Nad-T-744-Service-Manual(1) 电路图 维修手册.pdf

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1、NAD SERVICE MANUALT 744 T 744 A/V Receiver A/V Receiver DRAFT DATE: 08 MAY 2007RadioFans.CN 收音机爱 好者资料库 2 SAFETY INFORMATION 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 REPLACE ONLY WITH SAME TYPE OF FUSE. Refe

2、rence DesignatorDatabase Part NumberDescription F751*AH20-001-0075-90FUSE TIME-LAG 7A 250V 5 X 20mm SIC UL/CSA (RoHS) F752*AH20-001-0076-90FUSE 1.6A 250V TIME LAG LBC 5x20mm TSD UL/CSA/VDE/SEMKO (RoHs) F751*C,CT20-001-0071-90FUSE TIME-LAG 4A/250V 5 X 20mm VDE/UL TSD (RoHS) F752*C,CT20-001-0069-90 FU

3、SE 800mA 250V TIME LAG LBC 5x20mm TSD UL/CSA/VDE/SEMKO (RoHS) FH751-FH75220-002-0030-90FUSE CLIP 0.05mm WL-210A 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 measuremen

4、ts to determine that exposed parts are acceptably insulated from supply circuit. CONTENTS DESCRIPTIONPAGE SPECIFICATIONS. 4 - 5 REAR PANEL / FRONT PANEL VIEW . 6 DISASSEMBLY INSTRUCTIONS . 7 WIRING DIAGRAM & PARTS LIST. 8 - 10 BLOCK DIAGRAM.11 SPECIAL FUNCTION . 12 DETAILS & WAVEFORMS ON SYSTEM & TE

5、ST & DEBUGGING . 12 ADJUSTMENT POINTS DIAGRAM / AMPLIFIER ADJUSTMENT . 13 PCB LAYOUT . 14 - 25 SCHEMATIC DIAGRAM . 26 - 42 IC BLOCK DIAGRAM . 43 - 49 EXPLODED VIEW. 50 EXPLODED VIEW PARTS LIST. 51 - 53 ELECTRICAL PARTS LIST . 54- 66 PACKING DIAGRAM . 67 Parts marked with the symbol are critical with

6、 regard to the risk of fire and electric 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 S

7、L/SR/BS) 0.1 % Input Sensitivity(ref. 8 ohms, 1 kHz)260 20mV 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

8、, 100 Hz) 0.5 % Crosstalk(500 mV input, 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 S

9、R Track 47 200 - 20 kHz 0.8 dB C Track 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(TRACK 30 for O/P 1 W, FAUSE)CCIR / ARM 65 dB Au

10、dio LPF 70 dB A-WTD 70 dB Channel Separation(1 W, A-WTD FILTER)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 kHz0 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

11、/SR40 Hz0 2.0 dB 20 kHz0 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 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/SRTrack

12、 61 kHz2.5 0.2 W Channel Difference (FL ref): FL/FR/C/SL/SRTrack 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 2 dB AM TUNE

13、R SECTION Input level is expressed as 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 mV Loop sensitivit

14、y(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,*CT *AH,*AHT 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(6

15、0 dB, IHF wtd)Mono 63 dB 63 dB Stereo 63 dB 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

16、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) 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 S

17、ensitivity 26 dB PHYSICAL SPECIFICATIONS Dimensions (Width x Height x Depth)435 x 150 x 390 mm Net Weight13.3 Kg (29.30 lbs) Shipping Weight16.9 Kg (37.20 lbs) 6 FRONT PANEL REAR PANEL / FRONT PANEL VIEW REAR PANEL 1.FM & AM ANTENNA 2.MONITOR OUT 3.CD INPUT 4.DIGITAL AUDIO INPUT & DIGITAL AUDIO OUTP

18、UT 5.SOFT CLIPPING ON/OFF 6.IR INPUT & OUTPUT 7.+12V TRIGGER INPUT & OUTPUT 8.COMPONENT VIDEO IN & COMPONENT VIDEO OUT 9.AC POWER CORD 10.POWER SWITCH 11.SWITCHED AC OUTLETS 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.DI

19、SC INPUT 17.5.1 CH. INPUTS 1.STANDBY SWITCH 2.STANDBY LED 3.AM / FM 4.DISPLAY 5.MEMORY 6.FM MUTE / MODE 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

20、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 11 and tilt approx. 35 and then remove in the direction as indicated by

21、 the arrow 12. Refer to Figure No. 2. Figure No. 1 Figure No. 2 8 WIRING DIAGRAM TUNER J705A J705B FROM TRANSFORMER 32 28 30 29 6 8 3133 2627 2525 24 9 10 12 23 21 2019 18 1716 15 14 13 7 4 5 3 21 11 22 FOR T2743 120V VER.FOR T2743 120V VER. J203A J713BJ714B J753BJ204B J713AJ714A J782B J715A J720A J

