Nad-4300-Service
Contents
1. WIRING DIAGRAM A amp A1 Versions 120V AC with AC outlet AM BAR ANTENNA ET f BLU um A RECEPTACLE i POWER CORD if B w SELECTOR P C B Q001A HEISE VOLTAGE SELECTOR 2004 da POWER INDICATOR P C B ROTARY SENSOR P C B 001 POWER SWITCH Hua L ma PRESET SELECTOR 5085 LED DISPLAY P C B D013A WIRING DIAGRAM B1 C amp C1 Versions 220 240V AC less AC outlet AM BAR ANTENNA Tum v IF SELECTOR P C B Q001A JM den oe VOLTAGE SELECTOR 1 7004 L ORN i l m U 5 POWER CORD POWER INDICATOR M108A EEL H oe 1 rx 4 re lm ERAR E i gu FETT LED DISPLAY P C BLD013A PRESET SELECTOR P C B 5085 LAVOUT DIAGRAM FM FRONTEND P C B ASS Y P C B ASS Y 1024A F109A IF B W SELECTOR P C B ASS V Q001A ROTARY SENSOR P C B ASS Y N001A ss nu LED DISPLAY P C B ASS Y 00134 E T aay it i Es mmm i on ml uu Bed fn f 4 6 n 32. de mU N Hi 1 E 1 i fl 1 gt ra 72 2203 0 0 25 PRESET SELECTOR ASS V 5085 VOLTAGE SELECTOR P C B ASS Y 2004 0 0 205 40 A ee a alla m al 16 167160 POWER INDICATOR P C B ASS V SCHEMATIC DIAGRAM NAD 4300 TUNER gt 106 22 ey i CI IA sexney RS 100 H 15 22P 25 929 2 RE SIMIN 2 3 L4 FM 1 437 22 11 438 11 439 11 440 RIJS 620 E 128 Sot 1u L or 1 U a U a U U U ih a LI o o ema m 3K FA7K C404 22 C5 x RAM R407 360 MARK OF RESISTOR 0110 CF404 10 TMLK A 25 212 t z CFAQZ CFA03 0 L x c9 cn sy 1 6 10 i 2 36 134 3 11 040140403 155241 cmm a 5 01 05 15 58 u m MARK OF CAPACITOR x 51018 7 09 ELECT W LEAK AM ANT s Tj gt i Low LE CiS 36 134 m 40 At GT IE FILM 194 6 8K 2160 165 HED H cm 0 0 sp Zin 10n ci u WIDE l H SOV 2 j0 r SO 000 4 O
3. SERVICE MANUAL MONITOR SERIES 200 STEREO TUNER NAD 4300 SERVICE MANUAL NOTE This manual covers all versions A U S A A1 Canada B U K B1 Australia C EUROPE and others C1 W Germanv TABLE OF CONTENTS LOCATION MAP SPECIFICATION INTERNAL VIEW SUGGESTED INSTRUMENTATION HOOKUP FM ALIGNMENTS AM ALIGNMENTS WIRING DIAGRAM P C B LAVOUT DIAGRAM SCHEMATIC DIAGRAM EXPLODED VIEW PARTS LIST EXPLODED VIEW ELECTRICAL PARTS LIST 10 11 12 13 14 15 16 17 18 19 20 21 23 REAR PANEL 1 AM Rod Antenna 5 Output Jacks 2 AM Antenna Terminals 6 AC Convenience Outlet not in U K model 3 FM Antenna Input 7 AC Line Cord SPECIFICATIONS FM Tuner Section 4 Output Level Control 1 All versions except USA USA version only Input sensitivity 300 2 50 usec de emphasis 75 usec Mono 30 dB THD 0 83 uV 0 8 uV Mono 50 dB S N 1 3 uV 1 0 uV Stereo 50 dB S N 14 5 uV 13 uV Mono 60 dB S N 3 2 uV 2 5 uV Stereo 60 dB S N 48 uV 42 uV Capture ratio at 25 45 amp 65 dBf lt 2 1 dB lt 2 1 dB AM rejection gt 70 dB 70 dB AM ANTENNA 7 oo NENIT OAE ETA NAR Selectivity Alternate channel 76 dB 76 dB T es om NAD ELECTRON E Adjacent channel 8 dB 8 dB OUTPUT LEVEL L Image rejection 110 dB 110 dB intermodulation 73 dB 73 rejection 102 dB 102 dB 5 rejection 80 dB 80 d
