NAD-T773-avr-sm 维修电路原理图.pdf

NADSERVICE MANUALT 773T 773A/V ReceiverA/V ReceiverAUG 2005RadioFans.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 WITH SAME TYPE OFFUSE.Reference DesignatorPart NumberDescriptionF751*AH 33-0321111-00-88FUSE 20A/250VAC SLOW BLOW 6X32mm6S UL/CSAF751*C 33-0161006-00-88FUSE 10A/250VAC TIME-LAG 5X20mm5D VDE/UL/CSAF752*AH 33-0111006-00-88FUSE 1.6A 250V TIME LAG 5x20mm 5TUL/CSA/VDE/SEMKOF752*C 33-0151006-00-88FUSE 800mA 250V TIME LAG 5x20mm5T UL/CSA/VDE/SEMKONOTE: : 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 from supply circuit.CONTENTSDESCRIPTIONPAGESPECIFICATIONS. 4 - 5REAR PANEL / FRONT PANEL VIEW . 6DISASSEMBLY INSTRUCTIONS . 7WIRING DIAGRAM. 8BLOCK DIAGRAM. 9SPECIAL FUNCTION . 10DETAILS & WAVEFORMS ON SYSTEM & TEST & DEBUGGING . 10ADJUSTMENT POINTS DIAGRAM / AMPLIFIER ADJUSTMENT .11PCB LAYOUT . 12 - 25SCHEMATIC DIAGRAM . 26 - 45IC BLOCK DIAGRAM . 46 - 54EXPLODED VIEW. 55 - 57EXPLODED VIEW PARTS LIST. 58 - 59ELECTRICAL PARTS LIST . 60 - 73PACKING DIAGRAM . 74VERSION HISTORY . 75Parts marked with the symbol are critical with regard to the risk of fire and electric shock.Replace only with parts recommended by the 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)166 20 mVS/N Ratio(A-wtd, 1kHz, 1 W, 8 ohm, SL/SR/BL) - 72 dBFrequency 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 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 0.08 %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 dBAudio LPF 70 dBA-WTD 70 dBChannel Separation(1 W, A-WTD FILTER)Track 65 997 Hz 60 dBDOLBY PRO LOGIC II SECTIONFrequency ResporseI/P mode : L, R: 1 V in, 1 W, Ch L/R40 Hz0 2.0 dB20 kHz0 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/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/SRTrack 61 kHz0.3 1.3 WChannel Difference (FL ref): FL/FR/C/SL/SRTrack 61 kHz 1.0 dBHarmonic 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 dBSubwoofer 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 dBuVS/N Ratio(5 mV 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 reading in open circuitof 75-ohm source impedance signal generatorUsable sensitivity(98 MHz) 15 dBV 15 dBuvS/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 dBAlternate 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)Mono 0.25 % 0.25 %Stereo 0.35 % 0.35 %Auto-Search SensitivityOn 24 dB 24 dBOff 15 dB 15 dBRDS decode Sensitivity 26 dB PHYSICAL SPECIFICATIONSDimensions (Width x Height x Depth)435 x 195 x 423 mmNet Weight24 Kg (52.80 lbs)Shipping Weight30.7 Kg (67.50 lbs)6FRONT PANELREAR PANEL / FRONT PANEL VIEWREAR PANEL1.FM & AM ANTENNA2.IR INPUT & OUTPUT3.