NAD-T761-avr-sm 维修电路原理图.pdf

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1、NADSERVICE MANUALT 761SURROUNDSOUND RECEIVERT 761SURROUNDSOUND RECEIVERRadioFans.CN 收音机爱 好者资料库2SERVICE SAFETY PRECAUTIONS1.Replacing the fusesCAUTION: FOR CONTINUED PROTECTION AGAINST THE RISK OF FIRE REPLACE ONLYWITH SAME TYPE OF FUSE.Reference NoPart NumberDescriptionM752 *C 5120-0017-0FU T4A 250V

2、 SEMKO/UDE HBCM754 *C 5120-0018-0FU T1A 250V SEMKO/UDE 5X20MMM751 *AH 5120-0040-0FU T6.3A 250V 5X20 ULM754 *AH 5120-0052-0FUSE T1.6A 250V 5X20MMNOTE: : 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 curr

3、ent or resistance measurementsto 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.CONTENTSDESCRIPTIONPAGESPECIFICATIONS .

4、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4REAR PANEL / FRONT PANEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5DISASSEMBLY INSTRUCTIONS . . . . . . . . . . . . . . . . . . .

5、. . . . . . . . . . . . . . . . . . . . . . . . . . . . .6WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-8BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6、 . . . . . . . . . .9ADJUSTMENT POINTS DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10INSTRUMENT SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11ALIGNMENT PROCEDURES . . . . . . .

7、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-12IMPORTANT NOTES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13PCB LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8、 . . . . . . . . . . . . . . . . . . . . .14-25SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26-44IC BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45-52EL

9、ECTRICAL PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53-75EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76EXPLODED VIEW PARTS LIST . . . . . . . . . . .

10、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77-78PACKING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79RadioFans.CN 收音机爱 好者资料库3SPECIFICATIONSPOWER AMPLIFIER AND PREAMPLIFIER SECTIONRated distortion(THD

11、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 mVS/N Ratio(A-wtd, 1KHz, 1W, 8 ohm) -75 dB(A-wtd, 1KHz, 80W, 8 ohm)FL/FR/C 92 dBSL/SR -90 dBFrequency Response(20 Hz - 20 kHz)0 0.8 dBChannel Balance(1 dB to -40 dB, 1 kHz) 2 dB(-41 dB to -50 dB, 1 kH

12、z) 3 dBAudio muting at 1kHz 53 dBHeadphone O/P in 0.1%, 600 ohm load, CD in 500mV, 1 kHz 10VSubwoofer out, 500mV in(THD at 2V O/P, 100 Hz) 0.5%(S/N at 2V O/P, 100 Hz) 80 dBCrosstalk(2V input, 10W, 1 kHz) -68 dBContinuous average power output (L/R/C RL/RR 8ohms)80 WControlsBass(at 500mV in, 1W out, 1

13、00 Hz) 9 dBTreble(at 500mV in, 1W out, 10 kHz) 9 dBSURROUND SECTIONChannel separationI/p mode : L, R: 1V in, 1 kHz, Ch R, L 45 dB: o/p at unexpected, 1 kHz, Ch C 35 dBI/p mode : L= -R: 1V in, 1 kHz, Ch R, L 28 dB: o/p at unexpected, 1 kHz, Ch C 30 dBI/p mode : L= R: 1V in, 1 kHz, Ch R, L 45 dB: o/p

14、at unexpected, 1 kHz, Ch SL, SR 30 dBFrequency ResponseI/p mode : L, R: 1V in, 1W, Ch R, L40Hz0 1.5 dB20kHz0 0.8 dBI/p mode : L= R: 1V in, 1W, Ch C300Hz0 0.8 dB20kHz0 0.8 dBI/p mode : L= -R: 1V in, 1W, Ch SL, SR30Hz0 1.0 dB6.5kHz-3 1.0 dBS/N Ratio ( 200mV in, 1, A-WTD w/ 1k termination)I/p mode : L,

15、 R: 1 kHz, Ch L, R 65 dBI/p mode : L=R: 1 kHz, Ch C 65 dBI/p mode : L=-R: 1 kHz, Ch SL, SR 65 dBTHD (2.2V in, 1W, w/ 80 kHz LPF, 1 kHz) 0.2%AC-3/DTS SECTIONFrequency ResponseFL, FR, C, SL, SR:200Hz0 0.8 dB20kHz0 0.8 dBDistortion 1W all channels0.08%S/N 1 W ( CCIR/ARM, 200 Hz NOTCH & 400 Hz HPF) 85 d

