NAD-T785-avr-sm 维修电路原理图.pdf

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1、NADSERVICE MANUALT 785T 785Surround Sound Receiver Surround Sound ReceiverDRAFT DATE: MARCH 2010RadioFans.CN 收音机爱 好者资料库2SAFETY INFORMATIONManufactured under license under U.S. Patent #s: 5,451,942; 5,956,674; 5,974,380; 5,978,762; 6,226,616; 6,487,535; 7,003,467; 7,212,872 & other U.S. and worldwide

2、 patents issued & pending. DTS is a registered trademark & the DTS logos and Symbol are trademarks of DTS, Inc. 1996-2007 DTS, Inc. All Rights Reserved.9RadioFans.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

3、 SAME TYPE OF FUSE.Reference Designator Database Part Number DescriptionF8001*AH 20-001-0078-90 FUSE TIME-LAG 10A/250VAC 5X20mm UL/CSA 5TF8001*C,CT 20-001-0078-90 FUSE TIME-LAG 10A/250VAC 5X20mm UL/CSA 5T F8002*AH 20-001-0076-90 FUSE 1.6A 250V TIME LAG LBC 5x20mm TSD UL/CSA/VDE/SEMKOF8002*C,CT 20-00

4、1-0069-90 FUSE TIME-LAG 800mA 250V 5x20mm TSD UL/CSA/VDE/CCC WALTER 5X20mm VDE/UL/CSA 5T 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 expos

5、ed parts are acceptably insulated from supply circuit.Parts marked with the symbol are critical with regard to the risk of fire and electric shock. CONTENTSDESCRIPTION PAGESPECIFICATIONS .4 - 5REAR PANEL / FRONT PANEL VIEW .6DISASSEMBLY INSTRUCTIONS .7WIRING DIAGRAM .8 - 9BLOCK DIAGRAM.10SPECIAL FUN

6、CTION .11DETAILS & WAVEFORMS ON SYSTEM & TEST & DEBUGGING.12-15 ADJUSTMENT POINTS DIAGRAM / AMPLIFIER ADJUSTMENT .16-17PCB LAYOUT .18-41SCHEMATIC DIAGRAM .42-69ELECTRICAL PARTS LIST .70-95IC BLOCK DIAGRAM .96-120EXPLODED VIEW .121-122EXPLODED VIEW PARTS LIST .123-126SINGLE CHANNEL SERVICE KIT .127-1

7、28 PACKING DIAGRAM .1294SPECIFICATIONSPOWER AMPLIFIER SECTIONRated 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/BS) 0.1 %Input Sensitivity (ref. 8 ohms, 1 kHz) 1.46 0.1 VS/N Ratio (A-wtd, 1kHz, 1 W, 8 ohm, SL/SR/BL)

8、 - 80 dBFrequency Response (20 Hz - 20 kHz) 0 1.0 dBChannel Balance (1 dB to -40 dB, 1 kHz) 2 dB (-41 dB to -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) -54 dBControlsBass (at 500 mV in, 1 W out, 100 Hz) 10

9、 dB 2 dBTreble (at 500 mV in, 1 W out, 10 kHz) 10 dB 2 dBDOLBY DIGITAL SECTIONChannel Difference (FL ref. Track 30) 1.2 dBFrequency Resporse at 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 dBHarmonic Distortion (1 W, Audio LPF, Dolby Cong

10、fig 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 66 997 Hz 0.08 %S/N Ratio (31 for O/P 1 W, Track 35) CCIR / ARM 65 dB Audio LPF 64 dB A-wtd 68 dBChannel Separation (1 W, 20 kHz LPF) Track 65 997 Hz 55 dBDOLBY PRO LOGIC II SECTION

