NAD-T785-avr-sm 电路图 维修手册.pdf

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1、NAD SERVICE MANUALT 785 T 785 Surround Sound Receiver Surround Sound Receiver DRAFT DATE: MARCH 2010RadioFans.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 wo

2、rldwide 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. 9 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 20-001-0078-90 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/SEMK

4、O 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 resistance measurements to

5、 determine that exposed parts are acceptably insulated from supply circuit. Parts marked with the symbol are critical with regard to the risk of fi re and electric shock. CONTENTS DESCRIPTION PAGE SPECIFICATIONS .4 - 5 REAR PANEL / FRONT PANEL VIEW .6 DISASSEMBLY INSTRUCTIONS .7 WIRING DIAGRAM .8 -

6、9 BLOCK DIAGRAM.10 SPECIAL FUNCTION .11 DETAILS & WAVEFORMS ON SYSTEM & TEST & DEBUGGING.12-15 ADJUSTMENT POINTS DIAGRAM / AMPLIFIER ADJUSTMENT .16-17 PCB LAYOUT .18-41 SCHEMATIC DIAGRAM .42-69 ELECTRICAL PARTS LIST .70-95 IC BLOCK DIAGRAM .96-120 EXPLODED VIEW .121-122 EXPLODED VIEW PARTS LIST .123

7、-126 SINGLE CHANNEL SERVICE KIT .127-128 PACKING DIAGRAM .129 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 Sensitivity (ref. 8 o

8、hms, 1 kHz) 1.46 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 % Crosstalk (500 mV

9、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 - 20 kHz 0.8

10、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 A-wtd 68 dB

11、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 40 Hz 0 2.0 d

12、B 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 Track 6 1 kHz

13、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, charge to 15 12.5

14、 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 Output 170 -

15、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 MHz) 15 dB

16、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 dB) 3 dB 3

17、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 24 dB Off 15

18、 dB 15 dB RDS decode Sensitivity 26 dB PHYSICAL SPECIFICATIONS Dimensions (Width x Height x Depth) 435 x 180 x 431 mm Net Weight 26.05 Kg (57.31 lbs) Shipping Weight 31.1 Kg (68.42 lbs) 6 FRONT PANEL REAR PANEL / FRONT PANEL VIEW REAR PANEL 1. DIGITAL AUDIO IN/OUT 2. FM,AM ANTENNA INPUT 3. COMPONENT

19、 IN/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

20、 15. 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. SOFT CLIPPING 12. +12V TRIGGER OUT 13. IR IN/OUT 14. HDMI 15. ZONE 2,3,4 16. AUDIO PREOUT 17. SPEAKERS A, SPEAKER B 18. AC POWER INL

21、ET 19. SWITCHED AC OUTLET 20. POWER 7 DISASSEMBLY INSTRUCTIONS 1. 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 the back panel. Refer to Figure No. 1. 2. Pull both sides of the TOP COVER slightly outwards and tilt approx. 35 and then rem

22、ove in the direction as indicated. 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 (RoHS) PSU BD-J8002A 2 17-012-3943-90 CABLE ASSY 1 WAY #16 UL1672 BLUE L=1

23、40mm 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 L=110 (ROHS) VOL BD- J6004A/B 5 17-012-3938-90 CABLE ASSY 1 WAY #18 UL1007 L=320MM DSP BD-J1002A W/ HEADER (RoHS) 6 17-

24、012-3378-90 CABLE ASSY 20 WAYS #28 UL2651 L=240mm KEYBOARD- PCB MOUNT (RoHS) J2002B 7 17-012-3173-90 CABLE ASSY 14 WAYS #26 2.5P UL1533 L=100 (RoHS) PRE-OUT BD- J5404B 8 17-012-3176-90 CABLE ASSY 3 WAYS #18 3.96P UL1007 L=80 (RoHS) SEC BD-J5402B 9 17-012-3603-90 CABLE ASSY 2 WAYS #18 UL1007 L=170MM

25、(RoHS) SEC BD- J8105A,J8106A 10 17-012-3604-90 CABLE ASSY 6 WAYS #18 UL1007 L=140MM (RoHS) SEC BD-J8104A 11 17-012-3174-90 CABLE ASSY 5 WAYS #18 3.96P UL1007 L=300mm SPK BD- (W/R/B/V/O) (RoHS) J5403B1-B5 12 17-012-3947-90 CABLE ASSY 4 WAYS #18 3.96P UL1007 L=260 SPK BD- (W/R/Y/BL) (RoHS) J5802B1-B4

26、13 17-012-3329-90 CABLE ASSY 3 WAYS #18 UL1007 3.96P L=420 (RoHS) SPK BD- J8106B1-B3 14 17-012-3330-90 CABLE ASSY 4 WAYS #18 UL1007 3.96P L=440 (RoHS) SPK BD- J8105B1-B4 15 17-012-3171-90 CABLE ASSY 6 WAYS #26 2.5P UL1533 L=200 (RoHS) V6 VD-J2006B 16 17-012-3404-90 CABLE ASSY 6 WAYS #26 2.5P UL1007

