 0070 Resistor 3 16 M 1 Not used Replaceable Parts 107 Table 5 9 A5 Control Board Replaceable Parts continued Ref Desig R698 R699 R702 Model specific 6571A 6671A 6572A 6575A 6672A 6675A R703 Model specific 6571A 6671A 6572A 6575A 6672A 6675A R710 R712 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A R713 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A R715 R717 R718 R719 Model specific 6571A 6671A 6572A 6574A 6672A 6674A 6575A 6675A R720 R721 722 R723 724 R730 731 Model specific 6571A 6671A 6572A 6672A 6573 6673
69. 3 Change Knob for G1 and G2 to part number 0370 1091 In Table 5 4 on page 96 Change U4 to part number 5080 2208 CHANGE 40 In Table 5 9 on page 106 and on schematic Figure 6 12 Delete C691 and 692 Backdating 155 Table A 1 A2 GPIB Parts List Ref Desig Agilent Part No Description ELECTRICAL PARTS C102 105 0160 4822 Capacitor 1000 5 106 0180 0155 Capacitor 2 2uF 20V C107 108 0160 4787 Capacitor 22pF 596 100V C109 111 114 115 121 0160 5422 Capacitor 0 047uF 20 C122 0180 3325 Capacitor 25V C123 0160 4822 Capacitor 1000 5 124 0180 0228 Capacitor 22 15V C125 0160 5422 Capacitor 0 047uF 20 C126 127 0160 4807 Capacitor 33pF 5 100V C128 0160 4281 Capacitor 2200pF 20 C129 134 0160 5422 Capacitor 0 047uF 20 C135 0180 0228 Capacitor 22 15V C136 0160 4803 Capacitor 68pF 5 100V C138 140 0160 5422 Capacitor 0 047uF 20 D107 110 1901 0731 Diode power rectifier D111 114 1901 1098 Diode 1N4150 D115 116 1901 1080 Diode 1N5817 D119 120 1902 0766 Diode zener 18 2V 5 F101 2110 0699 Fuse subminature 5AM 125V 1101 1252 0268 Connector receptacle GPIB J106 1251 4926 Connector receptacle test header J107 108 114 115 1251 7330 Connector receptacle phone L101 9100 1610 Inductor 150nH 20 P101 1251 4245 Connector plug 2 pin ac bias Q101 1853 0089 Transistor PNP 2N4917 R103 0757 0442 Resistor 10K 1 0 125W R104 0698 3155 Resistor 4 64K 1 R105 0683 1065 Resistor 10M 5 0 25 W R106 0698 4037 Resistor 46 4 0
70. 3 nek R604 ae EE Z ND613 lt 30 1K 6 TLS98 FET BD 5 22PF 0 1 RT 15U 150 1000 500 21 5K TRANSFORMER V R621 C736 4 jll ouT2 J503 2 15V V C602 GND PGND 200 16994 14K E UFSC R612 10 JS10 18 22 550 R840 V 3 01K 100U 1000 IMON C gt UFSC Z 5829 PWM PWM PWM 1 21M MID BAND 14 3U MC a N 2 eq M zT 7ND611 570612 GAIN BOOS J510 13 onn e A d bt s OU COMPARATOR R694 D680 ZND689 570610 11 6V DOWN PROGRAMMER CONTROL CIRCUIT y 14 30 R685 0602 GATE R678 oea J510 3 E 42 2K ae wd 1 R680 0 1 R688 _ 411 0609 4 990 240 14 30 500 A yh 6 UDP i 10 R679 655 Re82 li V UDP 4 64K 4700PF 3 65K bep R689 R690 R682 in EOS 14 3 42 2K R834 R684 J509 7 1K 4 99K V DP SHUNT J 09 S P VDP 0PS J510 1 14 3U Jo10 2 Figure 6 12 A5 Board Switch Downprog amp OV Monitor Schematic sheet 3 0901 DOO G dR938 O Q fe 4 m R907 949370 ceso e e cp 59522 m 10 R991 R995 90 b R993 R994 R992 90 6 Oc991 O M ooo R990 Figure 6 13 A6 Output Fi
71. 40K 1 Resistor 182K 1 Resistor 261K 1 Resistor 40K 0 1 0 1W Resistor 0 1 0 1W F Resistor 100 Q 0 1 Resistor 16 2K 1 Resistor 130K 1 Resistor 75K 1 0 125W Resistor 130K 1 Resistor 19K 0 05 Resistor 25K 0 05 Replaceable Parts 109 Table 5 9 A5 Control Board Replaceable Parts continued Ref Desig R807 R808 R809 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A R810 R820 821 R822 823 R824 825 R827 R862 R893 R894 895 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6575A 6674A 6675A R896 U502 U503 Agilent Part No Description ELECTRICAL PARTS 0698 8827 Resistor 1M 1 0 125W 0757 0407 Resistor 200 Q 1 0 125W 0699 0489 Resistor 16 15K 0 01 0699 3103 Resistor 19K 0 05 0699 0489 Resistor 16 15K 0 01 0699 1510 Resistor 22 2K 0 05 0698 8093 Resistor 40K 0 1 0 1W 0757 0460 Resistor 61 9K 1 0698 3450 Resistor 42 2K 1 0757 0442 Resistor 10K 1 0 125W 0698 4123 Resistor 499 0 125W 0757 0453 Resistor 30 1K 1 0757 0429 Resistor 1 82K 1 0757 0273 Resistor 3 01K 1 0698 3450 Resistor 42 2K 1 0757 0280 Resistor 1K 1 0 125W 0757 0465 Resistor 100K 1 0698 4479 Resistor 14K 1 0 125W 0698 3456 Resistor 287K 1 0699 0088 Resistor 1 2M 1 0698 8827 Resistor 1 M 1 0 125W 0698 3155 Resistor 4 64K 1 0757 0472 Resistor 200K 1 0698 3279 Resistor 4 99K 1 0683 2255 Resistor 2 2M 5 0 25W 0698 0082 Res
72. 42 Resistor 10K 1 0 125W R680 0698 3279 Resistor 4 99K 1 R682 Model specific 6571A 6671A 0757 0123 Resistor 34 8K 1 6572A 6672A 0698 3450 Resistor 42 2K 1 6573A 6673A 0757 0124 Resistor 39 2K 1 6574A 6674A 0698 3450 Resistor 42 2K 1 6575A 6675A 0698 3162 Resistor 46 4K 1 106 Replaceable Parts Table 5 9 A5 Control Board Replaceable Parts continued Ref Desig R685 Model specific 6571A 6574A 6671A 6674A 6575A 6675A R687 Model specific 6571A 6574A 6671A 6674A 6575A 6675A R688 R689 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A R690 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A R691 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A R692 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575 6675A R693 Model specific 6571A 6574A 6671A 6674A 6575 6675A R694 R696 Model specific 6571A 6574A 6671A 6674A 6575A 6675A R697 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A Agilent Part No Description ELECTRICAL PARTS 0757 0410 Resistor 301 Q 1 0 125W 0757 0413 Resistor 392 Q 1 0 125W 0757 0434 Resistor 3 65K 1 0757 0443 Resistor 11K 1 0757 0429 Resistor 1 82K 1 0757 0472 Resistor 200K 1 0698 3450 Resistor 42
73. 422 Capacitor 0 047uF 20 C801 0160 4822 Capacitor 1000 5 C802 0160 4822 Capacitor 1000 5 C803 0180 3167 Capacitor 1000 25V C804 0180 4129 Capacitor 1uF 35V C805 0160 5422 Capacitor 0 047uF 20 C806 0160 5422 Capacitor 0 047uF 20 CR800 1901 0731 Diode power rectifier CR801 1901 0731 Diode power rectifier CR802 1901 0731 Diode power rectifier CR803 1901 0731 Diode power rectifier F800 2110 0951 Fuse subminature 5 AT J800 801 1251 8184 Receptacle modular phone J802 1251 4926 Connector test point header J803 1251 4245 Connector 2 pin male R800 0757 0401 Resistor 100 Q 1 0 125W R801 0698 3155 Resistor 4 64K 1 R802 0698 3155 Resistor 4 64K 1 R803 0698 0082 Resistor 464 Q 1 0 125W R804 0698 0082 Resistor 464 1 0 125W R805 0698 3155 Resistor 4 64K 1 R806 0698 3155 Resistor 4 64K 1 R807 0698 3155 Resistor 4 64K 1 U800 1990 0543 IC Opto isolator U801 1990 0444 IC Opto isolator U802 1990 0444 IC Opto isolator U803 1820 1201 IC SN74LS08N U804 1820 1438 IC SN74LS257N U805 1826 0122 IC UA7805UC 5060 2948 Heat sink assembly TO 220 U805 1205 0282 Heat sink Replaceable Parts 93 Table 5 6 A2 GPIB Board Replaceable Parts see Note Ref Desig Agilent Part No Description ELECTRICAL PARTS C122 0180 4606 Capacitor 10 000uF C128 0160 4281 Capacitor 2 200pF F101 2110 0699 Fuse Subminature 5AM J101 1
74. 52 R761 762 R765 R766 R767 Model specific 6571 6573 6671 6673 6574 6674 6575 6675A R768 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674 6575A 6675A R769 R770 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674 6575A 6675A R785 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A R790 791 R792 793 R794 795 R801 R802 R803 R804 R805 Model specific 6571A 6671A 6572A 6575A 6672A 6675A ELECTRICA 0757 0280 0757 0429 0698 3279 0757 0442 0757 0447 0698 8093 0757 0199 0698 3430 8159 0005 0698 8093 0699 1741 0699 0055 0699 1741 0757 0410 0699 0083 0699 0211 0698 7163 0698 3279 0698 3155 0757 0429 0757 0419 0757 0472 0757 0473 0698 4536 0757 0471 0698 3455 0698 8093 0698 6414 0698 6323 0757 0447 0757 0468 0757 0462 0757 0468 0699 3103 0699 2246 L PARTS Resistor 1K 1 0 125W Resistor 1 82K 1 Resistor 4 99K 1 Resistor 10 1 0 125W Resistor 16 2K 1 Resistor 40K 0 1 0 1W Resistor 21 5K 1 Resistor 21 5 1 Resistor 0 Resistor 40K 0 1 0 1W Resistor 5 657K 0 1 Resistor 4 53K 0 1 Resistor 5 657K 0 1 Resistor 301 Q 1 0 125W Resistor 681 Q 0 1 0 1W Resistor 859 Q 0 1 Resistor 2 0081K 0 1 Resistor 4 99K 1 Resistor 4 64K 1 Resistor 1 82K 1 Resistor 681 Q 0 1 0 125W Resistor 200K 1 Resistor 221K 1 Resistor 3
75. 653A Electronic Load Range Voltage and current range must exceed that of supply under test Power 2KW minimum Agilent 6571A 6574A 6671A 6674A Agilent 6575A 6675A Oscilloscope Sensitivity 1mV Bandwidth Limit 20MHz Probe 1 1 with RF tip RMS Voltmeter True RMS Bandwidth 20MHz Sensitivity 100 uV 1 Agilent 6050B mainframe with 3 Agilent 6040A modules 2 Agilent 6050B mainframe with 3 Agilent 60507B modules plus 1 Agilent 6051A mainframe with 1 60507B module Agilent 54504A Agilent 3400B Variable Voltage Transformer Power 4KVA minimum Range 13 to 6 of input GPIB Controller Full GPIB capabilities HP Series 300 or Vectra with and Required for Operation Verification Tests Required for remote testing of 667xA models GPIB card Electronic Load Many of the test procedures require the use of a variable load capable of dissipating the required power If a variable resistor is used switches must be used for connecting disconnecting and shorting the load resistor For most tests an electronic load see Table 2 1 is easier to use than a variable resistor However an electronic load may not be fast enough for testing transient recovery time or may be too noisy for testing noise PARD In these cases fixed load resistors of suitable power dissipation can be used with minor changes to the test procedures given in this chapter 12 Verification Programming the Test
76. 664000229000 35 heh 35 SECONDARY HEUS RETE RED DER E REO HE OBERE 35 SEC sock seeds eie optet ote in tete CRDI 35 160 Index SERIAL DOWN Ae ee el a A 35 SERIAL TIMOUT betas coehssess GRER DINER RA T PURI 35 TEMP ass 35 OVERRUN si aed ad reel NL nka snap Susa ems 35 UART ed ee Neal a eee am ep ee i ee 35 error message SelftfeSt a ayaqa 35 errors hama 36 epp ch den 36 ESD 1 2 3 1 F factory calibration constants ertet e R susp ER 67 ALMA WATE TE VISIONS novi bee tee cB EES 12 firmware TeVIsIoDs SACRE eo Te eee iere perd oa Sods 60 Form u ee pere h 27 front panel EEPROM factory cal location is feces eof shen c eb tte e e e i o sages cp RU Seedy e e p ved terrd 68 initialization OF dE E 68 transferring constants to erp te RE 68 front panel operation ur tr E EE 11 front panel testigo ese
77. 8 8672 Resistor 243 4 0 1 330 331 8159 0005 Resistor 0 Q R332 0764 0041 Resistor 30 Q 5 2W R333 8159 0005 Resistor 0 Q R339 0698 3155 Resistor 4 64K 1 R350 0757 0434 Resistor 3 65K 1 98 Replaceable Parts Table 5 8 A4 AC Input Board Replaceable Parts continued Ref Desig Agilent Part No Description ELECTRICAL PARTS continued R351 0698 3155 Resistor 4 64K 1 R352 0757 0280 Resistor 1K 1 0 125W R361 0698 5090 Resistor 43K 1 0 125W R362 0698 3201 Resistor 80K 1 0 125W R363 0698 5090 Resistor 43K 1 0 125W R364 0764 0015 Resistor 560 Q 5 2W R367 0757 0401 Resistor 100 Q 1 0 125W R368 0757 0444 Resistor 12 1K 1 R369 370 0698 8812 Resistor 1 1 0 25W F R371 372 0757 0465 Resistor 100K 1 R373 0757 0401 Resistor 100 Q 1 0 125W R374 0698 3155 Resistor 4 64K 1 R375 376 0757 0346 Resistor 10 Q 1 0 125W R377 0698 3642 Resistor 3K 5 2W R378 0683 6845 Resistor 680K 5 0 25W R379 0698 3155 Resistor 4 64K 1 R380 0698 3620 Resistor 100 Q 5 2W R381 0698 4150 Resistor 115 Q 1 0 25W R382 0683 3305 Resistor 33 Q 5 0 25W R383 0757 0401 Resistor 100 Q 1 0 125W R384 0757 0280 Resistor 1K 1 0 125 W R399 0699 0208 Resistor 1 560 0 25W R400 401 0699 3191 Resistor 27 5 20W R404 0764 0028 Resistor 100K 5 2W R409 0811 1918 Resistor 30K 5 10W R414 0811 1666 Resistor 1 Q 5 2W RT300 0837 0412 Thermistor SW300 3101 2828 Switch DPDT line voltage selec
78. 95K 1x 17104 lt OUT 0695 asu jer 1009 C691 R740 R730 SOLDER DO_NOT 10K MASK RELIEF NZD676 2 2 LOAD 500 R732 e 100U r e ux 1 Wt 1100 R791 c717 40K C852 p854 E T w 1000PF 554 250VAC V 61 9K 8 U618 4 LF412 Z7ND665 15V Figure 6 12 A5 Board CV CC Control Circuits Schematic sheet 2 RAMP GENERATOR C624 69 ER amp DEADTIME LATCH 100 6800PF 500 0 1 50V 15U 988 RE34 ON LATCH P O OUTPUT BD Ed REES CONNECTOR SU 1 40UT gt 3J510 12 C600 5 C60 0UT CJ 510 11 r d PWM IC T AEN ste M 366 URG ISEN C 3J510 5 11 18 R623 C733 UC UCC 150 C750 tinnu 124 ie 1000 FAST SENSE ANS lt R601 deale _ R631 16 2K AURS 3 01K C554 c gt 11 6V DIF AMP 2 13 pe Koon oc 5 1 mr 42 2K 1510 20 ll 0621 8 221K SUMMING j C610 L R624 1 gt FDBK UFSC bes 3 C631 6051 Ze REM C855 COMPARA OR LM311 4 1l C553 LF412 4 TZ 2PF C751 16 120 L R831 1000 5050 7 C735 94 V 5252 1 8ek 195 470PF PHM 15 INUP FILTER 0 1 R652 pie 3 01 R609 50 lI J510 19 J503 1 R871 UFSC C700 221K taj Hk Ser Bn 1150 21 5 Trogopr C601 100U R65
79. 98 3572 Resistor 60 4K 1 R269 0698 4121 Resistor 11 3K 1 R270 0757 0424 Resistor 1 1K 1 R271 0757 0200 Resistor 5 62K 1 R272 0757 0442 Resistor 10K 1 0 125W R273 275 0757 0437 Resistor 4 75K 1 R285 8159 0005 Resistor O Q R299 0698 3646 Resistor 12K 5 2W RV200 0837 0442 Varistor 18V T202 9100 4350 Transformer current T204 06624 80091 Transformer pulse 96 Replaceable Parts Table 5 7 A3 FET Board Replaceable Parts continued Ref Desig Agilent Part No Description ELECTRICAL PARTS continued U201 202 1820 8433 IC pulse width modulator U203 1826 1343 IC voltage regulator U204 1826 0138 IC comparator VR201 1902 1390 Diode zener 6 2V 2 5080 2178 Cable assembly output rails MECHANICAL PARTS 2110 0726 Fuse clip for TB201 5020 2741 Heatsink FET m 0340 0458 Insulator FETs to heat sink 0515 0375 Screw mch FET to socket 0515 0433 Screw mch A3 FET bd 1200 1158 Socket FETs to heat sink 0380 1524 Standoff hex 8mm FET to A3 bd 3050 0893 Washer flat FET bd 2190 0586 Washer lock hlcl A3 FET bd Replaceable Parts 97 Table 5 8 A4 AC Input Board Replaceable Parts Ref Desig Agilent Part No Description ELECTRICAL PARTS C304 0160 4834 Capacitor 047uF 10 C305 0180 3458 Capacitor 4700UF 50V C306 307 0180 4129 Capacitor 35V C309 0180 4136 Capacitor
80. A 6574 6674A 6575A 6675A R732 733 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6575A 6674A 6675A Agilent Part No Description ELECTRICAL PARTS 0699 0070 Resistor 3 16 M 1 0699 0088 Resistor 1 2 M 1 0757 0429 Resistor 1 82K 1 0757 0280 Resistor 1K 1 0 125W 0699 1254 Resistor 536K 0698 3162 Resistor 46 4K 1 0698 3155 Resistor 4 64K 1 0757 0460 Resistor 61 9K 1 0757 0458 Resistor 51 1K 1 0698 3454 Resistor 215K 1 0757 0469 Resistor 150K 1 0757 0280 Resistor 1K 1 0 125W 0698 8827 Resistor 1M 1 0 125W 0699 0088 Resistor 1 21M 1 0683 2755 Resistor 2 7M 1 0 25W 0683 6855 Resistor 6 8M 5 0 25W 0698 3279 Resistor 4 99K 1 0699 0070 Resistor 3 16M 1 0699 0461 Resistor 30K 0 1 0 1W 0699 0460 Resistor 85K 0 1 0 1W 0699 1211 Resistor 95K 0 1 0699 2295 Resistor 100K 0 1 0 1W 0699 2247 Resistor 121K 0 05 0699 0461 Resistor 30K 0 1 0 1W 0757 0468 Resistor 130K 1 0699 2246 Resistor 25K 0 05 0699 1513 Resistor 40K 0 05 0 1W 0699 2248 Resistor 47 5K 0 05 0699 1510 Resistor 22 22K 0 05 0698 7163 Resistor 2 0081K 0 1 0699 0924 Resistor 11K 0 1 0698 3956 Resistor 42 5K 0 1 0698 6342 Resistor 90K 1 108 Replaceable Parts Table 5 9 A5 Control Board Replaceable Parts continued Ref Desig Agilent Part No Description R740 741 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A R750 R7
81. AN SENSE The readback DAC circuit is controlled by the microprocessor to successively approximate to 12 bit resolution the value of each signal monitored The CVPROG and CCPROG signals are used during self test to check operation of the DAC OP amplifier circuits The microprocessor monitors the fan speed FAN SENSE and the supply s ambient temperature AMB SENSE in order to generate a PWM control signal The pulse width of PWM is varied according to the ambient temperature The signal is applied to the fan speed control circuit on the A4 AC Input Board to increase the fan speed as temperature increases and decrease the fan speed as temperature decreases The Secondary Microprocessor generates OVPROG a pulse width modulated signal that represents the programmed overvoltage protection level OVPROG is processed by Programmed GAL U502 and U517 to produce OVREF which is sent to an OV Comparator circuit U630 in A5 Control Board schematic Sheet 3 This circuit compares the actual output voltage level with OVREF When the output voltage exceeds OVREF the OV comparator circuit produces a low level OVCMP signal which is applied to the Programmed GAL A5 Control Board schematic Sheet 1 When OVCMP goes true the GAL circuit produces a high level OVSCR signal that causes the following actions to occur Principles Of Operation 79 The supply s output is downprogrammed e The pulse width modulator described later is disabled e
82. ARY DN EEPROM write failure Serial data line failure on Main board A double asterisk indicates that the item applies only to 667xA system supplies Troubleshooting 31 Troubleshooting Charts Figure 3 1 gives overall troubleshooting procedures to isolate the fault to a circuit board or particular circuit see Figure 3 20 for the location of the circuit boards These procedures include the use of power on selftest Table 3 2 and signature analysis techniques Table 3 5 through Table 3 7 Some results of Figure 3 1 lead to more detailed troubleshooting charts that guide you to specific components The troubleshooting charts are organized as follows Chart Trouble or Circuit Figure 3 1 Overall procedure checks selftest errors calibration errors ac input circuit fan readback circuits 5 Control Board GPIB cable digital port serial link rotary controls current amplifier Figure 3 2 No display from Figure 3 1 Figure 3 3 OV circuit not firing from Figure 3 1 Figure 3 4 OV circuit is on at turn on from Figure 3 1 Figure 3 5 Output level is held low from Figure 3 1 Figure 3 6 Output level is held high from Figure 3 1 Figure 3 7 DAC circuits from Figure 3 1 Figure 3 8 DAC test waveforms Figure 3 9 CV and CC DAC and amplifiers from Figure 3 1 Figure 3 10 Serial interface circuit from Figure 3 1 Figure 3 11 Isolator board circuits Figure 3 12 Secondary interface
83. AT A5U609 1 AND A5U608 1 WITH RESPECT TO SECONDARY COMMON SEE TABLE 6 3 50606 7 CHECK A5U608 18V CHECK A5U609 re NO CHECK 50608 AGRON R912 CHECK 50602 60901 902 Figure 3 13 Slow Downprogramming Troubleshooting 52 Troubleshooting CV CC Status Annunciators Troubleshooting When troubleshooting the CV CC status annunciators or status readback circuits first measure the voltage drop across the gating diodes which A5D615 for the CC circuit and A5D620 for the CV circuit see 5 Control Board schematic diagram Sheet 2 A conducting diode indicates an active ON control circuit This forward drop is applied to the input of the associated status comparator A5U630 and drives the output low The low signal indicates an active status which is sent to the secondary microprocessor A5U504 via Programmed GAL A5U502 see schematic Sheet 1 The front panel CV annunciator lights when the CV mode is active CV is low and the CC annunciator lights when the CC mode is active CC is low If neither is active the UNREGULATED Unr annunciator comes on A5 Control Board Troubleshooting Setup Several troubleshooting procedures in this chapter require you to gain access to the components and test points on the A5 Control Board To do this follow the procedure given in Table 3 3 To gain access to components and test points on the A5 Control Board proceed as follows Turn off power supply and remove t
