Nad-T-755-Service-Manual(1) 电路图 维修手册.pdf

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1、NAD SERVICE MANUAL T 755 T 755 Surround Sound Receiver Surround Sound Receiver DRAFT DATE: AUGUST 2009RadioFans.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. NAD ELECTRONICS INTERNATIONAL 633 GRANITE COURT, PICKERING,ON, CANADA L1W 3K1 MODEL T755 AV SURROUND SOUND RECEIVER POWER RATING 120V60Hz

3、6A DESIGNED & ENGINEERED IN CANADA, CUSTOM MANUFACTURED TO NAD SPECIFICATIONS IN CHINA MODEL T755 AV SURROUND SOUND RECEIVER NAD ELECTRONICS INTERNATIONAL POWER RATING 230V50Hz 3A DESIGNED & ENGINEERED IN CANADA, CUSTOM MANUFACTURED TO NAD SPECIFICATIONS IN CHINA RadioFans.CN 收音机爱 好者资料库 3 SERVICE SA

4、FETY PRECAUTIONS 1. Replacing the fuses CAUTION: FOR CONTINUED PROTECTION AGAINST THE RISK OF FIRE REPLACE ONLY WITH SAME TYPE OF FUSE. Reference Designator Database Part Number Description F8001*AH 20-001-0072-90 FUSE TIME-LAG 6.3A 250VAC 5X20mm TSD UL/CSA/VDE/CCC WALTER F8001*C,CT 20-001-0072-90 F

5、USE 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 TSD 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.

6、2. Safety check out (Only U.S.A. model) 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 - 9 BLOCK DIAGRAM.10 SPECIAL FUNCTION

7、.11 DETAILS & WAVEFORMS ON SYSTEM & TEST & DEBUGGING.11-12 ADJUSTMENT POINTS DIAGRAM / AMPLIFIER ADJUSTMENT .13 PCB LAYOUT .14- 28 SCHEMATIC DIAGRAM .29-47 ELECTRICAL PARTS LIST .48-67 IC BLOCK DIAGRAM .68-86 EXPLODED VIEW .87-88 EXPLODED VIEW PARTS LIST .89-91 SINGLE AMPLIFIER CHANNEL REPAIR KIT .9

8、2-93 PACKING DIAGRAM .94 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) 0.1 % Input Sensitivity (ref. 8 ohms, 1 kHz) 1 0.1 V S/N Ratio (A-wtd, 1k

9、Hz, 1 W, 8 ohm, FL/C/FR/SL/SR) - 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 input, 1 W, 1 kHz) -54 dB Controls Bas

10、s (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 dB C Track 44 200 - 20 kHz 0.8 dB Harmo

11、nic 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 Channel Separation (1 W, 20 kHz LPF) Tr

12、ack 65 997 Hz 55 dB DOLBY PRO LOGIC II SECTION Frequency Resporse 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 dB 20 kHz 0 2.0 dB S/N Ratio (200 mV in,

13、 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 0.5 -0.2/+0.8 W Channel Difference (FL

14、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 1.5 dB AM TUNER SECTION Input level is

15、 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 -20/+30 mV Loop sensitivity (20 dB S/N)

16、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 15 dBv S/N Ratio (60 dB, IHF wtd) Mono

17、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 dB AM Suppression (60 dB, 100% Mod. FM,

18、 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 dB 15 dB RDS decode Sensitivity 26 dB

19、PHYSICAL SPECIFICATIONS Dimensions (Width x Height x Depth) 435 x 160 x 393 mm Net Weight 17.9 Kg (39.38 lbs) Shipping Weight 22.7 Kg (49.94 lbs) 6 FRONT PANEL REAR PANEL / FRONT PANEL VIEW REAR PANEL 1. IR IN/OUT 2. +12V TRIGGER OUT 3. SOFT CLIPPING 4. FM,AM ANTENNA INPUT 5. XM MODULE INPUT(AH) DAB

20、 MODULE INOUT(C,CT) 6. MP DOCK 1. POWER BUTTON 2. STANDBY LED 3. INFO 4. AM/FM/DB 5. TUNER MODE 6. MEMORY 7. NAVIGATION AND ENTER BUTTON 8. VACUUM FLUORESCENT DISPLAY(VFD) 9. REMOTE SENSOR 10. VOLUME 11. SPEAKERS A, B 12. SOURCE 13. LISTENING MODE 14. TONE CONTROLS 15. TONE DEFEAT 16. FRONT INPUT/MP

21、 17. PHONES 18. FRONT INPUT JACKS 19. MC/MIC INPUTS 7. RS-232 8. COMPONENT IN/OUT 9. AUDIO/VIDEO 16 IN 10. AUDIO/VIDEO 3/4 OUT 11. MONITOR(S-VIDEO,VIDEO) 12. ZONE 2 13. 7.1 CH INPUT 14. AUDIO PREOUT 15. DIGITAL AUDIO IN/OUT 16. HDMI 17. SPEAKERS A, SPEAKER B 18. AC POWER INLET 19. SWITCHED AC OUTLET