4. 67 a 5 m od 2 2 on R103 62K x i un T m e 5 C Say R207 TP103 x 5 a 4 A m 2 a 10 b p 2 2 520 16V 36 133 gt 1 1710 30 27 3 UM 133 50 1 1758112 103 tar 22 t30 RISO 33K BE LESS JE SP z 10K x o W L HG 2 3 x a L 2 gt d 1106 ns 8195 174 5 IM R201 220 i R218 560 2 5 E wi 515 7 0107 1 108 12 220 3 3K 2818 15 eu 3 50 2 2 6179 IK 1107 5 3 C180 10n OUT PUT LEVEL o e 10K BX2 169 e C152 Laan 8216 183 amp ODD amp 2M 70P us 817 TE C145 1 5n Fi jz y 10108 u 5 A ATB BICQCIC4A 50 5 C3 SOps T5ys 1 0301 51 5652 R303 306 220 7545 176 C230 3 9K T 50y amp R178 5 8K C146 12 AaS 620 R223 cial 100A 470P IC110 1 706104 7 2581815 718 250 400mA Ao 1257 oa 78 03A R277 47K 0129 212 SOY 10y 017 0119 2354101543 219 1157 2200 309 Lad R30 220 Lu 220 v 33 530 87 L 38V 2541015 259 4705 108 22 z 10
5. 1 2W CARBON RESISTOR ROTARY SENSOR P C B ASSEMBLY EXPLODED VIEW REF NO 36 SYMBOL NO PARTS NO DESCRIPTIONS PI901 PI902 TLP801A PHOTO INTERRUPTER IF BAN SELECTOR P C B ASSEMBLY Q001A EXPLODED VIEW REF NO 37 SYMBOL NO PARTS NO DESCRIPTIONS IC401 7060 INTEGRATED CIRCUIT IC402 LA1222 Q401 25 1815 TRANSISTOR 0401 0403 155241 DIODE R403 41 791 RESISTOR 5 CF401 CF403 19 159 SFE10 7MZ2K A CERAMIC FILTER CF404 19 157 SFE10 7MLK A f 21 SYMBOL NO IC101 IC102 IC103 IC104 1C111 IC105 IC108 IC109 IC110 IC112 113 1 114 115 116 117 118 119 0101 0102 0103 0104 0107 0112 0115 0116 0120 0121 0122 0123 0124 0105 0114 0117 0118 0119 0109 0110 0111 0113 0101 0102 D103 0104 0105 0107 0111 0115 0118 0122 0125 0119 0124 0126 0127 0129 0130 0132 0128 0131 L101 L102 L104 L105 L106 L107 C103 C125 C173 C189 C228 C126 C127 C153 C158 C187 C188 C196 C201 R126 R127 R141 R148 R210 R288 PARTS NO LA1235 LA1222 LA3401 uPC4558C uPC4570C LA1245 TD6104P TC9147BP TC4011BP LB1450 6104 78MO5A 79M12A 78M12A 25C929 25C1815 25 1015 25 0 25K212 15188FM DS442BT KV1226Y GZA11Z GZA36X SRIK 13 533 13 536 1 0 15 167 12 564 13 347 13 348 50V 0 22uF 50V 1uF 36 133 36 134 50V 0 33uF 50V 0 1uF 5 5V 0 047
6. HEAT SINK HEAT SINK RCA CONNECTOR SINGLE ROTARY POTENTIOMETER OUTPUT LEVEL CONTROL FM FRONTEND P C B ASSEMBLY TAPPING SCREW PHILLIPS HEAD 3 x 6 BLK TAPPING SCREW PHILLIPS HEAD 3 x 8 BLK MACHINE SCREW PHILLIPS HEAD 3 x 6 BLK TAPPING SCREW PHILLIPS HEAD 3 x 6 Cr TAPPING SCREW WASHER HEAD 3 x 6 Cr MACHINE SCREW PAN 3x6 Cr MACHINE SCREW S WASHER HEAD 3x 6 Cr MACHINE SCREW WASHER HEAD 3 x 6 Cr MACHINE SCREW PHILLIPS HEAD 3 x 6 TAPPING SCREW PHILLIPS HEAD 3x8 Cr CABINET SCREW WITH WASHER 4 x 6 BLK TAPPING SCREW FLAT HEAD 3x 6 Cr OUTPUT CONTROL NUT HEXAGON 9 11 2 HEXAGON FLANGE NUT 4 7 4 2 HEXAGON NUT 10 14 2 WASHER TOOTHED LOCK B 10 WASHER PLAIN 9 14 0 5 EXPLODED VIEW 20 ELECTRICAL PARTS LIST NOTE This is not a complete electrical parts list POWER INDICATOR P C B ASSEMBLY M108A EXPLODED VIEW REF 32 SYMBOL NO PARTS NO DESCRIPTIONS D909 SLP246B LED GREEN PRESET SELECTOR P C B ASSEMBLY S085A EXPLODED VIEW REF No 33 SYMBOL NO PARTS NO DESCRIPTIONS D901 D908 LN349GPH LED GREEN LED DISPLAY P C B ASSEMBLY D013A EXPLODED VIEW REF NO 34 SYMBOL NO PARTS NO DESCRIPTIONS IC301 TD6301AP INTEGRATED 0301 0302 25 1815 TRANSISTOR Q303 25 1015 LED301 SL 5653 LED INDICATOR D301 D302 LN449 YPH LED AMBER VOLTAGE SELECTOR P C B ASSEMBLY Z004A EXPLODED VIEW REF NO 35 SYMBOL NO PARTS NO DESCRIPTIONS R902 2 7
