Nad-T-754-Service-Manual(1) 电路图 维修手册.pdf

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1、NAD SERVICE MANUALT 754 T 754 Surround Sound Receiver Surround Sound Receiver DRAFT DATE: 08 MAY 2007RadioFans.CN 收音机爱 好者资料库 2 SAFETY INFORMATION AH VERSION C VERSION 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 FIR

2、E REPLACE ONLY WITH SAME TYPE OF FUSE. Reference DesignatorDatabase Part NumberDescription F751*AH20-001-0078-90 FUSE TIME-LAG 10A/250VAC 5X20mm UL/CSA 5T F751*C,CT20-001-0069-90 FUSE 800mA 250V TIME LAG LBC 5x20mm 5T UL/CSA/VDE/SEMKO F752*AH20-001-0076-90 FUSE 1.6A 250V TIME LAG LBC 5x20mm 5T UL/CS

3、A/VDE/SEMKO F752*C,CT20-001-0072-90 FUSE TIME-LAG 6.3A/250VAC 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 exposed

4、parts are acceptably insulated from supply circuit. CONTENTS DESCRIPTIONPAGE SPECIFICATIONS. 4 - 5 REAR PANEL / FRONT PANEL VIEW . 6 DISASSEMBLY INSTRUCTIONS . 7 WIRING DIAGRAM. 8 - 10 BLOCK DIAGRAM.11 SPECIAL FUNCTION . 12 DETAILS & WAVEFORMS ON SYSTEM & TEST & DEBUGGING . 12 ADJUSTMENT POINTS DIAG

5、RAM / AMPLIFIER ADJUSTMENT . 13 PCB LAYOUT . 14 - 29 SCHEMATIC DIAGRAM . 30 - 46 IC BLOCK DIAGRAM . 47 - 54 EXPLODED VIEW. 55 EXPLODED VIEW PARTS LIST. 56 - 58 ELECTRICAL PARTS LIST . 59 - 73 PACKING DIAGRAM . 74 Parts marked with the symbol are critical with regard to the risk of fire and electric

6、shock. Replace only with parts recommended by the manufacturer. 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

7、 ohms, 1 kHz)296 20 mV S/N Ratio(A-wtd, 1kHz, 1 W, 8 ohm, SL/SR/BL) - 75 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,

8、 10 W, 1 kHz) -57 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 config.2SL Track 46 200 - 20 kHz 0.8 dB SR Track 47 200 - 20 kHz 0.8 dB C Track

9、44 200 - 20 kHz 0.8 dB Harmonic Distortion (1 W, Audio LPF, Dolby Congfig 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 70 dB A-wtd 70 dB Channel Separa

10、tion (1 W, 20 kHz LPF)Track 65 997 Hz 60 dB DOLBY PRO LOGIC II SECTION Frequency Resporse I/P mode : L, R: 1 V in, 1 W, Ch L/R40 Hz0 2.0 dB 20 Hz0 2.0 dB I/P mode : L=R: 1 V in, 1 W, Ch /L/R40 Hz0 2.0 dB Ch C20 kHz0 2.0 dB I/P mode : L=-R: 1 V in, 1 W, Ch SL/SR40 Hz0 2.0 dB 20 kHz0 2.0 dB S/N Ratio

11、(200 mV in, 1 W, A-WTD w/ 1 k termination) I/P mode : L, R: 1 kHz, Ch L/R 65 dB I/P mode : L=R: 1 kHz, Ch C 65 dB I/P mode : L=-R: 1 kHz, Ch SL/SR 65 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 61 kHz0.3 1.3 W Channel Difference (FL r

12、ef): FL/FR/C/SL/SR Track 61 kHz 1.0 dB Harmonic Distortion (Audio Filter) : FL/FR/C/SL/SRTrack 10-14 1 kHz 0.08 % Frequency Response (20 Hz to 20 kHz)Track 26-30+2/-1.5 Subwoofer Output Level1 kHz ref at pre-out (FL)Play Track 10, charge to 1512.5 1.5 dB AM TUNER SECTION Input level is expressed as

13、the reading in open circuit of 75-ohm source impedance signal generator Usable sensitivity(999/1000 kHz) 30 dB V 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 Output170 -20/+30 mV Loop sensitivity(20 dB S/N) 999/1000 kHz 66 dB 6

14、03/600 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 dB v S/N Ratio(60 dB, IHF wtd)Mono 63 dB 63 dB Stereo 63 dB

15、63 dB Frequency Response(20 Hz - 15 kHz, 60 dB )0 1.5 dB0 1.5 dB Channel Separation(60 dB )100 Hz 30 dB 30 dB 1 k 38 dB 38 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, 30% Mod. AM) 48 dB 48 dB