84. CIRCUITS ON FRONT PANEL BOARD A1 TURN ON SUPPLY AND CHECK FOR PULSES A3A1U3 17 18 SEE FIG 3 15 CHECK CABLE W5 YES PULSES AT A3A1 3 18 CHECK ASUU SUPPLY OPERATES PROPERLY TURN OFF SUPPLY AND RETURN CABLES W4 AND 5 TO THEIR ORIGINAL POSITIONS GO TO TROUBLE SHOOTING ISOLATOR BOARO SYSTEM POWER SUPPLY TURN SUPPLY ON AND CHECK PCLR SIGNAL AT A2U101 8 TEST POINT SEE TABLE 6 3 ON THE GPIB 8OARD ALSO CHECK 12MHz SIGNAL AT 20114 6 NO Y CHECK A2U101 CHECK A2C107 C108 Y101 CHECK FOR ANY ACTIVITY PULSES ON OATA ADDRESS LINES TO INDICATE THAT PRIMARY MICROPROCESSOR A2U114 IS OPERATING CHECK A2UTM Ult 1 06 1120 USE OHMMETER TO CHECK FOR UNES SHORTED TO 5 OR COMMON IF NO SHORTED LINES ARE FOUND REPLACE 2 44 SEE NOTE 2 NOTES 1 IF SECONDARY ON APPEARS ON THE DISPLAY FIRST AND THEN SERIAL DOWN IS DISPLAYED GO TO FIGURE 3 15 2 IF THIS DOES NOT FIX THE PROBLEM REPLACING THE A2 GPIB BOARD MAY BE THE MOST COST GO TO SHEET 2 CHECK FOR THE PRESENCE OF CLOCK PULSES AT THE FOLLOWING CIRCUT POINTS ON THE A2 GPIB BOARD EFFECTIVE SOLUTION SYSTEMS POWER SUPPUES ONLY Figure 3 10 Serial Down Troubleshooting Sheet 1 of 2 Troubleshooting 47 FROM SHEET 1 CLK PULSES AT A2U119 17 NO CHECK A2U114 U119 YES 1MHz CLK PULSES AT
85. CTS THE FRONT PANEL DIRECTLY TO THE CONTROL BOARD SEE WARNING TU TH PLY AND TRY TO PROGRAM THE XNOTE perdes Te FRONT PANEL FOR ANALOG PROGRAMMABLE SUPPLIES WS FROM J801 NOTE GPIB BOARD IS ISOLATOR BOARD CHECK 2 GPIB OR ISOLATOR BOARD BIAS CIRCUITS AND PCLR SIGNAL TEST POINTS CT 4 TABLE 6 3 CHECK CABLE W4 SUPPLY OPERATES PROPERLY TURN OFF THE SUPPLY IN ORDER TO ACCESS CIRCUITS A1FRONT PANEL BOARD REMOVE A1 FRONT PANEL ASSEMBLY TURN ON THE SUPPLY CHECK 5V BIAS AT R1 6 CONNECT METER COMMON TO Rt 3 SEE FIG 6 8 CHECK THE FOLLOWING DISPLAY VOLTAGES 1 AT At 14 2 2 AT 1 2 DISPLAY amp BIAS VOLTAGES CHECK AICI R1 RTI YES CHECK PCLR RESET A2U2 16 5v CHECK A1U502 U504 A2U800 U804 CHECK 12 MHz CLOCK SIGNAL AT A1U3 66 SEE FIG 3 17 SHEET 2 CHECK AtY1 C3 C4 03 CONNECT EXTERNAL VOLTMETER TO OUTPUT TERMINALS PROGRAM OUTPUT VOLTAGE AND CURRENT AT THE FRONT PANEL AND MEASURE VOLTAGE AT SUPPLY OUTPUT TERMINALS IF THE OUTPUT IS DISABLED PESS OUTPUT KEY 5 OUTPUT VOLTAGE PRESENT LCD DSP1 OR CABLE W2 IS DEFECTIVE 3 U4 OR UB DEFECTIVE PERFORM FRONT PANEL SA SEE TABLE 3 6 Figure 3 2 No Display Troubleshooting Troubleshooting 37 START OV WILL NOT FIRE TURN OFF SUPPLY REMOVE TOP COVER AND RF SHIELD TURN ON SUPPLY AND CHECK B
86. CV Tests continued Action Normal Result Transient Recovery Time This test measures the time required for the output voltage to return to within 100mV of its final value following a 50 change in output load current Measurements are made on both the unloading transient from full load to 1 2 load and the loading transient from 1 2 load to full load 1 Turn off the power supply and connect an oscilloscope across LS and LS see Figure 2 1A 2 Turn on the power supply and program the current to its maximum programmable value and the voltage to its full scale value see Table 2 2 Operating mode to constant current Input load current to 1 2 the supply s full rated output current Transient current level to the supply s full rated output current Transient generator frequency 100Hz Transient generator duty cycle 50 10 4 Turn on the transient and adjust the oscilloscope to display response See Figure 2 2 waveform o Program the Electronic Load as follows 5 Measure both the loading and unloading transients by triggering the Specified voltage level is reached within oscilloscope on both the negative and positive slopes of the transient 900us Record the voltage level obtained at the 900 us interval UNLOADING TRANSIENT R49 NOMINAL ju VOLTAGE LOADING TRANSIENT Figure 2 2 Transient Response Waveform 18 Verification Constant Current CC Tests
87. Capacitor 0 047uF 20 C513 0160 4801 Capacitor 100pF 5 C515 0160 5422 Capacitor 0 047 20 C516 0160 4801 Capacitor 100pF 5 C515 517 518 0160 5422 Capacitor 0 047 20 C519 0180 4129 Capacitor 1uF 35V 520 521 0160 5469 Capacitor 10 50 523 0160 4846 Capacitor 1500pF 100V C524 0160 5422 Capacitor 0 047 20 C530 0180 4129 Capacitor 1uF 35V 0531532 0160 5422 Capacitor 0 047uF 20 C533 0180 4131 Capacitor 4 7uF 35V C550 555 0160 4835 Capacitor 0 1 10 50V C556 558 0180 4129 Capacitor 35V C600 0180 4131 Capacitor 4 7 35V C601 0160 4835 Capacitor 0 1 10 50V C602 0160 4805 Capacitor 47pF 5 100V C603 604 0160 4810 Capacitor 330pF 5 C610 0160 4807 Capacitor 33pF 5 100V C620 0160 4904 Capacitor 6800pF 5 C621 0160 4791 Capacitor 10 5 100V C622 0160 4795 Capacitor 4 7pF C623 0160 4904 Capacitor 6800pF 5 C624 0160 4787 Capacitor 22pF 5 100V C625 0160 4795 Capacitor 4 7pF C626 0180 4129 Capacitor 35V C630 Model specific 6571A 6573A 0160 4801 Capacitor 100pF 5 6671A 6673A 6574A 6575A 0160 4787 Capacitor 22pF 5 6674A 6675A C631 0160 4799 Capacitor 2 2pF C632 Model specific 6571A 6573A 0160 4801 Capacitor 100 5 6671A 6673A 6574A 6575A 0160 4787 Capacitor 22pF S 6674A 6675A C655 Model specific 6571A 6574A 0160 4831 Capacitor 4700pF 10 6671A 6674A 6575A 6675A 0160 4819 Capacitor 2200pF 5 Replaceabl
88. DAC U512 6 OUTPUT FIG3 8 GAL Figure 3 8 DAC Test Waveforms Troubleshooting 45 START 19 REF THE CV OR DAC IS DEFECTIVE USE THIS TEST TO SOLATE BETWEEN THE FEEDBACK RESISTOR DAC AND THE AMPUFIER TURN SUPPLY OFF AND TURN IT BACK ON AS TO SKIP SELF TEST WAIT FOR POWER ON INIT TO COMPLETE CAC OP AMP PROGRAM CURRENT A5U507 A5US08 LL ce ASUSO9 5050 I PIN 2 gt WITH IS PIN YES RESPECT TO 6 2TO 8 IS PIN 2 lt mV WITH RESPECT TO PIN 8 S PIN 6 22 TO sv YES YES 5 NO PIN 2 SHORTED REPLACE DAC TO PIN 87 YES INCONCLUSIVE TEST REPLACE OP AMP Figure 3 9 CV CC DAC and Amplifier Circuit Troubleshooting 46 Troubleshooting START THIS REMOVES THE GPIB OR ISOLATOR BOARD FROM THE DATA PATH CONNECTS THE FRONT PANEL DIRECTLY TO THE CONTROL SOARD THIS CONFIGURATION IS FOR TEST ONLY DO NOT FLOAT THE OUTPUT OR ATTEMPT TO OPERATE OPERATE THE SUPPLY IN THIS CONFIGURATION DISPLAY READS SERIAL DOWN OR SERIAL TIMEOUT SEE NOTE 9 TURN OFF SUPPLY AND REMOVE TOP COVERS AND AFI SHIELD UNPLUG J5 FROM J108 ON THE A2 GPIB BD OR UNPLUG WS FROM J801 ON ISOLATOR BD UNPLUG W4 FROM J502 ON THE AS CONTROL BD PLUG CABLE WS INTO J502 SEE WARNING TURN ON SUPPLY AND TRY TO PROGRAM FROM THE FRONT PANEL TURN OFF SUPPLY REMOVE FRONT PANEL ASSEMBLY TO GAIN ACCESS TO
89. ETECT R531 D530 I v nes J509 1 FAN_SENSE R880 SECONDARY 0 R532 4 9 MICROPROCESSOR C752 1000PF 250VAC DO NOT LOAD i BOUPROG ENABLE COMPARATOR PWM_EN J509 9 INRUSH RELAY CONTROL 2 530 5 509 4 509 11 R606 10U 10K 15U RESET R851 BIAS OK JS509 16 _ NC RS41 1509 10 4 64 15U DETECT 14 NOM J509 3 ee 509 5 509 1 gt 287K 15U 15U DETECT 718 100 509 2 13 43U _5 i J509 6 3 1509 1 GND 505 4 1 0505 25 171021 v 54 FAN_PWM 509 1 FAN PWM 62 DAC REFERENCE popopoopopoopuomoptm pooopooopmopompoonmpno m o 15U R508 10K L 5 L S R506 6 19K 1x 7 15U R507 D 22K 1 54 410517 N 2 11 LM324 50 SECONDARY INTERFACE Us R516 UMON 500 24 18 C520 DB11 RFB 20 Deo R517 IMONC gt 24 K DB7 DB6 C521 DBS OUT1 150 084 AGND C gt CUPROG 1 DB3 DGND D 10 WY R501 READBACK DB2 DB1 287K COMPARATORS DBO 15U IR yer SE E ANAC 017 19 V CONSTANT VOLTAGE D A 15U 50 C512 R513 u 100K R514 18 100K 509 PM 7545 20 DB11 RFB C523 DB10 DBS 1500PF DBB 100U DB7 DB6 DBS OUT1 DB4 AGND gt CCPROG DB3 DGND Zz 1 0 10U DB2 4 DB1 N i DBO 15U 16 iR ure ES 19 CONSTANT CURRENT D A V 50
90. Eprom_data_6x72 820 CASE 6573A 830 RESTORE Eprom_data_6x73 840 CASE 6574A 850 RESTORE Eprom_data_6x74 860 CASE 6575A 870 RESTORE Eprom_data_6x75 880 890 CASE 6671A 900 RESTORE Eprom_data_6x71 910 CASE 6672A 920 RESTORE Eprom_data_6x72 930 CASE 6673A 940 RESTORE Eprom_data_6x73 950 CASE 6674A 960 RESTORE Eprom_data_6x74 970 CASE 6675A 980 RESTORE Eprom_data_6x75 990 1000 CASE ELSE 1010 PRINT Model number not found Program is for Agilent Models 1020 PRINT 6571A 6572A 6573A 6574A and 6575A 1030 PRINT 6671A 6672A 6673A 6674A and 6675A 1040 STOP 1050 END SELECT 1060 1070 FOR I 1 TO 45 Read model dependent data 1080 READ Init data I 1090 IF 1 21 1 32 THEN Init data I 2 V AL Model 1100 NEXTI 1110 1120 OUTPUT Ps CLS 1130 1140 OUTPUT Ps CAL STATE ON Turn on cal mode 0 passcode Figure 3 18 Initialization and Factory Preset Replacement Program Listing Sheet 3 of 6 66 Troubleshooting GOSUB Ps_error Error if passcode is not 0 IF Err THEN OUTPUT Ps IDN Get data from location ENTER Ps Idn Model V AL Idn POS Idn 1 ELSE GOTO START END IF OUTPUT Ps CAL STATE ON Model Turn on cal mode passcode data at model number location GOSUB Ps_error Error if passcode is not same as data at model location IF Err THEN OUTPUT Ps CAL STATE ON Model 1 4 Turn on cal mode passcode model GOSUB Ps er
91. FY SERVICE MANUAL GPIB DC Power Supplies Series 657xA and 667xA For instruments with Serial Numbers Agilent Model 6571A US36520101 and Above Agilent Model 6572A US36350101 and Above Agilent Model 6573A US36330101 and Above Agilent Model 6574A US36340101 and Above Agilent Model 6575A US36340101 and Above Agilent Model 6671A US36400101 and Above Agilent Model 6672A US36390101 and Above Agilent Model 6673A US36380101 and Above Agilent Model 6674A US36370101 and Above Agilent Model 6675A US36370101 and Above For instruments with higher serial numbers a change page may be included For instruments with lower serial numbers see Appendix A Agilent Technologies Agilent Part No 5961 2583 Printed in USA Microfiche Part No 5961 2584 September 2000 CERTIFICATION Agilent Technologies certifies that this product met its published specifications at time of shipment from the factory Agilent Technologies further certifies that its calibration measurements are traceable to the United States National Bureau of Standards to the extent allowed by the calibration facility and to the calibration facilities of other International Standards Organization members WARRANTY This Agilent Technologies hardware product is warranted against defects in material and workmanship for a period of three years from date of delivery Agilent Technologies software and firmware products
92. GES OK TURN OFF THE SUPPLY AND PERFORM AS CONTROL BOARD TROUBLE SHOOTING SETUP TABLE 3 3 SHORT A50U504 1 SA MODE A5U504 20 SEE AG 3 15 TURN ON SUPPLY AND WAIT 2 SECONDS THEN REMOVE SHORT WAIT FOR TO COMPLETE USE A SCOPE TO CHECK THE CV DAC A5U508 8 DAC ASUSI0 6 READBACK DAC 51 512 6 OUTPUTS COMPARE THE WAVEFORMS TAKEN AT THESE POINTS WITH THE WAVEFORMS GIVEN IN FIG 3 8 YES DAC OUTPUT MISSING NO ARE ALL YES DACS MISSING STEPS is OR CC DAC DEFECTIVE YES CHECK REF VOLTAGE FOR READBACK DAC AT ASU517 7 38 WITH RESPECT TO 36 CHECK ASU517 x IF THE SUPPLY FAILS SELF TEST TURN OFF THE SUPPLY DEPRESS THE 7 KEY AND THEN TURN IT ON WHILE HOLDING THE KEY DOWN 50 AS TO SKIP SELF TEST TROUBLESHOOT THE OEFECTIVE CIRCUIT DAC 15 DEFECTIVE CV 45US07 CC ASUSOS OR READBACK 450510 CHECK ASUSO4 SEE TABLE 3 7 CHECK REF VOLTAGE FOR CV CC DACS AT ASUS05 6 WITH RESPECT YES DOES A5U505 8 10V CHECK ASUSH 0512 CHECK A5US05 Figure 3 7 DAC Circuits Troubleshooting 44 Troubleshooting PERFORM DAC AMPUFIER TROUBLESHOOTING SEE FIG 3 9 E E ETT End MES REESE RT v A masma 0 2 mS DIV A DAC 0508 6 AND CC DAC 510 6 OUTPUTS QV 5V 0 2 mS DIV B READBACK
93. IAS AND REFERENCE VOLTAGES TEST POINTS THROUGH 9 SEE TABLE 6 3 TROUBLESHOOT THE DEFECTIVE CIRCUIT SEE FIGURE 6 5 TURN OFF SUPPLY AND PERFORM 5 CONTROL BOARD TROUBLESHOOTING SET SEE TABLE 3 3 TURN SUPPLY ON AND PROGRAM THE OUTPUT VOLTAGE AND CURRENT TO 1 2 SCALE PROGRAM THE OV TO ZERO INSURE THAT OUTPUT VOLTAGE IS AS PROGRAMMED AND THE OVER VOLTAGE CONDITION IS NOT DETECTEDIOV ANNUNCIATOR IS OFF CHECK VOLTAGES AT A5U630 10 AND A5U630 15 63 WITH RESPECT TO COMMON G SEE TABLE 6 3 A5U630 10 NEGATIVE 50517 14 OV CHECK A5U517 0502 0604 CHECK 5 660 R691 R693 8696 R697 0680 CHECK 50630 A5U630 15 LOW FIG3 3 GAL CHECK 50502 Figure 3 3 OV Will Not Fire Troubleshooting 38 Troubleshooting START AT TURN ON WARNING DURING THESE TESTS THE OUTPUT MAY BE AT HAZARDOUS LEVELS CHECK THAT SUPPLY I NOT PROGRAMMED TO CAUSE AN OV AT TURN ON ENSURE THAT THE VOLTAGE SETTING 5 NOT GREATER THAN THE OV SETTING MEMORY REGISTER BY PROGRAMMING 0 VOLTS AND MAXIMUM OV THEN SAVE IN REGISTER O PRESS THE SHIFT SAVE 0 ENTER KEYS TURN OFF SUPPLY CONNECT A DC SCOPE ACROSS THE SUPPLY S OUTPUT TERMINALS TURN ON SUPPLY AND CHECK THAT OUTPUT DOES NOT MOMENTARILY GO HIGHER THAN THE VOLTAGE SETTINGS MOMENTARILY GOES HIGHER GO TO OUTPUT HELD HIGH TROUBLE SHOOTING FIG 3 6 TURN OFF
94. IATOR ON TURN OFF SUPPLY REMOVE SHUNT FROM OUTPUT TURN ON SUPPLY AND PROGRAM OUTPUT VOLTAGE AND CURRENT TO FULL SCALE PROGRAM OV TO 1 2 FS VOLTAGE CHECK THAT SUPPLY GOES INTO AN OV CONDITION PROT ANNUNCIATOR AND OUTPUT 0 LOW LEVEL AT 2 CHECK A5U502 R502 NO CHECK 5630 GO WILL NOT FIRE TROUBLESHOOTING FIG 3 3 CONDITION OCCURRED Figure 3 1 Overall Troubleshooting Sheet 2 of 4 34 Troubleshooting FROM SHEET 2 PROGRAM OV TO MAXIMUM AND PRESS PROT CLEAR KEY OUTPUT SHOULD GO TO FULL SCALE VOLTAGE PRESS OUTPUT ON OFF REPEATEDLY WHILE WATCHING VOLTAGE DISPLAY DOWNPROGRAMMING SHOULD TAKE LESS THAN 1 SECOND GO SLOW DOWN PROGRAMMING TROUBLESHOOTING GEE FIG 3 12 TURN OFF SUPPLY AND CONNECT A GPIB CONTROLLER TO THE SUPPLY CHECK IF THE SUPPLY ACCEPTS GPIB COMMANDS ACCEPTS COMMANDS CHECK GPIB CABLE 2 15 017 1120 1914 YES ANALOG PROGRAMMABLE SUPPLIES SYSTEM SUPPLIES CHECK OPERATION OF THE DIGITAL CONTROL PORT SERIAL LINK AND THE FRONT PANEL V I ROTARY CONTROLS DIGITAL CONTROL PORT OK CHECK 2 13 118 0114 USE PRIMARY SA TABLE 3 5 TO CHECK A2UfI4 48 CHECK A22U109 1 14 USE PRIMARY SA TABLE 3 5 TO CHECK A2U108 CHECK FRONT PANEL VOLTAGE CURRENT ROTARY CONTROLS FRONT PANEL CONTROLS OK
95. ION OF WARRANTY The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by the Customer Customer supplied software or interfacing unauthorized modification or misuse operation outside of the environmental specifications for the product or improper site preparation and maintenance NO OTHER WARRANTY IS EXPRESSED OR IMPLIED AGILENT TECHNOLOGIES SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE EXCLUSIVE REMEDIES THE REMEDIES PROVIDED HEREIN ARE THE CUSTOMERS SOLE AND EXCLUSIVE REMEDIES AGILENT SHALL NOT BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES WHETHER BASED ON CONTRACT TORT OR ANY OTHER LEGAL THEORY ASSISTANCE The above statements apply only to the standard product warranty Warranty options extended support contracts product maintenance agreements and customer assistance agreements are also available Contact your nearest Agilent Technologies Sales and Service office for further information on Agilent Technologies full line of Support Programs SAFETY CONSIDERATIONS GENERAL This is a Safety Class 1 instrument provided with terminal for connection to protective earth ground OPERATION BEFORE APPLYING POWER verify that the product is set to match the available line voltage the correct line fuse is installed and all safety precautions see following warnings are taken In addition note the i
96. IT INTO 45 502 DISPLAY READS SECONDARY DN TURN OFF SUPPLY ANO REMOVE TOP COVER TURN ON SUPPLY AND CHECK FOR SERIAL DATA PULSES AT 20110 8 TEST POINT 5 WITH RESPECT TO PRIMARY GROUND 1 SEE TABLE 6 31 CHECK A2110 919 CHECK FOR 5V AT A2UTIO 8 WITH RESPECT TO SECONDARY COMMON TEST POINT SEE TABLE 6 3 CHECK CABLE W4 SEE FIG 6 4 CHECK SECONDARY BIAS CIRCUIT TEST POINTS 2 ANO 18 SEE TABLE 6 2 SV A2UTO 8 SUPPLY OPERATES OK7 CHECK FOR SERIAL DATA PULSES AT THE AS CONTROL BOARD YES CIRCUIT POINTS AS INDICATED BELOW WITH RESPECT TO SECONDARY COMMON 12 CHECK A2UTIO AND FOR CABLE W4 OPEN TROUBLE SHOOT A2 ISOLATOR BOARD ANO W4 TO SHEET 2 Figure 3 12 Secondary Interface Down Sheet 1 of 2 50 Troubleshooting FROM SHEET 1 CHECK SPCLA SIGNAL AT A4U806 6 TEST POINT 69 TABLE 6 3 AND FOR CLOCK SIGNAL AT A5US04 18 CHECK 44806 CHECK 5 502 C508 5 CHECK FOR SERIAL DATA PULSES AT THE A2 GPIB BOARD AT A2UITI 6 TEST POINT WITH RESPECT TO PRIMARY GROUND 1 SEE TABLE 6 8 CHECK AZU CABLE W4 CHECK 2 19 Figure 3 12 Secondary Interface Down Sheet 2 of 2 Troubleshooting 51 START SLOW DOWN PROGRAMMING TURN OFF SUPPLY REMOVE TOP COVER AND RFI SHIELD PERFORM AS CONTROL BOARD TROUBLESHOOTING SETUP TURN ON SUPPLY AND PROGRAM OUTPUT VOLTAGE AND CURRENT TO 1 2 FULL SCALE CHECK VOLTAGE LEVELS
97. K SECONDARY BIAS SUPPLIES FAN DETECT U305 LM317T R331 THRESHOLD 2 53V gt 1500 11 PREF R383 FAN SPEED CONTROL NW gt J500 16 RESET NOT LOADED 1505 5821 R328 2 74K R399 1 5 4 44 Rz20 C322 243 4 4 2 1 R330 0 BIAS DETECT CIRCUIT 4 50 NOM J500 13 FAN PWM A 91500 14 FAN DETECT 506 I 0 LM337T NOTES 1 ALL RESISTOR VALUES ARE IN OHMS 1 1 8W UNLESS OTHERWISE SPECIFIED 2 ALL CAPACITOR VALUES ARE IN MICROFARADS UNLESS OTHERWISE SPECIFIED 3 PARTS NOT MOUNTED ON THE BOARD ARE SHOWN WITHIN DOTTED LINES Figure 6 10 A4 AC Input Board Schematic Diagram 002219 90000000020 42 66 65 57 0504 697 R835 692 R694 693 4 552 oo U630 9 RgO92 oO G R710 R696 D615 c8j5 be 855 5404 Eso ROO 07 C623 GlR 10 oo lRe08 o 2512 91 cezo lo of Le 1554 009000000 060000 in 0606 00600000
98. LY S OUTPUT TERMINALS OUTPUT VOLTAGE N RIGHT T T QUE CALIBRATE THE SUPPLY YES NO GO TO SHEET 2 GO TO SHEET 4 Figure 3 1 Overall Troubleshooting Sheet 1 of 4 Troubleshooting 33 FROM SHEET 1 READS RIGHT BUT OUTSIDE SPECS DISPLAY READS WITHIN SPECS VOLTAGE READBACK CIRCUIT A5U503 9504 OR READBACK DAC CIRCUIT 5061 U512 DEFECTIVE YES YES CALIBRATE SUPPLY TURN OFF SUPPLY AND PERFORM A5 CONTROL BOARD TROUBLESHOOTING SETUP TABLE 3 3 TURN ON SUPPLY AND CHECK VOLTAGE AT A5U630 2 43 WITH RESPECT TO COMMON SEE TABLE 6 3 IS CV ANNUNCIATOR ON LOW LEVEL AT TP 2 TURN OFF SUPPLY AND CONNECT A SHUNT SEE TABLE 3 0 ACROSS THE SUPPLY S OUTPUT TERMINALS TURN ON SUPPLY AND PROGRAM FULL SCALE VOLTAGE AND CURRENT CHECK AS5R502 U502 CHECK A50U630 CURRENT RIGHT BUT OUTSIDE SPECS OUTPUT CURRENT WITHIN SPECS CALIBRATE SUPPLY NO V GO TO SHEET 4 CURRENT DISPLAY READS WITHIN SPECS NO READS RIGHT BUT OUTSIDE SPECS CALIBRATE SUPPLY TURN OFF SUPPLY AND PERFORM 5 CONTROL BOARD TROUBLESHOOTING SETUP TABLE 3 3 TURN ON SUPPLY AND CHECK VOLTAGE AT A5U630 3 WITH RESPECT TO COMMON SEE TABLE 6 3 CURRENT READBACK CIRCUIT A5U503 U504 B501 DEFECTIVE iS CC ANNUNC
