JVC-RX8040B-avr-sm 维修电路原理图.pdf

SERVICE MANUALCOPYRIGHT 2004 Victor Company of Japan, LimitedNo.MB3032004/7AUDIO/VIDEO CONTROL RECEIVERMB30320047RX-8040BTABLE OF CONTENTS1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-43DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-54ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-155TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16Area suffixUJ - U.S.MilitaryRadioFans.CN 收音机爱 好者资料库1-2 (No.MB303)SPECIFICATION*1: Measured on AC 110 V, 127 V, 220 V and 240 V*2: Corresponding to Linear PCM, Dolby Digital, and DTS (with sampling frequency -32 kHz, 44.1 kHz, 48 kHz).Designs & specifications are subject to change without notice.AmplifierOutput Power At Stereo Operation Front Channel100 W*1 per channel, min. RMS, driven into 8 at 1 kHz with no more than 0.8% total harmonic distortion (IEC268-3/DIN).At Surround Opera-tionFront Channel100 W*1 per channel, min. RMS, driven into 8 at 1 kHz, with no more than 0.8% total harmonic distortion.Center Channel100 W*1, min. RMS, driven into 8 at 1 kHz, with no more than 0.8% total harmonic distortion.Surround Channel100 W*1 per channel, min. RMS, driven into 8 at 1 kHz, with no more than 0.8% total harmonic distortion.Surround Back Channel 100 W*1, min. RMS, driven into 8 at 1 kHz, with no more than 0.8% total harmonic distortion.AudioAudio Input Sensitivity/Impedance (1 kHz)DVD IN, VCR 1 IN, VCR 2 IN, TV SOUND/DBS IN, VIDEO:200 mV/47 kTAPE/MD IN, CDR IN, CD IN:200 mV/47 kPHONO IN (MM):2.5 mV/47 kAudio Input (DIGI-TAL IN)*2CoaxialDIGITAL 1 (DVD):0.5 V(p-p)/75 OpticalDIGITAL 2 (CD), DIGITAL 3 (TV), DIGITAL 4 (CDR):-21 dBm to -15 dBm (660 nm 30 nm)Audio Output LevelZONE 2 PREOUT:1 VPREOUT:1 VRecording Output LevelTAPE/MD OUT, CDR OUT, VCR 1 OUT, VCR 2 OUT:200 mVDigital Output (DIGITAL OUT):OpticalSignal wave length:660 nmOutput level:-21 dBm to -15 dBmSignal-to-Noise Ratio (66 IHF/78 IHF)DVD IN, VCR 1 IN, VCR 2 IN, TV SOUND/DBS IN, VIDEO:87 dB/80 dBTAPE/MD IN, CDR IN, CD IN:87 dB/80 dBPHONO IN (MM):70 dB/78 dB at OUT (REC)Frequency Response (8 )DVD IN, VCR 1 IN, VCR 2 IN, TV SOUND/DBS IN, VIDEO:20 Hz to 100 kHz (+1 dB, -3 dB)TAPE/MD IN, CDR IN, CD IN:20 Hz to 100 kHz (+1 dB, -3 dB)PHONO IN (MM):20 Hz to 20 kHz (1 dB)RIAA Phono Equalization1.0 dB (20 Hz to 20 kHz)Bass Boost+6 dB 1.0 dB at 100 HzEqualization63 Hz, 250 Hz, 1 kHz, 4 kHz, 16 kHz: 8 dB (in 2 dB steps)VideoVideo Input Sensitivity/ImpedanceComposite Video:DVD IN, TV SOUND/DBS IN, VCR 1 IN, VCR 2 IN, VIDEO1 V(p-p)/75 S-video:DVD IN, TV SOUND/DBS IN, VCR 1 IN, VCR 2 IN, VIDEO(Y: luminance):1 V(p-p)/75 (C: chrominance, burst):0.286 V(p-p)/75 Component Video :DVD IN, DBS (VCR 1) IN(Y: luminance):1 V(p-p)/75 (PB/PR):0.7 V(p-p)/75 Video Output LevelComposite Video:VCR 1 OUT, VCR 2 OUT, MONITOR OUT1 V(p-p)/75 S-video:VCR 1 OUT, VCR 2 OUT, MONI-TOR OUT(Y: luminance):1 V(p-p)/75 (C: chrominance, burst):0.286 V(p-p)/75 Composite Video:MONITOR OUT(Y: luminance):1 V(p-p)/75 (PB/PR):0.7 V(p-p)/75 SynchronizationNegativeSignal-to-Noise Ratio45 dBFM tuner (IHF)Tuning Range87.50 MHz to 108.00 MHzUsable SensitivityMonaural12.8 dBf (1.2 V/75 )50 dB Quieting SensitivityMonaural16.0 dBf (1.7 V/75 )Stereo37.5 dBf (20.5 V/75 )Stereo Separation at OUT (REC)35 dB at 1 kHzAM tunerTuning Range531 kHz to 1 602 kHz (at 9 kHz intervals)530 kHz to 1 600 kHz (at 10 kHz intervals)GeneralPower RequirementsAC 110 V/127 V/220 V/230 V - 240 V , adjustable with the voltage selector, 50 Hz/60 HzPower Consumption220 W (at operation) 6.0 W (in standby mode)Dimensions (W H D)435 mm 157 mm 425 mmMass12.4 kgRadioFans.CN 收音机爱 好者资料库(No.MB303)1-3SECTION 1PRECAUTION1.1Safety Precautions(1) This design of this product contains special hardware andmany circuits and components specially for safety purpos-es. For continued protection, no changes should be madeto the original design unless authorized in writing by themanufacturer. Replacement parts must be identical tothose used in the original circuits. Services should be per-formed by qualified personnel only.