16、Image Rejection(119.4 MHz) 65 dB I.F. Rejection(10.7 MHz) 78 dB Pilot Suppression(98 MHz) 60 dB 60 dB THD (60 dB, L=R 75 kHz for AH, 40 kHz Dev for C) Mono 0.25 % 0.25 % Stereo 0.35 % 0.35 % Auto-Search SensitivityOn 24 dB 24 dB Off 15 dB 15 dB RDS decode Sensitivity 26 dB PHYSICAL SPECIFICATIONS Di

17、mensions (Width x Height x Depth)435 x 170 x 423 mm Net Weight20.50 Kg (45.10 lbs) Shipping Weight24.0 Kg (52.80 lbs) 6 FRONT PANEL REAR PANEL / FRONT PANEL VIEW REAR PANEL 1.FM & AM ANTENNA 2.SOFT CLIPPING ON/OFF 3.MONITOR OUT 4.CD INPUT 5.IR INPUT & OUTPUT 6.+12V TRIGGER INPUT & OUTPUT 7.COMPONENT

18、 VIDEO IN & COMPONENT VIDEO OUT 8.DIGITAL AUDIO INPUT & DIGITAL AUDIO OUTPUT 9.POWER SWITCH 10.SWITCHED AC OUTLETS 11.AC POWER INLET 12.SPEAKERS A & B 13.DVD, SAT, VCR, VIDEO 4 & VIDEO 5 14.MAIN IN / AUDIO PRE-OUTS / SUBWOOFER OUT 15.TAPE INPUT & OUTPUT 16.MS OUT (MULTISOURCE OUT) 17.7.1 CH. INPUTS

19、1.STANDBY SWITCH 2.STANDBY LED 3.AM / FM 4.FM MUTE / MODE 5.DISPLAY 6.MEMORY 7.PRESET DOWN / UP 8.SEARCH DOWN / UP 9.VFL DISPLAY 10.VOLUME (SETUP) 11.SOURCE DOWN / UP 12.SURROUND MODE 13.LEVELS 14.TONE DEFEAT 15.TONE CONTROLS 16.SPEAKERS A & B 17.VIDEO 6 INPUT 18.PHONES 7 DISASSEMBLY INSTRUCTIONS 1.

20、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 11 and tilt approx. 35 and then remove in the direction as indicated by the arrow 12. Refer to Fig

21、ure No. 2. Figure No. 1 Figure No. 2 8 WIRING DIAGRAM KEYBOARD MAIN BOARD TRIGGER BOARD POWER SWITCH BOARD J8101B J713AJ714A J715A J719A J720A J717A J710A J711A J712A J707A J704A J502B J709A J713BJ714B J203A J204B J901B J753B VIDEO 6 INPUT BOARD J758B J757B J709B DSP BOARD J604B J715B J1009B J1010B

22、LED BOARD PSU BOARD COMPONENT VIDEO DIGITAL BOARD AUDIO BOARD VIDEO BOARD SPEAKER A SPEAKER B J1009A J1010A RS232 BOARD TUNER PRE-OUT BOARDMULTI-CHANNEL J717B J611A J612A J6101B J6101A J719B J6104A J708B J707B J350A J414B J710B J711B J712B J414A SECONDARY BOARD ISC BOARD J801A J781A J782A J582A J801

23、B J783A1 J511B J704B J3103A S-VIDEO BOARD AMP 2 BOARD (SURROUND AMP.) AMP 1 BOARD (FRONT & CENTER) J612B J502A J503A M506 J511A J581A J781B J503B J611B J801A J901A J753A J754B J751B J504A J501A J757J756 J761_NJ761_L J760 J758 J759 J203B J803A J3103B J6102B J6103B J6102A J6103A J201 J204A J6106AJ6105

24、A J350B J6106A J6105A J8101A J784A J803B J504B1 J504B3 J582A1 J582A3 J582A5 J501B1 J501B3 J501B5 J582A1 J582A3 J582A5 J701 J782A1 J782A2 J782A3 P4402 J581B THERM SENSNORTHERM SENSNOR TO MAIN BOARD TO MAIN BOARD TO MAIN BOARD TO MAIN BOARD TO MAIN BOARD 82-0426135-01-XX CABLE ASSY 4 WAYS #26 FROM TRA

25、NSFORMER UL VERSION : USE J758, J759 CE VERSION : USE J760 MOUNT ON CHASSIS GND 33 34 35 36 32 373839 31 15 30 29 28 27 2625 24 23 19 20 17 16 14 13 1211 10 8 9 21 7 6 5 4 3 2 1 18 22 9 WIRING DIAGRAM PARTS LIST ItemItemDatabase Part NumberDatabase Part NumberDescriptionDescriptionRemarkRemark 117-0

