Nad-T-752-Service-Manual(1) 电路图维修手册.pdf

上传人：cc518

文档编号：260562

上传时间：2025-10-13

格式：PDF

页数：63

大小：10.14MB

《Nad-T-752-Service-Manual(1) 电路图维修手册.pdf》由会员分享，可在线阅读，更多相关《Nad-T-752-Service-Manual(1) 电路图维修手册.pdf（63页珍藏版）》请在收音机爱好者资料库上搜索。

1、NAD SERVICE MANUALT 752 T 752 AV SURROUND SOUND RECEIVER AV SURROUND SOUND RECEIVER DRAFT DATE: 08 OCT, 2002RadioFans.CN 收音机爱好者资料库 2 SAFETY INFORMATION RadioFans.CN 收音机爱好者资料库 3 SERVICE SAFETY PRECAUTIONS 1. Replacing the fuses CAUTION: FOR CONTINUED PROTECTION AGAINST THE RISK OF FIRE REPLACE ONLY

2、 WITH SAME TYPE OF FUSE. Reference DesignatorPart NumberDescription F751*AH33-0160001-00-48Fuse 8A 250V Time Lag 5x20 MM UL/CSA F751*C33-0131002-00-48Fuse 5A 250V Time Lag 5x20 MM SEMKO/VDE F752*AH33-0111006 -00-48Fuse 1.6A 250V Time Lag 5x20 MM UL/CSA/VDE/SEMKO F752*C33-0151006 -00-48Fuse 800mA 250

3、V Time Lag 5x20 MM UL/CSA/VDE/SEMKO NOTE: : USA, CANADIAN MODEL ONLY. : EUROPEAN MODEL ONLY. 2. Safety check out (Only U.S.A. model) Before returning the product to the customer, make leakage current or resistance measurements to determine that exposed parts are acceptably insulated from supply circ

4、uit. CONTENTS DESCRIPTIONPAGE SPECIFICATIONS . 4 - 5 REAR PANEL / FRONT PANEL VIEW . 6 DISASSEMBLY INSTRUCTIONS . 7 WIRING DIAGRAM . 8 BLOCK DIAGRAM . 9 ADJUSTMENT POINTS DIAGRAM / AMPLIFIER ADJUSTMENT . 10 PCB LAYOUT. 11 - 23 SCHEMATIC DIAGRAM . 24 - 36 IC BLOCK DIAGRAM. 37 - 45 EXPLODED VIEW . 46

5、EXPLODED VIEW PARTS LIST . 47 - 48 ELECTRICAL PARTS LIST . 49 - 58 PACKING DIAGRAM . 59 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. RadioFans.CN 收音机爱好者资料库 4 SPECIFICATIONS POWER AMPLIFIER SECT

6、ION Rated distortion(Rated power level into 8 ohms, THD 20 Hz-20 kHz FL/C/FR) 0.1 % (Rated power level into 8 ohms, THD 20 Hz-20 kHz SL/SR) 0.1 % Input Sensitivity(ref. 8 ohms, 1 kHz)200 20 mV S/N Ratio(A-wtd, 1kHz, 1 W, 8 ohm, SL/SR) - 80 dB (A-wtd, 1kHz, 80 W, 8 ohm, SL/SR) - 96 dB Frequency Respo

7、nse(20 Hz - 20 kHz)0 0.8 dB Channel Balance(1 dB to -40 dB, 1 kHz) 2 dB (-41 dB to -50 dB, 1 kHz) 3 dB Audio muting at 1 kHz 55 dB Subwoofer out, 500 mV in (THD at 2 V O/P, 100 Hz) 0.5 % Crosstalk(500 mV input, 10 W, 1 kHz) -70 dB Controls Bass(at 500 mV in, 1 W out, 100 Hz) 10 dB 2 dB Treble(at 500

8、 mV in, 1 W out, 10 kHz) 10 dB 2 dB DOLBY DIGITAL SECTION Channel Difference(FL ref. Track 30) 1.2 dB Frequency Response Dolby config.2 SL Track 46 200 - 20 kHz 0.8 dB SR Track 47 200 - 20 kHz 0.8 dB C Track 44 200 - 20 kHz 0.8 dB Harmonic Distortion (1 W, Audio LPF, Dolby Config.1) FL Track 65 997

9、Hz 0.08 % FR Track 67 997 Hz 0.08 % SL Track 68 997 Hz 0.08 % SR Track 69 997 Hz 0.08 % C Track 66 997 Hz 0.08 % S/N Ratio(31 for O/P 1 W, Track 35)CCIR / ARM 65 dB Audio LPF 70 dB A-wtd 70 dB Channel Separation(1 W, 20 kHz LPF)Track 65 997 Hz 75 dB DOLBY PRO LOGIC II SECTION Frequency Resporse I/P

