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1、NAD SERVICE MANUAL T 761 SURROUND SOUND RECEIVER T 761 SURROUND SOUND RECEIVER RadioFans.CN 收音机爱 好者资料库 2 SERVICE SAFETY PRECAUTIONS 1.Replacing the fuses CAUTION: FOR CONTINUED PROTECTION AGAINST THE RISK OF FIRE REPLACE ONLY WITH SAME TYPE OF FUSE. Reference NoPart NumberDescription M752 *C 5120-00
2、17-0FU T4A 250V SEMKO/UDE HBC M754 *C 5120-0018-0FU T1A 250V SEMKO/UDE 5X20MM M751 *AH 5120-0040-0FU T6.3A 250V 5X20 UL M754 *AH 5120-0052-0FUSE T1.6A 250V 5X20MM NOTE: : USA, CANADIAN MODEL ONLY. : EUROPEAN MODEL ONLY. 2.Safety check out (Only U.S.A. model) Before returning the product to the custo
3、mer, make leakage current or resistance measurements to determine that exposed parts are acceptably insulated from the supply circuit. Parts marked with the symbol are critical with regard to the risk of fire and electric shock. Replace only with parts recommended by the manufacturer. CONTENTS DESCR
4、IPTIONPAGE SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4 REAR PANEL / FRONT PANEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 DISASSEMBLY INSTRUCTIONS . . . .
5、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-8 BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6、 . . . . . . . . . . . . . . . . . . . . . . . . . .9 ADJUSTMENT POINTS DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 INSTRUMENT SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
7、 ALIGNMENT PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-12 IMPORTANT NOTES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 PCB LAYOUT . . . . . . . . . . . . . . . . . . .
8、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14-25 SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26-44 IC BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9、 . . . . . . . . . . . . . . . .45-52 ELECTRICAL PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53-75 EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76 EXPLO
10、DED VIEW PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77-78 PACKING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79 RadioFans.CN 收音机爱 好者资料库 3 SPECIFICATIONS POWER AMPLIFIE
11、R AND PREAMPLIFIER SECTION Rated distortion(THD 20Hz-20 kHz FL/C/FR) 0.08% (THD 20Hz-20 kHz SL/SR) 0.3% Input Sensitivity(ref. 8 ohms, 1 kHz)180+/-30 mV S/N Ratio(A-wtd, 1KHz, 1W, 8 ohm) -75 dB (A-wtd, 1KHz, 80W, 8 ohm)FL/FR/C 92 dB SL/SR -90 dB Frequency Response(20 Hz - 20 kHz)0 0.8 dB Channel Bal
12、ance(1 dB to -40 dB, 1 kHz) 2 dB (-41 dB to -50 dB, 1 kHz) 3 dB Audio muting at 1kHz 53 dB Headphone O/P in 0.1%, 600 ohm load, CD in 500mV, 1 kHz 10V Subwoofer out, 500mV in(THD at 2V O/P, 100 Hz) 0.5% (S/N at 2V O/P, 100 Hz) 80 dB Crosstalk(2V input, 10W, 1 kHz) -68 dB Continuous average power out