(2) Alterations of the design or circuitry of the product shouldnot be made. Any design alterations of the product shouldnot be made. Any design alterations or additions will voidthe manufacturers warranty and will further relieve themanufacture of responsibility for personal injury or propertydamage resulting therefrom.(3) Many electrical and mechanical parts in the products havespecial safety-related characteristics. These characteris-tics are often not evident from visual inspection nor can theprotection afforded by them necessarily be obtained by us-ing replacement components rated for higher voltage, watt-age, etc. Replacement parts which have these specialsafety characteristics are identified in the Parts List of Ser-vice Manual. Electrical components having such featuresare identified by shading on the schematics and by ( ) onthe Parts List in the Service Manual. The use of a substitutereplacement which does not have the same safety charac-teristics as the recommended replacement parts shown inthe Parts List of Service Manual may create shock, fire, orother hazards.(4) The leads in the products are routed and dressed with ties,clamps, tubings, barriers and the like to be separated fromlive parts, high temperature parts, moving parts and/orsharp edges for the prevention of electric shock and firehazard. When service is required, the original lead routingand dress should be observed, and it should be confirmedthat they have been returned to normal, after reassem-bling.(5) Leakage shock hazard testingAfter reassembling the product, always perform an isola-tion check on the exposed metal parts of the product (an-tenna terminals, knobs, metal cabinet, screw heads,headphone jack, control shafts, etc.) to be sure the productis safe to operate without danger of electrical shock.Do notuse a line isolation transformer during this check. Plug the AC line cord directly into the AC outlet. Using aLeakage Current Tester, measure the leakage currentfrom each exposed metal parts of the cabinet, particular-ly any exposed metal part having a return path to thechassis, to a known good earth ground. Any leakage cur-rent must not exceed 0.5mA AC (r.m.s.). Alternate check methodPlug the AC line cord directly into the AC outlet. Use anAC voltmeter having, 1,000 per volt or more sensitivityin the following manner. Connect a 1,500 10W resistorparalleled by a 0.15F AC-type capacitor between an ex-posed metal part and a known good earth ground.Measure the AC voltage across the resistor with the ACvoltmeter. Move the resistor connection to each exposed metalpart, particularly any exposed metal part having a returnpath to the chassis, and measure the AC voltage acrossthe resistor. Now, reverse the plug in the AC outlet andrepeat each measurement. Voltage measured any mustnot exceed 0.75 V AC (r.m.s.). This corresponds to 0.5mA AC (r.m.s.). 1.2Warning(1) This equipment has been designed and manufactured tomeet international safety standards.(2) It is the legal responsibility of the repairer to ensure thatthese safety standards are maintained.(3) Repairs must be made in accordance with the relevantsafety standards.