7. adjust L 5 and L 101 slightly so that the distortion on Left or Right channel becomes minimum Check distortion at stereo operation under wide IF band width SPECIFICATION less than 0 12 stereo L R less than 0 08 stereo L only less than 0 08 stereo R only less than 0 08 stereo L R Next switch IF NARROW button in and check distortion under stereo signal input SPECIFICATION less than 0 8 stereo L only less than 0 8 stereo only less than 0 896 stereo L R Reset IF bandwidth to wide position again and modulate Left channel only Adjust R 141 for minimum output on Right channel VTVM and oscilloscope Next modulate Right channel only and adjust R 141 for minimum output on Left channel VTVM and oscilloscope If the leak outputs on opposite channels are different readjust R 141 so that readings become same in both channels Check and confirm that separation under wide IF bandwidth is within the following specification SPECIFICATION more than 50dB Switch IF NARROW button and modulate Left or Right channel only Adjust R 403 for minimum output on Right or Left channel VTVM and oscilloscope If the leak outputs on opposite channels are different readjust R 403 so that readings become same in both left and right channels Check separation under narrow IF bandwidth and confirm it is within the following specification SPECIFICATION more than 40dB FM NR CIRCUIT Confirm that FM NR b
8. 0301 0122 0129 POWER 105 1 301 0130 SR IK STEREO 4 0201 A AT 206 C C1 220 50 B B1 25 0 5 9290 IK R243 12K 50 0 33 19 205 7 2M LU 8254 100K 8 3 3 LI c232 4 2 a 22n sl 5 gt NOTE ell ou 479 63 1901 J901 A A1 0100 05442 624112 16233 1251 R245 8 2 cigg 8 81 u 250 6 50 0 22 1024 16 17 EXPLODED VIEW PARTS LIST Ref No 0 OO gt 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 29 1 30 31 32 33 33 1 33 2 33 3 34 34 1 35 36 36 1 Parts No 63 6280 0 0 62 1111 0 0 62 1111 1 0 62 3480 0 0 63 5170 0 0 62 1110 0 0 62 1110 1 0 62 2320 0 0 92 2103 0 0 63 1844 0 0 71 2625 0 0 71 2622 0 0 71 2621 0 0 71 2623 0 0 71 2619 0 0 71 2620 0 0 71 1912 0 0 71 3111 0 0 71 3110 0 0 71 1892 0 0 11 5121 0 0 23 1327 0 0 23 1327 3 0 23 1327 2 0 23 1327 1 0 85 258 0 0 85 260 0 0 85 240 0 0 85 259 0 0 85 235 0 0 62 3332 0 0 63 1843 0 0 63 1872 0 0 87 289 0 0 87 3247 0 0 87 3251 0 0 82 2171 0 0 87 3249 0 0 82 2161 0 0 81 2320 0 0 M108A 5085 71 1911 0 0 81 2336 0 0 81 2335 0 0 DO13A SL 5653 2004 001
9. 134 82 2162 82 2174 DESCRIPTIONS TRANSISTOR if i DIODE FM ANTENNA COIL FM RF COIL H H IFT COIL OSC COIL CHOKE COIL 10uH A 0 56uH TRIMMER CAPACITOR 3 11pF ANTENNA CONNECTOR YKV11 0065 A A1 11 0096 NAD ELECTRONICS BOSTON LONDO YANNL 038341 LISA
10. B Een Pilot suppression 19 38 kHz 69 dB 72 dB THE RISK OF ELECTRIC COVER OR BACK THD at 100 modulation IkHz 100Hz 6kHz 1kHz 100Hz 6kHz 2 SERVICING TD UALFIED 5 Mono 0 08 0 15 0 07 0 15 Stereo 0 07 0 35 0 05 0 35 S N ratio A weighted 65 dBf Mono 84 dB 85 dB Stereo 77 dB 78 dB FRONT PANEL Frequency response 15 15 kHz 0 5 dB t 0 5 dB 1 Power 2 a Pre sets NE Stereo separation FM NR off 1 kHz 50 dB 50 dB 3 Memory Enter 9 FM NR Off 30 Hz 15 kHz 35 dB 35 dB 4 Tuning Display 10 Mono 5 FM Stereo indicator 11 Tuning 6 IF Narrow Indicator AM Tuner Section Usable