NAD-T752-avr-sm(1) 维修电路原理图.pdf

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1、NADSERVICE MANUALT 752T 752AV SURROUNDSOUND RECEIVERAV SURROUNDSOUND RECEIVERDRAFT DATE: 08 OCT, 2002RadioFans.CN 收音机爱 好者资料库2SAFETY INFORMATIONRadioFans.CN 收音机爱 好者资料库3SERVICE SAFETY PRECAUTIONS1. Replacing the fusesCAUTION:FOR CONTINUED PROTECTION AGAINST THE RISK OF FIRE REPLACE ONLY WITH SAME TYPE

2、 OFFUSE.Reference DesignatorPart NumberDescriptionF751*AH33-0160001-00-48Fuse 8A 250V Time Lag 5x20 MM UL/CSAF751*C33-0131002-00-48Fuse 5A 250V Time Lag 5x20 MM SEMKO/VDEF752*AH33-0111006 -00-48Fuse 1.6A 250V Time Lag 5x20 MMUL/CSA/VDE/SEMKOF752*C33-0151006 -00-48Fuse 800mA 250V Time Lag 5x20 MMUL/C

3、SA/VDE/SEMKONOTE: : 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 determinethat exposed parts are acceptably insulated from supply circuit.CONTENTSDESCRIPTIONPAGESP

4、ECIFICATIONS . 4 - 5REAR PANEL / FRONT PANEL VIEW . 6DISASSEMBLY INSTRUCTIONS . 7WIRING DIAGRAM . 8BLOCK DIAGRAM . 9ADJUSTMENT POINTS DIAGRAM / AMPLIFIER ADJUSTMENT . 10PCB LAYOUT. 11 - 23SCHEMATIC DIAGRAM . 24 - 36IC BLOCK DIAGRAM. 37 - 45EXPLODED VIEW . 46EXPLODED VIEW PARTS LIST . 47 - 48ELECTRIC

5、AL PARTS LIST . 49 - 58PACKING DIAGRAM . 59Parts marked with the symbol are critical with regard to the risk of fire and electric shock.Replace only with parts recommended by the manufacturer.4SPECIFICATIONSPOWER AMPLIFIER SECTIONRated distortion(Rated power level into 8 ohms, THD 20 Hz-20 kHz FL/C/

6、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 mVS/N Ratio(A-wtd, 1kHz, 1 W, 8 ohm, SL/SR) - 80 dB(A-wtd, 1kHz, 80 W, 8 ohm, SL/SR) - 96 dBFrequency Response(20 Hz - 20 kHz)0 0.8 dBChannel Balance(1 dB to -40 dB, 1 kHz) 2 dB(-41 dB t

7、o -50 dB, 1 kHz) 3 dBAudio muting at 1 kHz 55 dBSubwoofer out, 500 mV in (THD at 2 V O/P, 100 Hz) 0.5 %Crosstalk(500 mV input, 10 W, 1 kHz) -70 dBControlsBass(at 500 mV in, 1 W out, 100 Hz) 10 dB 2 dBTreble(at 500 mV in, 1 W out, 10 kHz) 10 dB 2 dBDOLBY DIGITAL SECTIONChannel Difference(FL ref. Trac

8、k 30) 1.2 dBFrequency Response Dolby config.2 SL Track 46 200 - 20 kHz 0.8 dBSR Track 47 200 - 20 kHz 0.8 dBC Track 44 200 - 20 kHz 0.8 dBHarmonic Distortion (1 W, Audio LPF, Dolby Config.1) FL Track 65 997 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 6

9、6 997 Hz 0.08 %S/N Ratio(31 for O/P 1 W, Track 35)CCIR / ARM 65 dBAudio LPF 70 dBA-wtd 70 dBChannel Separation(1 W, 20 kHz LPF)Track 65 997 Hz 75 dBDOLBY PRO LOGIC II SECTIONFrequency ResporseI/P mode : L, R: 1 V in, 1 W, Ch L/R40 Hz0 1.5 dB20 Hz0 0.8 dBI/P mode : L, R: 1 V in, 1 W, Ch C300 Hz0 0.8