13、put (L/R/C RL/RR 8ohms)80 W Controls Bass(at 500mV in, 1W out, 100 Hz) 9 dB Treble(at 500mV in, 1W out, 10 kHz) 9 dB SURROUND SECTION Channel separation I/p mode : L, R: 1V in, 1 kHz, Ch R, L 45 dB : o/p at unexpected, 1 kHz, Ch C 35 dB I/p mode : L= -R: 1V in, 1 kHz, Ch R, L 28 dB : o/p at unexpect
14、ed, 1 kHz, Ch C 30 dB I/p mode : L= R: 1V in, 1 kHz, Ch R, L 45 dB : o/p at unexpected, 1 kHz, Ch SL, SR 30 dB Frequency Response I/p mode : L, R: 1V in, 1W, Ch R, L40Hz0 1.5 dB 20kHz0 0.8 dB I/p mode : L= R: 1V in, 1W, Ch C300Hz0 0.8 dB 20kHz0 0.8 dB I/p mode : L= -R: 1V in, 1W, Ch SL, SR30Hz0 1.0
15、dB 6.5kHz-3 1.0 dB S/N Ratio ( 200mV in, 1, A-WTD w/ 1k termination) I/p mode : L, R: 1 kHz, Ch L, R 65 dB I/p mode : L=R: 1 kHz, Ch C 65 dB I/p mode : L=-R: 1 kHz, Ch SL, SR 65 dB THD (2.2V in, 1W, w/ 80 kHz LPF, 1 kHz) 0.2% AC-3/DTS SECTION Frequency Response FL, FR, C, SL, SR:200Hz0 0.8 dB 20kHz0
16、 0.8 dB Distortion 1W all channels0.08% S/N 1 W ( CCIR/ARM, 200 Hz NOTCH & 400 Hz HPF) 85 dB RadioFans.CN 收音机爱 好者资料库 4 AM TUNER SECTION Input level is expressed as the reading in open-circuit of 75-ohm source impedance signal generator Usable sensitivity (999/1000kHz) 30 dB S/N Ratio (5mV in) 38 dB
17、THD (5mV in) 3% IF Rejection (450 kHz) 36 dB Image Rejection (F+2xIF) 28 dB Selectivity 17 dB Output130+/- 20mV Loop sensitivity (20dB S/N) 999/1000 kHz 66 dB 603/600 kHz 66 dB 1404/1400 kHz 66 dB Frequency response (100 - 2.3 kHz, 5mV) 6 dB FM TUNER SECTION*C*AH Input level is expressed as the read
18、ing in open-circuit of 75-ohm source impedance signal generator Usable Sensitivity ( 98 MHz) 15 dB 15 dB Signal / Noise RatioMono 72 dB 72 dB (60 dB, IHF wtd)Stereo 66 dB 66 dB Frequency Response (20 Hz - 15 kHz, 60 dB)0 1.5 dB0 1.5 dB Channel Separation (60 dB)100 Hz 30 dB 30dB 1 kHz 38 dB 38 dB 10
19、 kHz 30 dB 30 dB Alternate Channel Selectivity (40 dB, 400 kHz) 60 dB 45 dB Capture Ratio (40 dB) 3 dB 3 dB AM Suppression (60 dB, 100% Mod.FM, 30% Mod.AM) 48 dB 48 dB Image Rejection (119.4 MHz) 85 db 40 dB I.F. Rejection ( 10.7 MHz) 78 dB 65 dB Pilot Suppression (60 dB) 60 dB 60 dB THD (60 dB, L=R
20、 75 kHz for AH, 40 kHz Dev for C) Mono 0.25% 0.25% Stereo 0.35% 0.35% Auto-Search SensitivityOn 24 dB 24 dB Off 15 dB 15 dB RDS decode Sensitivity 26 dB 26 dB POWER RATING EUROPEAN Model*CAC 230V 50Hz 2.0A USA, CANADIAN Model*AHAC 120V 60Hz 4.2A PHYSICAL SPECIFICATIONS Dimensions (Width x Height x D
21、epth)435 x 131 x 348mm Net weight14kg (31 lbs) Shipping weight16.7kg (37 lbs) 5 1617 1. FM & AM ANTENNA 2. TAPE 1 & CD INPUTS 3. DISC INPUT 4. VIDEO 1 - VIDEO 4 (AUDIO & VIDEO) 5. 5.1 CHANNEL INPUT 6. DIGITAL AUDIO INPUTS / OUTPUTS 7. AUDIO PRE OUTS 8. COMPONENT VIDEO INPUT & OUTPUT 9. MONITOR OUT 1
22、0. SPEAKERS A: FRONT, CENTER & SURROUND SPEAKERS 11. SPEAKERS B 12. SOFT CLIPPING 13. NAD-LINK INPUT / OUTPUT 14. 12V TRIGGER INPUT / OUTPUT 15. SWITCHED POWER OUTLETS 16. AC POWER CORD 17. COOLING FAN 1. POWER 2. STAND-BY 3. DISPLAY 4. AM/FM 5. FM MUTE / MODE 6. MEMORY 7. PRESET / TUNE 8. DOWN / UP