10、mode : L, R: 1 V in, 1 W, Ch L/R40 Hz0 1.5 dB 20 Hz0 0.8 dB I/P mode : L, R: 1 V in, 1 W, Ch C300 Hz0 0.8 dB 20 Hz0 0.8 dB I/P mode : L, R: 1 V in, 1 W, Ch SL/SR40 Hz0 1.5 dB 20 Hz-3 1.0 dB S/N Ratio (200 mV in, 1 W, A-WTD w/ 1 k termination) I/P mode : L, R: 1 kHz, Ch L/R 65 dB I/P mode : L, R: 1 k

11、Hz, Ch C 65 dB I/P mode : L, R: 1 kHz, Ch SL/SR 65 dB THD (2.2 V in, 1 W, w/ 80 kHz LPF, 1 kHz) 0.2 % 5 AM TUNER SECTION Input level is expressed as the reading in open circuit of 75-ohm source impedance signal generator Usable sensitivity(999/1000 kHz) 30 dBuv S/N Ratio(5 mV in) 30 dB THD(5 mV in)

12、3 % IF Rejection(450 kHz) 36 dB Image Rejection(F+2xIF) 28 dB Selectivity 17 dB Output110 20 mV Loop sensitivity(20 dB S/N) 999/1000 kHz 66 dB 603/600 kHz 66 dB 1404/1400 kHz 66 dB Frequency Response(100 - 2.3 kHz, 5 mV) 6 dB FM TUNER SECTION*C*AH Input level is expressed as the reading in open circ

13、uit of 75-ohm source impedance signal generator Usable sensitivity(98 MHz) 15 dBuv 15 dBuv S/N Ratio(60 dB, IHF wtd)Mono 65 dB 65 dB Stereo 60 dB 60 dB Frequency Response(20 Hz - 15 kHz, 60 dBm)0 1.5 dB0 1.5 dB Channel Separation(60 dBm)100 Hz 30 dB 30 dB 1 Hz 35 dB 35 dB 10 Hz 20 dB 25 dB Alternate

14、 Channel Selectivity (40 dBm, 400 kHz) 60 dB 45 dB Capture Ratio(40 dBm) 3 dB 3 dB AM Suppression (60 dBm, 100% Mod. FM, 30% Mod. AM) 40 dB 40 dB Image Rejection(119.4 MHz) 65 dB 65 dB I.F. Rejection(10.7 MHz) 78 dB 65 dB Pilot Suppression(60 dBm) 60 dB 60 dB THD (60 dBm, L=R 75 kHz for AH, 40 kHz D

15、ev for C)Mono 0.8 % 0.8 % Stereo 1 % 1 % Auto-Search SensitivityOn 24 dBuv 24 dBuv Off 15 dBuv 15 dBuv RDS decode Sensitivity 26 dBuv- PHYSICAL SPECIFICATIONS Dimensions (Width x Height x Depth)435 x 133 x 349 mm Net Weight14.40 Kg (31.68 lbs) Shipping Weight16.00 Kg (35.20 lbs) 6 12345 6789 1920111

16、2131415161718 10 23 1 151214 568 11 9 10 16 74 13 FRONT PANEL REAR PANEL / FRONT PANEL VIEW REAR PANEL 1.FM & AM ANTENNA 2.MAIN IN / AUDIO PRE-OUTS / SUBWOOFER OUT 3.MONITOR OUT 4.CD INPUT 5.DISC INPUT 6.IR INPUT & OUTPUT 7.COMPONENT VIDEO IN & COMPONENT VIDEO OUT 8.SOFT CLIPPING ON/OFF 9.SWITCHED P

17、OWER OUTLETS 10.AC POWER CORD 11.DIGITAL AUDIO INPUTS & DIGITAL AUDIO OUTPUT 12.FRONT, CENTER & SURROUND SPEAKERS 13.12V TRIGGER INPUT & OUTPUT 14.VIDEO 1 - VIDEO 5 (AUDIO & VIDEO) 15.TAPE INPUT & OUTPUT 16.7.1 CHANNEL INPUTS 1.POWER 2.STAND-BY 3.AM / FM 4.DISPLAY 5.MEMORY 6.FM MUTE / MONO 7.PRESET