99. RROR appears on the display during front panel calibration or error code 2 occurs during GPIB calibration and the calibration mode is disabled If you do not know the password you can recover the calibration function by restoring the preset factory calibration constants as described below Restoring Factory Calibration Constants This procedure allows you to recover the factory calibration constants The ability to do this allows you to operate the power supply for troubleshooting and or to recalibrate it as required To restore the original factory calibration constants proceed as follows 1 Turn off the supply and remove the top cover 2 Move the jumper in test header J3 on the Al Front Panel Board from the NORM to the FACTORY PRESET CAL position see Figure 3 15 3 Turn on the power supply and note that ADDR 5 and then PWR ON INIT appear briefly on the front panel display 4 When PWR ON INIT no longer appears the supply s factory calibration constants have been restored and the password has been changed to 0 There is no longer any password protection You can now turn off the supply and restore the calibration jumper to the NORM position see Figure 3 15 5 _ Turn on the supply You may now set a new password if desired and recalibrate the power supply Troubleshooting 63 EEPROM Initialization EEPROM AJIUG on the A1 Front Panel Board stores the supply s GPIB address model number and constants required to program and
100. Remove the two hex standoffs and washers securing the GPIB connector to the rear panel 667xA Only Release GPIB board from holding bracket and remove board from the chassis Men b Output Subchassis The Output Subchassis houses the A5 Control Board A6 Output Board A7 Snubber Board power output transformer choke and output heatsink assembly The output power rectifier D900 and the downprogrammer FETS 60901 902 are mounted on the output heatsink assembly To remove the Output Subchassis proceed as follows Remove Top Cover and RFI Shield as described under their respective procedures Remove the Rear Panel and A2 Board as described in the combined procedure Disconnect the two transformer T900 primary leads from the TB201 terminals fuse clip type on the A3 FET Board Disconnect cables from the following connectors on the A5 Control Board a Phone cable W4 from A5J502 b Ribbon cable W3 from A5J509 c 2 wire cable W7 from A5J503 position the cable away from and clear of output heatsink assembly Remove screw securing output heatsink bracket to the fan assembly Remove the screw located between T900 and L200 securing the bottom of the Output Subchassis to the main chassis Remove three screws securing the side of the Output Subchassis to the side of the main chassis Slide Output Subchassis to rear lift it up and remove it from the main chassis sn 5 Control Board Note The A5 Control Board can be re
101. SEE A3 BOARD SCHEMATIC IN CHAPTER 6 TURN OFF SUPPLY AND PERFORM AS CONTROL BOARD TROUBLE SHOOTING SETUP TABLE 3 3 TURN ON SUPPLY AND PROGRAM THE OUTPUT OF 1 2 FULL SCALE VOLTAGE AND CURRENT PROGRAM OV TO MAXIMUM OCP OFF AND OUTPUT ENABLED I CC ANNUNCIATOR ON NO YES GO TO SHEET 2 1 UNR NO CHECK CV PROGRAMMING LEVEL ANNUNCIATOR AT ASUS08 6 ON YES USE A DIFFERENTIAL INPUT OSCILLOSCOPE TO CHECK FOR THE PRESENCE OF PULSES AT A5J508 ASU600 10 56 ASU602 9 5 607 1 50604 8 AND 50606 7 SEE CORRECT WAVEFORMS IN TABLES 6 3 AND FIGURE 6 1 CHECK VOLTAGE CAUBRATION SEE APPENDIX A IN OPERATING MANUAL 15V 40KHz d YES SEE BOARD TROUBLE is TP 62 SHOOTING TABLE 3 4 NO SV 2MHz IS TP 82 YES 5V 40KHz ph YES NO CHECK 50504 0818 CHECK A5U606 U607 IS 3 NO TV 40KHz YES GO TO SHEET 2 CHECK ASU600 9601 U602 CHECK ASU6IS Figure 3 5 Output Held Low Troubleshooting Sheet 1 of 2 Troubleshooting 41 FROM SHEET 1 o NS YES CHECK VOLTAGE LEVEL 7 ASU608 3 60 NO CHECK VOLTAGE LEVEL AT 50621 1 49 CHECK 50518 0504 CHECK 50608 CHECK 50621 CHECK A5U605 YES CHECK 50605 FROM SHEET 1 CHECK CURRENT READING ON FRONT PANEL DISPLAY DISPLA READS 1 2 5 CURRENT2 NO HECK CC PROGRAM LEVEL AT A5U510 6 40
102. able to Agilent Maintenance Personnel Only REFERENCE PCO 21 6348 amp 21 6397 This PCO is in reference to 21 6348 amp 21 6397 The start serial number for Model Q572A should be as follows MODEL RUN START SERIAL 6572A 57602 3216 00108 CHANGE 12 In Table 5 6 CHANGE 1 Capacitor C138 from 0 047 20 50V Agilent P N 0160 5422 to 0 01 10 100V Agilent P N 0160 4832 Qty 1 2 Resistor R134 from 100 Ohm 596 1 AW Agilent P N 0683 1015 to 1K 596 1 AW Agilent P N 0683 1025 Qty 1 CHANGE 13 In Table 5 6 The power supply unit will not operate with Agilent relay boxes 59510A and 59511A in the relay link communications mode The cover must be removed and the jumper on the GPIB assembly 50603291 must be moved as described in the operating manual to observe this operating anomaly CHANGE 14 In Table 5 9 ADD Label Agilent P N 5080 2249 Qty 1 Change to ETL label CHANGE 15 In Table 5 9 ADD Capacitor C900 100pF 5 100V Agilent P N 0160 4801 Qty 1 CHANGE 16 In Table 5 3 CHANGE 1 PC Board Output Snubber from Agilent PN 5020 2745 to Agilent P N 5020 2774 Qty 1 2 Output from Agilent P N 5020 2744 to Agilent P N 5020 2775 Qty 1 Backdating 151 CHANGE 17 In Table 5 11 CHANGE Capacitor C990 C991 from 0 022uUF 10 200V Polyester Foil Agilent P N 0160 0162 to 0 022uF 5 400V Polypropylene Foil Agilent P N 0160 5927 Qty 2 CHANGE 18 In Table 5 9 CHANGE Insulator REF Y501 from 433
103. acteristics listed in Table 1 1 of the Power Supply Operating Manual If you encounter failures or out of specification test results see Troubleshooting Procedures Chapter 3 The procedures will determine if repair and or calibration is required Note The power supply must pass the selftest at power on before the following tests can be performed If the power supply fails selftest go to Chapter 3 Test Equipment Required List of Equipment Table 2 1 lists the equipment required to perform the tests given in this chapter Only the equipment marked with the nl superscript is needed for the Operation Verification test Current Monitoring Resistor The four terminal current monitoring resistor listed in Table 2 1 is required to eliminate output current measurement error caused by voltage drops in leads and connections The specified load resistors have special current monitoring terminals inside the load connection terminals Connect the AC or DC voltmeter directly to these current monitoring terminals Verification 11 Table 2 1 Test Equipment Required Required Characteristics Recommended Model Resolution 10 nV 1V Readout 8 1 2 digits Digital Voltmeter Agilent 3458A Accuracy 20 ppm Agilent 6571A 6671A 0 001Q 0 04 300A 100W Current Monitor Resistor Agilent 6572A 6575A 6672A 6675A 0 010 0 04 100A 100W Guildline 9230 300 Guildline 9230 100 DC Power Supply 5V 10A Agilent 6
104. and Rail Q202 Q222 FETS causing current to flow through T900 in the opposite direction The FET on off periods are controlled by Duty Cycle Detect and the peak current detection circuits If the output attempts to change regulation is accomplished by the CV CC Control Circuits on the A5 Control Board previously described These circuits vary the width of the drive pulses and the duration of the FET on off periods Output Circuits The output circuits consist of chassis mounted components power transformer T900 power rectifier D900 and inductor L900 the A6 Output Filter Board and the A7 Snubber Circuit Board These circuits are shown on the corresponding model schematic see Chapter 6 Power transformer T900 couples the output pulses from the A3 FET Board to the power full wave rectifier D900 Filtering is provided by L900 and the A7 Snubber Board The A6 Output Board provides both normal mode and common mode filtering as well as downprogramming circuits When activated the downprogramming circuits draw current from the output terminals 82 Principles Of Operation 35 35 15 WOUINOD 490 NISI FINO F 133H9 7IOUINOO 133HS SMUD TOULNOD 9 H31dVH2 NI 2I1YW3H2S Fev ddv 335 w O 133889 32V 3 AUvQNO23S GUVOB SV 0060 ASSY SH ONY GtiVO8 133 38 SLINDYID HOSS 3D0HdOHIIN AYYNIHd YOLY1OSI 3 91899 GHYOS 8450 viva
105. anges 26 through 34 and change 36 Note Serial Numbers _ Change Model 6571A 3206A 00103 8 9 3222A 00118 7 3222A 00123 14 All 17 19 22 37 3635A 00143 _ 39 40 Model 6572A 3203A 00103 8 3203A 00108 7 9 10 11 3216A 00123 14 3422A 00138 37 3626A 00218 39 3635 00223 40 Model 6573 3204A 00103 8 9 3223 00113 7 3223 00133 14 3432A 00143 37 3620A 00208 38 3633A 00220 _ 39 40 Model 6574A 3208A 00103 6 8 9 3230 00113 7 14 22 3423 00183 37 3423 00258 38 3620 00303 39 3634 00323 40 Serial Numbers _ Change Model 6575A 3209A 00103 8 9 3220A 00108 6 3242A 00118 14 3423A 00163 37 3423A 00208 38 3622A 00238 39 3634A 00268 40 Model 6671A 3125A 00168 1 3129A 00183 13 3145A 00233 2 3 4 3203A 00273 9 3215A 00323 7 3236A 00388 12 3236A 00428 14 35 All 17 19 20 21 22 23 24 25 36 3624A 00578 39 3639A 00601 _40 Model 6672A 3138A 00101 13 3149A 00120 9 3217A 00131 7 10 3235A 00151 12 3235A 00201 14 3347A 00256 35 All 19 22 36 3621 00561 39 3632 00603 _40 Backdating 147 Serial Numbers Change Model 6673A Serial Numbers _ Change Model 6674A cont 3138A 00101 13 3151A 00116 9 3346A 00391 35 3216A 00141 7 All 15 16 19 20 21 3239A 00176 12 22 23 24 25 36 3239 00226 14 3501 00941 38 3345A 00356 35 3619A 01161 39 All 19 22 36 3632A 01
106. apacitor 0 22 10 C226 0160 4791 Capacitor 10pF 5 100V C227 0160 4835 Capacitor 0 1uF 10 50V C228 0160 4904 Capacitor 6800pF 5 C229 0160 4832 Capacitor 01uF 10 C230 0160 4831 Capacitor 4700pF 10 235 238 0160 4832 Capacitor 01uF 10 C239 0160 4791 Capacitor 10 5 100V C240 0160 4832 Capacitor 01uF 10 C242 243 0160 5098 Capacitor 0 22 10 C244 245 0160 6806 Capacitor 0 1uF 400V D201 1901 0050 Diode switching D202 1901 1065 Diode power IN4936 D203 204 1901 0050 Diode switching D205 1901 1065 Diode power IN4936 D206 210 213 217 220 223 1901 0050 Diode switching D224 1901 0731 Diode power rectifier J200 1252 0055 Connector L201 204 9170 1454 Inductor choke L205 212 9170 1510 Inductor choke L213 216 9170 1454 Inductor choke Q201 204 211 222 233 244 5080 2241 Transistor MOSFET matched set of 8 Q251 254 1853 0363 Transistor PNP D45H5 D45H8 363 R207 232 0683 0335 Resistor 3 3 Q 5 0 25W R201 0699 3196 Resistor 150 Q 5 2W R202 0699 0208 Resistor 1 5 0 25W CF R203 0683 8215 Resistor 820 Q 5 0 25W R204 0698 0083 Resistor 1 96K 1 R205 0683 1005 Resistor 10 Q 5 0 25W R206 0683 7505 Resistor 75 Q 5 0 25W R208 0683 3305 Resistor 33 5 0 25W R209 0683 1005 Resistor 10 Q 5 0 25W R210 0683 1015 Resistor 100 Q 5 0 25W Replaceable Parts 95 Table 5 7 A3 FET Board Replaceable Parts continued Ref Desig
107. arts continued Ref Desig Agilent Part No Description ELECTRICAL PARTS R638 0699 0070 Resistor 3 16M 1 R639 0757 0407 Resistor 200 Q 1 0 125W R640 0757 0442 Resistor 10K 1 0 125W R641 0699 0070 Resistor 3 16 M 1 R642 643 0757 0472 Resistor 200K 1 R644 0757 0280 Resistor 1K 1 0 125W R645 0757 0442 Resistor 10K 1 0 125W R650 0757 0453 Resistor 30 1K 1 R651 652 Model specific 6571A 6671A 0757 0453 Resistor 30 1K 1 6572A 6672A 0757 0462 Resistor 75K 1 0 125W 6573A 6673A 0757 0468 Resistor 130K 1 6574A 6674A 0757 0473 Resistor 221K 1 6575A 6675A 0698 3260 Resistor 464K 1 R653 0757 0453 Resistor 30 1K 1 R662 663 0757 0410 Resistor 301 1 0 125W R664 0698 3155 Resistor 4 64K 1 R665 666 Model specific 6571A 6671A Not used 6572A 6672A 0757 0199 Resistor 21 5K 1 6573A 6673A 0757 0441 Resistor 8 25K 1 6574A 6674A 0757 0447 Resistor 16 2K 1 6575A 6675A 0698 3157 Resistor 19 6K 1 R667 0698 3279 Resistor 4 99K 1 R669 0698 0082 Resistor 464 Q 1 0 125W R670 0757 0199 Resistor 21 5K 1 R671 0698 3279 Resistor 4 99K 1 R672 0757 0472 Resistor 200K 1 R674 0757 0465 Resistor 100K 1 R678 Model specific 6571A 6671A 0698 3450 Resistor 42 2K 1 6572A 6672A 0757 0457 Resistor 47 5K 1 6573A 6673A 0698 3450 Resistor 42 2K 1 6574A 6674A 6575 6675A 0698 3162 Resistor 46 4K 1 R679 Model specific 6571A 6574A 0698 3155 Resistor 4 64K 1 6671A 6674A 6575 6675A 0757 04
108. ation Of i e Ue emo E DR PR BO n E 75 replacing zoo SPIRI Se ede ES 76 overvoltage maximum programmable nesie riii EEE E E entente 17 P Performance test tecord foem 2 tenet tr re RR EUER DURER EEG ERO IDEE EUR 27 performance tests CC ecu ette Pp tdt eet ete etd erede 23 performance tests C V tetur pei t e eU castes OS elit svete pte i ed PE 20 power FETs replacing nere R GE due unt Sun e DS 121 122 86 V M M 34 power on Selftest disablmg n oed en UU ten 34 protectiv e earflyeroupd u usss 13 R tecord 5 SRI NER GRIS RN y 17 referenc e supply cr te 37 iE ME E 18 removing AT Front Panel Assembly D DR pO er E OC ER Cer repe a ee 74 AT Front TRO 74 AZ GPIB Boarder ee ga pte ipte 75 eerie oes 77 AF AC Input 2 8 E HUBER EI ei 78 AS Control Board 76 AG output 76 AT Snubber Board
109. ause a shock or fire hazard Do not operate this instrument in the presence of flammable gases or fumes Do not install substitute parts or perform any unauthorized modification to this instrument Some procedures described in this manual are performed with power supplied to the instrument while its protective covers are removed If contacted the energy available at many points may result in personal injury Any adjustment maintenance and repair of this instrument while it is opened and under voltage should be avoided as much as possible When this is unavoidable such adjustment maintenance and repair should be carried out only by a skilled person who is aware of the hazard involved Capacitors inside this instrument may hold a hazardous electrical charge even if the instrument has been disconnected from its power source SAFETY SYMBOLS Instruction manual symbol The instrument will be marked with this symbol when it is necessary for you to refer to the instruction manual in order to protect against damage to the instrument This sign indicates hazardous voltages This sign indicates an earth terminal sometimes used in the manual to indicate circuit common connected to a ground or mle chassis 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 condit
110. board Then follow the instructions above for EEPROM INITIALIZATION and also TRANSFERRING CALIBRATION CONSTANTS TO THE FACTORY PRESET LOCATIONS described above After the supply has been Initialized Calibrated and the new Factory Presets stored remove the GPIB board and reinstall the original Isolator board Program to initialize EPROM or move factory preset data in 657xA and 667xA power supplies RE STORE INIT_2KW Rev A 00 00 dated June 28 1993 DIM Init_data 1 45 Model 5 Idn 21 Cal_data 40 INTEGER Addr 1 45 Length 1 45 ASSIGN Ps TO 705 Supply must be at address 705 CLEAR SCREEN 110 Eprom_data_addr Data address 120 DATA 2 6 10 14 18 19 20 24 28 32 130 DATA 36 37 38 42 46 50 54 55 56 57 140 DATA 64 68 72 76 80 150 152 153 154 155 Figure 3 18 Initialization and Factory Preset Replacement Program Listing Sheet 1 of 6 64 Troubleshooting 150 DATA 156 158 160 162 163 164 165 166 167 168 160 DATA 169 170 171 172 174 170 180 Eprom_data_len DATA 4 4 4 4 1 1 4 4 4 4 DATA 1 1 4 4 4 4 1 1 1 1 DATA 4 4 4 4 4 2 1 1 1 1 DATA 2 2 2 1 1 1 1 1 1 1 DATA 1 1 1 2 1 250 Eprom_data_6x71 DATA 459 70 8 19 0 83 0 14 561 39 45 225 23 0 DATA 98 3 88 65 0 10 0 83 255 20 10 DATA 6571 455 168 13 7 163 1768 5 255 0 0 DATA 1296 6571 0 20 180 20 180 175 33 98 DATA 115 30 20 1 58 320 Eprom_data_6x72 DATA 181 75 038 20 475 0 99 0 31 88 988 102 375 0 DATA 82 1 35 416 18 24 0 99 255 20 10 DATA 6572
111. c probe DR Oe rn D Dated 34 B bias supply II IR DANI RR DUE D SUBIRE EE 36 cable W233 ELD DOM osc Emm 75 WA phone R tO a ith 75 WS 75 MO aC DIaS o c p Re de i 74 p uiay 131 calibration constants factory n Na 67 calibration Password esis 67 calibration post repatt e mee tm ER EHE RERUM 67 calibration e te eee eet VADER ER So su 11 CC annunclator tia Recetas ipu n eee q RI RS 57 CC load ff ctifesIpDg eee peer teat pet qt ertt Dire e e EE ed 24 CC noise PARDJ testina etre e nete e ebd E ede 24 CCIPARD definie d istint ee seeded oink E 24 Circuits oap Der ar ERE dee ret 82 conductive table mat sic cs 9 ente me nU Iren D brin d eive cron getan URNA tan i RU 13 conductive Wrist Strap deae eterne e etd nope ted pe eid e te eese feci de oen 13 configuration jumper FACTORY PRESET CAL b eene ORG e DGIO e Dip e DOR e e 61 FIST UNLIL er e E d ert e de t eds 61 INHIBIT CAL on UD RS WU Dee Emden ee E EE 61 RELAY LIN anne bee eee ee 61 SA ModE gc DE n It I 61 current maximum programmable co Ee ee
112. ckwasher J101 0515 0642 Screw 0121 0515 0911 Screw M3x0 5 101 1200 0567 Socket IC 28 pin U106 1200 0639 Socket 20 U119 120 1200 1274 Socket IC U114 Backdating 157 000000000000 990000009000 oooooocooQgooooooooobpo 0000090006009000 000000000 0000 rt ooo 955 i Z oyos Uiisp Too Moo06000000606000060000 4196 0090000000000000 010900 90000090 6 ciego o0000000000 000000000 00000000000 9000000 005506005 E Li Figure A 1 A2 GPIB Component Parts List 158 Backdating Index A A1 Front Panel Board test head r l ni a RE aS edcessevesceacessecedea ERR eeu 61 GPIB Board test header Serene OD 61 A3 FET Board dynamic troubleshooting nea Gt ote tenete iter b ubus uhaspa i tisa 58 static troubleshooting 5 ebbe der eee ertet eee t ter tds 57 test connections ne p ORT reine o ODORE e DRE 57 57 58 AM Al OB POLE sh cock e E ERREUR 1 04 es eth eee A A e e A 34 Agilent 545A logi