10、dB20 Hz0 0.8 dBI/P mode : L, R: 1 V in, 1 W, Ch SL/SR40 Hz0 1.5 dB20 Hz-3 1.0 dBS/N Ratio (200 mV in, 1 W, A-WTD w/ 1 k termination)I/P mode : L, 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 (2.2 V in, 1 W, w/ 80 kHz LPF, 1 kHz) 0.2 %5AM TUNER SEC

11、TIONInput level is expressed as the reading in open circuitof 75-ohm source impedance signal generatorUsable sensitivity(999/1000 kHz) 30 dBuvS/N Ratio(5 mV in) 30 dBTHD(5 mV in) 3 %IF Rejection(450 kHz) 36 dBImage Rejection(F+2xIF) 28 dBSelectivity 17 dBOutput110 20 mVLoop sensitivity(20 dB S/N)999

12、/1000 kHz 66 dB603/600 kHz 66 dB1404/1400 kHz 66 dBFrequency Response(100 - 2.3 kHz, 5 mV) 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 dBuv 15 dBuvS/N Ratio(60 dB, IHF wtd)Mono 65 dB 65 dBSte

13、reo 60 dB 60 dBFrequency Response(20 Hz - 15 kHz, 60 dBm)0 1.5 dB0 1.5 dBChannel Separation(60 dBm)100 Hz 30 dB 30 dB1 Hz 35 dB 35 dB10 Hz 20 dB 25 dBAlternate Channel Selectivity (40 dBm, 400 kHz) 60 dB 45 dBCapture Ratio(40 dBm) 3 dB 3 dBAM Suppression (60 dBm, 100% Mod. FM, 30% Mod. AM) 40 dB 40

14、dBImage Rejection(119.4 MHz) 65 dB 65 dBI.F. Rejection(10.7 MHz) 78 dB 65 dBPilot Suppression(60 dBm) 60 dB 60 dBTHD (60 dBm, L=R 75 kHz for AH, 40 kHz Dev for C)Mono 0.8 % 0.8 %Stereo 1 % 1 %Auto-Search SensitivityOn 24 dBuv 24 dBuvOff 15 dBuv 15 dBuvRDS decode Sensitivity 26 dBuv-PHYSICAL SPECIFIC

15、ATIONSDimensions (Width x Height x Depth)435 x 133 x 349 mmNet Weight14.40 Kg (31.68 lbs)Shipping Weight16.00 Kg (35.20 lbs)612345 6789192011121314151617181023115121456811910167413FRONT PANELREAR PANEL / FRONT PANEL VIEWREAR PANEL1.FM & AM ANTENNA2.MAIN IN / AUDIO PRE-OUTS /SUBWOOFER OUT3.MONITOR OU

16、T4.CD INPUT5.DISC INPUT6.IR INPUT & OUTPUT7.COMPONENT VIDEO IN & COMPONENTVIDEO OUT8.SOFT CLIPPING ON/OFF9.SWITCHED POWER OUTLETS10.AC POWER CORD11.DIGITAL AUDIO INPUTS & DIGITAL AUDIOOUTPUT12.FRONT, CENTER & SURROUND SPEAKERS13.12V TRIGGER INPUT & OUTPUT14.VIDEO 1 - VIDEO 5 (AUDIO & VIDEO)15.TAPE I

17、NPUT & OUTPUT16.7.1 CHANNEL INPUTS1.POWER2.STAND-BY3.AM / FM4.DISPLAY5.MEMORY6.FM MUTE / MONO7.PRESET DOWN / UP8.SEARCH DOWN / UP9.VFL DISPLAY10.VOLUME11.VIDEO & AUDIO12.TAPE MONITOR13.DIGITAL AUDIO SELECTOR14.EXT. 7.115.SURROUND MODE16.LEVELS17.TONE CONTROLS18.TONE DEFEAT19.VIDEO 6 INPUT20.PHONES7D