22、709A J502B J704A J707A J710A J717A J719A J711A J715B J604B J203B DSP BOARD J1010B J1009B J3103BJ709B VIDEO 6 INPUT LED BOARD J783A J782A J784A J781A J786A J710B J711B J704B J414B J1010AJ1009A J602B J603B J707B J414A J612A J611A J717B J601B J719B J601A J602A J603A J604A J751B J753A J754B J753_NJ753_L

23、 J759_L J758_N J504A J612A J502A J503A J501A J505A J506A J504B J781B J501B J506A J503B J611B J801A J204A J505B J506B J801B J350A J786B J201 J701 P4401P4402 J606B J350B J3103B J606B 9 WIRING DIAGRAM PARTS LIST ItemDatabase Part NumberDescriptionRemark 117-012-2959-90CABLE ASSY 3 WAYS AWG=18 3.96P UL1

24、007AMP1 L=180mmBD-J504A 217-012-2969-90CABLE ASSY 5 WAYS P3.96 AWG18 UL1007AMP1 L=200mmBD-J501A 317-012-2976-90CABLE ASSY 12 WAYS AWG=26 2.5P UL2877AMP1 L=120mmBD-J503A 417-012-2959-90CABLE ASSY 3 WAYS AWG=18 3.96P UL1007AMP2 L=180mmBD-J781B 517-012-2966-90CABLE ASSY 4 WAYS AWG26 2.5P UL1533AUDIO L=

25、450MM (ROHS)BD-J3103A 617-012-2957-90CABLE ASSY 2 WAYS AWG=26 2.5P UL1533DIGIT BD- L=540mm (ROHS)J1009A 717-012-2961-90CABLE ASSY 3 WAYS AWG=26 X2C P=2.5DIGITAL BD- UL2854 L=110mm C33110 (RoHS)J705A 817-012-2967-90CABLE ASSY 4 WAYS AWG=26 2.5PDIGITAL BD- UL2877 L=500mm (RoHS)J1010A 917-012-2956-90CA

26、BLE ASSY 1 WAY AWG18 UL1007 BLACKKEYBOARD- L=100mm W/ RING TERMINAL (RoHS)J201 1017-012-3404-90CABLE ASSY 5 WAYS AWG26 2.5P UL1007LED BD- L=160mm (RoHS)J204A 1117-012-2963-90CABLE ASSY 3 WAYS AWG=26 2.5P L=110mmMAIN BD- J606B 1217-012-2964-90CABLE ASSY 3 WAYS AWG26X2C UL2547MAIN BD- L=210mm (UL LABE

27、L) (RoHS)J715A 1317-012-2974-90CABLE ASSY 8 WAYS AWG=26X3C L=480mmMAIN BD- (RoHS)J709A 1417-012-2977-90CABLE ASSY 12 WAYS AWG26 2.5P UL2468MAIN BD- L=230mm (UL LABEL) (RoHS)J502A 1517-012-2978-90CABLE ASSY 14 WAYS AWG=26 2.5P UL1007MAIN BD- L=440mm (UL LABEL) (RoHS)J782B 1617-012-2962-90CABLE ASSY 3

28、 WAYS AWG=26 2.5P UL2854PO BD- L=420mm (RoHS)J611A 1717-012-2972-90CABEL ASSY 6 WAYS AWG=26 2.5PPO BD- UL1533X1C L=350mm (RoHS)J612A 1817-012-2965-90CABLE ASSY 4 WAYS AWG26 2.5P UL2468PS BD- L=400mm (ROHS)J753A 1917-012-2958-90CABLE ASSY 3 WAYS AWG=18 3.96P UL1007SPK L=120mmBD-J801B 2017-012-2960-90

29、CABLE ASSY 3 WAYS AWG=18 3.96P UL1015SPK BD- L=320mmJ505B 2117-012-2968-90CABLE ASSY 5 WAYS AWG=18 3.96P UL1007SPK BD- L=350mmJ786B 2217-012-2970-90CABLE ASSY 5 WAYS AWG18 UL1007SPK BD- L=300mm (V/B/Y) (UL LABEL) (RoHS)J506B 2317-012-2973-90CABLE ASSY 8 WAYS AWG=26 2.5P UL1007SV BD- L=380mm (RoHS)J4

30、14A 2417-012-2975-90CABLE ASSY 8 WAYS AWG=26 2.5P UL1007TR BD- L=540mm (UL LABEL) (RoHS)J350A 2517-012-2956-90CABLE ASSY 1 WAY AWG18 UL1007 BLACKV6 BD- L=100mm W/ RING TERMINAL (RoHS)P4401,P4402 2617-012-2948-90CABLE ASSY 1 WAY AWG=16 UL1672J759 BROWN L=100mm 2717-012-2874-90CABLE ASSY 1 WAY AWG=16