16、B4AM TUNER SECTIONInput level is expressed as the reading in open-circuitof 75-ohm source impedance signal generatorUsable sensitivity (999/1000kHz) 30 dBS/N Ratio (5mV in) 38 dBTHD (5mV in) 3%IF Rejection (450 kHz) 36 dBImage Rejection (F+2xIF) 28 dBSelectivity 17 dBOutput130+/- 20mVLoop sensitivit

17、y (20dB S/N)999/1000 kHz 66 dB603/600 kHz 66 dB1404/1400 kHz 66 dBFrequency response (100 - 2.3 kHz, 5mV) 6 dBFM TUNER SECTION*C*AHInput level is expressed as the reading in open-circuitof 75-ohm source impedance signal generatorUsable Sensitivity ( 98 MHz) 15 dB 15 dBSignal / Noise RatioMono 72 dB

18、72 dB(60 dB, IHF wtd)Stereo 66 dB 66 dBFrequency Response (20 Hz - 15 kHz, 60 dB)0 1.5 dB0 1.5 dBChannel Separation (60 dB)100 Hz 30 dB 30dB1 kHz 38 dB 38 dB10 kHz 30 dB 30 dBAlternate Channel Selectivity(40 dB, 400 kHz) 60 dB 45 dBCapture Ratio (40 dB) 3 dB 3 dBAM Suppression(60 dB, 100% Mod.FM, 30

19、% Mod.AM) 48 dB 48 dBImage Rejection (119.4 MHz) 85 db 40 dBI.F. Rejection ( 10.7 MHz) 78 dB 65 dBPilot Suppression (60 dB) 60 dB 60 dBTHD (60 dB, L=R 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 dBOff 15 dB 15 dBRDS decode Sensitivity 26 dB 26

20、 dBPOWER RATINGEUROPEAN Model*CAC 230V 50Hz 2.0AUSA, CANADIAN Model*AHAC 120V 60Hz 4.2APHYSICAL SPECIFICATIONSDimensions (Width x Height x Depth)435 x 131 x 348mmNet weight14kg (31 lbs)Shipping weight16.7kg (37 lbs)516171. FM & AM ANTENNA2. TAPE 1 & CD INPUTS3. DISC INPUT4. VIDEO 1 - VIDEO 4 (AUDIO

21、& VIDEO)5. 5.1 CHANNEL INPUT6. DIGITAL AUDIO INPUTS / OUTPUTS7. AUDIO PRE OUTS8. COMPONENT VIDEO INPUT & OUTPUT9. MONITOR OUT10. SPEAKERS A: FRONT, CENTER & SURROUNDSPEAKERS11. SPEAKERS B12. SOFT CLIPPING13. NAD-LINK INPUT / OUTPUT14. 12V TRIGGER INPUT / OUTPUT15. SWITCHED POWER OUTLETS16. AC POWER

22、CORD17. COOLING FAN1. POWER2. STAND-BY3. DISPLAY4. AM/FM5. FM MUTE / MODE6. MEMORY7. PRESET / TUNE8. DOWN / UPAND 9. VFL DISPLAY10. VOLUME & SETUP11. HEADPHONE SOCKET & VIDEO 5 INPUT12. SPEAKERS A & B13. AUDIO & VIDEO INPUT SELECTORS14. TAPE MONITOR15. DIGITAL AUDIO SELECTOR16. EXT. 5.117. SURROUND

23、MODE 18. LEVELS19. TONE CONTROLS & TONE DEFEAT13191415161718REAR PANEL / FRONT PANELREAR PANELFRONT PANEL6DISASSEMBLY INSTRUCTIONS1. 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.12. Pull both

24、sides of the TOP COVER slightly outwards 8 and tilt approx. 35 and then removein the direction as indicated by the arrow 9 . Refer to Figure No.2.Figure No.2.765132498887WIRING DIAGRAMJ402ARL-BFR-BJ803AJ402BJ803BCOMPONENT VIDEO PCBC834J605BJ802BJ101BDIGITAL IN PCBNOTES :SHOWN THE WAFERSSHOWN THE SOL