23、AND 9. VFL DISPLAY 10. VOLUME & SETUP 11. HEADPHONE SOCKET & VIDEO 5 INPUT 12. SPEAKERS A & B 13. AUDIO & VIDEO INPUT SELECTORS 14. TAPE MONITOR 15. DIGITAL AUDIO SELECTOR 16. EXT. 5.1 17. SURROUND MODE 18. LEVELS 19. TONE CONTROLS & TONE DEFEAT 13191415161718 REAR PANEL / FRONT PANEL REAR PANEL FRO
24、NT PANEL 6 DISASSEMBLY INSTRUCTIONS 1. Remove machine screws M 4.0 x 6.0 ( 1 to 6 ) from the side panels. Remove tapping screw 3.0 x 8.5 ( 7 )from the back panel. Refer to Figure No.1. Figure No.1 2. Pull both sides of the TOP COVER slightly outwards 8 and tilt approx. 35 and then remove in the dire
25、ction as indicated by the arrow 9 . Refer to Figure No.2. Figure No.2. 7 6 5 1 3 2 4 9 8 8 87 WIRING DIAGRAM J402A RL-B FR-B J803A J402B J803B COMPONENT VIDEO PCB C834 J605B J802BJ101B DIGITAL IN PCB NOTES : SHOWN THE WAFERS SHOWN THE SOLDER END OF HARNESS SHOWN THE PIN 1 OF WIRE HARNESS 7706-1220-1
26、004 7702-1060-2004 7010-1660-1(J206C) 7712-1150-3004 7703-1090-2004 7703-1480-2004 7710-1200-3004 7711-1320-2004 7710-1100-3004 7708-1150-3004 7706-1100-2004 7012-5050-0(J203C) 7703-1360-2004 7704-1200-2004 LN 7703-1430-2004 7012-5030-0(J101C) 7706-1220-1004 7706-1480-3004 7712-1400-2004 7012-5040-0
27、(J604C) 7706-1480-3004 POWER CORD 1681-0060-D 1681-0010-D 1681-0010-D 1681-0010-D AC OUTLET PCB J102BJ701B J901A DIGITAL PCB OUT J503B J801B SPEAKER PCB J7001 J401B J709AJ710A J901B J708A J703A J708B J704A J706AJ705A J206B J502B J701A J701B MAIN PCB J711AJ707A J703B J704B TUNER PCB AUDIO PCB J711BJ7
28、07B VIDEO PCB J709BJ710B S-VIDEO PCB J705BJ706B J602A J601A J603A MULTI CHANNEL PCB SWITCH PCB J208B J206A J207A J204A J203A J201AJ202A KEYBOARD J207B VOL PCB J208A POWER LED PCB J201B P751 P752 P753 P754 PSU PCB J401A VIDEO 5 PCB J202B J701AJ702A J501B SECONDARY PCB PRIMARY PCB J505B J502A J802B J5
29、03A J501A J504A J603B FRONT AMP PCB J604B J802A J801A SURROUND AMP PCB J204B J702B J504B LOAD PCB J203B J101A J601B J604B J102A AC3 PCB 910 BLOCK DIAGRAM COAXIAL x3 OPTICAL x2 4053 74LS157 M62446FP COAXIAL Digital out Com-Video Trigger IN POWER DOWN Detect Pin. For SPK off, Mute ON, VFD off. SPK. A
30、and B Trigger out ADJUSTMENT POINTS DIAGRAM 1. TUNER 2. IDLE CURRENT - Front Amplifier & Surround Amplifier Board RFOSC VT 11 ALIGNMENT PROCEDURES AMPLIFIER SECTION Idle Current StepItemConnectionAdjustment Adjust for 1Front Left ChannelVoltmeter to P502 on Front Amp BoardR5742mV0.2mV 2Front Right C
31、hannelVoltmeter to P501 on Front Amp BoardR5732mV0.2mV 3Center ChannelVoltmeter to P503 on Front Amp BoardR5992mV0.2mV 4Rear Left ChannelVoltmeter to JP801 on Surround Amplifier BoardR8672mV0.2mV (PCB N0901C-AMP2) 5Rear Right ChannelVoltmeter to JP802 on Surround Amplifier BoardR8682mV0.2mV (PCB N09