22、 20. POWER 7 DISASSEMBLY INSTRUCTIONS 1. Remove machine screws M4.0 x 8.0 (x 6pcs) from the side panels. Remove tapping screw 3.0 x 8.0 (x 4pcs) 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 remove in the direction as i

23、ndicated. 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 17-012-3379-90 CABLE ASSY 2 WAYS AWG18 3.96P UL1007 MAIN BD- L=250mm(RoHS) J7004A 2 17-012-3380-90 CABLE ASSY 3 WAYS AWG18 3.96P UL1007 MAIN BD- L=25

24、0mm(RoHS) J7005A 3 17-012-3382-90 CABLE ASSY 10 WAYS AWG26 2.5P UL1533 MAIN BD- L=300mm(RoHS) J6005A 4 17-012-3575-90 CABLE ASSY 5 WAYS AWG18 3.96P UL1007 MAIN BD- L=230mm (RoHS) J7003A 5 17-012-3579-90 CABLE ASSY 6 WAYS AWG26 2.5P UL1533 MAIN BD- L=80mm (RoHS) J2006A 6 17-012-3974-90 CABLE ASSY 10W

25、AYS AWG#26 2.5P UL1007 MAIN BD- L=110mm BOTH SIDE SOLDER (RoHS) J6010A/B 7 17-012-4274-90 CABLE ASSY 12 WAYS AWG26 2.5P UL1533 MAIN BD- 2.5P L=350mm (RoHS) J4002A 8 17-012-4275-90 CABLE ASSY 8 WAYS AWG26 UL1533 2.5P MAIN BD- L=140mm (RoHS) J2009A 9 17-012-3571-90 CABLE ASSY 4 WAYS AWG26 2.5P L=120mm

26、 PSU BD- (RoHS) J2008B 10 17-012-3943-90 CABLE ASSY 1 WAY AWG16 UL1672 BLUE PSU BD- L=140mm FASTON 4.8mm (RoHS) J8011 11 17-012-3944-90 CABLE ASSY 1 WAY AWG16 UL1672 BROWN PSU BD- L=140mm FASTON 4.8mm (RoHS) J8012 12 17-012-3578-90 CABLE ASSY 3 WAYS AWG18 3.96P UL1007 SURR AMP BD- L=120mm (RoHS) J50

27、03B 13 17-012-2956-90 CABLE ASSY 1 WAY AWG18 UL1007 BLACK DSP BD- L=100mm W/ RING TERMINAL J6010A 14 17-012-3971-90 CABLE ASSY 20 WAYS AWG28 UL2651 L=120mm KEY BD- PCB MOUNT (RoHS) J2002B 15 17-012-2956-90 CABLE ASSY 1 WAY AWG18 UL1007 BLACK SPK BD- L=100mm W/ RING TERMINAL J8001 16 17-012-3383-90 C

28、ABLE ASSY 5 WAYS AWG=18 3.96P UL1007 SPK BD- L=350mm(V/B/Y/O/R)(RoHS) J7006 17 17-012-3576-90 CABLE ASSY 3 WAYS AWG18 3.96P UL1007 SPK BD- L=420mm (RoHS) J5602 18 17-012-3577-90 CABLE ASSY 5 WAYS AWG18 3.96P UL1007 SPK BD- L=340/380/400mm (RoHS) J5304 19 17-012-3385-90 CABLE ASSY 26 WAYS AWG28 UL265

29、1 L=150mm TRIGGER BD- PCB MOUNT(RoHS) J2007B 20 17-012-4276-90 CABLE ASSY 20 WAYS AWG28 UL2651 L=200mm COMP.VID. BD- PCB MOUNT (RoHS) J4001B 21 17-012-3168-90 CABLE ASSY 10 WAYS AWG26 UL1007 2.5P HDMI BD- L=160mm (RoHS) J4306A 22 17-012-2956-90 CABLE ASSY 1 WAY AWG18 UL1007 BLACK FRONT INPUT L=100mm

30、 W/ RING TERMINAL BD-J9301 23 17-012-2874-90 Cable assy 1 way AWG=16 UL 1672 blue L=100mm J8017,J8019 (RoHS) 24 17-012-2875-90 CABLE ASSY 1 WAY AWG16 UL 1015 CHASSIS GND, GREEN/YELLOW L=100mm (RoHS) AC OUTLET GND 25 17-012-3572-90 CABLE ASSY 20 WAYS AWG28 UL2651 L=80mm J2005C (RoHS) 26 17-012-3573-9

31、0 CABLE ASSY 20 WAYS AWG28 UL2651 L=130mm J2001C (RoHS) 27 17-012-3948-90 CABLE ASSY 1 WAY AWG16 UL1672 BROWN J8016,J8018 L=100mm (RoHS) 28 17-010-0165-90 FFC CABLE 17 PINS P1.25 L=80MM (RoHS) J6003C 10 BLOCK DIAGRAM 11 SPECIAL FUNCTION Function Keys Notes Factory Reset AH Source Down + Front/MP Fac