+12V TRIGGER INPUT & OUTPUT4.SOFT CLIPPING ON/OFF5.MS OUT (MULTISOURCE OUT)6.MONITOR OUT7.CD INPUT8.COMPONENT VIDEO IN &COMPONENT VIDEO OUT9.DIGITAL AUDIO INPUT &DIGITAL AUDIO OUTPUT10.RS-23211.POWER SWITCH12.SWITCHED AC OUTLETS13.AC POWER INLET14.SPEAKERS A & B15.DVD, SAT, VCR, VIDEO 4 & VIDEO 516.MAIN IN / AUDIO PRE-OUTS /SUBWOOFER OUT17.TAPE INPUT & OUTPUT18.DISC INPUT19.7.1 CH. INPUTS1.STANDBY SWITCH2.STANDBY LED3.AM / FM6.FM MUTE / MODE4.DISPLAY5.MEMORY7.PRESET DOWN / UP8.SEARCH DOWN / UP9.VFL DISPLAY10.VOLUME (SETUP)11.VIDEO & AUDIO12.TAPE MONITOR13.DIGITAL AUDIO SELECTOR14.EXT. 7.115.SURROUND MODE16.LEVELS17.TONE CONTROLS18.TONE DEFEAT19.SPEAKERS A & B20.VIDEO 6 INPUT21.PHONES7DISASSEMBLY INSTRUCTIONS1.Remove machine screws M4.0 x 8.0 (1 to 8) from the side panels.Remove tapping screw 3.0 x 8.0 (9 to 12) from the back panel.Refer to Figure No. 1.1234891011125672.Pull both sides of the TOP COVER slightly outwards 13 and tilt approx. 35 and then removein the direction as indicated by the arrow 14. Refer to Figure No. 2.Figure No. 1141313Figure No. 28aWIRING DIAGRAM8bTHERM SENSNORUL VERSION : USE J758, J759CE VERSION : USE J7603 PCS2 PCS36-2828201-71-XXFFC CABLE 28 PINS P1.25 L=200mm82-0226135-04-XXCABLE ASSY 2 WAYS 2.5P UL1533 L=540mm82-0426135-03-XXCABLE ASSY 4 WAYS 2.5P UL2468 L=540mm36-1728201-71-XXFFC CABLE 17 PINS P1.25 L=200mm36-2028201-71-XXFFC CABLE 20 PINS P1.25 L=200mmTO MAIN BOARDTO MAIN BOARD82-3028061-71-XXFFC CABLE 30 PINS P1.25 L=60mm82-1026135-01-XXCABLE ASSY 10 WAYS #26 2.5P UL2877 L=540mmTO MAIN BOARD82-0826135-04-XXCABLE ASSY 8 WAYS #26 2.5P UL2468 L=380mmTO MAIN BOARDTO MAIN BOARD82-0426135-01-XXCABLE ASSY 4 WAYS #26 2.5P UL2877 L=500mm82-0626135-07-XXCABLE ASSY 6 WAYS #26 2.5P L=480mm82-0426135-07-XXCABLE ASSY 4 WAYS #26 2.5P L=450mm82-0326135-08-XXCABLE ASSY 3 WAYS #26 UL2854 L=300mm82-1226135-06-XXCABLE ASSY 12 WAYS #26 2.5P L=290mm82-0426135-05-XXCABLE ASSY 4 WAYS #26 2.5P UL2468 L=400mmFROM TRANSFORMER82-0826135-05-XXCABLE ASSY 8 WAYS #26 2.5P UL1533 L=340mm82-0626135-04-XXCABLE ASSY 6 WAYS #26 2.5P UL1533 L=540mm82-0618235-02-XXCABLE ASSY 6 WAYS #18 UL1007 L=170mm82-1426135-00-XXCABLE ASSY 14 WAYS #26 2.5P UL2877 L=420mm82-0518235-07-XX, CABLE ASSY 5 WAYS #18 3.96P UL1007 L=320mm (BK/W/BL)82-0626135-06-XXCABLE ASSY 6 WAYS #26 2.5P UL2468 L=320mm82-0418235-00-XXCABLE ASSY 4 WAYS #18 3.96P UL1007 L=200mm82-0418235-04-XXCABLE ASSY 4 WAYS #18 3.96P UL1007 L=320mmT773 WIRE DIAGRAM DATE : 17/05/04 REV. B82-0426135-00-XXCABLE ASSY 4 WAYS #26 2.5P UL2877 L=200mm82-0116438-03-XXCABLE ASSY 1 WAYS #16 UL1672 BLUE L=100mm82-0116436-12-XXCABLE ASSY 1 WAYS #16 UL1672 BROWN L=100mm82-0226135-02-XXCABLE ASSY 2 WAYS #26 2.5P UL2468 L=340mm82-0226135-03-XXCABLE ASSY 2 WAYS #26 2.5P UL2468 L=440mm82-0218235-01-XX, CABLE ASSY 2 WAYS #18 UL1007 L=170mm82-0618235-01-XX, CABLE ASSY 6 WAYS #18 UL1007 L=140mm82-0318235-06-XXCABLE ASSY 3 WAYS #18 3.96P UL1015 L=350mm82-0116436-08-XXCABLE ASSY 1 WAY #16 UL1015 GREEN/YELLOW L=100mmCHASSIS GND82-0526135-01-XXCABLE ASSY 5 WAYS #262.5P UL2468 L=150MM36-2828161-71-XXFFC CABLE 28 PINS P1.25 L=160mm82-0418235-05-XXCABLE ASSY 4 WAYS #18 3.96P UL1007 L=420mm82-0418235-01-XXCABLE ASSY 4 WAYS #18 3.96P UL1007 L=280mm82-0318235-03-XXCABLE ASSY 3 WAYS #18 3.96P UL1007 L=180mm82-0116436-12-XXCABLE ASSY 1 WAYS #16 UL1672 BROWN