18、ISASSEMBLY INSTRUCTIONS1.Remove machine screws M4.0 x 8.0 (1 to 6) from the side panels.Remove tapping screw 3.0 x 8.0 (7 to 10) from the back panel.Refer to Figure No. 1.145678910232.Pull both sides of the TOP COVER slightly outwards 11 and tilt approx. 35 and then removein thedirection as indicate

19、d by the arrow 12. Refer to Figure No. 2.Figure No. 1121111Figure No. 282- 0116435- 00- 95CABLE ASSY 1 WAY #16 UL 1672 BROWN L=400MMCABLE ASSY 3 WAYS #26 UL2877 L=15082- 0326135- 07- 98VIDEO 6INPUT BOARDJ721BJ709BTO SECONDARY TRANSFORMERTO TRANSFORMERTHERMOSTATTO SECONDARY TRANSFORMERTO PIRMARYTRANS

20、FORMER82- 1426135- 00- 98CABLE ASSY 14 WAYS #262.5P UL2877 L=420mmSECONDARY BOARD3.96P UL1015 L=90mm82- 0818235- 00- 98J783AJ782AJ784AJ781APOWER SWITCHBOARDACABLE ASSY 1 WAY #16UL1672 BLUE L=10082- 0116436- 12- 95(FOR AH VESION ONLY)CABLE ASSY 1 WAY #16 UL1672 BROWN L=100mm(FOR AH VESION ONLY)POWER

21、SUPPLYBOARD82- 0116438- 03- 95J304B82- 0826135- 00- 9882- 0116435- 01- 95J756UL 1672 BLUE L=400MMCABLE ASSY 1 WAY #16CABLE ASSY 8 WAYS #262.5P UL2877 L=480mmJ758 J758ALJ759NJ75782- 0326135- 03- 98CABLE ASSY 3 WAYS #26 2.5P UL2854 L=150mmTRIGGER BOARD2.5P UL2877 L=500mm82- 1026135- 01- 98CABLE ASSY 1

22、0 WAYS #2682- 0326135- 04- 98J203AJ702AP1.25 L=200mmFFC CABLE 20 PINS36- 2028201- 71- 92CABLE ASSY 3 WAYS #262.5P UL2877 L=400mmJ753BKEYBOARDFFC CABLE 28 PINS36- 2828201- 71- 92P1.25 L=200mmJ717AJ705ACABLE ASSY 8 WAYS #262.5P UL2877 L=480mm82- 0826135- 00- 9882- 0626135- 03- 98CABLE ASSY 6 WAYS #262

23、.5P UL2877 L=480mm W/HOUSINGJ781BJ503BJ722BJ611BJ782BJ709ACABLE ASSY 12 WAYS #2682- 1226135- 00- 982.5P UL2877 L=240CABLE ASSY 3 WAYS #2682- 0326135- 05- 98MAIN BOARDJ721AJ502B J722A82- 0318235- 00- 98CABLE ASSY 3 WAYS #183.96P UL1015 L=100mmJ304A82- 0226135- 00- 98CABLE ASSY 2 WAYS #26UL2877 L=150m

24、mJ755AAUDIO BOARD82- 0326135- 02- 98J801BJ704AJ720AJ501BJ718AJ203BFFC CABLE 28 PINS P1.25 L=80mmCABEL ASSY 4 WAYS # 26 2.5P UL2877 L=200mm82- 0326135- 06- 982.5P UL2854 L=250mm82- 0426135- 00- 98CABLE ASSY 3 WAYS #2636- 2828800- 71- 92J612BCABLE ASSY 12 WAYS #262.5P UL2877 L=120mm82- 1224135- 02- 98

25、J719AJ502AJ503AJ501AFFC CABLE 20 PINS P1.25 L=120mmCABEL ASSY 6 WAYS #26 2.5P UL1533X1C L=350mm36- 2028121- 71- 9282- 0626135- 02- 98J414BCABLE ASSY 5 WAYS #18 3.96P UL1015 L=250mmFFC CABLE 17 PINS P1.25 L=150mm82- 0518235- 00- 9836- 1728151- 71- 92J414AM504TO FANTO THERMISTORTUNERCOMPONENT VIDEO BO

