Jvc-RX-6042-S-Service-Manual电路原理图.pdf

SERVICE MANUALCOPYRIGHT © 2004 Victor Company of Japan, LimitedNo.MB2672004/6AUDIO/VIDEO CONTROL RECEIVERMB26720046RX-6042STABLE OF CONTENTS1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-43 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-54 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-135 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14TA/NEWS/INFODISPLAY MODEArea suffixA - Ausitralia1-2 (No.MB267)SPECIFICATION*1: Corresponding to Linear PCM, Dolby Digital, and DTS Digital Surround (with sampling frequency-32 kHz, 44.1 kHz, 48 kHz)Designs and specifications are subject to change without notice.AmplifierOutput PowerAt Stereo operation Front channels 100 W per channel, min. RMS, driven into 8 , 40 Hz to 20 kHz with no morethan 0.8% total harmonic distortion.At Surround operation Front channels 100 W per channel, min. RMS, driven into 8 , at 1 kHz with no more than0.8% total harmonic distortion.Center channel 100 W, min. RMS, driven into 8 , at 1 kHz with no more than 0.8% totalharmonic distortion.Surround chan-nels100 W per channel, min. RMS, driven into 8 , at 1 kHz with no more than0.8% total harmonic distortion.AudioAudio Input Sensitivity/Impedance (1 kHz)CD, TAPE/CDR, VCR, TV SOUND, DVD:220 mV/47 kAudio Input (DIGITAL IN)*1 Coaxial DIGITAL 1 (DVD)Optical DIGITAL 2 (CD), DIGITAL 3 (TV):-21 dBm to -15 dBm (660 nm ±30 nm)Recording Output Level TAPE/CDR, VCR:220 mVSignal-to-Noise Ratio ('66 IHF/'78 IHF)CD, TAPE/CDR, VCR, TV SOUND, DVD:87 dB/62 dBFrequency Response (8 ) CD, TAPE/CDR, VCR, TV SOUND, DVD:20 Hz to 50 kHz (+1 dB, -3 dB)Bass Boost +3 dB ±1 dB at 100 HzEqualization (5 bands) 63 Hz, 250 Hz, 1 kHz, 4 kHz, 16 kHz:±8 dB (in 2 dB steps)VideoVideo Input Sensitivity/Impedance Composite video:DVD, VCR 1 V(p-p)/75 S-video:DVD, VCR (Y: luminance):1 V(p-p)/75 (C: chrominance, burst):0.286 V(p-p)/75 ComponentDVD, VCR (Y: luminance):1 V(p-p)/75 (PB, PR):0.7 V(p-p)/75 Video Output Level Composite video:VCR, MONITOROUT1 V(p-p)/75 S-video:VCR, MONITOR OUT (Y: luminance):1 V(p-p)/75 :0.286 V(p-p)/75 (C: chrominance, burst)ComponentMONITOR OUT (Y: luminance):1 V(p-p)/75 (PB, PR)0.7 V(p-p)/75 Synchronization NegativeSignal-to-Noise Ratio 45 dB(No.MB267)1-3SECTION 1PRECAUTION1.1 Safety Precautions(1) This design of this product contains special hardware andmany circuits and components specially for safetypurposes. For continued protection, no changes should bemade to the original design unless authorized in writing bythe manufacturer. Replacement parts must be identical tothose used in the original circuits. Services should beperformed 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. Thesecharacteristics are often not evident from visual inspectionnor can the protection afforded by them necessarily beobtained by using replacement components rated forhigher voltage, wattage, etc. Replacement parts whichhave these special safety characteristics are identified inthe Parts List of Service Manual. Electrical componentshaving such features are identified by shading on theschematics and by ( ) on the Parts List in the ServiceManual. The use of a substitute replacement which doesnot have the same safety characteristics as therecommended replacement parts shown in the Parts List ofService Manual may create shock, fire, or other 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, afterreassembling.(5) Leakage shock hazard testingAfter reassembling the product, always perform anisolation check on the exposed metal parts of the product(antenna 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 a“Leakage Current Tester“, measure the leakage currentfrom each exposed metal parts of the cabinet,particularly any exposed metal part having a return pathto the chassis, to a known good earth ground. Anyleakage current 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 0.15µF AC-type capacitor between anexposed 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.). 