L=100mm82-0116438-03-XXCABLE ASSY 1 WAYS #16 UL1672 BLUE L=100mm82-0518235-06-XX, CABLE ASSY 5 WAYS #18 3.96P UL1007 L=120mm (R/BK/BR/O)82-0518235-04-XX, CABLE ASSY 5 WAYS #18 3.96P UL1007 L=250mm (V/BL/Y)82-0418235-00-XX, CABLE ASSY 4 WAYS #18 3.96P UL1007 L=200mm82-0118435-00-XXCABLE ASSY 1 WAY #18 UL1007 BLACK L=100mm W/ RING TERMINAL82-0118435-01-XXCABLE ASSY 1 WAY #18 UL1007 BLACK L=360mm W/ RING TERMINAL82-0118435-00-XXCABLE ASSY 1 WAY #18 UL1007 BLACK L=100mm W/ RING TERMINALKEYBOARDMAIN BOARDTRIGGER BOARDPOWER SWITCHBOARDJ702BJ8101BJ713AJ714AJ715AJ719AJ720AJ717AJ710AJ711AJ712AJ708AJ707AJ704AJ502BJ721AJ709AJ713BJ714BJ203AJ204BJ350BJ901BJ753BVIDEO 6 INPUT BOARDJ757BJ756BPSU BOARDCOMPONENT VIDEO BOARDDIGITALBOARD AUDIO BOARDVIDEO BOARDJ1009AJ1010ATUNERPRE-OUT BOARDMULTI-CHANNEL BOARDJ717BJ611AJ612AJ719BJ6104AJ708ABJ707BJ350AJ414BJ710BJ711BJ712BJ414ASECONDARY BOARDISC-S BOARDJ8202BJ8102BJ581AJ781AJ782AJ582AJ8101AJ8103AJ811BJ705BS-VIDEO BOARDAMP S BOARDAMP FR BOARDJ612BJ502AJ503AM506J873J511AJ781BJ503BJ611BJ801AJ811AJ753AJ754BJ751BJ504AJ501AJ702AJ874J757J756J761_NJ761_LJ760J758J759J8205BJ8105BJ901ASPEAKERBOARDJ8204AJ8202AJ8205AISC-FBOARDJ8102AJ8105AJ8104AJ511BJ6101BJ6102AJ6103AJ6101AJ6103BJ6102BJ509AJ875J505BJ505AJ581BJ3103BJ721BJ709BLED BOARDDSP BOARDJ715BJ604BJ203BJ1010BJ1009BJ205J206J509BJ3103AJ872J871J201J701J6106BJ6105BJ6106AJ6105AWIRING DIAGRAM9BLOCK DIAGRAM10SPECIAL FUNCTIONFEATUREKEYS PRESS ON FRONT PANELRESET FOR AH VERSIONVIDEO + TONE DEFEATRESET FOR C VERSIONVIDEO + TONE CONTROLSNTSC / PAL SELECTIONVIDEO + MEMORYVFD ALL DISPLAYAUDIO + TAPE MONITORAM FREQ. STEPAM/FM + FM MUTEDETAILS & WAVEFORMS ON SYSTEM TEST & DEBUGGINGT89C51RD2 (U202) main clock is at 20MHz (X202)T89C51RD2 (U201) main clock is at 20MHz (X201)UPPER - +5V supply to KEYBOARD when power upLOWER - RESET line (TCM810LENB713) whenpower upUPPER - OUTPUT ENABLE (pin 24) of EPROM(W27C02) when changing SURROUND MODESLOWER - CHIP ENABLE (pin 22) of EPROM(W27C02) when changing SURROUND MODESSCLK (pin 43 of CS49326)LRCLK (pin 42 of CS49326)MCLK (pin 30 of CS49326)NOTE: The waveforms are based on software version V1.26.11aR522R545R571R835P501P502P503R835R836R897P802P801P803J511BJ811BAMPLIFIER ADJUSTMENTIdle Current1.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 2mV reading on voltmeter.5.Leave power on for at least 5 min, and check for idle current again.6.Repeat for other channels.(IN FRONT POWER AMP PCB)CHANNELJUMPERVRFLP502R545FRP53R571CP503R571BSRP501R522(IN SURROUND POWER AMP PCB)CHANNELJUMPERVRSLP801R835SRP802R836BSLP803R897 ADJUSTMENT POINT DIAGRAMFRONT/CENTER AMPLIFIER BOARDSURROUND AMPLIFIER BOARDISC FRONT AMP BOARDISC SURROUND AMP BOARD11bISC Sensitivity Adjustment 1. Connect 8 ohm loading to all channels. 2. Rotate R8203 fully clockwise. 3. Load all channels at full power using 1kHz sine wave. 4. At this time, monitor the THD of the SL,SR,BS (L&R) output. Clipping should occur before full power achieved. 