(4) It is essential that safety critical components are replacedby approved parts.(5) If mains voltage selector is provided, check setting for localvoltage.1.3CautionBurrs formed during molding may be left over on some partsof the chassis. Therefore, pay attention to such burrs in the case of pre-forming repair of this system.1.4Critical parts for safetyIn regard with component parts appearing on the silk-screenprinted side (parts side) of the PWB diagrams, the parts that areprinted over with black such as the resistor ( ), diode ( )and ICP ( ) or identified by the mark nearby are criticalfor safety. When replacing them, be sure to use the parts of thesame type and rating as specified by the manufacturer. (This regulation dose not Except the J and C version)Good earth groundPlace this probe on each exposedmetal part.AC VOLTMETER(Having 1000 ohms/volts,or more sensitivity)1500 10W0.15 F AC TYPE1-4 (No.MB303)SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.(No.MB303)1-5SECTION 3DISASSEMBLY3.1Removing the top cover (See Fig.1)(1) From the both sides of the main body, remove the fourscrews A attaching the top cover.(2) From the back side of the main body, remove the threescrews B attaching the top cover.(3) Remove the top cover in the direction of the arrow 2 whileextending the lower sections of the top cover in the direc-tion of the arrow 1.Fig.13.2Removing the rear panel (See Fig.2) Prior to performing the following procedures, remove the topcover.(1) From the back side of the main body, remove the strain re-lief from the rear panel in the direction of the arrow.(2) Remove the three screws C, thirty-five screws D, twoscrews E, two screws F and nut a attaching the rear panel.3.3Removing the RF unit and compu board (See Figs.2 and 3) Prior to performing the following procedures, remove the topcover.(1) From the top side of the main body, cut off the tie band.(See Fig.3)(2) Disconnect the wire from the connector CN1 on the RFunit. (See Fig.3)(3) From the back side of the main body, remove the nut a at-taching the RF unit. (See Fig.2)(4) From the top side of the main body, disconnect the wirefrom the connector CN262 on the relay board. (See Fig.3)(5) From the back side of the main body, remove the twoscrews F attaching the compu board. (See Fig.2)Fig.2Fig.3Top coverA211BACStrain reliefCRear panelDCDDEDDFNut aCN262 Relay boardCN1Compu boardRF unitTie band1-6 (No.MB303)3.4Removing the I/O board (See Fig.4) Prior to performing the following procedures, remove the topcover and rear panel.(1) From the top side of the main body, remove the two plasticrivets in the direction of the arrow 1, and remove the stop-per boards in the direction of the arrow 2.(2) Cut off the tie bands bundling the wires.(3) Disconnect the wire from the connector CN722 on the cen-ter board.(4) Disconnect the wire from the connector CN714 on the frontboard (L).(5) Disconnect the wire from the connector CN717 on the sur-round back board.(6) Disconnect the wire from the connector CN719 on the frontboard (R).(7) Disconnect the wire from the connector CN723 on the mainboard.(8) Disconnect the I/O board from the connectors (CN205,CN361, CN381 and CN501) in an upward direction.Fig.4122CN381CN205CN501Plastic rivetPlasticrivetStopperboardStopper boardTiebandCenter boardFront board(L)Surround back boardFrontboard(R)CN719CN717CN714CN722CN723MainboardI/O board1CN361Tiebands(No.MB303)1-73.5Removing the front panel assembly (See Figs.5 and 6) Prior to performing the following procedures, remove the topcover, rear panel and I/O board.