26、ARD J1009AJ719BJ718BJ611AJ614BPRE- OUT BOARDJ717B82- 1026135- 06- 98CABLE ASSY 10 WAYS #26 2.5P UL2877L=50mmMULTI- CHANNEL BOARDFRONT/CENTERAMPLIFIER BOARDS- VIDEO BOARDDIGITAL BOARDDSP BOARDLED BOARDSURROUNDAMPLIFIER BOARDVIDEOBOARDWIRING DIAGRAM8a Part No.DescriptionLocationStartEndNormal Front an

27、d Center Amp Board82-1224135-02-98CABLE ASSY 12 WAYS AWG=26 2.5P UL2877 L=120mmJ503AFR & C Amp boardSurr Amp BoardNormal Surround Amp Board82-0318235-03-98CABLE ASSY 3 WAYS AWG=18 3.96P UL1007 L=180mmJ504BSurr Amp BoardFR & C Amp board82-0818235-00-98CABLE ASSY 8 WASY AWG=18 3.96P UL1015 L=90mmJ781B

28、Surr Amp BoardSecondary BoardNormal Component Video Board82-0826135-01-98CABLE ASSY 8 WAYS AWG=26 2.5P UL2877 L=450mmJ414BComponent Video BoardS-Video BoardNormal Digital Input Board82-0426135-02-98CABLE ASSY 4 WAYS AWG=26 2.5P UL2877 L=500mmJ1010ADigital Input BoardDSP Board82-1226135-03-98CABLE AS

29、SY 12 WAYS AWG=26 2.5P UL1533 L=500mmJ1009ADigital Input BoardDSP BoardNormal Keyboard82-0118435-00-98CABLE ASSY 1 WAY AWG18 UL1007 BLACK L=100mm W/ RING TERMINALJ201KeyboardSubfascia82-0326135-04-98CABLE ASSY 3 WAYS AWG=26 2.5P UL2877 L=400mmJ753BKeyboardPower Supply Board82-0426135-00-98CABEL ASSY

30、 4 WAYS AWG=26 2.5P UL2877 L=200mmJ702AKeyboardMain BoardNormal LED Board82-0326135-07-98CABLE ASSY 3 WAYS AWG=26 UL2877 L=150mmJ204ALED BoardKeyboardNormal Main Board82-0326135-05-98CABLE ASSY 3 WAYS AWG=26 2.5P UL2877 L=320mmJ722AMain BoardSurr Amp Board82-0326135-06-98CABLE ASSY 3 WAYS AWG=26 2.5

31、P UL2854 L=250mmJ715AMain BoardDSP Board82-0626135-03-98CABLE ASSY 6 WAYS AWG=26 2.5P UL2877 L=480mm W/HOUSINGJ721AMain BoardVideo-6 Board82-0826135-00-98CABLE ASSY 8 WAYS AWG=26 2.5P UL2877 L=480mmJ709AMain BoardVideo-6 Board82-1226135-00-98CABLE ASSY 12 WAYS AWG=26 2.5P UL2877 L=240mmJ502BMain Boa

32、rdFR & C Amp boardNormal Speaker Board82-0318235-02-98CABLE ASSY 3 WAYS AWG=18 3.96P UL1007 L=120mmJ801BSpeaker BoardSurr Amp Board82-0518235-02-95CABLE ASSY 5 WAYS AWG=18 3.96P UL1007 L=350mmJ786BSpeaker BoardSecondary Board82-0518235-03-98CABLE ASSY 5 WAYS AWG=18 3.96P UL1007 L=300mmJ501BSpeaker B

33、oardFR & C Amp boardNormal Pre-Out Board82-0326135-02-98CABLE ASSY 3 WAYS AWG=26 2.5P UL2854 L=700mmJ611APre-Out BoardSurr Amp Board82-0626135-02-98CABEL ASSY 6 WAYS AWG=26 2.5P UL1533X1C L=350mmJ612APre-Out BoardFR & C Amp board82-1026135-06-98CABLE ASSY 10 WAYS AWG=26 2.5P UL2877L=50mmJ614BPre-Out

