NAD-T754-avr-sm 维修电路原理图.pdf
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1、NADSERVICE MANUALT 754T 754Surround Sound ReceiverSurround Sound ReceiverDRAFT DATE: 08 MAY 2007RadioFans.CN 收音机爱 好者资料库2SAFETY INFORMATIONAH VERSIONC VERSIONRadioFans.CN 收音机爱 好者资料库3SERVICE SAFETY PRECAUTIONS1. Replacing the fusesCAUTION:FOR CONTINUED PROTECTION AGAINST THE RISK OF FIRE REPLACE ONLY
2、WITH SAME TYPE OFFUSE.Reference DesignatorDatabase Part NumberDescriptionF751*AH20-001-0078-90 FUSE TIME-LAG 10A/250VAC 5X20mmUL/CSA 5TF751*C,CT20-001-0069-90 FUSE 800mA 250V TIME LAG LBC5x20mm 5T UL/CSA/VDE/SEMKOF752*AH20-001-0076-90 FUSE 1.6A 250V TIME LAG LBC5x20mm 5T UL/CSA/VDE/SEMKOF752*C,CT20-
3、001-0072-90 FUSE TIME-LAG 6.3A/250VAC5X20mm VDE/UL/CSA 5TNOTE: : 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 determinethat exposed parts are acceptably insulated
4、from supply circuit.CONTENTSDESCRIPTIONPAGESPECIFICATIONS. 4 - 5REAR PANEL / FRONT PANEL VIEW . 6DISASSEMBLY INSTRUCTIONS . 7WIRING DIAGRAM. 8 - 10BLOCK DIAGRAM.11SPECIAL FUNCTION . 12DETAILS & WAVEFORMS ON SYSTEM & TEST & DEBUGGING . 12ADJUSTMENT POINTS DIAGRAM / AMPLIFIER ADJUSTMENT . 13PCB LAYOUT
5、 . 14 - 29SCHEMATIC DIAGRAM . 30 - 46IC BLOCK DIAGRAM . 47 - 54EXPLODED VIEW. 55EXPLODED VIEW PARTS LIST. 56 - 58ELECTRICAL PARTS LIST . 59 - 73PACKING DIAGRAM . 74Parts marked with the symbol are critical with regard to the risk of fire and electricshock. Replace only with parts recommended by the
6、manufacturer.4SPECIFICATIONSPOWER AMPLIFIER SECTIONRated 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 ohms, 1 kHz)296 20 mVS/N Ratio(A-wtd, 1kHz, 1 W, 8 ohm, SL/SR/BL) - 75 dBFreque
7、ncy Response(20 Hz - 20 kHz)0 1.0 dBChannel Balance(1 dB to -40 dB, 1 kHz) 2 dB(-41 dB to -50 dB, 1 kHz) 3 dBAudio muting at 1 kHz 55 dBSubwoofer out, 500 mV in(THD at 2 V O/P, 100 Hz) 0.5 %Crosstalk(500 mV input, 10 W, 1 kHz) -57 dBControlsBass(at 500 mV in, 1 W out, 100 Hz) 10 dB 2 dBTreble(at 500
8、 mV in, 1 W out, 10 kHz) 10 dB 2 dBDOLBY DIGITAL SECTIONChannel Difference(FL ref. Track 30) 1.2 dBFrequency Resporse at Dolby config.2SL Track 46 200 - 20 kHz 0.8 dBSR Track 47 200 - 20 kHz 0.8 dBC Track 44 200 - 20 kHz 0.8 dBHarmonic Distortion (1 W, Audio LPF, Dolby Congfig 1)FL Track 65 997 Hz 0
9、.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 dBAudio LPF 70 dBA-wtd 70 dBChannel Separation (1 W, 20 kHz LPF)Track 65 997 Hz 60 dBDOLBY PRO LOGIC II SECTIONFrequency ResporseI/P mode : L, R:
10、1 V in, 1 W, Ch L/R40 Hz0 2.0 dB20 Hz0 2.0 dBI/P mode : L=R: 1 V in, 1 W, Ch /L/R40 Hz0 2.0 dB Ch C20 kHz0 2.0 dBI/P mode : L=-R: 1 V in, 1 W, Ch SL/SR40 Hz0 2.0 dB20 kHz0 2.0 dBS/N Ratio (200 mV in, 1 W, A-WTD w/ 1 k termination)I/P mode : L, R: 1 kHz, Ch L/R 65 dBI/P mode : L=R: 1 kHz, Ch C 65 dBI
11、/P mode : L=-R: 1 kHz, Ch SL/SR 65 dBTHD (2.2 V in, 1 W, w/ 80 kHz LPF, 1 kHz) 0.2 %5DTS SECTIONOutput Level (Vol 0 dB): FL/FR/C/SL/SR Track 61 kHz0.3 1.3 WChannel Difference (FL ref): FL/FR/C/SL/SR Track 61 kHz 1.0 dBHarmonic Distortion (Audio Filter) : FL/FR/C/SL/SRTrack 10-14 1 kHz 0.08 %Frequenc
12、y Response (20 Hz to 20 kHz)Track 26-30+2/-1.5Subwoofer Output Level1 kHz ref at pre-out (FL)Play Track 10, charge to 1512.5 1.5 dBAM TUNER SECTIONInput level is expressed as the reading in open circuitof 75-ohm source impedance signal generatorUsable sensitivity(999/1000 kHz) 30 dB VS/N Ratio(5 mV
13、in) 38 dBTHD(5 mV in) 3 %IF Rejection(450 kHz) 36 dBImage Rejection(F+2xIF) 28 dBSelectivity 17 dBOutput170 -20/+30 mVLoop sensitivity(20 dB S/N)999/1000 kHz 66 dB603/600 kHz 66 dB1404/1400 kHz 66 dBFrequency Response(100 - 2.3 kHz, 5 mV) 6 dBFM TUNER SECTION*C*AHInput level is expressed as the read
14、ing in open circuitof 75-ohm source impedance signal generatorUsable sensitivity(98 MHz) 15 dB 15 dB vS/N Ratio(60 dB, IHF wtd)Mono 63 dB 63 dBStereo 63 dB 63 dBFrequency Response(20 Hz - 15 kHz, 60 dB )0 1.5 dB0 1.5 dBChannel Separation(60 dB )100 Hz 30 dB 30 dB1 k 38 dB 38 dB10 kHz 30 dB 30 dBAlte
15、rnate Channel Selectivity (40 dB , 400 kHz) 60 dB 45 dBCapture Ratio(40 dB ) 3 dB 3 dBAM Suppression (60 dB , 100% Mod. FM, 30% Mod. AM) 48 dB 48 dBImage Rejection(119.4 MHz) 65 dBI.F. Rejection(10.7 MHz) 78 dB Pilot Suppression(98 MHz) 60 dB 60 dBTHD (60 dB, L=R 75 kHz for AH, 40 kHz Dev for C) Mon
16、o 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 SPECIFICATIONSDimensions (Width x Height x Depth)435 x 170 x 423 mmNet Weight20.50 Kg (45.10 lbs)Shipping Weight24.0 Kg (52.80 lbs)6FRONT PANELREAR PANEL / FRONT PANEL VIEWR
17、EAR PANEL1.FM & AM ANTENNA2.SOFT CLIPPING ON/OFF3.MONITOR OUT4.CD INPUT5.IR INPUT & OUTPUT6.+12V TRIGGER INPUT & OUTPUT7.COMPONENT VIDEO IN &COMPONENT VIDEO OUT8.DIGITAL AUDIO INPUT &DIGITAL AUDIO OUTPUT9.POWER SWITCH10.SWITCHED AC OUTLETS11.AC POWER INLET12.SPEAKERS A & B13.DVD, SAT, VCR, VIDEO 4 &
18、 VIDEO 514.MAIN IN / AUDIO PRE-OUTS /SUBWOOFER OUT15.TAPE INPUT & OUTPUT16.MS OUT (MULTISOURCE OUT)17.7.1 CH. INPUTS1.STANDBY SWITCH2.STANDBY LED3.AM / FM4.FM MUTE / MODE5.DISPLAY6.MEMORY7.PRESET DOWN / UP8.SEARCH DOWN / UP9.VFL DISPLAY10.VOLUME (SETUP)11.SOURCE DOWN / UP12.SURROUND MODE13.LEVELS14.