25、DER END OF HARNESSSHOWN THE PIN 1 OF WIRE HARNESS7706-1220-10047702-1060-20047010-1660-1(J206C)7712-1150-30047703-1090-20047703-1480-20047710-1200-30047711-1320-20047710-1100-30047708-1150-30047706-1100-20047012-5050-0(J203C)7703-1360-20047704-1200-2004LN7703-1430-20047012-5030-0(J101C)7706-1220-100

26、47706-1480-30047712-1400-20047012-5040-0(J604C)7706-1480-3004POWER CORD1681-0060-D1681-0010-D1681-0010-D1681-0010-DAC OUTLET PCBJ102BJ701BJ901ADIGITAL PCBOUTJ503BJ801BSPEAKER PCBJ7001J401BJ709AJ710AJ901BJ708AJ703AJ708BJ704AJ706AJ705AJ206BJ502BJ701AJ701BMAIN PCBJ711AJ707AJ703BJ704BTUNER PCBAUDIO PCBJ

27、711BJ707BVIDEO PCBJ709BJ710BS-VIDEO PCBJ705BJ706BJ602AJ601AJ603AMULTI CHANNEL PCBSWITCH PCBJ208BJ206AJ207AJ204AJ203AJ201AJ202AKEYBOARDJ207BVOL PCBJ208APOWER LED PCBJ201BP751P752P753P754PSU PCBJ401AVIDEO 5 PCBJ202BJ701AJ702AJ501BSECONDARY PCBPRIMARY PCBJ505BJ502AJ802BJ503AJ501AJ504AJ603BFRONT AMP PCB

28、J604BJ802AJ801ASURROUND AMP PCBJ204BJ702BJ504BLOAD PCBJ203BJ101AJ601BJ604BJ102AAC3 PCB910BLOCK DIAGRAMCOAXIAL x3OPTICAL x2405374LS157M62446FPCOAXIAL Digital outCom-VideoTrigger INPOWER DOWNDetect Pin.For SPK off,Mute ON, VFD off.SPK. A and BTrigger outADJUSTMENT POINTS DIAGRAM1. TUNER2. IDLE CURRENT

29、 - Front Amplifier & Surround Amplifier BoardRFOSCVT11ALIGNMENT PROCEDURESAMPLIFIER SECTIONIdle CurrentStepItemConnectionAdjustment Adjust for1Front Left ChannelVoltmeter to P502 on Front Amp BoardR5742mV0.2mV2Front Right ChannelVoltmeter to P501 on Front Amp BoardR5732mV0.2mV3Center ChannelVoltmete

30、r to P503 on Front Amp BoardR5992mV0.2mV4Rear Left ChannelVoltmeter to JP801 on Surround Amplifier BoardR8672mV0.2mV(PCB N0901C-AMP2)5Rear Right ChannelVoltmeter to JP802 on Surround Amplifier BoardR8682mV0.2mV(PCB N091C-AMP2)INSTRUMENT SETUP1. FM MEASUREMENTFig. 1Fig. 22. RDS MEASUREMENTFig. 33. AM

31、 MEASUREMENTFig. 4FMSIGNALGENERATORANTENNATERMINALOUTPUTTERMINALDISTORTIONANALYZERDISTORTIONANALYZERACVOLTMETEROSCILLOSCOPEACVOLTMETEROROSCILLOSCOPEACVOLTMETEROROSCILLOSCOPEOUTPUTTERMINALOUTPUTTERMINALLRANTENNATERMINALANTENNATERMINALANTENNATERMINALAM LOOPANTENNA(Accessory)AM LOOPANTENNA60cmDIGITALMI

32、LLIVOLTMETERVT-J914FMSIGNALGENERATORAMSIGNALGENERATORFMSIGNALGENERATORRDSGENERATORFMSTEREOGENERATORP-901DCMILLIVOLTMETERUNITUNITUNITUNIT12FM/RDS SECTION- FM mono:1kHz, 75kHz devi., 60dB/V- FM stereo:1kHz, 67.5kHz devi., 60dB/VPilot signal 19kHz 7.5kHz devi.OUTPUTS- Connect the non-inductive type res

33、istor of 8 ohms to the all speaker terminals unless otherwise noted.ItemFMIF/RFStereoDistortionStereoSeparationMutingLevelSignaloutputStep1DC voltmeterL9410100mV3DistortionanalyzerDistortionanalyzerOscilloscopeOscilloscopeL942R956R941MinimumMinimum2AC voltmeterIFT on thefront endIFT on thefront endM