31、UL1672J758 BLUE L=100mm 2817-010-0032-90FFC CABLE 30 PINS P1.25 L=70mmJ601A W/SHIELD 10 ItemDatabase Part NumberDescriptionRemark 2917-010-0033-90FFC CABLE 17 PINS P1.25 L=200mmJ720C W/ SHIELD 3017-010-0069-90FFC CABLE 20 PINS P1.25 L=120mmJ604C W/ SHIELD 3117-010-0035-90FFC CABLE 20 PINS P1.25 L=20

32、0mmJ713C W/ SHIELD 3217-010-0036-90FFC CABLE 28 PIN P1.25 L=160mmJ602C,J603C W/ SHIELD 3317-010-0037-90FFC CABLE 28 PINS P1.25 L=200mmJ714C W/SHIELD 11 BLOCK DIAGRAM 12 SPECIAL FUNCTION FEATUREKEYS PRESS ON FRONT PANEL RESET FOR AH VERSIONVIDEO 6 + SOURCE UP RESET FOR C VERSIONVIDEO 6 + SOURCE DOWN

33、NTSC / PAL SELECTIONVIDEO 6 + MEMORY VFD ALL DISPLAYVIDEO 6 + TONE DEFEAT AM FREQ. STEPAM/FM + FM MUTE VERSION CHECKVIDEO 6 + TONE CONTROL DETAILS & WAVEFORMS ON SYSTEM TEST & DEBUGGING T89C51RB2 (U202) main clock is at 20MHz (X202) T89C51RD2 (U201) main clock is at 20MHz (X201) UPPER - +5V supply t

34、o KEYBOARD when power up LOWER - RESET line (TCM810LENB713) 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 CS493

35、26) NOTE: The waveforms are based on software version V2.12. 13 R522R545R571 P501 P801 P802 R835R836 P502P503 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

36、reading on voltmeter. 5.Leave power on for at least 5 min, and check for idle current again. 6.Repeat for other channels. CHANNELJUMPERVR FLP501R522 FRP502R545 CP503R571 SLP801R835 SRP802R836 ADJUSTMENT POINT DIAGRAM FRONT/CENTER AMPLIFIER BOARD SURROUND AMPLIFIER BOARD 14 PCB LAYOUT AUDIO BOARD POW

37、ER SUPPLY (STANDBY) / POWER SWITCH 15 COMPOSITE VIDEO BOARD - COMPONENT SIDE COMPOSITE VIDEO BOARD - COPPER SIDE 16 COMPONENT VIDEO BOARD - COMPONENT SIDE COMPONENT VIDEO BOARD - COPPER SIDE DIGITAL BOARD - COMPONENT SIDE DIGITAL BOARD - COPPER SIDE 17 DSP BOARD - COPPER SIDE DSP BOARD - COMPONENT S

38、IDE 18 FRONT / CENTER AMPLIFIER BOARD 19 SURROUND AMPLIFIER BOARD 20 KEYBOARD - COMPONENT SIDE- COPPER SIDE 21 MAIN BOARD 22 MULTI-CHANNEL BOARD - COMPONENT SIDE- COPPER SIDE 23 PRE-OUT BOARD - COMPONENT SIDE - COPPER SIDE 24 SPEAKER TERMINAL BOARD TRIGGER BOARD VIDEO 6 BOARD POWER SUPPLY (SECONDARY

39、) LED BOARD 25 S-VIDEO BOARD - COMPONENT SIDE S-VIDEO BOARD - COPPER SIDE 26 SCHEMATIC DIAGRAM AUDIO SWITCH RESISTORS : UNLESS OTHERWISE SPECIFIED ARE CARBON FILM. NOTE: 1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%. 2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%. 27 CO

40、MPONENT VIDEO RESISTORS : UNLESS OTHERWISE SPECIFIED ARE CARBON FILM. NOTE: 1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%. 2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%. 28 E C B 2SA2878 E C B 2SA933 DTC123ESA E C B COMPOSITE VIDEO RESISTORS : UNLESS OTHERWISE SPECIFIE

41、D ARE CARBON FILM. NOTE: 1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%. 2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%. 29 POWER SUPPLY (SECONDARY) NOTE:1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%. 2. COMPONENTS MARKED ARE SAFETY CRITIAL PARTS. 30 POWER SUPPL

42、Y (STAND BY) E C B 2SC1815 RESISTORS : F-FUSIBLE, UNLESS OTHERWISE SPECIFIED ARE CARBON FILM. NOTE:1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%. 2. COMPONENTS MARKED ARE SAFETY CRITIAL PARTS. 31 DTC123ESA E C B TRIGGER RESISTORS : UNLESS OTHERWISE SPECIFIED ARE CARBON FILM. NOTE:1. RESISTO

43、RS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%. 2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%. 32 VIDEO 6 RESISTORS : UNLESS OTHERWISE SPECIFIED ARE CARBON FILM. NOTE: 1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%. 2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%. 33 E C B 2SA933 E C B 2SC1740 E C B 2SC1815 2SC2878 DTC144ESA DTC123ES