18、DOWN / UP 8.SEARCH DOWN / UP 9.VFL DISPLAY 10.VOLUME 11.VIDEO & AUDIO 12.TAPE MONITOR 13.DIGITAL AUDIO SELECTOR 14.EXT. 7.1 15.SURROUND MODE 16.LEVELS 17.TONE CONTROLS 18.TONE DEFEAT 19.VIDEO 6 INPUT 20.PHONES 7 DISASSEMBLY INSTRUCTIONS 1.Remove machine screws M4.0 x 8.0 (1 to 6) from the side panel

19、s. Remove tapping screw 3.0 x 8.0 (7 to 10) from the back panel. Refer to Figure No. 1. 1 4 5 6 7 8 9 10 2 3 2.Pull both sides of the TOP COVER slightly outwards 11 and tilt approx. 35 and then remove in the direction as indicated by the arrow 12. Refer to Figure No. 2. Figure No. 1 12 11 11 Figure

20、No. 2 82- 0116435- 00- 95 CABLE ASSY 1 WAY #16 UL 1672 BROWN L=400MM CABLE ASSY 3 WAYS #26 UL2877 L=150 82- 0326135- 07- 98 VIDEO 6 INPUT BOARD J721B J709B TO SECONDARY TRANSFORMER TO TRANSFORMER THERMOSTAT TO SECONDARY TRANSFORMER TO PIRMARY TRANSFORMER 82- 1426135- 00- 98 CABLE ASSY 14 WAYS #26 2.

21、5P UL2877 L=420mm SECONDARY BOARD 3.96P UL1015 L=90mm 82- 0818235- 00- 98 J783A J782A J784A J781A POWER SWITCH BOARD A CABLE ASSY 1 WAY #16 UL1672 BLUE L=100 82- 0116436- 12- 95 (FOR AH VESION ONLY) CABLE ASSY 1 WAY #16 UL1672 BROWN L=100mm (FOR AH VESION ONLY) POWER SUPPLY BOARD 82- 0116438- 03- 95

22、 J304B 82- 0826135- 00- 98 82- 0116435- 01- 95 J756 UL 1672 BLUE L=400MM CABLE ASSY 1 WAY #16 CABLE ASSY 8 WAYS #26 2.5P UL2877 L=480mm J758 J758A L J759 N J757 82- 0326135- 03- 98 CABLE ASSY 3 WAYS #26 2.5P UL2854 L=150mm TRIGGER BOARD 2.5P UL2877 L=500mm 82- 1026135- 01- 98 CABLE ASSY 10 WAYS #26

23、82- 0326135- 04- 98 J203A J702A P1.25 L=200mm FFC CABLE 20 PINS 36- 2028201- 71- 92 CABLE ASSY 3 WAYS #26 2.5P UL2877 L=400mm J753B KEYBOARD FFC CABLE 28 PINS 36- 2828201- 71- 92 P1.25 L=200mm J717A J705A CABLE ASSY 8 WAYS #26 2.5P UL2877 L=480mm 82- 0826135- 00- 98 82- 0626135- 03- 98 CABLE ASSY 6

24、WAYS #26 2.5P UL2877 L=480mm W/HOUSING J781B J503BJ722BJ611B J782B J709A CABLE ASSY 12 WAYS #26 82- 1226135- 00- 98 2.5P UL2877 L=240 CABLE ASSY 3 WAYS #26 82- 0326135- 05- 98 MAIN BOARD J721AJ502B J722A 82- 0318235- 00- 98 CABLE ASSY 3 WAYS #18 3.96P UL1015 L=100mm J304A 82- 0226135- 00- 98 CABLE A

25、SSY 2 WAYS #26 UL2877 L=150mm J755A AUDIO BOARD 82- 0326135- 02- 98 J801B J704A J720A J501B J718A J203B FFC CABLE 28 PINS P1.25 L=80mm CABEL ASSY 4 WAYS # 26 2.5P UL2877 L=200mm 82- 0326135- 06- 98 2.5P UL2854 L=250mm 82- 0426135- 00- 98 CABLE ASSY 3 WAYS #26 36- 2828800- 71- 92 J612B CABLE ASSY 12

26、WAYS #26 2.5P UL2877 L=120mm 82- 1224135- 02- 98 J719A J502AJ503A J501A FFC CABLE 20 PINS P1.25 L=120mm CABEL ASSY 6 WAYS #26 2.5P UL1533X1C L=350mm 36- 2028121- 71- 92 82- 0626135- 02- 98 J414B CABLE ASSY 5 WAYS #18 3.96P UL1015 L=250mm FFC CABLE 17 PINS P1.25 L=150mm 82- 0518235- 00- 98 36- 172815