113. comes on 20 Verification Table 2 5 Constant Current CC Tests continued Action CC Load Effect cont Observe the DVM reading Divide this by the resistance of the current monitoring resistor to obtain the output current Record the result Short the Electronic Load input and repeat Step 4 Check the result Normal Result You may want to use an averaged reading for this measurement You may want to use averaged reading for this measurement The difference between the current readings taken in Step 4 and Step 5 must be within specified Load Effect limits 1 CC Source Effect Turn off the power supply and connect the ac power input through a variable voltage transformer Set the transformer to the nominal ac line voltage Connect the DVM across the current monitoring resistor see Figure 2 1 Turn on the power supply and program the current to its full scale value and the voltage to its maximum programmable value see Table 2 2 Set the Electronic Load to CV mode and its voltage to full scale Adjust the transformer to decrease the ac input voltage to the low line condition 174Vac or 191 Vac Observe the DVM reading Divide this voltage by the resistance of the current monitoring resistor to obtain the output current Record the result Adjust the transformer to increase the ac input voltage to the high line condition 220Vac or 250Vac Observe the DVM reading Divide this
114. d by the time delay action of one of the turn on relays AK400 During the turn on period approximately 10 seconds relay A4K400 is deenergized and presents a higher input resistance that limits inrush current After the turn on period relay A4K400 energizes and decreases R400 R401 input resistance Bias Supplies and Bias Detect The secondary windings of the bias transformer A4T300 provide ac inputs to the 15Vp primary bias supply components D313 D316 U302 the 15V secondary bias supply components D306 D309 U305 U306 and the fan voltage supply components D310 D317 In addition the bias transformer applies ac power to the 5V Primary Interface Bias Supply on the A2 GPIB or Isolator Board The 15Vp bias voltage is used to operate the turn on relays K400 K401 an Isolation Optoisolator U309 and by circuits on the A3 FET Board The 15V bias voltage is used by the fan speed control circuits and also powers the 5V and 14V bias voltages used by circuits on the A5 Control Board The purpose of the Bias Detect Circuit U308 is to disable the power supply output until the bias voltages have stabilized When power is initially applied the circuit generates a RESET signal to disable the supply s output and to initialize the secondary interface microprocessor on the A5 Control Board When the bias circuit has stabilized the Bias Detect Circuit detects a BIAS_OK signal from the A5 Control Board and removes the RESET signal to enab
115. down from Figure 3 1 Figure 3 13 Slow downprogramming circuit from Figure 3 1 Troubleshooting Test Points The troubleshooting charts reference test points listed in Table 6 3 of Chapter 6 Test points are identified by an encircled number such as in schematic diagrams and component location drawings also in Chapter 6 Bias and Reference Supplies Many of the following troubleshooting procedures begin by checking the bias and or reference voltages Table 6 3 lists the test points for these voltages and gives the correct reading for each The circuit board component location diagrams identify these points on each board 32 Troubleshooting START OVERALL TROUBLE SHOOTING TURN OFF SUPPLY AND REMOVE THE TOP COVER AND RFI SHIELD DISCONNECT AND CONNECT SENSE TERMINALS FOR LOCAL SENSING TURN ON SUPPLY AND CHECK FOR ANY INDICATION RUNNING DISPLAY ON INPUT RAIL LED A4CR402 THAT AC POWER 15 IS AC POWER CHECK FUSE A4F400 INPUT LINE FILTER FL1 OR LINE ON SWITCH 151 YES CHECK FUSE A4308 XFMR 4 300 LINE VOLTAGE SELECT SWITCH SW 300 ANO DIODES 0306 310 D317 GO TO NO DISPLAY TROUBLE SHOOTING SEE FIG 3 2 CHECK FAN 4964 R369 R370 ERROR MESSAGE SE LF TEST ERROR MESSAGES TABI lt DISPLAYED E SE ESTE CODES MES LE 3 2 NO USING FRONT PANEL KEYS PROGRAM FULL SCALE VOLTAGE AND CURRENT SEE TABLE 2 2 AND USE OVM TO MEASURE VOLTAGE AT SUPP
116. e Parts 101 Table 5 9 A5 Control Board Replaceable Parts continued Ref Desig C660 C670 Model specific 6571A 6574A 0160 5098 6671A 6674A 6575A 6675A 0160 4835 C671 0160 5469 C672 0160 4795 C680 Model specific 6571A 6671A 0160 4822 6572A 6672A 0160 4829 6573A 6673A 0160 4808 6574A 6674 6575 6675A 0160 4813 C681 Model specific 6571A 6671A 0160 4832 6572A 6672A 6573A 6673A 0160 4904 6574A 6674A 0160 4831 6575 6675A 0160 5410 C682 0160 4799 C683 Model specific 6571A 6671A 0160 5468 6572A 6672A 0160 5469 6573A 6673A 0160 7277 6574A 6674A 6575A 6675A 0160 7308 C684 Model specific 6571A 6671A 0160 5469 6572A 6672A 0160 7277 6573A 6575A 0160 7308 6673A 6675A C690 Model specific 6571A 6671A 0160 4795 6572A 6672A 6573A 6673A 0160 4799 6574A 6674A 6575A 6675A 0160 4795 C691 692 Model specific 6571A 6671A 0160 5469 6572A 6672A 0160 5892 6573A 6673A 0160 5579 6574A 6674A 0160 5578 6575A 6675A C695 696 0160 4791 C700 0160 4822 C701 0160 4834 102 Replaceable Parts Agilent Part No Description ELECTRICAL PARTS 0160 4822 Capacitor 1000pF 5 Capacitor 0 22uF 10 Capacitor 0 1 10 50V Capacitor 1uF 10 50V Capacitor 4 7pF Capacitor 1000pF 5 Capacitor 680pF 10 Capacitor 470pF 5 Capacitor 180pF 5 Capacitor 0 01uF 10 Capacitor 6800pF 5 Capacitor 470
117. e following steps show how to set up the voltmeter from its front panel to take a statistical average of 100 readings represents the unlabeled shift key in the FUNCTION RANGE group 1 Program 10 power line cycles per sample by pressing 9 Enter 2 Program 100 samples per trigger by pressing 1 6 9 Enter 3 Setup voltmeter to take measurements in the statistical mode as follows a Pres O O b Press 4 until MATH function is selected then press gt c Press until STAT function is selected then press Enter 4 Now set up voltmeter to read the average of the measurements as follows a Press CO CO b Press v until RMATH function is selected then press Enter c Press amp until MEAN function is selected then press Enter 5 Execute the average reading program by pressing Enter 6 Wait for 100 readings and then read the average measurement by pressing Enter Record this as your result 22 Verification Table 2 6 Performance Test Record Form Test Facility Model Serial No Options Firmware Revision Special Notes Report No Date Customer Tested By Ambient Temperature C Relative Humidity Nominal Line Frequency Hz Test Equipment Used Description 1 AC Source Model No 2 DC Voltmeter Trace No Cal Due Date 3 RMS Voltmeter 4 Osci
118. e of the supply If the output voltage exceeds the programmed voltage the GATE signal goes low causing the output voltage to decrease to the programmed value Conversely if the output voltage is less than the programmed voltage GATE goes high to cause the output voltage to increase to the programmed value An externally applied dc signal VPROG can also be used to program the output voltage A 0 to 5V VPROG level produces a proportional Zero to full scale output voltage In CC mode an OR gate diode D615 conducts and the CC loop regulates the output current A CC Error Amplifier P O U612 compares the programmed current signal CCPROG 0 to 10V range to IMON which is the output current monitor signal This signal is produced by measuring the voltage across a current monitor resistor A6R907 on the A6 Output Filter Board The voltage drop across A6R907 ISEN is amplified by 1st I AMP 0617 and 2nd 0612 to produce current monitoring signal IMON The range of IMON is 0 to 10V which corresponds to the zero to full scale output current of the supply If the output current exceeds the programmed current the OR GATE gate signal goes low causing the output current to decrease to the programmed value Conversely if the output current is less than the programmed value the GATE signal goes high causing the output current to increase to the programmed value An externally applied differential voltage signal IP can a
119. each power supply Manual Revisions This manual was written for power supplies that have the same serial prefixes first part as those listed on the title page and whose serial numbers second part are equal to or higher than those listed in the title page Note 1 If the serial prefix of your supply is higher than that shown in the title page then the supply was made after the publication of this manual and may have hardware and or firmware differences not covered in the manual 2 Ifthey are significant to the operation and or servicing of the power supply those differences are documented in one or more Manual Changes sheets included with this manual 3 Ifthe serial prefix on the power supply is lower than that shown on the title page then the supply was made before the publication of this manual and can be different from that described here Such differences are covered in Appendix A Manual Backdating Changes Firmware Revisions The power supply s firmware resides in the main board microprocessor chip and in ROM chips on the A2 GPIB and A1 Front Panel boards You can obtain the firmware revision number as follows bench power supply you will find the revision numbers printed on the label affixed to the integrated circuit Fora GPIB system power supply you can read the integrated circuit label as above or query the power supply using the GPIB IDN query command see Chapter 3 Troubleshooting Also see Chapt
120. ead only memory U6 on the A1 Front Panel Board stores data and configuration information This information includes calibration constants GPIB address 667xA Series only the present programming language and model dependent data such as the minimum and maximum values of voltage and current One of the EEPROM storage locations holds a checksum value used to verify the integrity of this EEPROM data Access to the 78 Principles Of Operation calibration data in the EEPROM is controlled by the combination of a password and jumper options on a header J3 located on the Al board see Post Repair Calibration in Chapter 3 The power supply can be calibrated with front panel keys or over the GPIB 667xA Series with SCPI Standard Commands for Programmable Instruments commands The calibration procedure is in Appendix A of the Power Supply Operating Manual A5 Control Board The 5 Control Board contains the Secondary Interface the CV CC constant voltage constant current Control Circuits and the Switching Downprogramming Control circuits These circuits are shown schematically on Sheets through 3 of the 5 Control Board schematic Secondary Interface These circuits are shown in detail in the A5 Control Board schematic Sheet 1 and include the Secondary Microprocessor IC U504 the Programmed GAL IC U502 three DAC OP amp digital to analog converter operational amplifier circuits 0507 0512 and Readback Comparator circuits 0503
121. eadback Vout 90mV mV Vout 90mV 2 2uV High Voltage 60V Vou 59 916V V 60 084V 0 8mV Front Panel Display Readback Vout 120mV mV Vout 120mV 0 8mV Load Effect Vou 3 2mV mV Vout 32mV 40 Source Effect Vou 3 2mV mV Vou 3 2mV 40 PARD Ripple and Noise Peak to Peak 0 mV 11mV 904uV RMS 0 mV 1 3mV 150uV Transient Response Time 0 mV 100mV 12mV at 900 us Constant Current Tests Current Programming and Readback Low Current OA Ij 25mA mA 25mA 153uA Front Panel Display Readback Tout 35mA mA Tout 35mA 153 High Current 35A Tou 34 94A A 35 06 5 7mA Front Panel Display Readback Tout 70mA mA Tout 70mA 5 7mA Current Sink 4A Display Readback Link 39mA mA Link 439mA 0 6mA PARD Ripple and Noise 0 mA 25mA 5mA RMS Load Effect Lu 3 75mA mA 1 43 75 21 Source Effect Lu 3 75mA mA 1 43 75 21 Enter your test results in this column Verification 27 Table 2 11 Performance Test Record for Agilent Model 6575A or 6675A MODEL Agilent Report No Date Test Description Minimum Results Maximum Measurement Spec 5 Spec Uncertainty Constant T Tests Voltage Programming and Readback Low Voltage OV Vout 120mV mV 120mV Front Panel Display Readback Vout 180mV mV Vout 180mV High Voltage 120V Vou 119 832V V 120 168V 1 7mV Front Panel Display Readback Vout 240mV mV Vou 240mV 1 7mV Load Effect Vo
122. easurement Techniques Figure 2 1 shows the setup for most tests Measure the dc output voltage directly at the sense S and S terminals Connect these terminals for remote sensing to the LS and LS terminals Be certain to use load leads of sufficient wire gauge to carry the output current see Chapter 4 of the Power Supply Operating Manual To avoid noise pickup use coaxial cable or shielded pairs for the test leads If you use more than one meter or a meter and an oscilloscope connect separate leads for each instrument to avoid mutual coupling effects Performance Test Record Sheets When performing the tests in this chapter refer to the Performance Test Record sheets supplied at the end of this chapter Table 2 6 is for recording common information such as the test equipment used and the environmental conditions Tables 2 7 through 2 11 are dedicated to specific models and contain the acceptable test values and ranges A place is provided to record the results of the test Verification 13 OC POWER SUPPLY O NOTE 2 ELECTRONIC LOAD TO RMS VOLTMETER OR OSCILLOSCOPE TO DC OR RMS CURRENT MONITOR VOLTMETER RESISTOR NOTE 1 OR OSCILLOSCOPE TO RMS VOLTMETER NOTES 1 SEE TABLE 2 1 2 REQUIRED FOR CURRENT SINK TEST FIG2 01 GAL A CV Test Setup CC Test Setup Figure 2 1 Constant Voltage CV Test Setup Note It is recommended that before you perform the tests in either Table 2 4 or Table 2 5 t
123. ect signature analyzer CLOCK START STOP and GROUND inputs as show in Figure 3 16 4 Turn on the power supply and use the signature analyzer probe to take the following signatures Power SV 9FFP Serial Link 20109 3 0104 Microprocessor A2U 114 24 9FFP A2U 114 25 UF39 Digital Control Interface A2U118 1 9AF1 A2U118 9 40A5 A2U 118 10 1029 A2U118 15 0010 A2U118 16 040A Gated Array Logic A2U119 2 0455 A2U119 5 0040 A2U119 15 0040 5 After completing the tests be sure to return the J106 jumper to its original position read Edge A2 Board A1A1 Front Panel A10 Board Input Setting Connection Board Connection Connection clock LA 2065 J2 9 U504 32 START gt J106 6 J2 11 U502 7 STOP J106 6 42 11 U502 7 GROUND J106 4 J2 8 U502 10 Figure 3 16 Signature Analysis Signal Inputs 58 Troubleshooting U3 PIN OUTS TOP VIEW LOOKING DOWN ON COMPONENT SIDE OF PC BORRD 1 Front Panel 0504 1 US 4 32 1 504 15 SA MODE CLOCK START STOP 564 28 GROUND B 900000007 00000900 C A5 Control Board Figure 3 17 Signature Analysis Connections for Model 657xA Only Troubleshooting 59 114 PIN OUTS jo o 5087 i 25 HET 9 Qi R imi 0 v s ick E f 39 2 6 33 ER 3 9 9 9 99 if tad GROUND START STOP
124. elf threading display to front panel 0535 0002 Nut hex shunt to PCB 0535 0031 Nut hex w lockwasher bus bar to output bd 0590 0305 Nut hex w lockwasher L901 902 brkt 0535 0031 Nut hex w lockwasher M3X 5 2 4 mm fan to bracket 0590 0305 Nut hex w lockwasher 6 32 thrd 094 in thk ground wire to rear panel 2550 0084 Nut hex bus bar 2950 0144 Nut hex rear panel gnd post B 0905 0193 O ring 1 12in input caps 5001 6746 output chassis sense term 5080 2184 Rear label 5001 6743 Rear panel 5040 1674 Safety cover dc output 5040 1676 Safety cover ac input Replaceable Parts 89 Table 5 3 Main Chassis Replaceable Parts continued Ref Desig Agilent Part No Description MECHANICAL PARTS continued 2680 0215 2940 0103 0515 1253 2940 0103 2940 0103 2680 0222 0515 0104 0515 0374 0515 0433 0380 1524 3050 0893 2190 0586 0535 0024 5001 6775 0515 0375 0515 0382 0515 0433 0515 0906 0515 1132 0515 0375 0515 0433 5001 6763 5001 0539 0380 0643 0380 1524 7144 0535 0380 1524 5062 3705 0362 0681 0362 0207 1205 0777 3050 0629 3050 1690 3050 0002 3050 0629 3050 0858 3050 0893 3050 0993 3050 1677 Screw mch 10 32 output caps Screw cap 1 4 20 power xfmr to diode block bus to heat sink Screw cap M8x1 25 30 mm lg shunt to PCB Screw cap 1 4 20 diode block to heat sin
125. emote inhibit RI input Install jumper here for SA mode Install jumper here to configure DIG CNTL port for digital I O operation Install jumper here to configure DIG CNTL port for control of external relay accessories See Appendix D in Power Supply Operating Manual for information about the digital control port 7 and 8 NORM 3 and 4 INHIBIT CAL 1 and 2 SA Mode 5 and 6 FACTORY PRESET CAL Front Panel Test Connector A1J3 Normal operating and storage position of jumper Install jumper here for SA mode Install jumper here to disable calibration commands and prohibit calibration Install jumper here to restore original factory calibration constants TEST HEADER ON A2 GPIB BOARD TEST HEADER ON 667xA A1 FRONT PANEL BOARD J106 J3 SA MODE 1 G O 2 SA MODE gt 1 0 012 DIG VO 3 10 O14 INHIBIT CAL s 3 0 14 RELAY gt 5 O FACTORY PRESET CAL 5 O__O 6 x gt 7 8 NORM 7 8 POSITION OF JUMPER AS SHIPPED FROM THE FACTORY Figure 3 15 Test Header Jumper Positions Troubleshooting 57 Table 3 5 Primary Interface SA Test Description These signatures check some primary interface circuits on the Systems Supply A2 GPIB Board Valid A2U106 ROM Firmware Revision A 01 06 Test Setup See Figure 3 17 1 Turn off the power supply and remove the top cover 2 Connect SA jumper of connector J106 on A2 GPIB Board see Figure 3 15 3 Conn
126. ependent and may be performed in any order Verification 15 1 Table 2 4 Constant Voltage CV Tests Action Normal Result Voltage Programming and Readback Accuracy This test verifies that the voltage programming GPIB readback GPIB system power supplies only and front panel display functions are within specifications With system power supplies values read back over the GPIB should be the same as those displayed on the front panel Turn off the power supply and connect a DVM across LS and LS see Figure 2 1 Turn on the power supply with no load and program the output for 0 volts and maximum programmable current see Table 2 2 Record voltage readings at DVM and on front panel display Program voltage to full scale see Table 2 2 Record voltage readings of DVM and on front panel display CV Load Effect CV annunciator on Output current near 0 Readings within specified Low Voltage limits Readings within specified High Voltage limits This test measures the change in output voltage resulting from a change in output current from full load to no load 1 Turn off the power supply and connect a DVM across LS and LS see Figure 2 1A Turn on the power supply and program the current to its maximum programmable value and the voltage to its full scale value see Table 2 2 Adjust the load to produce full scale current see Table 2 2 as shown on the front panel display Record