32、tory Reset C Source UP + Front/MP Toggle IR Channel Source Down + Power Check MCU & DSP Version Source Down + Source UP Check Current Video Mode Source Down + Tone Controls MIC Test Source Down + Tone Defeat VFD Test Source Down + INFO PAL/NTSC Source Down + Memory DAB/XM Source Down + Tuner Band Mu

33、st cycle power before change 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 fi rst. XM Signal Strength Tuner Mode for 0.5 seconds XM must be selected fi rst. XM Diagnostics Mode Tuner Mode for 3 s

34、econds XM must be selected fi rst. Check DAB Module Version Tuner Mode for 3 seconds DAB must be selected fi 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

35、3 seconds DETAILS & WAVEFORMS ON SYSTEM TEST & DEBUGGING U1001 Pin 17 - X1001C output, 24.576MHz U1001 Pin 2 - Master clock (Analog), 12.288MHz U1001 Pin 70 - Clock for external memory, 100MHz U1001 Pin 2 - Master clock (PCM), 11.2896MHz U1001 Pin 12 - Left/Right clock (Analog), 48kHzU1001 Pin 12 -

36、Left/Right clock (PCM), 44.1kHz 12 U1001 Pin 9 - Serial clock (Analog), 3.072MHzU1001 Pin 9 - Serial clock (PCM), 2.8224MHz U2001 Pin 12 - X2001A output, 20.000MHzU4520 Pin 7 - X4503 output, 13.500MHz U4507 Pin 75 - X4501 output, 14.31818MHz 13 AMPLIFIER ADJUSTMENT Idle Current 1. Rotate R5018 fully

37、 anti-clockwise. 2. Connect DC millivoltmeter to P5001. 3. Turn on the unit. 4. Adjust R5018 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 P5001 R5018 FR P5101 R5118 C P5201 R5218 SL

38、P5401 R5418 SR P5501 R5518 ISC Adjustment A. Rotate R5634 fully clockwise. B. Use 500mV, 1kHZ sine wave, EXT7.1 input, 8ohm loading to all channels. C. Increase the output power of each channels to 80W(25.3V). D. Note the THD readings should be larger than 0.2%. E. Rotate R5624 anti-clockwise slowly

39、 until the THD readings is below 0.1%. ADJUSTMENT POINT DIAGRAM LEFT/RIGHT CHANNEL AMPLIFIER BOARD 14 PCB LAYOUT POWER AMPLIFIER FRONT AMP BOARD-COPPER SIDE 15 FRONT AMP BOARD-COMPONENT SIDE 16 SURROUND AMP BOARD-COPPER SIDE 17 SURROUND AMP BOARD-COMPONENT SIDE 18 DSP BOARD - COPPER SIDE 19 DSP BOAR

40、D - COMPONENT SIDE 20 KEY BOARD - COMPONENT SIDEKEY BOARD - COPPER SIDE 21 F-VIDEO BOARD - COPPER SIDE F-VIDEO BOARD - COMPONENT SIDE 22 MAIN BOARD -COMPONENT SIDE 23 MAIN BOARD -COPPER SIDE 24 TRIGGER BOARD - COMPONENT SIDE TRIGGER BOARD - COPPER SIDE SPEAKER BOARD - COMPONENT SIDE 25 COMPONENT BOA

41、RD-COMPONENT SIDE COMPONENT BOARD-COPPER SIDE 26 HDMI BOARD-COPPER SIDE 27 HDMI BOARD-COMPONENT SIDE 28 PSU-STD BOARD-COMPONENT SIDE CONNECTOR-3 BOARD-COMPONENT SIDE 29 SCHEMATIC DAIGRAM CONNECTOR-3 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 J5801B to AMP-L (J5801A) 1

42、 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 J5401B to AMP-R (J5401A) PO_FL I_GND PO_SL PO_BSL I_GND I_GND ISC_SEN_R RELAY_B RELAY_F SC_2 SC_1 THM_PRO ISC_THM_R I_DET V_DET OVLD_PRO FAN_SEN +15V RELAY_S RELAY_SB RELAY_C 4094_CLK 4094_DATA 4094(1)_STB +5V_K DGND PO_FL I_GND PO_SL I_GND PO_BSL I_GND ISC_SEN_R RELAY_B RELAY_F SC_2 SC_1 THM_PRO ISC_THM_R I_DET V_DET OVLD_PRO FAN_SEN +15V RELAY_S RELAY_SB RELAY_C 4094_CLK 4094_DATA 4094(1)_STB +5V_K DGND +12V_D+12V_D 30 POWER SUPPLY(STAND BY) POWER TRANSFORMER TO POWER SWITC