27、1- 71- 92 J414A M504 TO FAN TO THERMISTOR TUNER COMPONENT VIDEO BOARD J1009A J719BJ718B J611A J614B PRE- OUT BOARD J717B 82- 1026135- 06- 98 CABLE ASSY 10 WAYS #26 2.5P UL2877L=50mm MULTI- CHANNEL BOARD FRONT/CENTER AMPLIFIER BOARD S- VIDEO BOARD DIGITAL BOARD DSP BOARD LED BOARD SURROUND AMPLIFIER

28、BOARD VIDEO BOARD WIRING DIAGRAM 8a Part No.DescriptionLocationStartEnd Normal Front and Center Amp Board 82-1224135-02-98CABLE ASSY 12 WAYS AWG=26 2.5P UL2877 L=120mmJ503AFR & C Amp boardSurr Amp Board Normal Surround Amp Board 82-0318235-03-98CABLE ASSY 3 WAYS AWG=18 3.96P UL1007 L=180mmJ504BSurr

29、Amp BoardFR & C Amp board 82-0818235-00-98CABLE ASSY 8 WASY AWG=18 3.96P UL1015 L=90mmJ781BSurr Amp BoardSecondary Board Normal Component Video Board 82-0826135-01-98CABLE ASSY 8 WAYS AWG=26 2.5P UL2877 L=450mmJ414BComponent Video BoardS-Video Board Normal Digital Input Board 82-0426135-02-98CABLE A

30、SSY 4 WAYS AWG=26 2.5P UL2877 L=500mmJ1010ADigital Input BoardDSP Board 82-1226135-03-98CABLE ASSY 12 WAYS AWG=26 2.5P UL1533 L=500mmJ1009ADigital Input BoardDSP Board Normal Keyboard 82-0118435-00-98CABLE ASSY 1 WAY AWG18 UL1007 BLACK L=100mm W/ RING TERMINALJ201KeyboardSubfascia 82-0326135-04-98CA

31、BLE ASSY 3 WAYS AWG=26 2.5P UL2877 L=400mmJ753BKeyboardPower Supply Board 82-0426135-00-98CABEL ASSY 4 WAYS AWG=26 2.5P UL2877 L=200mmJ702AKeyboardMain Board Normal LED Board 82-0326135-07-98CABLE ASSY 3 WAYS AWG=26 UL2877 L=150mmJ204ALED BoardKeyboard Normal Main Board 82-0326135-05-98CABLE ASSY 3

32、WAYS AWG=26 2.5P UL2877 L=320mmJ722AMain BoardSurr Amp Board 82-0326135-06-98CABLE ASSY 3 WAYS AWG=26 2.5P UL2854 L=250mmJ715AMain BoardDSP Board 82-0626135-03-98CABLE ASSY 6 WAYS AWG=26 2.5P UL2877 L=480mm W/HOUSINGJ721AMain BoardVideo-6 Board 82-0826135-00-98CABLE ASSY 8 WAYS AWG=26 2.5P UL2877 L=

33、480mmJ709AMain BoardVideo-6 Board 82-1226135-00-98CABLE ASSY 12 WAYS AWG=26 2.5P UL2877 L=240mmJ502BMain BoardFR & C Amp board Normal Speaker Board 82-0318235-02-98CABLE ASSY 3 WAYS AWG=18 3.96P UL1007 L=120mmJ801BSpeaker BoardSurr Amp Board 82-0518235-02-95CABLE ASSY 5 WAYS AWG=18 3.96P UL1007 L=35

34、0mmJ786BSpeaker BoardSecondary Board 82-0518235-03-98CABLE ASSY 5 WAYS AWG=18 3.96P UL1007 L=300mmJ501BSpeaker BoardFR & C Amp board Normal Pre-Out Board 82-0326135-02-98CABLE ASSY 3 WAYS AWG=26 2.5P UL2854 L=700mmJ611APre-Out BoardSurr Amp Board 82-0626135-02-98CABEL ASSY 6 WAYS AWG=26 2.5P UL1533X

35、1C L=350mmJ612APre-Out BoardFR & C Amp board 82-1026135-06-98CABLE ASSY 10 WAYS AWG=26 2.5P UL2877L=50mmJ614BPre-Out BoardMulti-Channel Board 82-1026135-06-98CABLE ASSY 10 WAYS AWG=26 2.5P UL2877L=50mmJ615BPre-Out BoardMulti-Channel Board Normal Power Switch Board 82-0116435-00-95CABLE ASSY 1 WAYS A