26、12-2986-90 CABLE ASSY 2 WAYS AWG=26 2.5P UL2468 L=440mm AMP1 BD-J511A 217-012-2987-90 CABLE ASSY 4 WAYS AWG=18 3.96P UL1007 L=420mm AMP1 BD-J581A 317-012-2988-90 CABLE ASSY 6 WAYS AWG=26 2.5P UL1007 L=320mm AMP1 BD-J503A 417-012-2989-90 CABLE ASSY 4 WAYS AWG=18 3.96P UL1007 L=200mm REV.B AMP2 BD-J78

27、1B 517-012-2966-90CABLE ASSY 4 WAYS AWG26 2.5P UL1533 L=450MM AUDIO BD- J3103A 617-012-2957-90 CABLE ASSY 2 WAYS AWG=26 2.5P UL1533 L=540mm DIGIT BD- J1009A 717-012-2990-90 CABLE ASSY 4 WAYS AWG=26 2.5P UL2468 L=540mm DIGITAL BD- J1010A 817-012-2956-90 CABLE ASSY 1 WAY AWG18 UL1007 BLACK L=100mm W/

28、RING TERMINAL KEYBOARD- J201 917-012-3404-90CABLE ASSY 5 WAYS AWG26 2.5P UL1007 L=160mmLED BD-J204A 1017-012-2991-90 CABLE ASSY 1 WAY AWG=18 UL1007 BLACK L=360mm W/ RING TERMINAL MAIN BD-J701 1117-012-2963-90CABLE ASSY 3 WAYS AWG=26 2.5P L=110mm MAIN BD- J6106B 1217-012-2992-90CABLE ASSY 3 WAYS AWG=

29、26 2.5P L=60mm MAIN BD- J6105B 1317-012-2964-90CABLE ASSY 3 WAYS AWG26X2C UL2547 L=210mmMAIN BD-J715A 1417-012-2974-90CABLE ASSY 8 WAYS AWG=26X3C L=480mmMAIN BD-J709A 1517-012-2993-90CABLE ASSY 10 WAYS AWG26 2.5P UL1007 L=460mm MA BD-J350B 1617-012-2977-90CABLE ASSY 12 WAYS AWG26 2.5P UL2468 L=230mm

30、 MA BD-J502B 1717-012-2994-90CABLE ASSY 14 WAYS #26 2.5P UL1007 L=540mmMA BD-J8101B 1817-012-2960-90 CABLE ASSY 3 WAYS AWG=18 3.96P UL1015 L=320mm SPK BD-J782B1, J782B2,J782B3 1917-012-2995-90 CABLE ASSY 3 WAYS AWG=18 3.96P UL1015 L=350mm SPK BD-J582B1, J582B2,J582B3 2017-012-2996-90 CABLE ASSY 5 WA

31、YS AWG=18 3.96P UL1007 L=250mm (V/BL/Y) SPK BD-J801B1, J801B3,J801B5 2117-012-2997-90 CABLE ASSY 5 WAYS AWG=18 3.96P UL1007 L=120mm (BR/R/O) SPK BD-J501B1, J501B3,J501B5 2217-012-2998-90 CABLE ASSY 3 WAYS AWG=18 3.96P UL1015 L=240mm SPK BD-J504B1, J504B3 2317-012-2972-90 CABEL ASSY 6 WAYS AWG=26 2.5

32、P UL1533X1C L=350mm PO BD-J612A 10 ItemItemDatabase Part NumberDatabase Part NumberDescriptionDescriptionRemarkRemark 2417-012-2999-90 CABLE ASSY 6 WAYS AWG=26 2.5P UL 1533X1C L=540mm PO BD-J611A 2517-012-2948-90 CABLE ASSY 1 WAY AWG=16 UL1672 BROWN L=100mm PS BD-J757 2617-012-2874-90CABLE ASSY 1 WA

33、Y AWG=16 UL1672 BLUE L=100mm PS BD-J756 2717-012-2965-90CABLE ASSY 4 WAYS AWG26 2.5P UL2468 L=400mmPS BD-J753A 2817-012-3000-90CABLE ASSY 2 WAYS AWG=18 UL1007 L=170MMSE BD-J803A 2917-012-3001-90CABLE ASSY 6 WAYS #18 3.96P UL1007 L=150MMSE BD-J801A 3017-012-2973-90 CABLE ASSY 8 WAYS AWG=26 2.5P UL100

34、7 L=380mm SV BD-J414A 3117-012-2956-90 CABLE ASSY 1 WAY AWG18 UL1007 BLACK L=100mm W/ RING TERMINAL V6 BD-P4402 3217-010-0032-90 FFC CABLE 30 PINS P1.25 L=70mm W/SHIELD J601C 3317-010-0033-90 FFC CABLE 17 PINS P1.25 L=200mm W/ SHIELD J720C 3417-010-0038-90FFC CABLE 20 PINS P1.25 L=160mm W/ SHIELD J6