11、Frequency ResponseI/P mode : L, R : 1 V in, 1 W, Ch L/R 40 Hz 0 2.0 dB 20 Hz 0 2.0 dBI/P mode : L=R : 1 V in, 1 W, Ch /L/R 40 Hz 0 2.0 dB Ch C 20 kHz 0 2.0 dBI/P mode : L=-R : 1 V in, 1 W, Ch SL/SR 40 Hz 0 2.0 dB 20 kHz 0 2.0 dBS/N Ratio (200 mV in, 1 W, A-WTD w/ 1 k termination)I/P mode : L, R : 1

12、kHz, Ch L/R 60 dBI/P mode : L=R : 1 kHz, Ch C 60 dBI/P mode : L=-R : 1 kHz, Ch SL/SR 60 dBTHD (2.2 V in, 1 W, w/ 80 kHz LPF, 1 kHz) 0.2 %5DTS SECTIONOutput Level (Vol 0 dB) : FL/FR/C/SL/SR Track 6 1 kHz 0.5 -0.2/+0.8 WChannel Difference (FL ref) : FL/FR/C/SL/SR Track 6 1 kHz 0 1.0 dBHarmonic Distort

13、ion (Audio Filter) : FL/FR/C/SL/SR Track 10-14 1 kHz 0.08 %Frequency Response (20 Hz to 20 kHz) Track 26-30 +2/-1.5 dBSubwoofer Output Level 1 kHz ref at pre-out (FL) Play Track 10, charge to 15 12.5 1.5 dBAM TUNER SECTIONInput level is expressed as the reading in open circuitof 75-ohm source impeda

14、nce signal generatorUsable sensitivity (999/1000 kHz) 60 dBVS/N Ratio (5 mV in) 38 dBTHD (5 mV in) 3 %IF Rejection (450 kHz) 36 dBImage Rejection (F+2xIF) 28 dBSelectivity 17 dBOutput 170 -20/+30 mVLoop sensitivity (20 dB S/N) 999/1000 kHz 66 dB 603/600 kHz 66 dB 1404/1400 kHz 66 dBFrequency Respons

15、e (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 dB 15 dBvS/N Ratio (60 dB, IHF wtd) Mono 60 dB 60 dB Stereo 63 dB 63 dBFrequency Response (20 Hz - 15 kHz, 60 dB) 0 1.5

16、dB 0 1.5 dBChannel Separation (60 dB) 100 Hz 30 dB 30 dB 1 k 32 dB 32 dB 10 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% Mod. AM) 48 dB 48 dBImage Rejection (119.4 MHz) 65 dBI.F. Rejection (10.7 MHz)

17、78 dB Pilot Suppression (98 MHz) 50 dB 50 dBTHD (60 dB, L=R 75 kHz for AH, 40 kHz Dev for C) Mono 0.5 % 0.5 % Stereo 0.5 % 0.5 %Auto-Search Sensitivity On 24 dB 24 dB Off 15 dB 15 dBRDS decode Sensitivity 26 dB PHYSICAL SPECIFICATIONSDimensions (Width x Height x Depth) 435 x 180 x 431 mmNet Weight 2

18、6.05 Kg (57.31 lbs)Shipping Weight 31.1 Kg (68.42 lbs)6FRONT PANELREAR PANEL / FRONT PANEL VIEWREAR PANEL1. DIGITAL AUDIO IN/OUT2. FM,AM ANTENNA INPUT3. COMPONENT IN/OUT4. MP DOCK5. AUDIO/VIDEO 3/4 OUT6. MONITOR(S-VIDEO,VIDEO)1. POWER BUTTON2. STANDBY LED3. INFO4. AM/FM/DB5. TUNER MODE6. MEMORY7. NA

19、VIGATION AND ENTER BUTTON8. VACUUM, FLUORES CENT DISPLAY(VFD)9. VOLUME10. SPEAKER A/B11. SOURCE12. LISTENING MODE13. TONE CONTROLS14. TONE DEFEAT15. FRONT INPUT/MP16. PHONES17. FRONT INPUT JACKS18. MP/MIC INPUT7. AUDIO/VIDEO 16 IN8. 7.1 CH INPUT9. XM MODULE INPUT(AH) DAB MODULE INOUT(C,CT) 10. RS-23