34、 BoardMulti-Channel Board82-1026135-06-98CABLE ASSY 10 WAYS AWG=26 2.5P UL2877L=50mmJ615BPre-Out BoardMulti-Channel BoardNormal Power Switch Board82-0116435-00-95CABLE ASSY 1 WAYS AWG=16 UL1672 BROWN L=370mmJ757BPower Switch BoardPower Supply Board82-0116435-01-95CABLE ASSY 1 WAYS AWG=16 UL1672 BLUE

35、 L=370mmJ756BPower Switch BoardPower Supply BoardMODEL: T752CABLE HARNESS CROSS REFERENCE 8bNormal Secondary Board82-1426135-00-98CABLE ASSY 14 WAYS AWG=26 2.5P UL2877 L=420mmJ782ASecondary BoardMain BoardNormal Trigger Board82-0326135-03-98CABLE ASSY 3 WAYS AWG=26 2.5P UL2854 L=150mmJ304BTrigger Bo

36、ardAudio Board82-0826135-00-98CABLE ASSY 8 WAYS AWG=26 2.5P UL2877 L=480mmJ350ATrigger BoardKeyboardNormal Video-6 Board82-0118435-00-98CABLE ASSY 1 WAY AWG18 UL1007 BLACK L=100mm W/ RING TERMINALP4401Video-6 BoardChassisCasing36-1728201-71-26FFC CABLE 17 PINS P1.25 L=200mmJ720CMain BoardTuner36-202

37、8121-71-92FFC CABLE 20 PINS P1.25 L=120mmJ604CDSP BoardMulti-Channel Board36-2028201-71-92FFC CABLE 20 PINS P1.25 L=200mmJ713CMain BoardKeyboard36-2828201-71-92FFC CABLE 28 PINS P1.25 L=200mmJ714CMain BoardKeyboard36-2828800-71-92FFC CABLE 28 PINS P1.25 L=80mmJ203CKeyboardDSP Board82-0116436-12-95CA

38、BLE ASSY 1 WAY AWG=16 UL1672 BROWN L=100mmJ759AC OutletPower Supply Board82-0116438-03-95CABLE ASSY 1 WAY AWG=16 UL1672 BLUE L=100mmJ758AC OutletPower Supply Board8c9OSDLC74763Pin414BEACSpeakerOutputOutputSpeakerPin ( ST/MO, Mute, S Meter )CE/Data/Clk, RDSbusVFD DriverCPUsStereo modeAC3 modeMulti Ch

39、 inby CPUcontrol4966VFD (Vacuum Florescent Display)by CPU4966controlLINE- OUTLINE- OUTCDV1V2V3V3V4V4V5TC9273ND/ACS- 49326DSPEPROMFLConfigSelectorFRLRSLSRBSLBSRFLFRAUDIOSELECTORVOLUMEM62446ELECTMUTEMUTEMUTEMUTEMULTI- CHOUTFLFRCPOWERAMPAMPPOWERSLSRDIRCS- 8415COAXIAL 1COAXIAL 2COAXIAL 374LS157LRPROTECT

40、CPUStand- byCPUCPUOUTCPUCPUTC- 9164ANCPUSLFRONT1234FRFLMULTI- CHINCPUCPUCPUCPUTUNEROUTDigital/AnalogselectorSCSRSLVideoSelectorBA- 7625FLFRRelayRelayRelaySLSRCEncoderVolumeSensorRemoteKeyMatrixBoardTunerLEDSupplyPowerRelayAC InputMainStand- byPowerSupply+5V CPUAC InputCPULA1837 +LC72131 +BU1924FLFRC