35、04C 3517-010-0039-90FFC CABLE 28 PINS P1.25 L=170mm W/ SHIELDJ602C,J603C 3617-010-0040-90FFC CABLE 30 PINS P1.25 L=220mm W/ SHIELDJ713C,J714C 3717-012-2875-90 CABLE ASSY 1 WAY AWG=16 UL 1015 GREEN/YELLOW L=100mm 1-CHASSIS GND 3817-012-2948-90 CABLE ASSY 1 WAY AWG=16 UL1672 BROWN L=100mm 1-INLET/PSU.

36、BD (L),J759 3917-012-2874-90CABLE ASSY 1 WAY AWG=16 UL1672 BLUE L=100mm 1-INLET/ PSU.BD,J758 11 BLOCK DIAGRAM SELECTOR IN AUDIO IN/OUT TRIGGER HCF4094 MATRIX CD TUNER KEY IR IN VOLUME ENCODE V4 V6 V5 V1 V2 V3 IN Ex SUB V3 OUT V4 OUT IN IN IN Ex SURR Ex CEN Ex BSURR 24C16 EEPROMRST IC TCM810 MUTE MUT

37、E OUT MS AUDIO AMP POWER MUTE MUTE MUTE MUTE AMP POWER PRE-OUT SPK RELAY RELAY OUT SPK OUT SPK RELAY RELAY (A) OUT OUT SPK RELAY OUT SPK (B) M61516 VOLUME / SELECTOR ELECT AUDIO M61516 VFD PT6306 VFD DRIVER CPU T89C51RD2 DATACLK MSR MSL SR SL BSL BSR BSL C FR FL FR C FL BSR FR C BSL FL SR SL BSL FL

38、FR C FR FL SHIFT REGISTERS HCF4094 ARRAY OF T89C51RD2 CPU 74VHC 245 4051 CS49326 M61516 LC74763 CS8415A CS4228 CS4340 74HC (COMPOSITE/S) (COMPONENT) DIR IN OUT IN TAPE Ex FRONT TAPE OPT IN 74HC157 C CS4340 96/24 D/A 96/24 CS4228 D/A CPU 74HC251OUT COAX IN COAX / OPT CPU CS-8415 CS CPU CDOUT RESET CC

39、LK CDIN CPU CS-49326 74HC574256k x8 W27C02 EPROM CPU MUTE MUTE IN EXT 7.1 IN VIDEO IN VIDEO CPU (COMPONENT) VIDEO OUT MON OUT CPU V4 OUT V3 OUT DSP SECTION BSR VOLUME / SSRSLFRBSL ELECT AUDIO FL SHIFTER 74HC245 LEVEL RE-DIRECT BASS SHIFTERSHIFTER 74HC24574HC245 DSP RESET CS CDOUT CDIN CCLK CPU INTRE

40、G LEVELLEVEL A17 A16 A15 CPU SR SUB SL SR SL SUB 74HC0074HC04 V1 V2 74HC4052 MULTI- PLEXER 75 OHM DRIVER BA7660FS OSD LC74763 V3 V4 V6 V5 V1 V2 VIDEO SELECTOR 74HC4051 12 SPECIAL FUNCTION FEATUREKEYS PRESS ON FRONT PANEL RESET FOR AH VERSIONVIDEO 6 +SOURCE UP RESET FOR C VERSIONVIDEO 6 + SOURCE DOWN

41、 NTSC / PAL SELECTIONVIDEO + MEMORY VFD ALL DISPLAYAUDIO 6 + TONE DEFEAT AM FREQ. STEPAM/FM + FM MUTE DETAILS & WAVEFORMS ON SYSTEM TEST & DEBUGGING M6759(U202) main clock is at 20MHz(X202) M6759(U201) main clock is at 20MHz(X201) UPPER - +5V supply to KEYBOARD when power up LOWER - RESET line (TCM8

42、10LENB713) when power up UPPER - OUTPUT ENABLE(pin 24) of EPROM (W27C02) when changing SURROUND MODES LOWER - CHIP ENABLE(pin 22) of EPROM (W27C02) when changing SURROUND MODES SCLK (pin 43 of CS49326) LRCLK (pin 42 of CS49326) MCLK (pin 30 of CS49326) NOTE: The waveforms are based on software versi

43、on V2.10. 13 AMPLIFIER ADJUSTMENT Idle Current 1.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 1mV reading on voltmeter. 5.Leave power on for at least 5 min, and check for idle current again. 6.Repeat for other channels. CHANNELJUMPERVR FLP501R