127. er 3 Firmware Revisions for the actual Agilent BASIC program that does this Safety Considerations This power supply is a Safety Class I instrument which means it has a protective earth terminal This terminal must be connected to earth ground through a power source equipped with a 3 wire ground receptacle Refer to the Safety Summary page at the beginning of this manual for general safety information Before operation or repair check the power supply and review this manual for safety warnings and instructions Safety warnings for specific procedures are located at appropriate places in the manual 8 Introduction Hazardous voltage exist within the power supply chassis at the output terminals and at the analog programming terminals Conventions In diagrams the name of a complementary signal is sometimes shown with a bar above the signal mnemonic In other diagrams and in the text complementary signals are shown with an asterisk after the mnemonic such as PCLR A mnemonic with a bar over it or an asterisk after it represents the same signal In this manual all Agilent 667xA Series supplies are referred to as system supplies All Agilent 657xA Series supplies are referred to as bench supplies Electrostatic Discharge The power supply has components that can be damaged by ESD electrostatic discharge Failure to CAUTION EM h 4 observe standard antistatic practices can result in serious degradation of performance e
128. error Error handling subroutine 2250 OUTPUT Ps SYST ERR Check for errors 2260 ENTER Ps Err 2270 RETURN 2280 2292 END Figure 3 18 Initialization and Factory Preset Replacement Program Listing Sheet 6 of 6 Disassembly Procedures Shock Hazard To avoid the possibility of personal injury remove the power supply from service before removing the top cover Turn off the ac power and disconnect the line cord GPIB cable load leads and remote sense leads before attempting any disassembly Cable connections are shown in Figure 6 2 of Chapter 6 and component part numbers are given in Chapter 5 Reassembly procedures are essentially the reverse of the corresponding disassembly procedures Most of the attaching hardware is metric Use of other types of fasteners will damage threaded inserts CAUTION Older power supplies use TORX screws for securing the carrying straps When removing or installing these screws use TORX screwdriver size T 15 unless T 10 is specified Top Cover 1 Remove the four screws that secure both the carrying straps and the cover to the chassis 2 Spread the bottom rear of the cover and then pull back to disengage it from the front panel 3 Remove the cover by sliding it back towards the rear of the power supply Shock Hazard Hazardous voltage can remain inside the power supply even after it has been turned off Check the INPUT RAIL LED A4CR402 under the RFI shield see Fi
129. est Record for Agilent Model 6572A or 6672A MODEL Agilent Report No Date Test Description Minimum Results Maximum Measurement Spec 5 Spec Uncertainty Constant T Tests Voltage Programming and Readback Low Voltage OV Vout 20mV mV 20mV Front Panel Display Readback Vout 30mV mV V qut 30mV High Voltage 20V Vout 19 972V V 20 028V 335uV Front Panel Display Readback Vout 40mV _ mV V qut 40mV 335uV Load Effect Vou 1 1mV _ mV Vou 1 1mV 20uV Source Effect Vou 1 1MV mV Vout 1 1mV 20uV PARD Ripple and Noise Peak to Peak mV 9mV 904uV RMS 750 50uV Transient Response Time 0 _ my 100mV 12mV at 900 us Constant Current Tests Current Programming and Readback Low Current Ly 60mA mA 60mA 157A Front Panel Display Readback Tour 100mA mA Tour 100mA 1574A High Current 100A Tout 99 84A A 100 16A 41mA Front Panel Display Readback Tout 200mA mA Tout 200mA 1 Current Sink 10A Display Readback Lin 110mA mA Link 110mA 1 3mA PARD Ripple and Noise 0 mA 100mA 15mA RMS Load Effect Tou 12mA mA Tou 12mA 40 Source Effect Lu 12mA mA Tou 12mA 40 Enter your test results in this column Verification 25 Table 2 9 Performance Test Record for Agilent Model 6573A or 6673A MODEL Agilent Report No Date Test Description Minimum Results Maxim
130. eu PM 1 44 1 44 L202 zu MKS 4 50 0510 5545 244 5259 15V R203 2200PF 0 1 770 1 1KU 10PF 820 3 R212 R282 3000 4889 1000 19K 1448 19 L205 L206 Dag 568 1 44 DRIVE1 2 C222 60 4K 20889 T 11 3K 6 8 R204 1 19 350 C202 1 96K U204 127 R271 6 8 1 e AA A 9 35V sD 6 5 62K _7 49 IR2110 W200 DRIVES 3 C240 ee e DRIVES R272 UR201 FIN 71 01 21 Pau IXFMR1 IXFMR2 1000 XFMRS XFMR1 XFMR2 150 C211 e eT peus 4 4 0202 R209 R210 NOT LOCATED 2200PF NNV 1KU ON BORRD NOT LOADED 100 5x R286 HP32 1 4 BRIDGE DRIVER R285 65 i BRIDGE DRIVER D203 TO HEATSINK R263 AAA cese al 26 R237 DRIVE1 e pue LM aqe asa cs R247 q R255 DRIVE A i ANN IXFMR1 NOTES 100 5 1 UNLESS OTHERWISE SPECIFIED J200 2 1 1 44 ALL RESISTOR VALUES ARE IN OHMS 1 1 8M ALL CAPACITOR VALUES ARE IN MICROFARADS 4200 16 3 1 DRIVE B DRIVE2 17 8K 25V 230 R243 R251 o0PF ANN 9 09k VREF 109 15K 5 COMPENSATION de 1444 1 43K R244 IXFMR2 DUTY CYCLE 568 DETECT Figure 6 8 A3 FET Board Schematic Diagram amp GGGoo GXS 868 OJO
131. f Desig Agilent Part No Description ELECTRICAL PARTS Cl 0160 5422 Capacitor 0 047 20 C2 0160 4808 Capacitor 470pF 5 C4 0160 4787 Capacitor 22pF 5 100V C5 0180 0155 Capacitor 2 2uF 20V C6 7 0160 5422 Capacitor 0 047uF 20 C8 0160 4835 Capacitor 0 1uF 10 50V C10 12 14 16 0160 5422 Capacitor 0 047 20 C17 0180 0155 Capacitor 2 2 20V D1 2 1906 0229 Diode array 50V J2 1251 4927 Receptacle LCD display J3 1251 4926 Receptacle test header 14 5 1252 0718 Receptacle A3G1 A3G2 J6 1251 8184 Receptacle phone GPIB board L1 9140 0158 Inductor 1 10 1510 0560 Resistor network DIP R2 0698 3359 Resistor 12 7K 1 R23 25 27 30 0698 3155 Resistor 4 64K 1 R37 1810 0371 Resistor network SIP R38 0698 3441 Resistor 215 Q 1 0 125W R39 40 0698 3155 Resistor 4 64K 1 RTI 0837 0412 Thermistor VR16 1902 0950 Diode zener 4 7V 5 U3 1820 6721 IC MPU U4 5080 2466 ROM programmed front panel U6 1818 4792 IC memory U8 1820 2724 IC SN74ALS573BN W3 1258 0209 Jumper J3 W5 0811 3590 Jumper 0410 2159 Crystal 10Mhz MECHANICAL PARTS ES 1200 1274 Socket IC U3 1200 1417 Socket IC U4 0340 1277 Insulator 1 92 Replaceable Parts Table 5 5 2 Isolator Board Replaceable Parts for 657xA only Ref Desig Agilent Part No Description ELECTRICAL PARTS C800 0160 5
132. g the AC Input Board to the chassis 4 Note 8 of these screws also fasten L400 and T300 to the board via standoffs between the board and the chassis 5 Slide board forward and remove it from chassis 1 Fan 1 Remove the fan cable from A4J302 2 Remove the two screws securing the heatsink brackets to the fan bracket 3 Remove the two screws securing the fan bracket to the bottom of the chassis 4 Remove fan assembly fan and bracket from supply 5 Remove the screws washers nuts securing the fan to the bracket and separate the two Use size T 10 TORX screwdriver 74 Troubleshooting A2 ISOLATOR OR FLI AC FET OUTPUT A6 OUTPUT AS CONTROL GPIB BOARD INPUT FILTER HS ASSY HS ASSY FILTER BOARD BOARD A4 AC INPUT BOARD A3 FET BOARD AXSSSSSSSNSSRSSSSSSNSSSNNNSNANANANSN TES NET QU DOSE A4C416 C419 A4T300 BIAS XFMR FRONT DISPLAY A1FRONT KEYPAD Bi FAN A7 SNUBBER PANEL ASSY PANEL BOARD BOARD TOP VIEW Figure 3 20 Component Locations Top Cover and RFI Shield Removed Troubleshooting 75 Principles of Operation Introduction Figure 4 1 at the end of this chapter is a block diagram showing the major circuits within the power supply The supply s interface and control circuits consist of circuits on the Al Front Panel Board A2 GPIB or Isolator Board and A5 Control Board The power circuits are the A4 AC Input Board A3 FET Board A7 Snubber Board A6 Output Filter Board and a few com
133. grum TEST POINT 63 TEST POINT TEST POINT s9 d 6 3 00 Y 3 00 us div 25 00 ws 2 00 Y div 9 00 Y 208 15 00 us 4 00 V div 8 00 V 10 0 us div 50 99 us TEST POUT TEST POINT 2 00 V aiv 0 00 Y TEST POINT 62 50 0 ev div 0 00 Y 5 00 us div 9 000 96 0 nu qiv 250 0 TEST POINT TEST PoINT 67 Figure 6 1 Test Point Waveforms for Table 6 3 126 Diagrams A7 SNUBBER BOARD 4 Fu UNE FALTER A4 AC INPUT BOARD A3 FET BOARD ISEE FIG 6 7 E E4t6 Et e OR 6 8 AC E4120 o 415 1 INPUT J302 CHASSIS MOUNTED J CH COMPONENTS SEE OUTPUT XFMR T900 FIG 6 4 44 RECTIFIERS 0900 Jm li ANDCHOKELSQ0 SEE FIG 66 7 OR 6 8 J500 EAT o 418 419 AS CONTROL A6 OUTPUT 414 BOARD FILTER BOARD FRONT PANEL ASSY _ wl we gt gt gt 2 gt gt gt I t 9 i ISEE FIG 6 7 OUTPUT I TEMINALS 01 4 1 FIG 6 4 T i I EXTERNAL CONNECTOR w4 A2 ISOLATOR BOARD w4 GPIB 657xA SERIES SERIAL UNK SEE APPUCABLE SCHEMATIC IN THIS CHAPTER Figure 6 2 Circuit Board Cabling Diagram Diagrams 127 Figure 6 3 A1 Front Panel Board Component Location Diagram 128 Diagrams
134. gure 3 20 If the LED is there is still hazardous voltage inside the supply Wait until the LED goes off approximately 7 minutes after power is removed before proceeding RFI Shield The RFI shield covers most components on the A3 through A6 circuit boards as well as many of the chassis mounted components Remove the shield as follows 1 Remove four screws on each side securing shield to chassis Lift the RF shield out of the chassis 3 Connect a dc voltmeter across A4TP1 and A4TP2 see Figure 3 19 When the reading is 42 volts or less it is safe to work inside the power supply Troubleshooting 69 Front Panel Assembly Peel off vinyl trim one strip on each side of front panel to access the four screws that secure the front panel assembly to the chassis Remove the four screws two on each side using a size T 10 TORX Disconnect phone cable W5 from J6 on the Al Front Panel Board Record the color code and the location of each of the four wires connected to line switch S1 Disconnect the wires from the switch assembly Remove the front panel assembly eU by S1 Line Switch 1 Remove Front Panel Assembly and disconnect switch wires as described in that procedure 2 Release the switch locking tabs by pressing them inward against the body of the switch and removing the switch A1 Front Panel Board 1 Remove the Front Panel Assembly and disconnect the switch as described under Front Panel Assembly 2 Disc
135. hat you first locate the appropriate Performance Test Record sheet from Tables 2 7 through Table 2 11 for your specific model Make a copy of this sheet and record the actual observed values in it while performing the tests Use the sheets in Tables 2 7 through Table 2 11 as master reference sheets to run copies at any time Operation Verification Tests Table 2 3 lists the requirements for operation verification which is a subset of the performance tests Table 2 3 Operation Verification Tests Test Refer 1 Turn On Checkout Power Supply Operating Manual 2 Voltage Programming and Readback Accuracy Table 2 4 3 Current Programming and Readback Accuracy Table 2 5 Record the results of Tests 2 and 3 in the appropriate Performance Test Record sheets 14 Verification Performance Tests Performance tests check all the specifications of the power supply The tests are grouped into constant voltage mode tests Table 2 4 and constant current mode tests Table 2 5 Constant Voltage CV Tests Test Setup Connect your dc voltmeter leads to only 4S and S see Figure 2 1 because the power supply regulates the voltage between these points not between the and output terminals Test Procedures Perform the test procedures in Table 2 4 The CV tests are Voltage Programming and Readback Accuracy CV Load Effect CV Source Effect CV Noise PARD Transient Recovery Time Note The tests are ind
136. he top cover and RFI shield see Disassembly Procedures Remove the A5 Control Board from the output subchassis see Disassembly Procedures Lay the board component side up on a piece of insulating material adjacent and close to the supply Make the following connections a Ribbon cable W3 from A5J509 to A4J500 b Phone cable W4 from A5J502 to A2J107 c Testcable 2 wire cable assembly Agilent P N 5080 2169 from A5J503 to A3J200 d Make a 12 inch test jumper cable from two 20 pin connectors Agilent P N s 1251 8666 and 1251 8667 and 20 feet of wire 24 26 AWG Use the cable to connect A5J510 to A6J900 You may now proceed with the specific tests for the A5 Control Board F OTH A3 FET Board Troubleshooting Because test points on the FET board are not accessible when the board is installed troubleshooting must be performed with the board removed from the power supply Both static power removed and dynamic power applied troubleshooting procedures are provided The location of different test points are shown by encircled numbers on the A3 FET Board schematic and component location diagrams see Chapter 6 Note If any power FET Q201 204 Q211 Q222 Q233 or Q244 is defective you must replace all eight with a matched set Table 3 4 FET Troubleshooting Chart Procedure Result Static Troubleshooting 1 Turn the power supply off and remove the A3 FET board with its heatsink assembly attac
137. hed see Disassembly Procedures 2 Measure the resistance between the Rail E502 and the Rail E501 gt 20 MQ 3 Measure the resistance between the gate of each FET Q201 204 Q211 Q222 Q233 gt 15 kQ and Q244 and common Rail Troubleshooting 53 Table 3 4 FET Troubleshooting Chart continued Procedure Result Static Troubleshooting 4 Measure the resistance across capacitor C201 150 5 Measure the resistance across the 15 bias input E506 to E507 kQ in the forward direction and 490 Q in the reverse direction Dynamic Troubleshooting 1 Turn off the power supply and remove the FET Board with its heat sink assembly See Disassembly Procedures 2 Short the collectors of Q251 and Q252 by connecting the collector case of each transistor to common E507 3 Connect waveform generator to J200 1 and J200 2 4 Set generator to produce a 20KHz 20V p p triangular waveform See Figure 3 14A 5 Connect 15V from an external supply to E506 positive and E507 common Note All of the following measurements are taken with respect to E507 common test point 26 on A3 FET Board schematic diagram 6 Check bias voltage at U203 1 27 45V 7 While adjusting the external 15V supply input check the bias trip point at U204 1 4 Voltage goes from low OV to high 5V at an input of approximately 12V and from high to low at
138. ification Tests ii D eei irre dasa edad Eg s EEN E rinnen 14 Performance e 15 Constant Voltage CV y FREUEN ERR FEE REESE ERR 15 Test S pn Uit astitit IR biet E En 15 Test Proced0fes M EE 15 Constant Current CC Tests deste n edicere a aed ets 19 Test Setup DURER SP 19 a ua 19 Averaging CC Measurements esteem temet ERE ERE net REESE ttr pe SEE HEX t Een E 22 TroubleShooting_ vo dre 29 Introduction G 29 Locahzing the Problem sssrin rt SE Re 29 Chapter Organization zoe eR Bette RU cutie eR RU eere exte PIER Gee esc liste ens 29 Test Equipment Required teet PR terc et eit eee b Res ecce 30 Troubleshooting Procedures e teh EUMD 30 epe ep re reir ien tu EP OE TUE 30 Ib oup M 30 Disabling The Power On Selftest EE erre 30 Using the TST Query GPIB Systems Supplies Only sese 30 Troubleshooting Charts ete ite e peo tere epe pO 32 Troubleshooting Test ys tese re
139. ions are fully understood and met The CAUTION sign denotes a hazard It calls attention to an operating procedure or the like which if not correctly CAUTION 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 Safety Symbol Definitions Symbol Description Symbol Description Direct current g Terminal for Line conductor on permanently installed equipment Alternating current Caution risk of electric shock d Both direct and alternating current d Caution hot surface qr Sue Three phase alternating current Caution refer to accompanying documents Earth ground terminal L In position of a bi stable push control Protective earth ground terminal Out position of a bi stable push control 1 Intended for connection to external protective conductor Frame or chassis terminal On supply N Terminal for Neutral conductor on Off supply permanently installed equipment Terminal is at earth potential Standby supply Used for measurement and control Units with this symbol are not completely circuits designed to be operated with disconnected from ac mains when this switch is one terminal at earth potential off To completely disconnect the unit from ac mains either disconnect the power cord or have a qualified electrician install an ex
140. istor 464 Q 1 0 125W 0683 1005 Resistor 10 Q 5 O 25W 0698 4123 Resistor 499 Q 1 0 125W 0757 0273 Resistor 3 01K 1 0698 3430 Resistor 21 5 Q 1 0698 3279 Resistor 4 99K 1 0757 0283 Resistor 2K 1 0 125W 0698 3456 Resistor 287K 1 0757 0440 Resistor 7 5K 1 0699 3103 Resistor 19K 0 05 0699 2248 Resistor 47 5K 0 05 0699 2247 Resistor 121K 0 05 0699 2198 Resistor 243K 0 05 0698 3279 Resistor 4 99K 1 5080 2150 GAL programmed main 1826 1370 IC 365 110 Replaceable Parts Table 5 9 A5 Control Board Replaceable Parts continued Ref Desig Agilent Part No Description ELECTRICAL PARTS U504 5080 2250 IC secondary U505 1826 1369 IC voltage regulator U507 1826 2187 IC D A converter U508 1826 1896 IC linear U509 1826 2187 IC D A converter U510 1826 1896 IC linear U511 1826 2187 IC D A converter U512 1826 1896 IC linear U513 1826 1370 IC 365 U517 1826 0161 IC 324 U518 1826 1370 IC 365 U600 1820 3199 IC MC74HC4040N U601 1820 2922 IC MC74HCOON U602 1820 3081 IC MC74HC74N U603 1826 2343 IC VRGLTR SWG U604 1820 2922 IC MC74HCOON U605 1826 0065 IC 31 1 U606 1858 0083 Transistor array 14P DIP U607 1826 0962 IC 412 U608 1826 0890 IC 358A U609 1826 1343 IC voltage regulator U612 615 1826 1409 IC 1013 U617 1826 1895 Precision op amp U618 621 1826 0962 IC 412 U630 1826 1370 IC 365 VR630 1902 1377 Diode zener 6 19V VR631 1902 0018 Diode zener IN941 Y501 04
141. k Screw cap 1 4 x 20 bus bar Screw mch 10 32 caps ac input Screw mch M3x0 5 8 mm lg sense term Screw mch M3x0 5 10 mm lg front frame Q901 to heat sink 5 Screw mch M4x0 7 8 mm lg Qty 2 for Isolator to chassis mtg Standoff Qty 2 for Isolator to chassis mtg Flatwasher Qty 2 for Isolator to chassis mtg Split washer Qty 2 for Isolator to chassis mtg Nut Qty 2 for Isolator to chassis mtg Cover for Isolator to chassis mtg Screw mch M3x0 5 16m lg fan Screw mch M4x0 7 12 mm lg line choke busbar to support output choke output xfmr diode block Screw mch M4x0 7 mm lg cap RFI fan brkt GPIB cover A6 output Filter bd gnd A5 Control bd to subchassy diode block and A7 Snubber bd to heat sink Screw mch 4 0 7 50 mm long bias xfrmr Screw mch 5 0 8 10 mm long strap handles Screw mch M3x0 5 10 mm long FETs to sockets Screw mch M4x0 7 8 mm long FET bd mtg Shield RFI Side trim strips Standoff hex 0 255 in GPIB connector Standoff hex 8 mm control bd mtg Standoff slide mtg A5 Control bd to chassis Standoff hex 8 mm FET bd mtg Strap handle Terminal crimp AC power cord Terminal crimp AC power cord gnd Thermal pad Washer flat diode block to heat sink Washer spring diode block to heat sink Washer flat caps to bus bars Washer flat choke to bus bar Washer spring blvl current shunt to A6 output bd Washer flat A6 output and A5 Control bd to subchassis Washer flat cu