(1) From the top side of the main body, remove the tie bandsbundling the wires. (See Fig.5)(2) Disconnect the wire from the connector CN599 on the DSPboard. (See Fig.5)(3) Disconnect the wire from the connector CN415 on theaudio2 board. (See Fig.5)(4) Disconnect the wire from the connector CN206 on the vid-eo board. (See Fig.5)(5) Disconnect the wire from the connector CN244 on the S-Video board. (See Fig.5)(6) Disconnect the card wire from connector CN402 on thepower supply board. (See Fig.5)(7) Disconnect the card wire from connector CN400 on the mi-con board. (See Fig.5)(8) Remove the tie band and wire protection board fixing thecard wire. (See Fig.5)(9) Remove the two screws G, screws G and screw H attach-ing the front panel assembly. (See Fig.5)(10) From the bottom side of the main body, remove the fourscrews J attaching the front panel assembly. (See Fig.6)(11) Remove the front panel assembly in the direction of the ar-row. (See Fig.6)Reference:When attaching the screw G and screw H, attach the earthwire with it.Fig.5Fig.6GGGHFront panel assemblyEarth wireEarth wireCN402PowersupplyboardTiebandTiebandMiconboardCN244S-Video boardVideo boardCN206CN415Audio2 boardCN599DSPboardCN400TiebandCardwireTiebandWireprotectionboardJJFront panel assembly1-8 (No.MB303)3.6Removing the tuner, DSP board, Audio board, Audio2 board, Video board and S-Video board (See Fig.7) Prior to performing the following procedures, remove the topcover, rear panel and I/O board.(1) From the top side of the main body, cut off the tie band bun-dling the wire.(2) Disconnect the card wire from connector CN314 on the au-dio board, and take out the tuner.(3) Disconnect the wire from the connector CN599 on the DSPboard.(4) Disconnect the DSP board from the connector CN601 onthe micon board, and take out the DSP board.(5) Disconnect the audio board from the connectors (CN101and CN303) on the micon board, and take out the audioboard.(6) Disconnect the wire from the connector CN415 on theaudio2 board.(7) Disconnect the audio2 board from the connector CN301 onthe micon board, and take out the audio2 board.(8) Disconnect the wire from the connector CN206 on the vid-eo board.(9) Disconnect the video board from the connector CN201 onthe micon board, and take out the video board.(10) Disconnect the wire from the connector CN244 on the S-Video board.(11) Disconnect the S-Video board from the connector CN241on the micon board, and take out the S-Video board.Fig.73.7Removing the micon board (See Fig.8) Prior to performing the following procedures, remove the topcover, rear panel, I/O board, tuner, DSP board, Audio board,Audio2 board, Video board and S-Video board.(1) From the top side of the main body, disconnect the cardwire from the connector CN400 on the micon board.(2) Disconnect the relay board from the connector CN81 onthe micon board.(3) Disconnect the parallel wire from the connectors (CN931and CN932) on the micon board.(4) Disconnect the parallel wire from the connector CN831 onthe main board.(5) Remove the three screws K attaching the micon board.(6) Remove the three screws L attaching the transistors(Q921, Q931, and Q941) to the chassis base.(7) Loosen the screw M attaching the micon board.Fig.8CN314TunerAudio boardCard wireCN601DSPboardCN303TiebandCN101Video boardS-video boardCN206CN244Micon boardCN415Audio2 boardCN599CN301CN201 CN241CN400MiconboardRelayboardCN81CardwireCN931 CN932KKKLTransistors(Q921,Q931,Q941)Chassis baseMCN831Main board(No.MB303)1-93.8Removing the speaker board (See Fig.9) Prior to performing the following procedures, remove the topcover, rear panel.(1) From the top side of the main body, remove the tie bandbundling the wires.(2) Disconnect the wires