sensitivity 250 u V meter 250 u V meter Monitor Series Stereo Tuner 4300 1611 101 ILC ILI TUNING AM iF FMNR FM STEREO FM NARROW OFF i F NARROW Selectivity Image rejection Physical Specifications Dimensions width x height x depth Net weight Shipping weight Power requirements 55 dB at 9 kHz 45 dB 45 dB 43 5 x 8 7 x 29 3 cm 17 1 x 3 4 x 11 5 in 4 55 Kg 10 Ib 5 75 Kg 12 Ib 10 oz 50 60 Hz at 110 120 220 or 240 VAC 24 W 60 dB at 10 kHz INTERNAL VIEW fu fl 5 IH ki Man ROBIIEND P 77E A al TNT C 2 2 Tees 0 N SUGGESTED INSTRUMENTATION HOOKUP WITH BUILT IN SWEEP IE ST 1000A BBBHHH FREQ COUNTER IF NOT USING YNTHESIZED ETECTOR FM G
11. ENERATOR PROBE DUMMY ANTENNA 750 UNIT UNDER TEST RIGHT OUT DISTORTION METER N DISTORTION INPUT OUTPUT L SCHEMATIC DIAGRAM OF DETECTOR PROBE C1 D2 330p Diodes should be point contact FROM germanium Some commonly TUNER gt available tvpes 1 119 1 60 1 34 1 22 PICTORIAL DIAGRAM OF DETECTOR R1 CENTER LEAD TO PIN 1 IC 102 TO SCOPE Keep leads as shortas possible to minimize stray signal pickup TO TUNER GND AT FRONTEND FM ALIGNMENT NECESSARY INSTRUMENTATION e FM Generator less than 0 0596 THD e Stereo Modulator less than 0 05 THD more than 50dB Sep e Audio Generator not necessay if FM Generator has built in sweep e g SOUND TECHNOLOGY ST 1000A and ST 1020A AC VTVM s or one with a Left Right switch THD Analyzer resolution less than 0 1 Oscilloscope 5mV or better sensitivity X input capability Frequncy Counter VOM or DMM high impedance must read in mV 75 ohm Dummy Antenna IMPORTANT 1 Before alignments commence release IF NARROW and MONO switches out Switch FM NR off in 2 IF FM Generator is not synthesizer type be sure to check its frequency with FREQ counter when adjusting detector and multiplex decoder circuits SYNTHESIZER FREQUENCY 1 Connect Frequency Counter between TP 104 and ground 2 Tune to 98MHz No RF inpu
12. F 36 136 41 788 41 789 41 787 41 791 680 1 4W 22 TUNER P C B ASSEMBLV 1024A EXPLODED VIEW REF NO 38 a DESCRIPTIONS INTEGRATED CIRCUIT TRANSISTOR H IFT FM DETECTOR COIL CHOKE COIL 120uH AM OSC COIL IFT COIL 455 KHz 450KHz MATCHING COIL ELCTROLYTIC CAPACITOR LOW LEAKAGE TRIMMER CAPACITOR 2 7pF 3 11pF ELECTROLYTIC CAPACITOR LOW LEAKAGE MEMORY BACKUP CAPACITOR TRIMMER CAPACITOR 5 2 30pF VARIABLE RESISTOR 10 0 2 i 4 FUSIBLE RESISTOR SYMBOL NO C118 CF101 CF103 CF104 FL101 FL102 FL103 FL104 FL105 XTAL101 CR101 FU101 FU102 FU103 PARTS NO 50V 82pF 19 157 19 140 19 146 19 158 19 152 19 153 19 205 19 156 5TT400 173000 400 173000 0194 DESCRIPTIONS CERAMIC DISC CAPACITOR FK11 COG1H CERAMIC FILTER SFE10 7MLK A SFP450H ANTIBIRDIE FILTER LOW PASS FILTER 19KHz 38KHz ji 10KHz 9KHz CRYSTAL OSCILLATOR 7 2 2 CERAMIC RESONATOR CSB456F11 FUSE 125V 400mA A A1 FUSE 250V 400mA FUSE 125V 500mA A A1 FUSE 250V 500mA B C FM FRONT END P C B ASSEMBLY FJQ9A EXPLODED VIEW REF NO 39 SYMBOL NO Q1 Q2 Q3 Q4 Q5 D1 D5 L1 L2 L3 LA L5 L6 L7 L8 C2 C9 C11 C14 J101 PARTS NO 3SK114V BF982 25 461 25 535 15 55 11 437 11 438 11 439 11 440 13 539 12 565 15 166 15 172 36