142. le the power supply output Principles Of Operation 81 Fan Speed Control A fan speed control circuit U304 U311 provides the dc voltage to operate the cooling fan A pulse width modulated signal FAN PWM from the secondary microprocessor on the A5 Control Board varies this voltage to increase or decrease the fan speed according to the ambient temperature The secondary microprocessor determines the level of FAN PWM by monitoring a fan speed signal FAN DETECT and the ambient temperature as measured by the voltage drop across a thermistor A4RT300 Chassis mounted fan BI is shown on A4 AC Input Board schematic A3 FET Board The A3 FET Board has 8 power FET stages and 2 bridge driver IC s see A3 FET Board schematic The power FETs are mounted on but are electrically isolated from a heat sink assembly The FET stages are connected from the RAIL and the RAIL to the power transformer T900 in an H bridge configuration DRIVE A and DRIVE B pulses received from the A5 Control Board are used by the bridge driver ICs U201 and U202 to derive control pulses DRIVEI and DRIVE2 for the FET switches The width of these pulses determines the ON time of the FET switches thereby determining the magnitude of the output voltage or current DRIVEI pulses turn on one set of RAIL Q201 Q211 and Rail Q203 Q233 FETS causing current to flow through power transformer T900 in one direction DRIVE2 pulses turn on the other set of RAIL Q204 Q244
143. lloscope 5 Electronic Load 6 Current Monitoring Shunt Verification 23 Table 2 7 Performance Test Record for Agilent Model 6571A or 6671A MODEL Agilent Report No Date Test Description Minimum Results Maximum Measurement Spec 5 Spec Uncertainty Constant T Tests Voltage Programming and Readback Low Voltage OV Vout 8mV mV 8mV 1 Front Panel Display Readback Vout 12mV mV Vout 12mV 1 6uV High Voltage 8V Vout 7 9888V V 8 0012V 88UV Front Panel Display Readback Vout 16mV mV Vou 16mV 88uV Load Effect V qu 0 46mV 0 46mV luv Source Effect Vou 0 46mV _ mV Vou 0 46mV luv PARD Ripple and Noise Peak to Peak 7mV 872uV RMS 650 50uV Transient Response Time 0 100mV 12mV at 900 us Constant Current Tests Current Programming and Readback Low Current OA Ij 125mA mA 125mA 1 5 Front Panel Display Readback Tout 150mA mA Tout 150mA 1 5 High Current 220A Tout 219 655 220 345A 68 5mA Front Panel Display Readback Tout 370mA mA Tout 370 68 5mA Current Sink 10A Display Readback Link 160mA mA Link 160mA 2 6mA PARD Ripple and Noise mA 200mA 50mA RMS Load Effect La 21mA mA Lu 21mA 166A Source Effect Ton 21 mA Tou 21mA 166A Enter your test results in this column 24 Verification Table 2 8 Performance T
144. lso be used to program the output current The IP signal is applied to the CC Error Amplifier via the IPROG Amplifier P O U618 A 0 to 10V differential input level produces a proportional zero to full scale output current Switching Downprogramming Control These circuits A5 Control Board schematic Sheet 3 include a Ramp Generator Fast Sense Differential Amplifier Summing Amplifier Divider Pulse Width Modulator Downprogramming Control and Overvoltage Comparator circuits The OR GATE signal CV or CC control signal as previously described is summed with a fixed 40 KHz triangular waveform produced by the Ramp Generator An input from the Fast Sense Differential Amplifier also is summed in order to compensate for sudden transients in the rectified output The Ramp Generator derives its output signal from 40KHz pulses received from the Divider circuit The Divider circuit also generates output pulses for a Deadtime Latch and an On Latch The Divider clock input is the 2MHz ALE CK signal from 80 Principles Of Operation the secondary microprocessor The width of the output pulses from the Summing Amplifier vary as the OR_GATE control signal decreases or increases These pulses are applied to the Pulse Width Modulator IC via the On Latch The Pulse Width Modulator generates the square wave pulses that are applied to the A3 FET Board to turn the FET switches on and off The Deadtime Latch resets the On Latch to provide a minimum dead off time
145. lter amp A7 Snubber Boards Assembly Diagrams 65 6671A 72A TO FET BD 201 lt SNUBBER BD 61 PINS 1 4 TO FET BD TB201 PINS 5 8 T900 LOCATED amp ON OUTPUT L900 SUB CHASSIS NOTE 1 2 amp SHIELDS ARE NOT USED ON 8U UNITS TH Qa SNUBBER BD v FROM HERTSINK CRECTIFIER CATHODE 37 C911 TP9 TP3 12 C913 C907 W901 4900 i 44 206 250VAC 1000PF 250VAC e gt BUSBAR 1 410905 09013 10905 0003 lt 904 R909 RO10 BEEN Co06 51 51 1901 7122000 1902 ELS 2000 T22000 722000 7 2000 sx sx 16V T22000 16U 16 16V 16V 2 5UH 2 5UH 16V L903 L904 NOT TPS USED As Qu OUT BUSBAR DPS R906 517 5x 0908 1 44 1900 12 0UT Z 1000PF 250VAC J900 11 QUT TP6 DPS CATS 55 ISEN y 900 4 ISEN 250URC Eu ISEN 900 5 ISEN 77 14 3U J900 6 F901 F902 10A 10A 5956 J900 2 C915 GND D910 D911 4900 16 1 4150 1N4150 LOADED 250VAC J900 17 120 0901 DPS 3900 1 eee 1 DOWNPROGRAMMER SHUNT 169 0910 464 IRFIP044 DPS y 900 2
146. moved from the power supply without first removing the Output Subchassis as previously described If the output subchassis has not been removed disconnect cables from the A5 board as described in Step 4 of the Output Subchassis and then remove the 5 board as follows Troubleshooting 71 Remove two screws securing the board to the Output Subchassis Slide the 5 board upward and free of the two standoff mounts and the plug in connection A5J510 A6J900 with the Output Board 3 Remove board from the output subchassis N A6 Output Filter Board 1 Remove the A5 Control Board as described in that procedure 2 the Output Filter Board remove the nut securing the lead from choke L900 3 Remove the bolt that secures the Output Filter Board OUT out bus bar to the heat sink 4 Remove the screws that secure the Output Filter Board downprogrammer MOSFETs 0901 0902 to the heat sink Use size T 10 TORX screwdriver Note Apply a thermal compound before you reconnect 0901 0902 to the heat sink 5 Remove three screws that secure the Output Filter Board to the Output Subchassis 6 Slide the Output Filter Board forward to release it from stand offs 5 and lift the board out of the subchassis A7 Snubber Board and D900 Output Rectifier 1 Remove two bolts securing the leads from the Snubber Board and transformer T900 to output rectifiers D900 mounted on the heat sink assembly 2 Remove screw securing the Snubber Boa
147. nature analysis SA This technique is similar to signal tracing with an oscilloscope in linear circuits Part of the microprocessor memory is dedicated to SA and a known bit stream is generated to stimulate as many nodes as possible within a circuit Because it is virtually impossible to analyze a bit stream with an oscilloscope a signature analyzer is used to compress the bit stream into a four character signature By comparing the signatures of the IC under test to the correct signature for each node you can isolate faults to one or two components The following general rules apply to signature analysis testing 1 Be sure to use the correct test setup connections for the specific test When examining an IC note the correct signatures for 5 and for common If an incorrect signature matches either one it probably indicates a short to that part of the circuit 3 Iftwo IC pins have identical signatures they are probably shorted 4 If two IC signatures are similar it is only a coincidence 5 Ifaninput pin of an IC has an incorrect signal but the signal source output of the previous IC is correct then look for an open printed circuit track or soldering problems 6 Ifthe output signature of an IC is incorrect it could be caused by that IC However it could also be caused by a short at another component that is connected to that output Firmware Revisions Each signature analysis table in this chapter shows the power sup
148. nstrument s external markings described under Safety Symbols WARNING Servicing instructions are for use by service trained personnel To avoid dangerous electrical shock do not perform any servicing unless you are qualified to do so BEFORE SWITCHING ON THE INSTRUMENT the protective earth terminal of the instrument must be connected to the protective conductor of the mains power cord The mains plug shall be inserted only in an outlet socket that is provided with a protective earth contact This protective action must not be negated by the use of an extension cord power cable that is without a protective conductor grounding Grounding one conductor of a two conductor outlet is not sufficient protection If this instrument is to be energized via an auto transformer for voltage change make sure the common terminal is connected to the earth terminal of the power source Any interruption of the protective grounding conductor inside or outside the instrument or disconnecting of the protective earth terminal will cause a potential shock hazard that could result in personal injury Whenever it is likely that the protective earth connection has been impaired this instrument must be made inoperative and be secured against any unintended operation Only fuses with the required rated current voltage and specified type normal blow time delay etc should be used Do not use repaired fuses or short circuited fuseholders To do so could c
149. nt Panel Board for all 667xA Models see Table 5 4 Front Panel Board Tested amp Initialized see Table 5 4 06571 61001 06572 61001 6573A 06573 61001 6574A 06574 61001 6575A 06575 61001 A2 5060 3398 Isolator Board see Table 5 5 A2 5060 3592 GPIB Board see Table 5 6 A3 5060 3338 FET Board Heat Sink Assembly see Table 5 7 A4 5060 3341 AC Input Board see Table 5 8 AS Control Board see Table 5 9 6571A 6671A 06671 61020 6572A 6672A 6573A 6673A 6574A 6674A 06674 61020 6575A 6675A 06675 61020 A6 06671 61024 06672 61024 06673 61024 Output Filter Board see Table 5 10 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 06674 61024 6575A 6675A 06675 61024 7 06671 61021 06672 61021 06673 61021 06674 61021 06675 61021 Snubber Board see Table 5 11 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A Bl 5060 3436 Fan assembly C416 419 0180 4369 Capacitor 1500 400V D900 Diode rectifier 6571A 6671A 1906 0396 6572A 6672A 1906 0397 6573A 6673A 1906 0398 6574A 6674A 1906 0398 6575A 6675A 1906 0404 9135 0439 Filter RFI 1900 1251 8667 Connector post test point L900 Choke output Model specific Al Al 6571 6572 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A 06671 80003 06673 80003 06674 80003 06675 80003 06676 80003 06672 61020 06673 61020
150. nt temperature readback test failed power on and TST CV or CC DAC tests failed power on Microprocessor A1U3 ROM AIU4 or address latches AIU8 Possibly due to power loss during a write operation See Checksum Errors in Chapter 3 of Operating Manual If power loss is not the problem EEPROM A1U6 could be defective If you replace AIUG the power supply must be reinitialized and calibrated RAM A2U108 Microprocessor A2U114 ROM A2U106 Talker listener A2U117 Microprocessor A5U504 Microprocessor A5U504 Comparators A5U513 readback DAC A5U511 U512 or secondary bias supply 5Vs A4U304 Thermistor ASRT770 or comparator 50513 CV DAC 50507 0508 CC DAC A5U509 U5 10 see Figure 3 7 NOTE The following error messages can appear due to a failure occurring either while the power supply is operating or during selftest SERIAL TIMOUT SERIAL DOWN UART PARITY Serial data line failure on A2 board Serial data line failure on A2 board UART failed See Figure 3 10 system or Figure 3 11 bench See Figure 3 10 system or Figure 3 11 bench UART A2U112 UART FRAMING UART OVERRUN SBUF OVERRUN UART failed UART failed Serial buffer failure UART UART 20112 UART A2U112 UART A2U112 defective or GPIB board is in SA mode UART A2U112 defective or GPIB board is in SA mode EEPROM AIUG defective or calibration error See Figure 3 12 SBUF FULL Serial buffer failure EE WRITE ERR SECOND
151. o all models of the series Wiring connections to external equipment are shown in the Power Supply Operating Manual Chapter Organization Table 6 1 summarizes the contents of this chapter Table 6 1 Summary of Chapter Contents Function Description See Interconnections Drawing identifying each circuit board the cables between boards and schematic Figure 6 2 diagram for each board Schematics Show test points signal mnemonics component location grid coordinates and specific notes General notes applicable to all schematics are given in Table 6 4 Al Front Panel Board A2 GPIB Board Used in 667xA Series only A2 Isolator Board Used in 657xA Series only A3 FET Board 4 Input AC Power Board 5 Control Board 3 sheets Secondary Interface and CV CC Readback DACS CV CC Control Circuits Switching Down Programmer Control OV Monitor Agilent 6571A 72A 6671A 72A A6 Output Filter Board amp A7 Snubber Board Agilent 6573A 74A 6673A 74A A6 Output Filter Board amp 7 Snubber Board Agilent 6575A and 6675A A6 Output Filter Board amp A7 Snubber Board Signal Names Table of signal name mnemonics Table 6 2 Parts Location A drawing that shows the location of components on a circuit board is located next to the above circuit board schematic diagram A drawing showing location of each circuit board in the chassis is in Chapter 3 Figure 3 19 Test Points Description of each test point Table 6 3 Location
152. onnect LCD display ribbon cable W2 from J2 on the Al Front Panel Board Note When reinstalling the LCD ribbon cable be sure to line up the stripe of the ribbon cable with pin 1 on J2 3 Use a small Allen wrench 0 050 to loosen the set screws that are inset in the knobs These are the and AIG2 Voltage Current control shafts that extend through the front panel Remove knobs and shaft bushings Note Be careful not to unscrew the knob set screws too far out as they can easily fall out of the knob and become lost 4 Remove screw if installed that secures board to the Front Panel Assembly The screw is located near J4 on the Front Panel Board 5 Lift tab near J6 on front panel board and slide left to release board from the Al Front Panel Assembly and remove board A1DSP1 LCD Display 1 Remove the Al Front Panel Board as described in that procedure 2 Remove the nuts securing the LCD display to the front panel assembly and remove the LCD and attached ribbon cable see CAUTION below When reinstalling this cable be sure to line up the cable stripe over the LCD connector pin marked with a square The display connector is fragile When removing the cable from the LCD display carefully rock the CAUTION p cable connector back and forth while gently pulling it back A1G1 and A1G2 Rotary Controls 1 Remove the Front Panel Board as described in that procedure 2 Remove the and AIG2 cables from connectors A
153. oot 06671 00007 06671 00007 5001 6749 5001 6749 06671 00008 06671 00008 5001 6750 5001 6750 5001 6750 Bus bar heat sink Model specific Bus bar minus Model specific 88 Replaceable Parts Table 5 3 Main Chassis Replaceable Parts continued Ref Desig Agilent Part No Description MECHANICAL PARTS continued Bus bar plus Model specific 6571A 6671A 06671 00009 6572A 6672A 06671 00009 6573A 6673A 5001 6751 6574A 6674A 5001 6751 6575A 6675A 5001 6751 5041 8819 Cap strap handle 5041 8820 Cap strap handle 5060 3334 Chassis assy 1400 0611 Clamp cable phone cable 1531 0309 Clevis A2 GPIB bd 9170 1138 Core mtg assy 5001 6745 5001 6758 Fan bracket 5001 6747 FET chassis 5020 2741 FET heat sink 5001 6748 Front panel 5040 1664 Front panel frame 5020 2740 Heatsink diode 0340 0458 Insulator mica FETs to heat sink 0370 3238 Knob front panel RPG control 6571A 06571 80001 Nameplate 6572A 06572 80001 Nameplate 6573A 06573 80001 Nameplate 6574A 06574 80001 Nameplate 6575A 06575 80001 Nameplate 6671A 06671 80001 Nameplate 6672A 06672 80001 Nameplate 6673A 06673 80001 Nameplate 6674A 06674 80001 Nameplate 6675A 06675 80001 Nameplate 0590 0534 Nut s
154. p C914 1000pF Agilent P N 0160 4183 Qty 2 Pin Solder El 3 Agilent P N 1251 0600 Qty 3 2 Diode D910 amp D911 Agilent P N 1901 1098 Qty 2 3 Resistor R917 3K 5 2W Agilent P N 0698 3642 Qty 1 DELETE 1 Resistor R935 6 19K 1 1 8W Agilent P N 0757 0290 Qty 1 2 Resistor R910 3K 5 2W Agilent P N 0698 3642 Qty 1 CHANGE Resistor R937 from 1 21K 1 1 8W Agilent P N 0757 0274 to 169 Ohm 1 1 8W Agilent P N 0698 4416 Qty 1 CHANGE 7 In Table 5 9 DELETE Resistor R550 4 99K 1 1 8W Agilent P N 0698 3279 Qty 1 ADD Resistor R896 4 99K 1 1 8W Agilent P N 0698 3279 Qty 1 CHANGE 1 Zener diode VR630 from 6 2V 2 0 4 W H P P N 1902 0509 to 6 19V 2 0 4W Agilent P N 1902 1377 Qty 1 2 Resistor R861 from 267 Ohm 1 1 8W Agilent P N 0698 4446 to 499 Ohm 1 1 8W Agilent P N 0698 4123 Qty 1 ADD Capacitor C900 100pF 5 100V Agilent P N 0160 4801 Qty 1 CHANGE 8 In Table 5 4 ADD Core Magnetic Agilent P N 9170 1497 Qty REF FP Phone Cable To Chassis CHANGE Assembly PCB Keypad from Agilent P N 5060 3427 to Agilent P N 5060 3464 Qty 1 CHANGE 9 In Table 5 3 DELETE CE SHIPPING LABEL Agilent PN 5080 2247 amp CE INSTRUMENT LABEL Agilent P N 5080 2248 150 Backdating CHANGE 10 In Table 5 11 CHANGE Capacitor C990 C991 from 0 015uF 10 200V Polyester Foil Agilent P N 0160 0194 to 0 015 5 400V Polypropylene Foil Agilent P N 0160 6896 Qty 2 CHANGE 11 Applic
155. pecific 6571A 6573A 6671A 6673A 6574 6674A 6575A 6675A R936 Model specific 6571A 6671A 6572A 6575A 6672A 6675A Agilent Part No Description ELECTRICAL PARTS 0698 3311 Resistor 51 5 2W Mo 0698 3642 0764 0034 0699 1060 0699 1075 0812 0019 0699 1060 0699 1075 0757 0273 0698 3358 0698 0082 0764 0016 0698 3646 0698 0082 0698 0082 0698 0082 0757 0290 0757 0451 Not used Resistor 3K 5 2W Mo Resistor 47K 5 2W Mo Resistor 0 05 Q 1 3W Resistor 0 1 Q 1 3W Resistor 0 33 Q 5 3W PW Not used Resistor 0 05 Q 1 3W Resistor 0 1 Q 1 3W Resistor 3 01K 1 Resistor 4 02K 1 Resistor 464 Q 1 0 125W Not used Resistor 1K 5 2W Mo Not used Resistor 12K 5 2W Mo Not used Resistor 464 1 0 125W Not used Not used Resistor 464 Q 1 0 125W Not used Resistor 6 19K 1 Not used Not used Resistor 24 3K 1 Replaceable Parts 115 Table 5 10 A6 output Filter Board Replaceable Parts continued Ref Desig R937 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A R938 Model specific 6571A 6671A 6572A 6575A 6672A 6675A T900 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A U901 Model specific 6571A 6671A 6572A 6575A 6672A 6675A VR901 6571A 6671A 6572A 6672A 6573A 6575A 6673A 6675A W900 901 W910 911 Model