1.2 Warning(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.1.3 CautionBurrs formed during molding may be left over on some partsof the chassis. Therefore, pay attention to such burrs in the case ofpreforming repair of this system.1.4 Critical 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.MB267)SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.(No.MB267)1-5SECTION 3DISASSEMBLY3.1 Removing the top cover (See Fig.1)(1) From the right and left sides of the main body, remove thefour screws 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 thedirection of the arrow 1.Fig.13.2 Removing the front panel assembly (See Figs.2 and 3) Prior to performing the following procedure, remove the topcover.(1) Disconnect the card wire from the connector CN402 on theaudio board. (See Fig.2)(2) Disconnect the card wire from the connector CN201 on thepower supply board. (See Fig.2)(3) Remove the tie bands. (See Fig.2)(4) Remove the wire protection board fixing the card wire. (SeeFig.2)(5) Remove the three screws C attaching the front panelassembly. (See Fig.2)(6) From the bottom side of the main body, remove the fourscrews D attaching the front panel assembly. (See Fig.3)(7) Remove the front panel assembly in the direction of thearrow. (See Fig.3)Fig.2Fig.3BA1Top cover12AC C CFront panel assemblyCard wireCN201Power supply boardTiebandWireprotectionboardCardwireCN402Audio boardDFront panel assemblyD1-6 (No.MB267)3.3 Removing the rear panel (See Fig.4) Prior to performing the following procedure, remove the topcover.(1) From the back side of the main body, remove the strainrelief from the rear panel in the direction of the arrow.(2) Remove the twenty-seven screws E and four screws Fattaching the rear panel.Fig.43.4 Removing the component board and tuner unit (See Figs.5 and 6) Prior to performing the following procedure, remove the topcover.(1) From the top side of the main body, disconnect the parallelwire from the connector CN511 on the S-Video board. (SeeFig.5)(2) From the back side of the main body, remove the fourscrews G attaching the component board. (See Fig.6)(3) From the top side of the main body, disconnect the cardwire from the connector CN1 on the tuner unit. (See Fig.5)(4) From the back side of the main body, remove the twoscrews H attaching the tuner unit. (See Fig.6)Fig.5Fig.6FRear panelEFEEStrain reliefFECN511S-Video board Parallel wireComponent boardTunerCN1GH(No.MB267)1-73.5 Removing the DSP board, audio input board, DVD board and video board (See Fig.7) Prior to performing the following procedure, remove the topcover and rear panel.(1) From the top side of the main body, Remove the tie band.(2) Disconnect the DSP board from the connector CN481 onthe audio board.(3) Disconnect the audio input board from the connectorCN421 on the audio board.(4) Disconnect the DVD board from the connector CN431 onthe audio board.(5) Disconnect the video board from the connector CN441 onthe audio board.Fig.73.6 Removing the S-Video board (See Fig.8) Prior to performing the following procedure, remove the topcover and rear panel.(1) From the top side of the main body, disconnect the parallelwire from the connector CN511 on the S-Video board.(2) Disconnect the S-Video board from the connector CN461on the audio board.Fig.8CN481Audio boardDVD boardVideo boardCN421AudioinputboardDSPboardCN431CN441Audio boardCN511S-Video boardCN4611-8 (No.MB267)3.7 Removing the audio board (See Fig.9) Prior to performing the following procedure, remove the topcover, rear panel, component video board, DSP board, audioinput board, DVD board, video board, S-Video board and tunerunit.(1) From the top side of the main body, disconnect the cardwire from the connector CN402 on the audio board.(2) Disconnect the relay board from the connector CN491 onthe audio board.(3) Disconnect the wires from the connectors CN471, CN472and CN473 on the audio board.