20、211. SOFT CLIPPING12. +12V TRIGGER OUT13. IR IN/OUT14. HDMI15. ZONE 2,3,4 16. AUDIO PREOUT17. SPEAKERS A, SPEAKER B18. AC POWER INLET19. SWITCHED AC OUTLET20. POWER7DISASSEMBLY INSTRUCTIONS1. Remove machine screws M4.0 x 8.0 (x8 pcs) from the side panels. Remove tapping screw 3.5 x 8.0 (x4 pcs) from

21、 the back panel. Refer to Figure No. 1. 2. Pull both sides of the TOP COVER slightly outwards and tilt approx. 35 and then remove in the direction as indicated. Refer to Figure No. 2. Figure No. 1Figure No. 28WIRING DIAGRAM9WIRING DIAGRAM PARTS LISTItem Database Part Number Description Remark 1 17-0

22、12-2965-90 CABLE ASSY 4 WAYS #26 2.5P L=400mm (RoHS) PSU BD-J8002A2 17-012-3943-90 CABLE ASSY 1 WAY #16 UL1672 BLUE L=140mm PSU BD-J8011 FASTON 4.8mm (RoHS) 3 17-012-3944-90 CABLE ASSY 1 WAY #16 UL1672 BROWN L=140mm PSU BD-J8012 FASTON 4.8mm (RoHS) 4 17-012-3940-90 CABLE ASSY 3 WAYS #26 2.5P UL2854

23、L=110 (ROHS) VOL BD- J6004A/B5 17-012-3938-90 CABLE ASSY 1 WAY #18 UL1007 L=320MM DSP BD-J1002A W/ HEADER (RoHS) 6 17-012-3378-90 CABLE ASSY 20 WAYS #28 UL2651 L=240mm KEYBOARD- PCB MOUNT (RoHS) J2002B7 17-012-3173-90 CABLE ASSY 14 WAYS #26 2.5P UL1533 L=100 (RoHS) PRE-OUT BD- J5404B8 17-012-3176-90

24、 CABLE ASSY 3 WAYS #18 3.96P UL1007 L=80 (RoHS) SEC BD-J5402B9 17-012-3603-90 CABLE ASSY 2 WAYS #18 UL1007 L=170MM (RoHS) SEC BD- J8105A,J8106A10 17-012-3604-90 CABLE ASSY 6 WAYS #18 UL1007 L=140MM (RoHS) SEC BD-J8104A11 17-012-3174-90 CABLE ASSY 5 WAYS #18 3.96P UL1007 L=300mm SPK BD- (W/R/B/V/O) (

25、RoHS) J5403B1-B512 17-012-3947-90 CABLE ASSY 4 WAYS #18 3.96P UL1007 L=260 SPK BD- (W/R/Y/BL) (RoHS) J5802B1-B413 17-012-3329-90 CABLE ASSY 3 WAYS #18 UL1007 3.96P L=420 (RoHS) SPK BD- J8106B1-B314 17-012-3330-90 CABLE ASSY 4 WAYS #18 UL1007 3.96P L=440 (RoHS) SPK BD- J8105B1-B415 17-012-3171-90 CAB

26、LE ASSY 6 WAYS #26 2.5P UL1533 L=200 (RoHS) V6 VD-J2006B16 17-012-3404-90 CABLE ASSY 6 WAYS #26 2.5P UL1007 L=150 (RoHS) V6 BD-J2005B17 17-012-3939-90 CABLE ASSY 3 WAYS #26 2.5P UL2468 L=180 (RoHS) ISC-L BD- J5803B, ISC-R BD- J5810B18 17-012-3930-90 CABLE ASSY 4 WAYS #26 2.5P UL1533 L=160 (RoHS) V6