156. ply firmware revision for which the table is valid If needed for a Bench Supply you can confirm the firmware revision of your power supply by checking the label on the Front Panel ROM AIU3 and on the Secondary microprocessor A5U504 You can obtain the revisions on a Systems Supply with the GPIB IDN query command The following sample Agilent BASIC program does this 10 ALLOCATE L 52 20 OUTPUT 705 IDN 30 ENTER 705 1 40 DISP L 50 END For a typical Model 66714 the controller will return a string with four comma separated fields as follows Agilent Technologies 6671A 0 fA 01 05sA 01 04pA 01L01 The first three fields in the string are the manufacturer model number and 0 The last field gives the firmware information as follows f front panel firmware revision A 01 05 s secondary interface firmware revision A 01 04 p primary interface firmware revision A 01 01 Test Headers The power supply has two test headers as shown in Figure 3 15 each with a jumper that can be moved to different positions for SA testing and for other functions To gain access to the headers remove the power supply top cover 56 Troubleshooting Pins Description Primary Interface Test Connector A2J106 Systems Supplies Only 7 and 8 FLT INH 1 and 2 SA Mode 3 and 4 DIG I O 5 and 6 RELAY LINK Normal operating and storage position DIG CNTL port is configured for fault indicator FLT output and r
157. ponents mounted on the chassis Each block in Figure 4 1 identifies a schematic diagram in Chapter 6 where the circuits are shown in detail You can refer to the schematic to locate specific components mentioned in this description Chapter 6 also has a cabling diagram Figure 6 2 showing the circuit board interconnections INTERFACE CONTROL CIRCUITS A2 GPIB Board 667xA Series Only Circuits on the A2 GPIB board see A2 GPIB Board schematic provide the interface between the GPIB controller and the power supply All communications between the power supply and the GPIB controller are processed by the GPIB interface and primary microprocessor circuits on the A2 board The primary microprocessor circuits microprocessor U114 ROM U106 and RAM U108 ICs decode and execute all instructions and control all data transfers between the GPIB controller and the Secondary Interface on the A5 Control Board The primary microprocessor also processes measurement and status data received from the Secondary Interface A UART universal asynchronous receive transmit IC U112 on the A2 board converts data between the primary microprocessor s 8 bit parallel bus and the serial I O port The serial data is transferred between the primary interface and the secondary interface via a programmed GAL gated array logic U119 optical isolator ICs U110 U111 These ICs isolate the primary interface circuits referenced to earth ground from the secondary in
158. r R713 1 Meg 1 1 8W Agilent P N 0698 8827 Qty 1 5 Capacitor C885 0 1uF 50V Agilent P N 0160 4835 Qty 1 6 Capacitor C760 18 100V Agilent P N 0160 4788 Qty 1 7 Capacitor C681 0 01uF 100V Agilent P N 01604832 Qty 1 8 Diode D618 Agilent P N 1901 0880 Qty 1 CHANGE 1 Resistor R893 from 10K 1 1 8 Agilent PN 0757 0442 to 7 5K 1 1 8w Agilent P N 0757 0440 Qty 1 2 Resistor R805 from 20K 0 1 1 8 Agilent PN 0699 0118 to 19K 0 05 1 8w Agilent P N 0699 3103 Qty 1 3 Resistor R809 from 16 15K 0 1 1 8w Agilent PN 0699 0489 to 19K 0 05 1 8w Agilent P N 0699 3133 Qty 1 CHANGE 5 In Table 5 9 CHANGE Capacitor C684 from 2 2 Agilent P N 0160 7277 to 3 3uF Agilent P N 0160 7308 Qty 1 DELETE IC Socket 40 Pin REF U504 Agilent P N 1200 0552 Qty 1 ADD 1 Resistor R885 2 0K 196 1 8W Agilent P N 0757 0283 Qty 1 2 Resistor R862 3 01K 1 1 8W Agilent P N 0757 0273 Qty 1 3 Resistor R861 257 Ohm 1 1 8W Agilent P N 0698 4446 Qty 1 4 Resistor R713 2 7 Meg 596 1 4W Agilent PN 0683 2755 5 Capacitor C885 0 1uF 50V Agilent P N 0160 4835 Qty 1 6 Capacitor C760 18pF 100V Agilent P N 0160 4788 Qty 1 7 Capacitor C681 4700pF 100V Agilent P N 0160 4831 Qty 1 8 Diode D618 Agilent P N 1901 0880 Qty 1 CHANGE Resistor R893 from 10K 1 1 8W Agilent P N 0757 0442 to 7 5K 1 1 8W Agilent P N 0757 0440 Qty 1 Backdating 149 CHANGE 6 In Table 5 10 ADD 1 Capacitor C913 am
159. rd to the heat sink and remove the board 3 Remove two bolts securing D900 to the heat sink and remove D900 Note When replacing D900 follow the procedure given in Figure 3 19 T900 Output Power Transformer L900 Output Choke 1 Remove the bolt and nut that connect transformer T900 and choke L900 leads together two from T900 and one from L900 The bolt is accessible through a hole in the Output Subchassis 2 Remove T900 or L900 by removing the four screws that secure each component to the Output Subchassis AC Input Filter 1 Remove the Top Cover and the RFI Shield as described in their respective procedures 2 Remove the A2 board as described under Rear Panel and or A2 GPIB or Isolator Board earlier 3 Disconnect the ac line and neutral output lines going to the A4 AC Input Board load side of the filter 4 Remove four screws securing the Input Filter to the chassis and lift the filter out of chassis When you replace the filter connect the load side to the AC Input Board 72 Troubleshooting START 2 3 TURNS FINGER TIGHT 2 3 TIGHTEN A AND BETWEEN 5 AND 10 IN LBS TIGHTEN BETWEEN 8 AND 10 IN LBS TIGHTEN A AND BETWEEN 30 AND 40 IN LBS DON FIG3 19 GAL Figure 3 19 Proper Mounting Procedure for Output Rectifiers D900 A3 FET Board and Heatsink Assembly 1 Ce ty Disconnect cables wires from the following points a 15Vp bias cable W8 from A4J400 on the AC Input Board b
160. red and black rail cable W9 leads from E411 and E412 on the AC Input Board c 2 wire cable W7 from A3J200 on the FET Board Remove screw securing the FET heatsink to the fan assembly Remove screw securing the FET heatsink to the bottom of the main chassis Slide the FET Board Heatsink Assembly forward and lift it out of chassis Pry up the plastic tabs securing the FET Board and the Heatsink Assembly to the metal bracket and separate the heatsink from the bracket To further separate the A3 FET Board from the Heatsink Assembly proceed as follows Troubleshooting 73 CAUTION Observe standard antistatic practices against ESD when working with the MOSFETs Refer to Chapter 1 for more information on antistatic procedures Remove four screws securing the FET Board to the Heat Sink Assembly Remove the two screws securing each of the eight MOSFET s to the Heatsink Assembly and the sockets on the FET Board Use a size T 10 TORX screwdriver to remove these screws 3 Unplug each MOSFET from the socket on the FET Board and separate the board from the Heat Sink Assembly N Note When you replace these MOSFETs Q201 204 211 222 233 244 be sure to install the appropriate mica insulator see Replaceable Parts between each MOSFET and the heat sink A4 AC Input Board 1 Remove the A3 FET Board and Heatsink Subassembly as described in the combined procedure 2 Disconnect the cable from A4J302 3 Remove the 13 screws securin
161. rement in CC mode with output shorted VMON Sheet 2 CV mode 4 6V CC mode CV CONTROL Sheet 2 CV mode 2 4V CC mode 12V CV Sheet 2 CV mode 0V CC mode 5V CC CLAMP AMP output CV mode 2 2V CC mode 2 2V Sheet 2 1ST I AMP output Sheet 2 CV mode 0V CC mode 0 6V 2ND I AMP output Sheet 2 CV mode 0V CC mode 4 5V CC CONTROL Sheet 2 CV mode 15V CC mode 0 4V CC Sheet 2 CV mode 5V CC mode 0V FAST SENSE AMP CV mode 4V CC mode 0V Sheet 3 RAMP GEN Sheet 3 See Figure 6 1 RAMP GEN Sheet 3 See Figure 6 1 DIVIDER output Sheet 3 See Figure 6 1 SUMMING POINT Sheet 3 See Figure 6 1 DEADTIME LATCH Sheet 3 See Figure 6 1 Diagrams 123 Table 6 3 Troubleshooting Test Points continued TEST POINT Signal Tested Measurement and Conditions No amp Loc 65 U605 7 SUMMING See Figure 6 1 COMPARATOR Sheet 3 U600 10 DIVIDER CLOCK Sheet 3 See Figure 6 1 U601 6 DIVIDER RESET Sheet 3 See Figure 6 1 U601 3 ON LATCH CLOCK See Figure 6 1 Sheet 3 U604 3 ON LATCH Sheet 3 See Figure 6 1 U603 3 PWM EN Sheet 3 Held high for approximately 12 seconds at power on then goes low U603 13 VOS Sheet 3 5 0 2V NOTE Temporarily move both scope leads to J503 for TP x J503 1 2 DRV A DRV B Sheet 3 See Figure 6 1 x U630 15 OVCMP Sheet 3 5V 0517 14 OVREF Sheets 1 3 4 2V 65 Q602 C DP CONTROL Sheet 3 CV Mode CC Mode 0
162. res make certain the problem is in the power supply and not with an associated circuit the GPIB controller for system power supplies or ac input line Without removing the covers you can use the Verification tests in Chapter 2 to determine if the power supply is operating normally Chapter Organization The information in this chapter is organized as follows Topic Information Given Test Equipment Required Equipment required for completing all the tests in this chapter Troubleshooting Procedures A series of flow charts for systematic location of defective boards circuits and components An explanation of the error codes and messages generated during the power on selftest Signature analysis techniques for troubleshooting the digital circuits on the front panel primary and secondary interface circuits Specific paragraphs for e Checking the bias and reference supplies e Troubleshooting the CV CC status annunciators e Troubleshooting the A3 FET board Post Repair Adjustments Calibration and EEPROM initialization procedures required after the replacement of certain critical components Disassembly Procedures Gaining access to and or replacing components Troubleshooting 29 Test Equipment Required Table 3 1 Test Equipment Required Equipment Purpose Recommended Model Logic Probe To check states of data lines Agilent 545A Test Clips To gain access to IC pins AP Products No LTC Amme
163. ror IF Err THEN PRINT Change pass code to the power supply model or zero then restart the program STOP ELSE GOTO Start END IF END IF Start INPUT Select Initialization I or Factory preset replacement F Sel CLEAR SCREEN SELECT UPC Sel CASE Select Initialization GOTO Init eeprom CASE F Select install new factory data GOTO Fact preset CASE ELSE BEEP GOTO Start END SELECT Init eeprom PRINT Initializing EEPROM FOR I 1 TO 45 OUTPUT Ps DIAG EEPR Addr D Length D Init NEXT I GOTO Cal off Figure 3 18 Initialization and Factory Preset Replacement Program Listing Sheet 4 of 6 Troubleshooting 67 1650 1660 1670 1680 1690 1700 1710 1720 1730 1740 1750 1760 1770 1780 1790 1800 1810 1820 1830 1840 1850 1860 1870 1880 1890 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010 2020 2030 2040 2050 2060 Fact_preset CLEAR SCREEN PRINT This program should ONLY be completed if your power supply PRINT EEPROM has been replaced or a component that will effect PRINT the calibration AND the alignment of voltage overvoltage PRINT and current is complete AND unit has passed the performance PRINT test Enter C to continue any other key to abort INPUT Cont prog IF UPC Cont_prog lt gt C THEN GOTO Cal off
164. rrent shunt to A6 output bd Washer choke 90 Replaceable Parts Table 5 3 Main Chassis Replaceable Parts continued Ref Desig Agilent Part No Description MECHANICAL PARTS continued 3050 1690 Washer spring choke to bus bar choke to xfmr bus to heat sink transformer to diode block 2190 0034 Washer lock hlcl caps ac input 2190 0586 Washer lock hlcl GPIB connector 3050 0002 Washer flat caps ac input 3050 1690 Washer spring bus bar 2190 0586 Washer lockwasher hlcl A3 FET bd mtg 3050 0893 Washer flat A3 FET bd mtg 1000 0842 Window front panel display MISCELLANEOUS 5080 2148 Chaining cable for power supply link 1252 1488 Quick disconnect mating plug for DIG CNTL connector on rear panel 1252 3698 Quick disconnect mating plug for analog connector on rear panel Quick Start Guide European see 5959 3372 5959 3372 Manual Series 667xA operating 5959 3398 Manual Series 667xA operating 8120 5488 Option 831 12 AWG power cord w o plug 8120 5490 Option 832 4 sq mm power cord w o plug 8120 5545 Option 834 10 AWG cord w o plug 8120 5491 Option 841 12 AWG cord with plug NEMA 6 20P 8120 5489 Option 842 4 sq mm power cord with plug IEC 309 32A 8120 5487 Option 843 12 AWG power cord with plug JIS C8303 8120 5546 Option 844 10 AWG power cord with plug NEMA L6 30P Replaceable Parts 91 Table 5 4 A1 Front Panel Board Replaceable Parts Re
165. s General Considerations Procedures are given for programming these tests either from the front panel keypad or from a GPIB controller for a GPIB controller for 667xA system supplies The procedures assume you know how to use the front panel keypad or how to program over the GPIB see the Power Supply Operating Manual for more information When using computer controlled tests you may have to consider the relatively slow compared to computer and system voltmeters settling times and slew rates of the power supply Suitable WAIT statements can be inserted into the test program to give the power supply time to respond to the test commands Hazardous voltages may be present at the power supply output during these tests They should be performed only by qualified electronics personnel Programming Parameters Table 2 2 lists the programming voltage and current values for each model You can enter these values either from the front panel or from a controller over the GPIB for system power supplies Table 2 2 Programming Voltage and Current Values Agilent Model Full Scale Max Prog Full Scale Max Prog Max Prog CC Voltage Voltage Current Current Overvoltage Current Agilent 6571A 6671A 8V 8 190V 220A 225 23A 10V 10A Agilent 6572A 6672A 20V 20 475 V 100A 102 375A 24V 10A Agilent 6573A 6673A 35V 35 80V 60A 61 425A 42V 5A Agilent 6574A 6674A 60V 61 425V 35A 35 83A 72V 4A Agilent 6575A 6675A 120V 123 0V 18A 18 5A 144V 2 5A General M
166. shipped with an operating manual see Replaceable Parts Chapter 5 for part numbers that covers the following topics e Options accessories specifications supplementary characteristics output characteristic curve typical output impedance curves Connecting the power cord load and remote sensing Connecting power supplies in series or autoparallel Connecting the remote controller and setting the GPIB address Configuring the digital port for remote inhibit relay link or digital I O operation Connecting the analog port for external voltage programming control Turn on tests including selftest errors and runtime errors Front panel operation SCPI programming an introduction to syntax language dictionary and status register operation Compatibility language programming for operation with Agilent Series 603xA power supplies Replacement of line fuse and conversion of line voltage Calibration procedure front panel and remote Introduction 7 Instrument Identification The power supply is identified by a unique two part serial number such as US36320101 The items in this serial number are explained as follows Item Description US Indicates the country of manufacture where US USA 3643 The year and week of manufacture or last significant design change Add 1960 to the first two digits to determine the year For example 36 1996 The last two digits specify the week of the year 0101 A sequential number assigned to
167. t T300 9100 4908 Transformer bias GPIB U302 5060 2942 Assembly IC and heatsink 1826 0393 IC LM317T U302 U304 5060 3324 Assembly transistor and heatsink 1853 0490 Transistor PNP U304 U305 5060 3325 Assembly IC and heatsink 1826 0393 IC LM317T U305 U306 5060 2943 Assembly IC and heatsink 1826 0527 IC LM337T U306 U307 5060 2948 Assembly IC and heatsink 1826 0122 IC UA7805UC U307 U308 1826 2341 IC voltage sense U309 1990 1351 Optoisolator U310 1858 0047 Transistor array 16P DIP U311 1826 0346 IC op amp 5080 2172 Cable assembly SW 300 Replaceable Parts 99 Table 5 8 A4 AC Input Board Replaceable Parts continued Ref Desig Agilent Part No Description MECHANICAL PARTS 2110 0726 Fuse clip F304 308 401 2110 0870 Fuse clip 13 32 F400 1205 0282 Heatsink U302 306 307 1205 0402 Heatsink U304 305 0590 1397 Nut F400 clips 0515 0070 Screw M4 x 0 7 F400 clips 0515 0981 Screw M4 x 0 7 D400 2190 0009 Washer lock internal F400 clips 2190 0586 Washer lock F400 heatsinks 100 Replaceable Parts Table 5 9 5 Control Board Replaceable Parts Ref Desig Agilent Part Description ELECTRICAL PARTS C501 0160 5422 Capacitor 0 047 20 C502 503 0160 4805 Capacitor 47pF 5 100V C504 0160 5422 Capacitor 0 047 20 C505 0180 4129 Capacitor 1uF 35V C507 509 0160 5422 Capacitor 0 047 20 C510 0160 4801 Capacitor 100pF 596 C512 0160 5422
168. t the output as shown in Figure 2 1B except replace the Electronic Load with the external test supply specified in Table 2 1 Set the external supply to 5 volts and its current limit to the CC value of the power supply under test see Table 2 2 Turn on the power supply under test and program its output voltage to 0 Verification 19 Table 2 5 Constant Current CC Tests continued Action Normal Result Current Sink CC and Readback Accuracy cont Observe the DVM voltage reading Divide this by the resistance of the current monitor resistor to obtain the current sink value Subtract the current value obtained in Step 4 from the current reading on the power supply display Record the difference as the Current Sink Display Readback Value within Current Sink Display Readback limits CC Noise PARD Periodic and random deviations PARD in the output ripple and noise combine to produce a residual ac current superimposed on the dc output current This test measures CC PARD specified as the rms output current over the frequency range of 20 Hz to 20 MHz 1 Turn off the power supply and connect the current monitoring resistor and rms voltmeter see Figure 2 1 Make the test leads as short as possible to reduce noise pickup Measure the residual noise on the RMS voltmeter with the power supply turned off Noise generated by other equipment may affect this measurement and should be remo
