Nad-T-775-Service-Manual(1) 电路图 维修手册.pdf

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1、NAD SERVICE MANUALT 775 T 775 Surround Sound Receiver Surround Sound Receiver DRAFT DATE: AUGUST 2009 RadioFans.CN 收音机爱 好者资料库 2 SAFETY INFORMATION Manufactured 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

2、worldwide 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. 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 REP

3、LACE ONLY WITH SAME TYPE OF FUSE. Reference Designator Database Part Number Description F8001*AH 20-001-0078-90 FUSE TIME-LAG 10A/250VAC 5X20mm UL/CSA 5T F8001*C,CT 20-001-0072-90 FUSE TIME-LAG 6.3A 250VAC 5X20mm TSD UL/CSA/VDE/CCC WALTER F8002*AH 20-001-0076-90 FUSE 1.6A 250V TIME LAG LBC 5x20mm TS

4、D UL/CSA/VDE/SEMKO F8002*C,CT 20-001-0069-90 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 resistanc

5、e measurements to determine that exposed parts are acceptably insulated from supply circuit. CONTENTS DESCRIPTION PAGE SPECIFICATIONS .4 - 5 REAR PANEL / FRONT PANEL VIEW .6 DISASSEMBLY INSTRUCTIONS .7 WIRING DIAGRAM .8 - 9 BLOCK DIAGRAM.10 SPECIAL FUNCTION .11 DETAILS & WAVEFORMS ON SYSTEM & TEST &

6、 DEBUGGING.12-15 ADJUSTMENT POINTS DIAGRAM / AMPLIFIER ADJUSTMENT .16 PCB LAYOUT .17- 40 SCHEMATIC DIAGRAM .41-67 ELECTRICAL PARTS LIST .68-92 IC BLOCK DIAGRAM .93-117 EXPLODED VIEW .118-119 EXPLODED VIEW PARTS LIST .120-123 SINGLE CHANNEL SERVICE KIT .124-125 PACKING DIAGRAM .126 Parts marked with

7、the symbol are critical with regard to the risk of fi re and electric shock. RadioFans.CN 收音机爱 好者资料库 4 SPECIFICATIONS POWER AMPLIFIER SECTION 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/BS) 0.1 % Input Sensit

8、ivity (ref. 8 ohms, 1 kHz) 1 0.1 V S/N Ratio (A-wtd, 1kHz, 1 W, 8 ohm, SL/SR/BL) - 80 dB Frequency Response (20 Hz - 20 kHz) 0 1.0 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 % Crosst

9、alk (500 mV input, 10 W, 1 kHz) -54 dB Controls Bass (at 500 mV in, 1 W out, 100 Hz) 10 dB 2 dB Treble (at 500 mV in, 1 W out, 10 kHz) 10 dB 2 dB DOLBY DIGITAL SECTION Channel Difference (FL ref. Track 30) 1.2 dB Frequency Resporse at Dolby confi g.2 SL Track 46 200 - 20 kHz 0.8 dB SR Track 47 200 -

10、 20 kHz 0.8 dB C Track 44 200 - 20 kHz 0.8 dB Harmonic Distortion (1 W, Audio LPF, Dolby Congfi g 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

11、A-wtd 68 dB Channel Separation (1 W, 20 kHz LPF) Track 65 997 Hz 55 dB DOLBY PRO LOGIC II SECTION Frequency Response I/P mode : L, R : 1 V in, 1 W, Ch L/R 40 Hz 0 2.0 dB 20 Hz 0 2.0 dB I/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 dB I/P mode : L=-R : 1 V in, 1 W, Ch SL/SR 4

12、0 Hz 0 2.0 dB 20 kHz 0 2.0 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 60 dB I/P mode : L=R : 1 kHz, Ch C 60 dB I/P mode : L=-R : 1 kHz, Ch SL/SR 60 dB THD (2.2 V in, 1 W, w/ 80 kHz LPF, 1 kHz) 0.2 % 5 DTS SECTION Output Level (Vol 0 dB) : FL/FR/C/SL/SR Tr