27、BD-J2008A19 17-012-3936-90 CABLE ASSY 3 WAYS #26 2.5P UL2854 L=310 (RoHS) CONN#1-J9006A20 17-012-3937-90 CABLE ASSY 5 WAYS #26 2.5P UL2854/1533 CONN#1- L=230/320 (RoHS) J9004A/J9005A21 17-012-3938-90 CABLE ASSY 1 WAY #18 UL1007 L=320 W/ HEADER CONN#1- (RoHS) JP9001A22 17-012-3941-90 CABLE ASSY 3 WAY

28、S #26 2.5P UL2854 L=130 (RoHS) CONN#1- J9008A/B23 17-012-3457-90 CABLE ASSY 8 WAYS #26 UL1007 2.5P L=120 (RoHS) CONN#2-J8202B24 17-012-3458-90 CABLE ASSY 10 WAYS #26 UL1007 2.5P L=80 (RoHS) CONN#2-J8201B25 17-010-0124-90 FFC CABLE 17 PINS P1.25 L=180 15 & 16 PINS VOID TUNER-J5404B (RoHS)26 17-012-28

29、74-90 CABLE ASSY 1 WAY #16 UL1672 BLUE L=100mm J8015,J8017 (RoHS) 27 17-012-2875-90 CABLE ASSY 1 WAY #16 UL 1015 GREEN/YELLOW CHASSIS GND, L=100 (RoHS) AC OUTLET GND28 17-012-3166-90 CABLE ASSY 20 WAYS #28 UL2651 L=100mm (RoHS) J2001C29 17-012-3298-90 CABLE ASSY 3 WAYS #18 UL1007 L=420mm (RoHS) J540

30、2A/B30 17-012-3346-90 CABLE ASSY 26 WAYS #28 UL2651 L=330mm (RoHS) J2301C31 17-012-3942-90 CABLE ASSY 26 WAYS #28 UL2651 L=230mm (RoHS) J2007C32 17-012-3948-90 CABLE ASSY 1 WAY #16 UL1672 BROWN L=100 J8013,J8016 (RoHS) 33 17-012-3963-90 CABLE ASSY 1 WAY #18 UL1007 L=200 W/ HEADER TUNER-J6102A (RoHS)

31、 34 17-012-4020-90 CABLE ASSY 3 WAYS #26 2.5P UL2547 L=300 (RoHS) TUNER-J9501A35 17-012-4021-90 CABLE ASSY 1 WAY AWG18 UL1007 BLACK L=200mm MAIN-JP7006B- W/INT. TEETH RING TERMINAL (RoHS) GND, SEC BD-GND36 17-012-3605-90 CABLE ASSY 6 WAYS #18 UL1007 L=170MM SEC BD-J8103A37 17-012-3573-90 CABLE ASSY

32、20 WAYS #28 UL2651 L=130mm (RoHS) J7001C10BLOCK DIAGRAM11SPECIAL FUNCTIONFunction Keys NotesFactory Reset AH Source Down + Front/MP Factory Reset C Source UP + Front/MP Toggle IR Channel Source Down + Power Only for v1.08 or higher.Check MCU Version Source Down + Source UP For v1.03 or higher, this

33、checks all versions.Check DSP Version Source Down + Listening Mode Only for v1.02 or older.Check Current Video Mode Source Down + Tone Controls MIC Test Source Down + Tone Defeat VFD Test Source Down + Display PAL/NTSC Source Down + Memory DAB/XM Source Down + Tuner Band Must cycle power before chan

34、ge takes effect.9k/10k Source UP + Tuner Band Must reselect AM before change takes effect.XM 1kHz Test Tone Tuner Band + Tuner Mode XM must be selected first.XM Signal Strength Tuner Mode for 0.5 seconds XM must be selected first.XM Diagnostics Mode Tuner Mode for 3 seconds XM must be selected first