32、1C-AMP2) INSTRUMENT SETUP 1. FM MEASUREMENT Fig. 1 Fig. 2 2. RDS MEASUREMENT Fig. 3 3. AM MEASUREMENT Fig. 4 FM SIGNAL GENERATOR ANTENNA TERMINAL OUTPUT TERMINAL DISTORTION ANALYZER DISTORTION ANALYZER AC VOLTMETER OSCILLOSCOPE AC VOLTMETER OR OSCILLOSCOPE AC VOLTMETER OR OSCILLOSCOPE OUTPUT TERMINA
33、L OUTPUT TERMINAL L R ANTENNA TERMINAL ANTENNA TERMINAL ANTENNA TERMINAL AM LOOP ANTENNA (Accessory) AM LOOP ANTENNA 60cm DIGITAL MILLIVOLT METER VT-J914 FM SIGNAL GENERATOR AM SIGNAL GENERATOR FM SIGNAL GENERATOR RDS GENERATOR FM STEREO GENERATOR P-901 DC MILLIVOLT METER UNIT UNIT UNIT UNIT 12 FM/R
34、DS SECTION - FM mono:1kHz, 75kHz devi., 60dB/V - FM stereo:1kHz, 67.5kHz devi., 60dB/V Pilot signal 19kHz 7.5kHz devi. OUTPUTS - Connect the non-inductive type resistor of 8 ohms to the all speaker terminals unless otherwise noted. Item FM IF/RF Stereo Distortion Stereo Separation Muting Level Signa
35、l output Step 1DC voltmeterL9410100mV 3 Distortion analyzer Distortion analyzer Oscilloscope Oscilloscope L942 R956 R941 Minimum Minimum 2AC voltmeter IFT on the front end IFT on the front end Maximum Maximum separation Connection of instrument Fig.1 Fig.2 Fig.2 Fig.1 Channel L or R 1kHz 99.0MHz 1kH
36、z 75kHz devi. 65dBf (60dB) 99.0MHz Ext. mod. 65dBf (60dB) FM SG output Stereo mod- ulator output Tuning frequency 99.0MHz 99.0MHz Channel L or R 1kHz 99.0MHz Ext. mod. 65dBf (60dB) 99.0MHz Ext. mod.65dBf(60dB) RDS 2% MOD 99.0MHz 18dB 99.0MHz 99.0MHz RDS Fig.399.0MHz Output indicator Adjustment point
37、 Adjust for Remarks FM MUTE/MODE switch: ON/AUTO Repeat the steps 1 to 3 until no fur- ther adjustment is necessary. FM MUTE/MODE switch: ON/AUTO Dont turn more than +/-180 Repeat stereo distortion and stereo separation alignment until THD at minimum and separation at maximum. Decode the RDS- Progra
38、m Station. AM SECTION AM Modulation:400Hz, 30% For AH Version Step 1 2 3 530kHz 600kHz 990kHz 600kHz 400Hz 30% mod. 60dB/m AM SG output Tuning frequency Output indicator Adjustment point 600kHz 400Hz 30% mod. 60dB/m AC voltmeter AC voltmeter Digital DC voltmeter L972 OSC coil on RF block L971 RF coi
39、l on RF block L971 Adjust for 1.350.2V Maximum Maximum Step 1 2 3 522kHz or 531kHz 603kHz 999kHz 600kHz 400Hz 30% mod. 60dB/m AM SG output Tuning frequency Output indicator Adjustment point 600kHz 400Hz 30% mod. 60dB/m AC voltmeter AC voltmeter Digital DC voltmeter L972 OSC coil on RF block L971 RF
40、coil on RF block L971 Adjust for 1.30.2V (522kHz) 1.350.2V (531kHz) Maximum Maximum For C Version 13 IMPORTANT NOTES 1. Show the software version Press “TUNE UP” and “TAPE MONITOR”. 2. Toggle between PAL and NTSC Press “MEMORY” and “SPEAKER A”. 3. Light up all the icon on the VFL. Press “FM/MUTE” an
41、d “SPEAKER B”. 4. Toggle between 9K and 10K Press “FM/MUTE” and “Digital Audio Selector”. 5. Clear all tuner presets Change the setting of 9KHz / 10KHz Step. 14 PCB LAYOUT SPEAKER BOARD PRIMARY BOARD LED BOARD SECONDARY BOARD AC OUTLET BOARD 15 DIGITAL IN BOARD S-VIDEO BOARD DIGITAL OUT BOARD 16 PSU