13、ack 6 1 kHz 0.5 -0.2/+0.8 W Channel Difference (FL ref) : FL/FR/C/SL/SR Track 6 1 kHz 0 1.0 dB Harmonic Distortion (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 dB Subwoofer Output Level 1 kHz ref at pre-out (FL) Play Track 10, charg

14、e to 15 12.5 1.5 dB 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) 60 dBV S/N Ratio (5 mV in) 38 dB THD (5 mV in) 3 % IF Rejection (450 kHz) 36 dB Image Rejection (F+2xIF) 28 dB Selectivity 17 dB

15、Output 170 -20/+30 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 circuit of 75-ohm source impedance signal generator Usable sensitivity (98

16、 MHz) 15 dB 15 dBv S/N Ratio (60 dB, IHF wtd) Mono 60 dB 60 dB Stereo 63 dB 63 dB Frequency Response (20 Hz - 15 kHz, 60 dB) 0 1.5 dB 0 1.5 dB Channel Separation (60 dB) 100 Hz 30 dB 30 dB 1 k 32 dB 32 dB 10 kHz 30 dB 30 dB Alternate Channel Selectivity (40 dB, 400 kHz) 60 dB 45 dB Capture Ratio (40

17、 dB) 3 dB 3 dB AM Suppression (60 dB, 100% Mod. FM, 30% Mod. AM) 48 dB 48 dB Image Rejection (119.4 MHz) 65 dB I.F. Rejection (10.7 MHz) 78 dB Pilot Suppression (98 MHz) 50 dB 50 dB THD (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

18、24 dB Off 15 dB 15 dB RDS decode Sensitivity 26 dB PHYSICAL SPECIFICATIONS Dimensions (Width x Height x Depth) 435 x 170 x 423 mm Net Weight 20.8 Kg (45.76 lbs) Shipping Weight 25.7 Kg (56.54 lbs) 6 FRONT PANEL REAR PANEL / FRONT PANEL VIEW REAR PANEL 1. DIGITAL AUDIO IN/OUT 2. HDMI 3. COMPONENT IN/

19、OUT 4. MP DOCK 5. AUDIO/VIDEO 3/4 OUT 6. MONITOR(S-VIDEO,VIDEO) 1. POWER BUTTON 2. STANDBY LED 3. INFO 4. AM/FM/DB 5. TUNER MODE 6. MEMORY 7. NAVIGATION AND ENTER BUTTON 8. VACUUM, FLUORES CENT DISPLAY(VFD) 9. VOLUME 10. SPEAKER A/B 11. SOURCE 12. LISTENING MODE 13. TONE CONTROLS 14. TONE DEFEAT 15.

20、 FRONT INPUT/MP 16. PHONES 17. FRONT INPUT JACKS 18. MP/MIC INPUT 7. AUDIO/VIDEO 16 IN 8. 7.1 CH INPUT 9. XM MODULE INPUT(AH) DAB MODULE INOUT(C,CT) 10. RS-232 11. FM,AM ANTENNA INPUT 12. SOFT CLIPPING 13. +12V TRIGGER OUT 14. IR IN/OUT 15. ZONE 2,3,4 16. AUDIO PREOUT 17. SPEAKERS A, SPEAKER B 18. A

21、C POWER INLET 19. SWITCHED AC OUTLET 20. POWER 7 DISASSEMBLY INSTRUCTIONS 1. 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. ? ? ? ? ? ? ? ? ? ? 2. Pull both sides of the TOP COVER slightly outwards

22、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 ? ? ? Figure No. 2 8 WIRING DIAGRAM 9 WIRING DIAGRAM PARTS LIST Item Database Part Number Description Remark 1 17-012-2965-90 CABLE ASSY 4 WAYS #26 2.5P L=400mm PSU BD-J8002A 2 1

23、7-012-3943-90 CABLE ASSY 1 WAY #16 UL1672 BLUE PSU L=140mm FASTON 4.8mm BD-J8011 3 17-012-3944-90 CABLE ASSY 1 WAY #16 UL1672 BROWN PSU L=140mm FASTON 4.8mm BD-J8012 4 17-012-3940-90 CABLE ASSY 3 WAYS #26 2.5P UL2854 VOL L=110 BD-J6004A/B 5 17-012-3938-90 CABLE ASSY 1 WAY #18 UL1007 L=320MM DSP W/ H