5. Rotate R834 counter-clockwise slowly until the THD just below 0.1%. 6. Repeat step 2-5 for R8103 but monitor FL, FR & Center output. 7. The procedure is finish at this step. 8. Load all channels at full power using 1kHz sine wave with 4 ohm load. 9. The clipping power(at THD 0.1%) should less than 100W for the T773.12PCB LAYOUTAUDIO BOARD - COMPONENT SIDEAUDIO BOARD - COPPER SIDE13COMPONENT VIDEO BOARD - COMPONENT SIDECOMPONENT VIDEO BOARD - COPPER SIDEDIGITAL BOARD - COMPONENT SIDEDIGITAL BOARD - COPPER SIDE14DSP BOARD - COPPER SIDEDSP BOARD - COMPONENT SIDE15FRONT/CENTER AMPLIFIER BOARD - COMPONENT SIDE16FRONT/CENTER AMPLIFIER BOARD - COPPER SIDE17SURROUND AMPLIFIER BOARD - COMPONENT SIDE18SURROUND AMPLIFIER BOARD - COPPER SIDE19KEY BOARD / LED BOARD- COMPONENT SIDEKEY BOARD / LED BOARD- COPPER SIDE20MAIN BOARD21aMULTI-CHANNEL BOARD- COMPONENT SIDE- COPPER SIDETRIGGER BOARD21bMULTI-CHANNEL BOARD- COMPONENT SIDE- COPPER SIDETRIGGER BOARDRLRLLRMULTI-CHANNEL BOARD MODIFIED TO BE USED WITH FIRST PRODUCTION MAIN BOARD22POWER SUPPLY (STANDBY)ISC FOR FRONT AMP BOARD- COMPONENT SIDE- COPPER SIDE23ISC FOR SURROUND AMP BOARD- COMPONENT SIDE- COPPER SIDECOMPOSITE VIDEO BOARD24PRE-OUT BOARD - COMPONENT SIDE25PRE-OUT BOARD - COPPER SIDE26SPEAKER TERMINAL BOARDPOWER SWITCH / VIDEO 6 BOARDSECONDARY BOARD27S-VIDEO BOARD28SCHEMATIC DIAGRAMAUDIO SWITCHRESISTORS : 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%.29COMPONENT VIDEORESISTORS : 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%.30E C B2SA933DTC144ESAE C BDTA144ESAE C BCOMPOSITE VIDEORESISTORS : 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%.31ISCE C B2SA10152SC1815E C B2SA1016KRNRNRNRNRESISTORS : RN-CERMIC CASE, MO-METAL OXIDE, F-FUSIBLE UNLESS OTHERWISESPECIFIED ARE CARBON FILM.NOTE:1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%.2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%.3. COMPONENTS MARKED “” ARE SAFETY CRITIAL PARTS.32POWER SUPPLY (SECONDARY)NOTE:1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%.2. COMPONENTS MARKED “” ARE SAFETY CRITIAL PARTS.33POWER SUPPLY (STAND BY)E C B2SC1815RESISTORS : 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.34TRIGGERRESISTORS : 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%.35VIDEO 6RESISTORS : 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%.36E C B2SA933E C B2SC1740E C B2SC18152SC2878DTC144ESADTC123ESADTA144ESAE C BS-VIDEORESISTORS : 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%.37E C B2SA10162SC2362B C E2SA16062SC4159B C E2SA20312SC5669E C B2SD600K2SD631KDTC123ESAE C BRNRNRNRNFRONT / CENTER / BACK SURROUND RIGHT AMPLIFIERNOTE:1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%.2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%.3. COMPONENTS MARKED “” ARE SAFETY CRITIAL PARTS.RESISTORS : RN-CERAMIC CASE, MO-METAL OXIDE, UNLESSOTHERWISE SPECIFIED ARE CARBON FILM.38SURROUND / BACK SURROUND LEFT AMPLIFIERE C B2SC2362E C B2SA10152SA1815B C E2SA16062SC4159B C E2SA20312SC5669E C B2SD600K