13. TLP801 Description FRONT PANEL PUSH BUTTON SELECTORS BLACK PUSH BUTTON ON OFF GREEN PUSH BUTTON FRAME SINGLE HOLE TUNER WINDOW PUSH BUTTON MEMORY BLACK PUSH BUTTON ENTER RED TUNING KNOB FOOT LABEL THIS IS NOT AHANDLE FRONT CHASSIS SIDE CHASSIS L SIDE CHASSIS R SUBCHASSIS FRONT TO REAR SUPPORT REAR PANEL A A1 REAR PANEL B B1 C C1 LED INTERRUPTER CABINET BOTTOM COVER BRACKET OUTPUT LEVEL CONTROL AM BAR ANTENNA POWER TRANSFORMER A POWER TRANSFORMER A1 POWER TRANSFORMER B B1 POWER TRANSFORMER C C1 POWER CORD A POWER CORD A1 POWER CORD B POWER CORD B1 POWER CORD C C1 BUSHING AC POWER CORD AM ANTENNA LABEL CAUTION FOR FUSE A A1 MASKING PLATE TUNING SHAFT HEXAGON STUD P C B SUPPORT AM ANTENNA TERMINAL PLASTIC RIVET RECEPTACLE A A1 POWER SWITCH POWER INDICATOR P C B ASSEMBLY PRESET SELECTOR P C B ASSEMBLY LED GUIDE MEMORY SWITCH BANK 8 SWITCHES ENTER SWITCH LED DISPLAY P C B ASSEMBLY LED INDICATOR VOLTAGE SELECTOR P C B ASSEMBLY ROTARY SENSOR P C B ASSEMBLY PHOTO INTERRUPTER 18 Ref No 37 38 38 1 38 2 38 3 38 4 38 5 39 40 41 42 43 45 46 47 49 50 51 52 53 54 55 56 Parts No QOOTA 1024A 81 2334 0 0 74 3111 0 0 74 3112 0 0 82 2130 0 0 41 689 0 0 FT89A Description IF SELECTOR P C B ASSEMBLY TUNER P C B ASSEMBLY FUNCTION SWITCH BANK 4 SWITCHES
14. Tune to 520 kHz Enter into preset 2 Adjust L 105 for reading of 1 8 0 1 VDC Repeat above steps 2 and 3 until within tolerances ANTENNA IF Swing antenna away from chassis Connect DC voltmeter to centertap R 210 and ground Tune to station of moderate strength near 600 kHz Enter into Preset 3 Adjust L 901 for maximum reading on meter Use non interactive tool such as plastic or wooden stick Adjust L 106 and L 107 for maximum reading on meter Tune to a station of moderate strength near 1400 kHz Enter into Preset 4 Adjust C 153 for maximum reading on meter Repeat above steps 3 and 5 until no further improvement is seen 9 kHz 10 kHz WHISTLE FILTERS Tune to a quiet spot a clear frequency Connect audio oscillator to base Q 112 isolate with 0 1 1 0 capacitor Connect AC VTVM or Scope to R 220 and ground Set audio oscillator to 10 kHz 50 Hz 1 V Adjust FL 104 for minimum meter reading Set audio oscillator to 9 kHz 50 Hz 1 V Adjust FL 105 for minimum meter reading SIGNAL METER Tune to 1 000 kHz and feed 2 5 mV to the antenna terminals Adjust R 210 so that the fifth LED of signal strength meter lights up 1n 2 8 D ir oe P p s T L901 L a f l in a ee Me 22 l 2 3 4 4 A 1 w gw T RI Ld 5 i 4 tl gt D ae ok LF b v p
15. scope Adjust L 5 and L 101 for maximum and symmetrical output curve on the oscilloscope display using as little input as possible D DETECTOR ALIGNMENT 1 6 Disconnect Detector Probe from tuner and Oscilloscope and connect tuner output to the oscilloscope and Distortion Connect DMM across TP 101 and TP 102 Tune to 98MHz and feed 1mV from FM Generator Modulate 1KHz 100 to 75ohm antenna input Adjust L 102 Secondarv for lowest THD SPECIFICATION less than 0 1290 in MONO Adjust L 102 Primarv for OV reading on DMM TOLERANCE 4 5OmV Repeat above steps 4 amp till no further improvements E SIGNAL METER LEVEL 2 Tune to 98MHz and feed from FM Generator