(4) Remove the three screws J attaching the audio board.(5) Loosen the screw K attaching the audio board.Fig.93.8 Removing the speaker terminal board (See Fig.10) Prior to performing the following procedure, remove the topcover and rear panel.(1) From the top side of the main body, remove the soldersfrom the soldered sections a on the speaker terminalboard.Fig.10Audio boardCN402CN473CN471CN472Power supply boardCN491JJKRelay boardSoldered sections aParallelwiresSpeaker terminal board(No.MB267)1-93.9 Removing the main board (See Fig.11) Prior to performing the following procedure, remove the topcover.(1) From the top side of the main body, remove the tie bandsfixing the wires.(2) Remove the tie band and wire protection board fixing thecard wire.(3) Remove the solders from the soldered section b on thespeaker terminal board attaching the parallel wires.(4) Disconnect the relay board from the connectors (CN291,CN491) on the power supply board and audio board.(5) Disconnect the parallel wire from the connector CN241 onthe power supply board.(6) Disconnect the wire from the connector CN251 on thepower transformer board 1.(7) Disconnect the wires from the connectors CN471, CN472and CN473 on the audio board.(8) Remove the screw L, two screws M and four screws Nattaching the main board.(9) Take out the main board.Fig.113.10 Removing the heat sink(See Figs.12 and 13) Prior to performing the following procedure, remove the topcover and main board.(1) Remove the ten screws P attaching the heat sink. (SeeFig.12)(2) From the reverse side of the main board, remove the twoscrews Q attaching the heat sink. (See Fig.13)Fig.12Fig.13MNSolderedsection bPowertransformerboard 1CN241PowersupplyboardTiebandWireprotectionboardCardwireCN251SpeakerterminalboardCN492TiebandsTiebandTiebandCN291CN472CN471CN473AudioboardParallelwiresRelayboardNNMLMainboardPPHeat sinkMain boardHeat sinkMain boardQQ1-10 (No.MB267)3.11 Removing the center amp. board, front amp. boards (L/R) and rear amp. boards (L/R) (See Figs.12 and 14) Prior to performing the following procedure, remove the topcover and main board.(1) Remove the ten screws P attaching the heat sink. (SeeFig.12)(2) Disconnect the center amp. board from the connectorCN321 on the main board. (See Fig.14)(3) Disconnect the front amp. board (L) from the connectorCN311 on the main board. (See Fig.14)(4) Disconnect the front amp. board (R) from the connectorCN312 on the main board. (See Fig.14)(5) Disconnect the rear amp. board (L) from the connectorCN331 on the main board. (See Fig.14)(6) Disconnect the rear amp. board (R) from the connectorCN332 on the main board. (See Fig.14)Fig.143.12 Removing the power transformer (See Fig.15) Prior to performing the following procedure, remove the topcover.(1) From the top side of the main body, remove the tie bandsfixing the wires.(2) Remove the solders from the soldered section c on thepower transformer board 1.(3) Remove the solders from the soldered sections d on thepower transformer board 2.(4) Disconnect the wire from the connector CN251 on thepower transformer board 1.(5) Remove the four screws R attaching the powertransformer.3.13 Removing the power/fuse board (See Fig.15) Prior to performing the following procedure, remove the topcover.(1) From the back and top sides of the main body, remove thescrew S and screw T attaching the power/fuse board.(2) Remove the solders from the soldered sections e attachingthe power cord.(3) From the reverse side of the power/fuse board, remove thesolders from the soldered sections f attaching the wires.Fig.15Rear amp.board (R)Front amp.board (R)Center amp.boardRear amp.board (L)Front amp.board (L)CN332 CN331 CN312 CN311 CN321Main boardCN251Solderedsection cSolderedsections dSolderedsections eSolderedsections fTie bandTie bandPowertransformerPowertransformerboard 2Power cordRRTSRRPower transformer board 1Power/Fuseboard