35、.Check DAB Module Version Tuner Mode for 3 seconds DAB must be selected first.Enter Diagnostics Mode Source Down + EnterDiagnostic Mode Down Source Down + Cursor RightDiagnostic Mode Up Source Down + Cursor LeftPower Off All Zones Power Toggle or Power Off for 3 seconds12DETAILS & WAVEFORMS ON SYSTE

36、M TEST & DEBUGGING DSP U1007 Pin 70 - Clock for external memory, 100MHz U1007 Pin 17 - X1001C output, 24.576MHz U1007 Pin 2 - Master clock (Analog), 12.288MHz U1007 Pin 2 - Master clock (PCM), 11.2896MHz U1007 Pin 12 Left/Right clock (Analog), 48kHz U1007 Pin 12 - Left/Right clock (PCM), 44.1kHz 13U

37、1007 Pin 9 - Serial clock (Analog), 3.072MHz MCU U2001 Pin 12 - X2001A output, 20.000MHz HDMI U12 Pin 38 U3 output, 28.636MHz 14U9 Pin 1 DAC_HS (OSD Off), 31.48kHz U9 Pin 54 DAC_VS (OSD On, NTSC), 60Hz U9 Pin 1 DAC_HS (OSD On), 15.72kHz U9 Pin 54 DAC_VS (OSD On, PAL), 50Hz U9 Pin 54 DAC_VS (OSD Off)

38、, 60Hz U9 Pin 4 DAC_FLD (OSD Off), Idle 15U9 Pin 4 DAC_FLD (OSD On, NTSC), 30Hz U9 Pin 51 PCLK (OSD On), 27MHz U9 Pin 4 DAC_FLD (OSD On, PAL), 25Hz U9 Pin 51 PCLK (OSD Off), 27MHz 16ADJUSTMENT POINT DIAGRAMLEFT CHANNEL AMPLIFIER BOARDRIGHT CHANNEL AMPLIFIER BOARD ISC-L BOARD17AMPLIFIER ADJUSTMENTIdl

39、e Current1. Rotate R5221 fully clockwise.2. Connect DC millivoltmeter to P5501 (i.e. Across half of R5228 and R5530, 0.22 Ohm resistor).3. Turn on the unit.4. Adjust R5221 for 2mV +/- 0.2mV reading on voltmeter.5. Leave power on for at least 5 min, and check for idle current again.6. Repeat for othe

40、r channels.CHANNEL JUMPER VRFL P5501 R5521FR P5001 R5021C P5101 R5121SL P5601 R5621SR P5201 R5221BS P5701 R5721BSR P5301 R5321ISC adjustmentA. Rotate R8203 fully clockwiseB. Use 500mV, 1kHz sine wave, EXT 7.1 input, 8 loading to all channelsC. Increase the output power of FL/SL/BSL channels to 120W

41、(31V)D. Note the THD readings should be larger than 0.2%E. Rotate R8203 anti-clockwise slowly until the THD reading is below 0.1%F. Repeat for R8303 using FR/SR/BSR/C channels. ISC-R BOARD18PCB LAYOUTPOWER AMPLIFIERLEFT_CH BOARD-COPPER SIDE19LEFT_CH BOARD - COMPONENT SIDE20RIGHT_CH BOARD-COPPER SIDE

42、21RIGHT_CH BOARD-COMPONENT SIDE22DSP BOARD - COPPER SIDE23DSP BOARD - COMPONENT SIDE24KEY BOARD - COMPONENT SIDE KEY BOARD - COPPER SIDE 25PRE-OUT BOARD- COPPER SIDE26PRE-OUT BOARD-COMPONENT SIDE27VOLUME BOARD - COPPER SIDE28VOLUME BOARD - COMPONENT SIDE29F-INPUT BOARD - COPPER SIDEF-INPUT BOARD - C