27、L=150 (RoHS) V6 BD-J2005B 17 17-012-3939-90 CABLE ASSY 3 WAYS #26 2.5P UL2468 L=180 (RoHS) ISC-L BD- J5803B, ISC-R BD- J5810B 18 17-012-3930-90 CABLE ASSY 4 WAYS #26 2.5P UL1533 L=160 (RoHS) V6 BD-J2008A 19 17-012-3936-90 CABLE ASSY 3 WAYS #26 2.5P UL2854 L=310 (RoHS) CONN#1-J9006A 20 17-012-3937-90

28、 CABLE ASSY 5 WAYS #26 2.5P UL2854/1533 CONN#1- L=230/320 (RoHS) J9004A/J9005A 21 17-012-3938-90 CABLE ASSY 1 WAY #18 UL1007 L=320 W/ HEADER CONN#1- (RoHS) JP9001A 22 17-012-3941-90 CABLE ASSY 3 WAYS #26 2.5P UL2854 L=130 (RoHS) CONN#1- J9008A/B 23 17-012-3457-90 CABLE ASSY 8 WAYS #26 UL1007 2.5P L=

29、120 (RoHS) CONN#2-J8202B 24 17-012-3458-90 CABLE ASSY 10 WAYS #26 UL1007 2.5P L=80 (RoHS) CONN#2-J8201B 25 17-010-0124-90 FFC CABLE 17 PINS P1.25 L=180 15 & 16 PINS VOID TUNER-J5404B (RoHS) 26 17-012-2874-90 CABLE ASSY 1 WAY #16 UL1672 BLUE L=100mm J8015,J8017 (RoHS) 27 17-012-2875-90 CABLE ASSY 1 W

30、AY #16 UL 1015 GREEN/YELLOW CHASSIS GND, L=100 (RoHS) AC OUTLET GND 28 17-012-3166-90 CABLE ASSY 20 WAYS #28 UL2651 L=100mm (RoHS) J2001C 29 17-012-3298-90 CABLE ASSY 3 WAYS #18 UL1007 L=420mm (RoHS) J5402A/B 30 17-012-3346-90 CABLE ASSY 26 WAYS #28 UL2651 L=330mm (RoHS) J2301C 31 17-012-3942-90 CAB

31、LE ASSY 26 WAYS #28 UL2651 L=230mm (RoHS) J2007C 32 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) 34 17-012-4020-90 CABLE ASSY 3 WAYS #26 2.5P UL2547 L=300 (RoHS) TUNER-J9501A 35 17-012-4021

32、-90 CABLE ASSY 1 WAY AWG18 UL1007 BLACK L=200mm MAIN-JP7006B- W/INT. TEETH RING TERMINAL (RoHS) GND, SEC BD-GND 36 17-012-3605-90 CABLE ASSY 6 WAYS #18 UL1007 L=170MM SEC BD-J8103A 37 17-012-3573-90 CABLE ASSY 20 WAYS #28 UL2651 L=130mm (RoHS) J7001C 10 BLOCK DIAGRAM 11 SPECIAL FUNCTION Function Key

33、s Notes Factory 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

34、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 change takes effect. 9k/10k Source UP + Tuner Band Must reselect AM before change tak

35、es effect. XM 1kHz 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 f

36、i rst. Enter Diagnostics 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, 1

37、00MHz 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 13 U1007 Pin 9 - Serial clock (Analog), 3.072MHz MCU U2001 Pin 12 - X

38、2001A output, 20.000MHz 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

39、 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 16 ADJUSTMENT POINT DIAGRAM LEFT CHANNEL AMPLIFIER BOARD RIGHT CHANNEL AMPLIFIER BOARD ISC-L BOARD 17 AMPLIFIER ADJUSTMENT Idle Current 1. Rotate R5221 fully clockwise. 2. Connect DC

40、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 other channels. CHANNEL JUMPER VR FL P5501 R5521 FR P50

41、01 R5021 C P5101 R5121 SL P5601 R5621 SR P5201 R5221 BS P5701 R5721 BSR P5301 R5321 ISC adjustment A. Rotate R8203 fully clockwise B. Use 500mV, 1kHz sine wave, EXT 7.1 input, 8 loading to all channels C. Increase the output power of FL/SL/BSL channels to 120W (31V) D. Note the THD readings should b

42、e 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 BOARD 18 PCB LAYOUT POWER AMPLIFIER LEFT_CH BOARD-COPPER SIDE 19 LEFT_CH BOARD - COMPONENT SIDE 20 RIGHT_CH BOARD-COPPER SIDE 21 RIGHT_CH BOARD-COMPONENT SIDE 22 DSP BOARD - COPPER SIDE 23 DSP BOARD - COMPONENT SIDE 24 KEY BOARD - COMPONENT SIDE KEY BOARD - COPPER SIDE 25 PRE-OUT BOARD- COPPER SIDE 26 PRE-OUT BOARD-COMPONENT SIDE 27 VO