41、S4228BassRe- directCPUCSRESETABOOTDATA INDATA OUTCLOCK OUTA16A17CLOCK OUTDATA OUTM27C020CBCBLF0F1F2E1E2AT24C02EEPRO- 004TAPEINTAPEOUT96/24OPTICALV6SRSUBCBSRBSL96/24CS4340D/AIRIn/OutLC496674HC251OPTICAL OUTCOAXIAL OUTCPUONLEDProtectLEDPower- DownDetectMUTECPUHead phonecontrol toCPUforce 2 channelM624

42、46VOLUMEELECTCPUBSLBSRBSRBSLLC4966Config 2EXTERNALI/P7.1 EXTAUDIOI/PCPUBLOCK DIAGRAMU201 A/VR (A/V Receiver) U202 VFD 10AMPLIFIER ADJUSTMENTIdle Current1.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

43、 1mV reading on voltmeter.5.Leave power on for at least 5 min, and check for idle current again.6.Repeat for other channels.CHANNELJUMPERVRFLP503R571FRP502R545CP501R522SLP801R835SRP802R836ISC Sensitivity1.Connect 8 ohm loading to all channels.2.Rotate R886 fully clockwise.3.Load all channels at full

44、 power using 1kHz sine wave.4.At this time, monitor the THD of the output. Clipping should occur before full power achieved.5.Rotate R886 counter-clockwise slowly until the THD just below 0.1%.6.The procedure is finish at this step.7.Load all channels at full power using 1kHz sine wave with 4 ohm lo

45、ad.8.The clipping power(at THD 0.1%) should less than 85W.ADJUSTMENT POINT DIAGRAMFRONT/CENTER AMPLIFIER BOARDSURROUND AMPLIFIER BOARD11PCB LAYOUTAUDIO BOARD - COMPONENT SIDEAUDIO BOARD - COPPER SIDE12COMPONENT VIDEO BOARD - COMPONENT SIDECOMPONENT VIDEO BOARD - COPPER SIDEDIGITAL BOARD - COMPONENT

46、SIDE SIDEDIGITAL BOARD - COPPER SIDE13DSP BOARD - COPPER SIDEDSP BOARD - COMPONENT SIDE14FRONT/CENTER AMPLIFIER BOARD15SURROUND AMPLIFIER BOARD16KEY BOARD - COMPONENT SIDEKEY BOARD - COPPER SIDE17MAIN BOARD18MULTI-CHANNEL BOARD19SECONDARY/POWER SWITCH/LED BOARDPOWER SUPPLY BOARD (STANDBY)20PRE-OUT B

47、OARD21SPEAKER TERMINAL BOARDTRIGGER BOARDVIDEO 6 BOARD22S-VIDEO BOARDCOMPOSITE VIDEO BOARD- COMPONENT SIDE- COPPER SIDE23U303IC- LC4966U302IC- LC4966U301TC9273J305Jumper wire toTrigger J305AJ617AJumper wire toPre-Out J617Jumper / Short PadDTA144ESADTC144ESAE C BRV1 INLRV2 INLRV3 INLRV3 OUTLRV4 INLRV

48、4 OUTLRV5 INLRCD NLSCHEMATIC DIAGRAMAUDIO SWITCHRESISTORS : UNLESS OTHERWISE SPECIFIED ARE CARBON FILM.NOTE:1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%.2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%.24E C B2SA933MONITOR OUTVIDEO 5 INVIDEO 4 OUTVIDEO 3 OUTVIDEO 4 INVID

49、EO 3 INVIDEO 2 INU4201LC4966U4202BA7625VIDEO 1 INCOMPONENT VIDEOU4301BA7760FSU430274HC4052U430374HC4052DTC144ESAE C BCOMPONENTVIDEO 1COMPONENTVIDEO 2COMPONENTVIDEO OUTRESISTORS : UNLESS OTHERWISE SPECIFIED ARE CARBON FILM.NOTE:1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%.2. ALL CERAMIC CAP

50、ACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%.COMPOSITE VIDEORESISTORS : UNLESS OTHERWISE SPECIFIED ARE CARBON FILM.NOTE:1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%.2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%.25ISCE C B2SA10152SC1815RESISTORS : UNLESS OTHERWISE