34、aximumMaximumseparationConnectionof instrumentFig.1Fig.2Fig.2Fig.1Channel Lor R 1kHz99.0MHz1kHz 75kHz devi.65dBf (60dB)99.0MHz Ext.mod. 65dBf(60dB)FM SGoutputStereo mod-ulator outputTuningfrequency99.0MHz99.0MHzChannel Lor R 1kHz99.0MHz Ext.mod. 65dBf(60dB)99.0MHz Ext. mod.65dBf(60dB)RDS 2% MOD99.0M

35、Hz 18dB99.0MHz99.0MHzRDSFig.399.0MHzOutputindicatorAdjustmentpointAdjustforRemarksFM MUTE/MODEswitch: ON/AUTORepeat the steps1 to 3 until no fur-ther adjustment isnecessary.FM MUTE/MODEswitch: ON/AUTODont turn morethan +/-180Repeat stereodistortion andstereo separationalignment untilTHD at minimuman

36、d separation atmaximum.Decode the RDS-Program Station.AM SECTIONAM Modulation:400Hz, 30%For AH VersionStep123530kHz600kHz990kHz600kHz400Hz 30% mod.60dB/mAM SGoutputTuningfrequencyOutputindicatorAdjustmentpoint600kHz400Hz 30% mod.60dB/mACvoltmeterACvoltmeterDigitalDCvoltmeterL972OSC coilon RFblock L9

37、71RF coilon RFblock L971Adjustfor1.350.2VMaximumMaximumStep123522kHzor531kHz603kHz999kHz600kHz400Hz 30% mod.60dB/mAM SGoutputTuningfrequencyOutputindicatorAdjustmentpoint600kHz400Hz 30% mod.60dB/mACvoltmeterACvoltmeterDigitalDCvoltmeterL972OSC coilon RFblock L971RF coilon RFblock L971Adjustfor1.30.2

38、V (522kHz)1.350.2V (531kHz)MaximumMaximumFor C Version13IMPORTANT NOTES1. Show the software versionPress “TUNE UP” and “TAPE MONITOR”.2. Toggle between PAL and NTSCPress “MEMORY” and “SPEAKER A”.3. Light up all the icon on the VFL.Press “FM/MUTE” and “SPEAKER B”.4. Toggle between 9K and 10KPress “FM

39、/MUTE” and “Digital Audio Selector”.5. Clear all tuner presetsChange the setting of 9KHz / 10KHz Step.14PCB LAYOUTSPEAKER BOARDPRIMARY BOARDLED BOARDSECONDARY BOARDAC OUTLET BOARD15DIGITAL IN BOARDS-VIDEO BOARDDIGITAL OUT BOARD16PSU BOARDCOMPONENT VIDEO BOARD17LOAD BOARDVOLUME BOARD(Top View)(Bottom

40、 View)SURROUND AMP BOARDVIDEO 5 BOARD18AC3 BOARD - COMPONENT SIDE19AC3 BOARD - SOLDER SIDE20FRONT AMP BOARD2221KEY BOARD - COMPONENT SIDEKEY BOARD - SOLDER SIDE2324MAIN BOARDVIDEO BOARDMULTI-CHANNEL BOARDAUDIO BOARDPOWER SWITCH BOARD26TO MAIN BOARDJ707ATO MAIN BOARDJ711ASCHEMATIC DIAGRAMAUDIONOTE: 1

41、. RESISTORS, ARE CARBON FILM 5% 1/8W UNLESS OTHERWISE SPECIFIED.2. CERAMIC CAPACITORS, ARE 50V 10%. UNLESS OTHERWISE SPECIFIED.25TUNER BOARD2827KEYBOARDLED PCBM301VOLUME PCBNOTE: 1. RESISTORS, ARE CARBON FILM 5% 1/8W UNLESSOTHERWISE SPECIFIED.2. CERAMIC CAPACITORS, ARE 50V 10%. UNLESSOTHERWISE SPECI

42、FIED.3029AC3 / DTSNOTE: 1. RESISTORS, ARE CARBON FILM 5% 1/10WUNLESS OTHERWISE SPECIFIED.2. CERAMIC CAPACITORS, ARE 50V 10%.UNLESS OTHERWISE SPECIFIED.3231(TO FRONT AMPJ603B)MULTI-CHANNELNOTE: 1. RESISTORS, ARE CARBON FILM 5% 1/8W UNLESSOTHERWISE SPECIFIED.2. CERAMIC CAPACITORS, ARE 50V 10%. UNLESSO