43、OMPONENT SIDE30MAIN BOARD -COMPONENT SIDE31TRIGGER BOARD - COMPONENT SIDETRIGGER BOARD - COPPER SIDE32COMPONENT BOARD-COMPONENT SIDECOMPONENT BOARD-COPPER SIDE33VIDEO BOARD - COPPER SIDEVIDEO BOARD - COMPONENT SIDE34HDMI BOARD-COPPER SIDE35HDMI BOARD-COMPONENT SIDE36PSU-ISC-L BOARD-COMPONENT SIDEPSU

44、-ISC-R BOARD-COPPER SIDE37CONNECTOR 1 BOARD-COMPONENT SIDECONNECTOR 1 BOARD-COPPER SIDE38MCU BOARD-COMPONENT SIDEMCU BOARD-COPPER SIDE39PSU-SECONDARY BOARD-COMPONENT SIDEPSU-STD BOARD-COMPONENT SIDE40CONNECTOR-3 BOARD-COMPONENT SIDECONNECTOR-4 BOARD-COMPONENT SIDESPEAKER BOARD-COMPONENT SIDE41CONNEC

45、TOR-2 BOARD-COMPONENT SIDE42POWER AMPLIFIER RIGHT-CHFRSRCEN.SBRFR(A)FR(B)CENTERSRSBRQ50062SB1275ECBQ5001MMBT5551LT1ECBQ5002MMBT5551LT1ECBQ5003MMBT5551LT1ECBQ5004MMBT5551LT1R50024701/4WR500310kR5001100k1/4WR50051kR50091kR500722R501122R50082701/4WR5013470ECBQ5005MMBT5551LT1R500647kD5002GS1GD5003GS1GC5

46、0022.2u 50VR500427k1/4WC5001100u50VR50123601/4WC5004470u16VQ50072SB1275R5010470R501447D5004LL4148Q5008MMBT5401LT1Q50092SB1275D5005LL4148D5006LL4148C5007100pC500510pC500610pC5008100pR501510kQ50102SD1918ECBQ5011MMBT5551LT1R501647D5007LL4148D5008LL4148Q5012MMBT5551LT1R501756k1/4WR50192kR50201kC50100.1u

47、 50V123R50211kC500947u100VC501147u100VR5018471/2WC5012100p100VC5015100p100VC5013100pC5014100pR5036102WC50180.1u_M 100VR50353.31WL50010.2uHD500115V1/4WR5022471/2WR50280.225WR50300.225WQ5019MMBT5551LT1R503110kR503433kR503320kD5009LL4148R5032330kR5037180kR5137180kR5132330kD5109LL4148R513320kR513433kR51

48、3110kQ5119MMBT5551LT1R51300.225WR51280.22 5WR5122471/2WD510115V1/4WL51010.2uHR51353.31WC51180.1u_M 100VR5136102WC5114100pC5113100pC5115100p100VC5112100p100VR5118471/2WC511147u100VC510947u100V123R51211kC51100.1u 50VR51201kR51192kR511756k1/4WQ5112MMBT5551LT1D5108LL4148D5107LL4148R511647ECBQ5111MMBT555

49、1LT1Q51102SD1918R511510kC5108100pC510610pC510510pC5107100pD5106LL4148D5105LL4148Q51092SB1275Q5108MMBT5401LT1D5104LL4148R511447R5110470Q51072SB1275C5104470u16VR51123601/4WC5101100u50VR510427k1/4WC51022.2u 50VD5103GS1GD5102GS1GR510647kECBQ5105MMBT5551LT1R5113470R51082701/4WR511122R510722R51091kR51051k

50、R5101100k1/4WR510310kR51024701/4WECBQ5104MMBT5551LT1ECBQ5103MMBT5551LT1ECBQ5102MMBT5551LT1ECBQ5101MMBT5551LT1Q51062SB1275R5237180kR5232330kD5209LL4148R523320kR523433kR523110kQ5219MMBT5551LT1R52300.225WR52280.22 5WR5222471/2WD520115V1/4WL52010.2uHR52353.31WC52180.1u_M 100VR5236102WC5214100pC5213100pC