24、EADER BD-J1002A 6 17-012-3378-90 CABLE ASSY 20 WAYS #28 UL2651 L=240mm KEYBOARD PCB MOUNT -J2002B 7 17-012-3173-90 CABLE ASSY 14 WAYS #26 2.5P UL1533 PRE-OUT L=100 BD-J5404B 8 17-012-3176-90 CABLE ASSY 3 WAYS #18 3.96P UL1007 SEC L=80 BD-J5804B 9 17-012-3208-90 CABLE ASSY 4 WAYS #18 3.96p UL1007 SEC

25、 BD- L=150 J8101A,J8102A 10 17-012-3209-90 CABLE ASSY 4 WAYS #18 3.96P UL1007 SEC BD- L=170 J8103A+J8104A 11 17-012-3174-90 CABLE ASSY 5 WAYS #18 3.96P UL1007 SPK BD- L=300mm (W/R/B/V/O) J5403B1-B5 12 17-012-3947-90 CABLE ASSY 4 WAYS #18 3.96P UL1007 L=260 SPK BD- (W/R/Y/BL) J5802B1-B4 13 17-012-332

26、9-90 CABLE ASSY 3 WAYS #18 UL1007 3.96P L=420 SPK BD- J8106B1-B3 14 17-012-3330-90 CABLE ASSY 4 WAYS #18 UL1007 3.96P L=440 SPK BD- J8105B1-B4 15 17-012-3171-90 CABLE ASSY 6 WAYS #26 2.5P UL1533 L=200 V6 VD- J2006B 16 17-012-3404-90 CABLE ASSY 6 WAYS #26 2.5P UL1007 L=150 V6 BD- J2005B 17 17-012-393

27、9-90 CABLE ASSY 3 WAYS #26 2.5P UL2468 L=180 ISC BD- J5803B,J5810B 18 17-012-3930-90 CABLE ASSY 4 WAYS #26 2.5P UL1533 L=160 V6 BD- J2008A 19 17-012-3936-90 CABLE ASSY 3 WAYS #26 2.5P UL2854 L=310 CONN#1- J9006A 20 17-012-3937-90 CABLE ASSY 5 WAYS #26 2.5P UL2854/1533 CONN#1- L=230/320 J9004A/J9005A

28、 21 17-012-3938-90 CABLE ASSY 1 WAY #18 UL1007 L=320 CONN#1- W/ HEADER JP9001A 22 17-012-3941-90 CABLE ASSY 3 WAYS #26 2.5P UL2854 L=130 CONN#1- J9008A/B 23 17-012-3457-90 CABLE ASSY 8 WAYS #26 UL1007 2.5P L=120 CONN#2- J8202B 24 17-012-3458-90 CABLE ASSY 10 WAYS #26 UL1007 2.5P L=80 CONN#2- J8201B

29、25 17-010-0122-90 FFC CABLE 17 PINS P1.25 L=360 15 & 16 TUNER- PINS VOID J5404B 26 17-012-2874-90 CABLE ASSY 1 WAY #16 UL1672 BLUE J8015,J8017 L=100mm 27 17-012-2875-90 CABLE ASSY 1 WAY #16 UL 1015 CHASSIS GND, GREEN/YELLOW L=100 AC OUTLET GND 28 17-012-3166-90 CABLE ASSY 20 WAYS #28 UL2651 L=100mm

30、J2001C,J7001C 29 17-012-3298-90 CABLE ASSY 3 WAYS #18 UL1007 L=420mm J5402A/B 30 17-012-3346-90 CABLE ASSY 26 WAYS #28 UL2651 L=330mm J2301C 31 17-012-3942-90 CABLE ASSY 26 WAYS #28 UL2651 L=230mm J2007C 32 17-012-3948-90 CABLE ASSY 1 WAY #16 UL1672 BROWN L=100 J8013,J8016 33 17-012-3963-90 CABLE AS