42、 BOARD COMPONENT VIDEO BOARD 17 LOAD BOARD VOLUME BOARD (Top View)(Bottom View) SURROUND AMP BOARD VIDEO 5 BOARD 18 AC3 BOARD - COMPONENT SIDE 19 AC3 BOARD - SOLDER SIDE 20 FRONT AMP BOARD 2221 KEY BOARD - COMPONENT SIDE KEY BOARD - SOLDER SIDE 2324 MAIN BOARDVIDEO BOARDMULTI-CHANNEL BOARD AUDIO BOA
43、RD POWER SWITCH BOARD 26 TO MAIN BOARD J707A TO MAIN BOARD J711A SCHEMATIC DIAGRAM AUDIO NOTE: 1. RESISTORS, ARE CARBON FILM 5% 1/8W UNLESS OTHERWISE SPECIFIED. 2. CERAMIC CAPACITORS, ARE 50V 10%. UNLESS OTHERWISE SPECIFIED. 25 TUNER BOARD 2827 KEYBOARD LED PCB M301 VOLUME PCB NOTE: 1. RESISTORS, AR
44、E CARBON FILM 5% 1/8W UNLESS OTHERWISE SPECIFIED. 2. CERAMIC CAPACITORS, ARE 50V 10%. UNLESS OTHERWISE SPECIFIED. 3029 AC3 / DTS NOTE: 1. RESISTORS, ARE CARBON FILM 5% 1/10W UNLESS OTHERWISE SPECIFIED. 2. CERAMIC CAPACITORS, ARE 50V 10%. UNLESS OTHERWISE SPECIFIED. 3231 (TO FRONT AMP J603B) MULTI-CH
45、ANNEL NOTE: 1. RESISTORS, ARE CARBON FILM 5% 1/8W UNLESS OTHERWISE SPECIFIED. 2. CERAMIC CAPACITORS, ARE 50V 10%. UNLESS OTHERWISE SPECIFIED. 3433 (MF) (MF) (MF) (MF) (MF) (MF) (MF) (MF) (MF) (MF) (MF) (MF)(MF) (MF) (MF) (MF) (MF) (MF) (MF) (MF) (MF) ! ! FRONT AMPLIFIER NOTE: 1. RESISTORS ARE CARBON
46、 FILM 5%1/8W UNLESS OTHERWISE SPECIFIED. MF - METAL FILM 2. CERAMIC CAPACITORS ARE 50V 10%. UNLESS OTHERWISE SPECIFIED. 3. COMPONENTS MARKED “” ARE SAFETY CRITICAL PARTS. 3635 S-VIDEO / VIDEO NOTE: 1. RESISTORS ARE CARBON FILM 5%1/8W UNLESS OTHERWISE SPECIFIED. 2. CERAMIC CAPACITORS ARE 50V 10%. UNL
47、ESS OTHERWISE SPECIFIED. 3837 (TO MAIN J703A) M903 SFE10.7mA5 TUNER NOTE: 1. RESISTORS, ARE CARBON FILM 5% 1/8W UNLESS OTHERWISE SPECIFIED. 2. CERAMIC CAPACITORS, ARE 50V 10%. UNLESS OTHERWISE SPECIFIED. 4039 MAIN BOARD / VIDEO 5 (TO AC3 J604B) (TO VIDEO J708B) (TO Front Amp J502A) (TO Front Amp J70
48、1A) NOTE: 1. RESISTORS, ARE CARBON FILM 5% 1/8W UNLESS OTHERWISE SPECIFIED. MF-METAL FILM 2. CERAMIC CAPACITORS, ARE 50V 10%. UNLESS OTHERWISE SPECIFIED. 41 SURROUND AMPLIFIER (TO FRONT AMP J802B) (TO MULTI J602A) NOTE: 1. RESISTORS ARE CARBON FILM 5%1/8W UNLESS OTHERWISE SPECIFIED. MF - METAL FILM
49、2. CERAMIC CAPACITORS ARE 50V 10%. UNLESS OTHERWISE SPECIFIED. 3. COMPONENTS MARKED “” ARE SAFETY CRITICAL PARTS. 42 (TO SurrAMP C834) (TO FRONT AMP J501A) (MF) STANDBY & SECONDARY NOTE: 1. RESISTORS ARE CARBON FILM 5% 1/8W UNLESS OTHERWISE SPECIFIED. MF - METAL FILM 2. CERAMIC CAPACITORS ARE 50V 10%. UNLESS OTHERWISE SPECIFIED. 3. COMPONENTS MARKED “” ARE SAFETY CRITICAL PARTS. 43 OY Z-COM OE INH VEE VDD Y-COM X-COM OX A B CVSS (TO MAIN J901B) Cr Cb Cr Y Y Cb COMPONENT VIDEO NOTE: 1. RESISTORS ARE CARBON FILM 5% 1/8W UNLESS OTHE
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