36、WG=16 UL1672 BROWN L=370mmJ757BPower Switch BoardPower Supply Board 82-0116435-01-95CABLE ASSY 1 WAYS AWG=16 UL1672 BLUE L=370mmJ756BPower Switch BoardPower Supply Board MODEL: T752 CABLE HARNESS CROSS REFERENCE 8b Normal Secondary Board 82-1426135-00-98CABLE ASSY 14 WAYS AWG=26 2.5P UL2877 L=420mmJ

37、782ASecondary BoardMain Board Normal Trigger Board 82-0326135-03-98CABLE ASSY 3 WAYS AWG=26 2.5P UL2854 L=150mmJ304BTrigger BoardAudio Board 82-0826135-00-98CABLE ASSY 8 WAYS AWG=26 2.5P UL2877 L=480mmJ350ATrigger BoardKeyboard Normal Video-6 Board 82-0118435-00-98CABLE ASSY 1 WAY AWG18 UL1007 BLACK

38、 L=100mm W/ RING TERMINALP4401Video-6 BoardChassis Casing 36-1728201-71-26FFC CABLE 17 PINS P1.25 L=200mmJ720CMain BoardTuner 36-2028121-71-92FFC CABLE 20 PINS P1.25 L=120mmJ604CDSP BoardMulti-Channel Board 36-2028201-71-92FFC CABLE 20 PINS P1.25 L=200mmJ713CMain BoardKeyboard 36-2828201-71-92FFC CA

39、BLE 28 PINS P1.25 L=200mmJ714CMain BoardKeyboard 36-2828800-71-92FFC CABLE 28 PINS P1.25 L=80mmJ203CKeyboardDSP Board 82-0116436-12-95CABLE ASSY 1 WAY AWG=16 UL1672 BROWN L=100mmJ759AC OutletPower Supply Board 82-0116438-03-95CABLE ASSY 1 WAY AWG=16 UL1672 BLUE L=100mmJ758AC OutletPower Supply Board

40、 8c 9 OSD LC74763 Pin 4 14 B E A C Speaker Output Output Speaker Pin ( ST/MO, Mute, S Meter ) CE/Data/Clk, RDSbus VFD Driver CPUs Stereo mode AC3 mode Multi Ch in by CPU control 4966 VFD (Vacuum Florescent Display) by CPU 4966 control LINE- OUT LINE- OUT CD V1 V2 V3 V3 V4 V4 V5 TC9273N D/A CS- 49326

41、 DSP EPROM FL Config Selector FR LR SL SR BSL BSR FL FR AUDIO SELECTOR VOLUME M62446 ELECT MUTE MUTE MUTE MUTE MULTI- CH OUT FL FR C POWER AMP AMP POWER SL SR DIR CS- 8415 COAXIAL 1 COAXIAL 2 COAXIAL 3 74LS157 LR PROTECT CPU Stand- by CPUCPU OUT CPU CPU TC- 9164AN CPU SL FRONT 1 2 3 4 FR FL MULTI- C

42、H IN CPU CPU CPU CPU TUNER OUT Digital/ Analog selector SCSRSL Video Selector BA- 7625 FL FR Relay Relay Relay SL SR C Encoder Volume Sensor Remote Key Matrix Board Tuner LED Supply Power Relay AC Input Main Stand- by Power Supply +5V CPU AC Input CPU LA1837 + LC72131 + BU1924 FL FR CS4228 Bass Re-

43、direct CPU CS RESET ABOOT DATA IN DATA OUT CLOCK OUT A16 A17 CLOCK OUT DATA OUT M27C020 C B CBL F0 F1 F2 E1 E2 AT24C02 EEPRO - 004 TAPE IN TAPE OUT 96/24 OPTICAL V6 SR SUB C BSRBSL 96/24 CS4340 D/A IR In/Out LC4966 74HC251 OPTICAL OUT COAXIAL OUT CPU ON LED Protect LED Power- Down Detect MUTE CPU He

44、ad phone control to CPU force 2 channel M62446 VOLUME ELECT CPU BSL BSR BSRBSL LC4966 Config 2 EXTERNAL I/P 7.1 EXT AUDIO I/P CPU BLOCK DIAGRAM U201 A/VR (A/V Receiver) U202 VFD 10 AMPLIFIER ADJUSTMENT Idle Current 1.Rotate R522 fully clockwise. 2.Connect DC millivoltmeter to P501 (i.e. Across half of R523, 0.22 Ohm resistor). 3.Turn on the unit. 4.Adjust R522 for 1mV reading on voltmeter. 5.Leave power on for at least