31、SY 1 WAY #18 UL1007 L=200 W/ HEADER TUNER- J6102A 34 17-012-3965-90 CABLE ASSY 3 WAYS #26 2.5P UL2547 L=500 TUNER- J9501A 35 17-012-2924-90 CABLE ASSY 1 WAY AWG18 UL1015 BLACK MAIN-JP7006B-GND, L=260mm W/RING TERMINAL SEC BD-J8153A-GND 10 BLOCK DIAGRAM 11 SPECIAL FUNCTION Function Keys Notes Factory

32、 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 checks all versions. Check DSP Version Source Down + Listening Mode Only for v1.02 or older. Check

33、 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 change takes effect. 9k/10k Source UP + Tuner Band Must reselect AM before change takes effect. XM 1

34、kHz Test Tone Tuner Band + Tuner Mode XM must be selected fi rst. XM Signal Strength Tuner Mode for 0.5 seconds XM must be selected fi rst. XM Diagnostics Mode Tuner Mode for 3 seconds XM must be selected fi rst. Check DAB Module Version Tuner Mode for 3 seconds DAB must be selected fi rst. Enter Di

35、agnostics Mode Source Down + Enter Diagnostic Mode Down Source Down + Cursor Right Diagnostic Mode Up Source Down + Cursor Left Power Off All Zones Power Toggle or Power Off for 3 seconds 12 DETAILS & WAVEFORMS ON SYSTEM TEST & DEBUGGING DSP U1007 Pin 70 - Clock for external memory, 100MHz U1007 Pin

36、 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 13 U1007 Pin 9 - Serial clock (Analog), 3.072MHz MCU U2001 Pin 12 - X2001A output, 2

37、0.000MHz HDMI U12 Pin 38 U3 output, 28.636MHz 14 U9 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), 60Hz U9 Pin 4 DAC_FLD (OSD Off), Idle 15 U9 Pin 4 DAC_FLD (OSD On, NTSC), 30H

38、z U9 Pin 51 PCLK (OSD On), 27MHz U9 Pin 4 DAC_FLD (OSD On, PAL), 25Hz U9 Pin 51 PCLK (OSD Off), 27MHz 16 AMPLIFIER ADJUSTMENT Idle Current 1. 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 R

39、5221 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 other channels. CHANNEL JUMPER VR FL P5501 R5521 FR P5001 R5021 C P5101 R5121 SL P5601 R5621 SR P5201 R5221 BS P5701 R5721 BSR P5301 R5321 ISC Adjustment A. Rotate R8214

40、 fully clockwise. B. Use 500mV, 1kHZ sine wave, EXT7.1 input, 8ohm loading to all channels. C. Increase the output power of FL/SL/BSL channels to 80W(25.3V). D. Note the THD readings should be larger than 0.2%. E. Rotate R8214 anti-clockwise slowly until the THDreadings is below 0.1%. F. Repeat for

41、R8217 using FR/SR/BSR/C channels. ADJUSTMENT POINT DIAGRAM LEFT/RIGHT CHANNEL AMPLIFIER BOARD SECONDARY / ISC BOARD 17 PCB LAYOUT POWER AMPLIFIER LEFT_CH BOARD-COPPER SIDE First Production runs: T71T775G00001- T71T775G00028 & T78T775G00029- T78T775G00510 Production runs: T78T775G00511 and above 18 L

42、EFT_CH BOARD - COMPONENT SIDE First Production runs: T71T775G00001- T71T775G00028 & T78T775G00029- T78T775G00510 Production runs: T78T775G00511 and above 19 RIGHT_CH BOARD-COPPER SIDE First Production runs: T71T775G00001- T71T775G00028 & T78T775G00029- T78T775G00510 Production runs: T78T775G00511 and above 20 RIGHT_CH BOARD-COMPONENT SIDE First Production runs: T71T775G00001- T71T775G00028 & T78T775G00029- T78T775G00510 Production runs: T78T775G00511 and above 21 DS