19、TONE DEFEAT15.TONE CONTROLS16.SPEAKERS A & B17.VIDEO 6 INPUT18.PHONES7DISASSEMBLY INSTRUCTIONS1.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 an
20、d tilt approx. 35 and thenremove in the direction as indicated by the arrow 12. Refer to Figure No. 2.Figure No. 1Figure No. 28WIRING DIAGRAMKEYBOARDMAIN BOARDTRIGGER BOARDPOWER SWITCHBOARDJ8101BJ713AJ714AJ715AJ719AJ720AJ717AJ710AJ711AJ712AJ707AJ704AJ502BJ709AJ713BJ714BJ203AJ204BJ901BJ753BVIDEO 6 IN
21、PUT BOARDJ758BJ757BJ709BDSP BOARDJ604BJ715BJ1009BJ1010BLED BOARDPSU BOARDCOMPONENT VIDEO DIGITAL BOARD AUDIO BOARDVIDEO BOARDSPEAKER A SPEAKER B J1009AJ1010ARS232 BOARDTUNERPRE-OUT BOARDMULTI-CHANNEL J717BJ611AJ612AJ6101BJ6101AJ719BJ6104AJ708BJ707BJ350AJ414BJ710BJ711BJ712BJ414ASECONDARY BOARDISC BOA
22、RDJ801AJ781AJ782AJ582AJ801BJ783A1J511BJ704BJ3103AS-VIDEO BOARDAMP 2 BOARD(SURROUND AMP.)AMP 1 BOARD(FRONT & CENTER)J612BJ502AJ503AM506J511AJ581AJ781BJ503BJ611BJ801AJ901AJ753AJ754BJ751BJ504AJ501AJ757J756J761_NJ761_LJ760J758J759J203BJ803AJ3103BJ6102BJ6103BJ6102AJ6103AJ201J204AJ6106AJ6105AJ350BJ6106AJ6
23、105AJ8101AJ784AJ803BJ504B1J504B3J582A1J582A3J582A5J501B1J501B3J501B5J582A1J582A3J582A5J701J782A1J782A2J782A3P4402J581BTHERM SENSNORTHERM SENSNORTO MAIN BOARDTO MAIN BOARDTO MAIN BOARDTO MAIN BOARDTO MAIN BOARD82-0426135-01-XXCABLE ASSY 4 WAYS #26 FROM TRANSFORMERUL VERSION : USE J758, J759CE VERSION
24、 : USE J760MOUNT ONCHASSIS GND3334353632373839311530292827262524231920171614131211108921765432118229WIRING DIAGRAM PARTS LISTItemItemDatabase Part NumberDatabase Part NumberDescriptionDescriptionRemarkRemark117-012-2986-90CABLE ASSY 2 WAYS AWG=26 2.5P UL2468L=440mmAMP1 BD-J511A217-012-2987-90CABLE A
25、SSY 4 WAYS AWG=18 3.96P UL1007L=420mmAMP1 BD-J581A317-012-2988-90CABLE ASSY 6 WAYS AWG=26 2.5P UL1007L=320mmAMP1 BD-J503A417-012-2989-90CABLE ASSY 4 WAYS AWG=18 3.96P UL1007L=200mm REV.BAMP2 BD-J781B517-012-2966-90CABLE ASSY 4 WAYS AWG26 2.5P UL1533 L=450MMAUDIO BD-J3103A617-012-2957-90CABLE ASSY 2
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