169. ter Current Shunt To measure output current Agilent 6571A amp 6671A Guildline 9230 300 Agilent 6572A 75A amp 6672A 75A Guildline 9230 100 Oscilloscope To check waveforms and signal levels Agilent 54504A Signature Analyzer To troubleshoot most of the primary Agilent 5005 A B and secondary interface circuits GPIB Controller To communicate with power supply via Agilent BASIC Series the GPIB for system units DC Voltmeter To measure output voltage and current Agilent 3458A bias and references Troubleshooting Procedures Power On Selftest Description The procedures in the troubleshooting charts make use of the power on selftest The power on selftest tests the front panel GPIB interface for GPIB system power supplies or Isolator Board bench supplies and secondary interface circuits If the power supply fails the selftest the output remains disabled turned off and the front panel normally displays an error code or message see Table 3 2 The message is displayed indefinitely and the power supply will not accept GPIB or front panel commands Disabling The Power On Selftest In order to perform troubleshooting procedures that require programming of the power supply you must disable the power on selftest Do this as follows Turn off the power supply Hold down the key and turn on the supply Continue holding down the for 2 seconds and wait until the PWR ON INIT indicator goes off The power supply is now on witho
170. terface circuits referenced to power supply common The GAL IC also provides a serial I O port to the Al Front Panel Board to enable front panel control of the power supply A serial link interface IC U109 on the A2 GPIB Board allows up to sixteen supplies to be connected together and programmed from one GPIB address The first supply is the only supply connected directly to the GPIB controller and is set to the primary GPIB address The remaining supplies are set to secondary addresses and are linked daisy chained together via the 1 12 phone jacks at the rear of each supply The serial link configuration is described in the Power Supply Operating Manual A digital control interface on the A2 GPIB Board provides the following power supply functions Relay link Digital 1 0 Remote inhibit INH Discrete fault indicator FLT An optical isolator IC U113 isolates the FLT output signal common from the external fault circuit common Principles Of Operation 77 The desired digital interface function is selected by placing a jumper in a header J106 on the A2 GPIB Board Appendix D in the Power Supply Operating Manual describes how to select one of these functions and how to make the appropriate external connections to the DIG CNTL connector on the supply s rear panel Another jumper position on the header selects the SA signature analysis mode which is used for troubleshooting see Chapter 3 The 2 Board has a bias supply regula
171. ternal switch Printing History The edition and current revision of this manual are indicated below Reprints of this manual containing minor corrections and updates may have the same printing date Revised editions are identified by a new printing date A revised edition incorporates all new or corrected material since the previous printing date Changes to the manual occurring between revisions are covered by change sheets shipped with the manual Also if the serial number prefix of your power supply is higher than those listed on the title page of this manual then it may or may not include a change sheet That is because even though the higher serial number prefix indicates a design change the change may not affect the content of the manual Edition 1 October 1993 Edition 2 September 2000 Copyright 1993 2000 Agilent Technologies Inc This document contains proprietary information protected by copyright All rights are reserved No part of this document may be photocopied reproduced or translated into another language without the prior consent of Agilent Technologies Inc The information contained in this document is subject to change without notice Table of Contents 7 SCODe 3 5 S ene dp teed Medi D 7
172. this test you can exit the SA mode only by performing a power on reset 62 Troubleshooting Post Repair Calibration When Required Calibration is required annually and also whenever certain components are replaced If components in any of the circuits listed below are replaced the supply must be recalibrated Note For calibration procedures see Appendix A of the Operating Manual Location Component 5 Control Board CV CC DACs operational amplifiers CV CC control circuit amplifiers readback DAC operational amplifier readback comparators Front Panel Assy A Front Panel Board or EEPROM AIU6 Note If either of these front panel components is replaced the power supply must first be reinitialized before calibration see EEPROM Initialization Inhibit Calibration Jumper If CAL DENIED appears on the display when front panel calibration is attempted or error code 1 occurs when GPIB calibration is attempted on a Systems Supply the INHIBIT CAL jumper see Figure 3 15 is installed This prevents the power supply calibration from being changed To calibrate the power supply first move this jumper from the INHIBIT CAL position to the NORM position Calibration Password In order to enter the calibration mode you must use the correct password as described in Appendix A of the Operating Manual As shipped from the factory the supply s model number e g 6671 is the password If you use an incorrect password PASSWD E
173. tor U121 that provides 5V with respect to earth ground for the primary interface circuits and the bias voltage for the front panel board circuits the LCD and the keypad The A2 Board also has a line or bias voltage detector IC U101 that generates a power clear signal PCLR This signal initializes certain primary interface and front panel circuits when normal ac line voltage is applied and also shuts these circuits down when the line voltage drops below the required minimum A2 Isolator Board Circuits 657xA Series Only The isolator board performs the following two functions 1 Creates a 5V bias voltage 2 Provides isolation between the PCLR RxD and TxD front panel signals and similar signals received from the A1 Main Board When power is turned on to the power supply an isolated AC signal from XFMR in the secondary circuits is applied to a 5V bias supply U805 on the isolator board The bias supply produces a 5V BIAS output voltage that is routed to the front panel circuits At the same time a low SPCLR level from the secondary circuits is applied to optical isolator circuit U800 It is then routed as a low PCLR level to the RESET input of the front panel microprocessor This low level keeps the microprocessor temporarily disabled during power turn on for a short time interval After a delay of 40 ms SPCLR goes high and the microprocessor is enabled By inhibiting microprocessor operation for 40 ms any erroneous
174. ts Agilent Part No Description ELECTRICAL PARTS Not used 9170 1518 Coil toroid Not used 9170 1517 Coil toroid Not used 9170 1512 Coil toroid Not used 1855 0834 MOSFET power 1855 1003 MOSFET Not used 1855 0834 MOSFET power 1855 1003 MOSFET Not used 1855 1003 MOSFET Not used 1853 0510 Transistor PNP 0757 0489 Resistor 10 5 0 25W 0683 0475 Resistor 4 7 5 0 25W 06671 20001 Shunt current 250A 06672 20001 06673 20001 06674 20001 06675 20001 0683 2755 0698 3311 0698 3630 0764 0016 0683 2755 0698 3646 Shunt current 125A Shunt current 75A Shunt current 50 Shunt current 20A Resistor 2 7M 5 0 25W Resistor 51 5 2W MO Resistor 300 5 2W Resistor 1K 5 2W Mo Resistor 3K 5 2W Mo Resistor 12K 5 2W Mo Table 5 10 A6 output Filter Board Replaceable Parts continued Ref Desig R910 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A R911 Model specific 6571A 6671A 6572A 6672A 6573A 6673A 6574A 6674A 6575A 6675A R912 Model specific 6571A 6671A 6572A 6672A 6573A 6575A 6673A 6675A R915 Model specific 6571A 6574A 6671A 6674A 6575A 6675A R916 R917 Model specific 6571A 6671A 6572A 6672A 6573 6673A 6574 6674A 6575A 6675 R933 Model specific 6571A 6671A 6572A 6672A 6573A 6575A 6673A 6675A R934 Model specific 6571A 6574A 6671A 6674A 6575A 6675A R935 Model s
175. u 6 4mV _ mV Vou 6 4mV 230 Source Effect Vou 64mV _ mV Vou 6 4mV 230 PARD Ripple and Noise Peak to Peak _ 16mV 1mV RMS _ mV 1 9mV 150 Transient Response Time 0 _ my 100mV 12mV at 900 us Constant Current Tests Current Programming and Readback Low Current OA Ij 12mA _ MA 12mA 151uA Front Panel Display Readback Tout 18mA MA La 18mA 151uA High Current 18A Iou 17 97 A A 18 03A 2 4mA Front Panel Display Readback Tout 36mA _ MA Tout 36mA 2 4mA Current Sink 2 5A Display 430uA Readback Liu 20 5mA mA Link 20 5mMA PARD Ripple and Noise mA 12mA 5mA RMS Load Effect Tou 19mA mA Tour 1 9mA 15 Source Effect Tou 1 9mA mA Tou 1 9mA 15 Enter your test results in this column 28 Verification Troubleshooting Shock Hazard Most of the procedures in this chapter must be performed with power applied and protective covers removed These procedures should be done only by trained service personnel aware of the hazard from electrical shock This instrument uses components that can be damaged or suffer serious performance degradation due to CAUTION ESD electrostatic discharge Observe standard antistatic precautions to avoid damage to the components see Chapter 1 Introduction Localizing the Problem This chapter provides troubleshooting and repair information for the power supply Before beginning troubleshooting procedu
176. um Measurement Spec t Spec Uncertainty Constant Voltage Tests Voltage Programming and Readback Low Voltage OV Vout 35mV mV 35mV 2u V Front Panel Display Readback Vout 50mV mV Vout 50mV 2 High Voltage 35V Vou 34 951V V 35 049V 526 Front Panel Display Readback Vout 68mV mV Vou 68mV 526uV Load Effect Vou 19mV mV Vou 1 9mV 27uV Source Effect Vou 19mV mV Vout 1 9mV 27uV PARD Ripple and Noise Peak to Peak 0 mV 9mV 904uV RMS 0 uv 800uV 50uV Transient Response Time 0 mV 100mV 12mV at 900 15 Constant Current Tests Current Programming and Readback Low Current Ij 40mA MA 40mA 154 Front Panel Display Readback Tour 60mA MA Tout 60mA 154 High Current 60A Iou 59 9A A 60 1A 15mA Front Panel Display Readback Tout 120mA _ mA Tout 120mA 15mA Current Sink 5A Display Readback Li 65mA mA 65mA 0 7mA PARD Ripple and Noise mA 40mA 5mA RMS Load Effect Iu 7mA mA Lu 7MA 28uA Source Effect Tou 7mA mA Lu 7MA 28 Enter your test results in this column 26 Verification Table 2 10 Performance Test Record for Agilent Model 6574A or 6674A MODEL Agilent Report No Date Test Description Minimum Results Maximum Measurement Spec 5 Spec Uncertainty Constant Voltage Tests Voltage Programming and Readback Low Voltage OV Vout 60mV mV 60mV 2 2 Front Panel Display R
177. ut executing power on selftest PA 226 Using the TST Query GPIB Systems Supplies Only You can get the power supply to execute a partial selftest by sending it the GPIB TST query command Table 3 2 shows the tests that are performed in response to this command These tests do not interfere with normal operation or cause the output to change The command returns a value of 0 if all tests pass Otherwise the command returns the error code of the first test that failed No error codes are displayed on the front panel and the power supply will attempt to continue normal operation 30 Troubleshooting Code and or Message Table 3 2 Selftest Error Codes Messages Description Probable Cause Selftest Error Codes Messages El FP RAM E2 FP ROM E3 EE CHKSM E4 PRI XRAM E5 PRI IRAM E6 PRI ROM E7 GPIB E8 SEC RAM E9 SEC ROM E10 SEC 5V E11 TEMP E12 DACS Front panel RAM test failed power on Front panel ROM test failed power on and TST Front panel EEPROM checksum test failed power on and TST Primary interface external RAM test failed power on Primary interface internal RAM test failed power on Primary interface ROM test failed power on and TST GPIB interface test failed power on Secondary interface RAM test failed power on Secondary interface ROM test failed power on and TST Secondary interface 5 volt readback test failed power on and TST Ambie
178. ved or factored out Turn on the power supply and program the current to its full scale value and the voltage to its maximum programmable value see Table 2 2 Adjust the load in the CV mode for full scale voltage see Table 2 2 as shown on the front panel display Observe the reading on the rms voltmeter Divide this voltage by the resistance of the current monitoring resistor to obtain the rms noise current The power supply output current should be at its full scale value and the CC annunciator on If it is not adjust the load to slightly reduce the output voltage until the annunciator comes on Current is within the specified PARD rms limits CC Load Effect This test measures the change in output current resulting from a change in load from full load voltage to a short circuit It is recommended that you use averaged readings for Steps 4 and 5 of this test see Averaging AC Measurements at the end of this chapter 1 Turn off the power supply and connect a DVM across the current monitoring resistor see Figure 2 1 Turn on the power supply and program the current to its full scale value and the voltage to its maximum programmable value see Table 2 2 Set the Electronic Load to CV mode and its voltage to full scale as indicated on its front panel display Power supply output current is full scale and its CC annunciator is on If not reduce the Electronic Load voltage slightly until the annunciator
179. ven when an actual failure does not occur When working on the power supply observe all standard antistatic work practices These include but are not limited to Working at a static free station such as a table covered with static dissipative laminate or with a conductive table mat Agilent P N 9300 0797 or equivalent Using a conductive wrist strap such as Agilent P N 9300 0969 or 9300 0970 Grounding all metal equipment at the station to a single common ground Connecting low impedance test equipment to static sensitive components only when those components have power applied to them Removing power from the power supply before removing or installing printed circuit boards Introduction 9 Verification Introduction This chapter provides test procedures for checking the operation of Agilent Series 667xA GPIB system and 657xA programmable bench power supplies The required test equipment is specified and sample performance test record sheets are included Instructions are given for performing the tests either from the front panel or from a controller over the GPIB for system units Tests Two types of procedures are provided Operation Verification tests and Performance tests Type of Test Purpose Operation Verification These tests do not check all parameters but comprise a short procedure to verify that the power supply is performing properly Performance These tests verify all the Specifications not Supplementary Char
180. vete eere tin 19 Index 163 constant voltage mode uuu woes Gt reat N EE tet tecta d eie edere 19 independent order ettet bab A ei tbe bee epe 19 operation verification De De ORCI D i 15 a 15 programming seed ubme Uo TV ere UE bee N EU bande serene 15 Tests performance test record u toic ERU ann eR E FEE Er EFE Are 27 TORK SCre RR 72 transformer variable voltage e eet tee ER eec 16 transient recovery Ime epe ee Bele elie eem 16 Troubleshooting test points ertet e eir ERE EC RR RU T ER DURER RT En SEERE is ini 125 troubleshooting chart outp t held ERRARE SERT to UU E tu 47 OVAL eee ORCI RO RIPE GRE RU WR GERI ET REI OV ETE 43 secondary downprogrammng perterriti ghe ete Ee E ETHER de Ca oe ERIS Eee eo he 56 troubleshooting charts ore lee ntencdetaue m i iie 37 WES DE aia tees EA e eint 34 quer E AG EE GE A mede REPRISE 34 U UNREGULATED ann nciatot mI tee tee ed dee eh eee ee Es 57 USING LONE SEE 12 V voltage maximum programmable cete e rette teer i de iecit ede e 17 164 Index
181. w 0515 FAN_SENSE 047 AMB_SENSE 50V 18 VE V LPZ65 511 16 13 PM 7545 20 R521 DB11 RFB DB10 DBS NZ 150 DB8 711 6 P O OUTPUT BD CONNECTOR 085 OUT1 DB4 AGND 085 DGND DB2 0502 DB1 047 lt 7 51 5 Hs UREF 19 SUCCESSIVE APPROXIMATION A D UFSC URG 150 NOTE AN ASTERISK NEXT TO A RESISTOR OR CAPACITOR INDICATES THE COMPONENT VALUE CHANGES WITH 0555 C556 OUTPUT VOLTAGE RATING 38 0 1 1 THE VALUES SHOWN ON THE SCHEMATIC ARE FOR THE 500 35V 60V MODEL THE VALUES FOR ALL OTHER MODELS ARE GIVEN IN TRBLE 5 9 Figure 6 12 A5 Board Sec amp CV CC Readback DACs Schematic sheet 1 DO NOT LOAD C703 C 01 50 REF I sov vos gt L R702 C670 R807 J 1M R802 130K R804 130K LF412 4 Es RB809 150 46 15K si n CC CLAMP AMP T 50V C671 STATUS COMP R892 15U R805 25K 054 C720 1 104 1 50V 11 ARATORS gt 150 e 4 5U REF Wer Hil R212 3 16M 1 J L A L paje ope rope eio afr III 10 615 8 0685 204 846 750626 5 62 it 2 VIL L L A Le C893 11013 10 L 800 15 ise pore CU ERROR UCU R715 AMP 0350 4 99 500 0218 R785 HL VJ 15V 182K LOAD LORD R771 C721 0288 UF_SEN TU 0 1 EL 500 500 068355
182. which are designated by Agilent Technologies for use with a hardware product and when properly installed on that hardware product are warranted not to fail to execute their programming instructions due to defects in material and workmanship for a period of 90 days from date of delivery During the warranty period Agilent Technologies will at its option either repair or replace products which prove to be defective Agilent Technologies does not warrant that the operation of the software firmware or hardware shall be uninterrupted or error free For warranty service with the exception of warranty options this product must be returned to a service facility designated by Agilent Technologies Customer shall prepay shipping charges by and shall pay all duty and taxes for products returned to Agilent Technologies for warranty service Except for products returned to Customer from another country Agilent Technologies shall pay for return of products to Customer Warranty services outside the country of initial purchase are included in Agilent Technologies product price only if Customer pays Agilent Technologies international prices defined as destination local currency price or U S or Geneva Export price If Agilent Technologies is unable within a reasonable time to repair or replace any product to condition as warranted the Customer shall be entitled to a refund of the purchase price upon return of the product to Agilent Technologies LIMITAT

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