to 75ohm antenna input Adjust R 127 so that the second LED of signal strength indicator is just lit up F STEREO SWITCHING THRESHOLD 1 2 Modulate FM Generator 1KHz 100 Left only plus 19KHz pilot 8 10 FM Generator level upwards from 0 and adjust R 126 so that stereo light turns on and audio outputs watched on VTVM s and Oscilloscope switches to one channel only at 54V input level TOLERANCE Note that when turning input level down the unit will switch into mono at a lower level typically 3 5uV G STEREO DISTORTION AND SEPARATION WIDE NARROW IF BANDWIDTH Tune to 98MHz and feed 1 mV from FM Generator to 75ohm antenna input Modulate Left or Right channel only and
16. t needed 3 Adjust C 201 so that the local oscillator frequency shown by the frequency counter reads 108 700MHz TOLERANCE 108 700MHz 4 2KHz B FRONT END ALIGNMENTS Alignment of the front end should only be necessary after repair to the front end or crystal oscillator circuits a TUNING VOLTAGE It is essential to check tuning voltage before aligning the rest of front end 1 Connect DMM between TP 105 and ground 2 Tune to 88MHz and adjust L 6 if the voltage is incorrect TOLERANCE 3 6V 4 0 5V 3 Tune to 108MHz and confirm that the voltage is within the following specification SPECIFICATION 21 25V b TRACKING 1 Connect FM Generator 150KHz sweep 100uV output to 750hm antenna input and Detector Probe to Pin 1 of IC 102 with ground to the tunershield 2 Set tuner to 106MHz entor into Preset 8 and tune the generator so that curve appears on Oscilloscope 3 Adjust C 2 C 9 C 11 and C 14 for maximum curve height on the oscilloscope while reducing RF input to keep entire curve on display 4 Set tuner to 90MHz enter into Preset 1 and tune the generator so that curve appears on the oscilloscope 5 Adjust L 1 L 2 L 3 and L 4 for maximum curve height 6 Repeat above steps 2 3 4 and 5 use Preset 1 and 8 till both frequencies are at maximum curve height C IFADJUSTMENT 1 Set tuner to 98MHz approx the tuner must be tuned to an unoccupied frequency and tune FM Generator to display a curve on Oscillo
17. utton is at OFF position in at first 1 M Tune to 98MHz and feed 1mV with 10096 modulation into 75ohm antenna input and set reference for S N measurement With reference set cancell the stereo modulation and leave pilot tone only Adjust the attenuator of FM Generator so that S N ratio reads 50dB Switch FM NR on and adjust R 148 so that S N is improved by 8dB Switch FM NR off and adjust attenuator of FM Generator so that S N ratio reads 60dB Switch FM NR on and confirm that S N is improved by approx 2dB C9 L3 L6 L2 C11 TP105 L4 LI C2 C14 L5 R127 TP101 TP102 L101 L102s R403 _ R148 UNDER IF KA 4 I ETT z m m cm bh j H MFA E E ne 988 R126 E 1 Fe d 1 m _ Ec X je Li 141 t v 1 m att JA n TED D V E it S i c a P i a amm i Pau fi js 3 d a c t jaw 2 i 24 i uh Ba mE 45 F T i 7 TP404 C201 AM ALIGNMENTS A A s 4 GG e 0 N OSCILLATOR Connect DMM to TP 103 and ground Tune to 1710 kHz Enter into preset 1 Adjust C 158 for reading of 31 0 5 VDC
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