43、THERWISE SPECIFIED.3433(MF)(MF)(MF)(MF)(MF)(MF)(MF)(MF)(MF)(MF)(MF)(MF)(MF)(MF)(MF)(MF)(MF)(MF)(MF)(MF)(MF)!FRONT AMPLIFIERNOTE: 1. RESISTORS ARE CARBON FILM 5%1/8W UNLESS OTHERWISE SPECIFIED.MF - METAL FILM2. CERAMIC CAPACITORS ARE 50V 10%. UNLESS OTHERWISE SPECIFIED.3. COMPONENTS MARKED “” ARE SAF

44、ETY CRITICAL PARTS.3635S-VIDEO / VIDEONOTE: 1. RESISTORS ARE CARBON FILM5%1/8W UNLESS OTHERWISESPECIFIED.2. CERAMIC CAPACITORS ARE50V 10%. UNLESS OTHERWISESPECIFIED.3837(TO MAIN J703A)M903SFE10.7mA5TUNERNOTE: 1. RESISTORS, ARE CARBON FILM 5% 1/8W UNLESS OTHERWISE SPECIFIED.2. CERAMIC CAPACITORS, ARE

45、 50V 10%. UNLESS OTHERWISE SPECIFIED.4039MAIN BOARD / VIDEO 5(TO AC3 J604B)(TO VIDEO J708B)(TO Front Amp J502A)(TO Front Amp J701A)NOTE: 1. RESISTORS, ARE CARBON FILM 5% 1/8W UNLESS OTHERWISE SPECIFIED.MF-METAL FILM2. CERAMIC CAPACITORS, ARE 50V 10%. UNLESS OTHERWISE SPECIFIED.41SURROUND AMPLIFIER(T

46、O FRONT AMP J802B)(TO MULTI J602A)NOTE: 1. RESISTORS ARE CARBON FILM 5%1/8W UNLESS OTHERWISE SPECIFIED.MF - METAL FILM2. 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 & SECONDARYNOTE: 1.

47、 RESISTORS ARE CARBON FILM 5% 1/8W UNLESS OTHERWISE SPECIFIED.MF - METAL FILM2. CERAMIC CAPACITORS ARE 50V 10%. UNLESS OTHERWISE SPECIFIED.3. COMPONENTS MARKED “” ARE SAFETY CRITICAL PARTS.43OYZ-COMOEINHVEEVDDY-COMX-COMOXABCVSS(TO MAIN J901B)CrCbCrYYCbCOMPONENT VIDEONOTE: 1. RESISTORS ARE CARBON FIL

48、M 5% 1/8WUNLESS OTHERWISE SPECIFIED.2. CERAMIC CAPACITORS ARE 50V 10%.UNLESS OTHERWISE SPECIFIED.44(TO KEY BOARD J204A)(TO FRONT AMP J504A)LOADNOTE: 1. RESISTORS ARE CARBON FILM 5% 1/8W UNLESS OTHERWISE SPECIFIED.2. CERAMIC CAPACITORS ARE 50V 10%. UNLESS OTHERWISE SPECIFIED.45IC BLOCK DIAGRAMAC3 BOA

49、RDU101: 74HC151AC3 BOARDU102: 74HC157AC3 BOARDU103: CS5331A1D32D23D14D05Y6W7ST16 VCC15 D414 D513 D612 D711 A10 B8GND9C1211109S713S614S515S41S32S23S141213141512347ST6W5YS0S7S7AS6S6S5S5S4S4S3S3S2S2S1S1S0S0BC41Y72Y93Y124Y151G134B103B62B52A31B21A113A144AA/B1A/BVCC1621AG1531B4A1441Y4B1352A4Y1262B3A1172Y3

50、B108GND3Y9AINL8+-+-+-5674231AINRAGNDS/HComparatorMCLKSCLKLRCKSDATAComparatorVoltage ReferenceSerial Output InterfaceDigitalDecimationFilterDigitalDecimationFilterHighPassFilterHighPassFilterS/HVA+-LP FilterDACDACLP Filter46AC3 BOARDU104, U109, U116, U131U134: NE5532 AMPLIFIER 1OUTPUTINVERTINGINPUTNO