JVC-RXV7000UF-avr-sm 维修电路原理图.pdf

SERVICE MANUALCOPYRIGHT 2006 Victor Company of Japan, LimitedNo.MB5022006/1AUDIO/VIDEO CONTROL RECEIVERMB50220061RX-V7000UFLead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)TABLE OF CONTENTS1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-43DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-54ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-145TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15RadioFans.CN 收音机爱 好者资料库1-2 (No.MB502)SPECIFICATION* : 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 Power At Stereo operationFront channels100 W per channel, min. RMS, driven into 8 , at 1 kHz with no more than 0.8% total harmonic distortion (IEC268-3/DIN).Front channels100 W per channel, min. RMS, driven into 8 , at 1 kHz with no more than 0.8% total harmonic distortion.At Surround operationCenter channel100 W, min. RMS, driven into 8 , at 1 kHz with no more than 0.8% total harmonic distortion.Surround channels100 W per channel, min. RMS, driven into 8 , at 1 kHz with no more than 0.8% total harmonic distortion.AudioAudio Input Sensitivity/Impedance (1 kHz)TAPE, VCR, TV SOUND/DBS, DVD:220 mV/47 kAudio Input (DIGITAL IN)*CoaxialDIGITAL 1 (DVD):0.5 V(p-p)/75 OpticalDIGITAL 2 (VCR), DIGITAL 3 (TV SOUND/DBS):-21 dBm to -15 dBm (660 nm 30 nm)Recording Output LevelTAPE, VCR:220 mVSignal-to-Noise Ratio (66 IHF/DIN)TAPE, VCR, TV SOUND/DBS, DVD:96 dB/62 dBFrequency Response (8 )TAPE, VCR, TV SOUND/DBS, DVD:20 Hz to 50 kHz (+1 dB, -3 dB)Bass Boost+4 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, DBS1 V(p-p)/75 S-video:DVD, VCR,DBS(Y: luminance):1 V(p-p)/75 (C: chrominance, burst):0.3 V(p-p)/75 Component:DVD, VCR(Y: luminance):1 V(p-p)/75 (PB, PR):0.7 V(p-p)/75 Video Output LevelComposite video:VCR, MONITOR OUT 1 V(p-p)/75 S-video:VCR, MONITOR OUT(Y: luminance):1 V(p-p)/75 (C: chrominance, burst)0.3 V(p-p)/75 Component: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 SensitivityMonaural:12.8 dBf (1.2 V/75 )50 dB Quieting SensitivityMonaural:16.0 dBf (1.7 V/75 )Stereo:37.5 dBf (20.5 V/75 )Stereo Separation at OUT (REC)35 dB at 1 kHzAM tunerTuning Range531 kHz to 1 710 kHz (at 9 kHz intervals)530 kHz to 1 710 kHz (at 10 kHz intervals)GeneralPower RequirementsAC 220 V, 50 HzPower Consumption200 W (at operation)0.9 W (in standby mode)Dimensions (W H D)435 mm 200 mm 425 mmMass11.4 kgRadioFans.CN 收音机爱 好者资料库(No.MB502)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.MB502)SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.(No.MB502)1-5SECTION 3DISASSEMBLY3.1Removing 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 top side of the main body, remove the six screwsA attaching the top cover.(3) From the back side of the main body, remove the sixscrews B attaching the top cover.(4) 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.1AA112BATop cover1-6 (No.MB502)3.2Removing the front panel assembly (See Figs.2 and 3) Prior to performing the following procedure, remove the topcover.(1) From the top side of the main body, disconnect the cardwire from the connector CN402 on the front board. (SeeFig.2)(2) Disconnect the card wire from the connector CN201 on thepower supply board. (See Fig.2)(3) Remove the wire protection board fixing the card wire. (SeeFig.2)(4) Remove the four screws C attaching the front panel as-sembly. (See Fig.2)(5) Remove the four screws D attaching the stay bracket. (SeeFig.2)(6) From the bottom side of the main body, remove the fourscrews E attaching the front panel assembly. (See Fig.3)(7) Remove the front panel assembly in the direction of the ar-row. (See Fig.3)Fig.2Fig.3CDDCDCFront panel assemblyCN201Power supply boardWireprotectionboardCN402Front boardStay bracketEFront panel assemblyE(No.MB502)1-73.3Removing the rear panel (See Fig.4) Prior to performing the following procedure, remove the topcover and stay bracket.(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 thirty screws F attaching the rear panel.Fig.43.4Removing the component board and tuner unit (See Figs.5 and 6) Prior to performing the following procedure, remove the topcover and stay bracket.(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.6Rear panelFFStrain reliefFCN511S-Video boardComponent boardTunerCN1HGRear panel1-8 (No.MB502)3.5Removing the DSP board, audio input board, DVD board and video board (See Fig.7) Prior to performing the following procedure, remove the topcover, stay bracket and rear panel.(1) From the top side of the main body, disconnect the DSPboard from the connector CN481 on the front board.(2) Disconnect the audio input board from the connectorCN421 on the front board.(3) Disconnect the DVD board from the connector CN431 onthe front board.(4) Disconnect the video board from the connector CN441 onthe front board.Fig.73.6Removing the S-video board (See Fig.8) Prior to performing the following procedure, remove the topcover, stay bracket 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 front board.Fig.8CN481Front boardDVD boardVideo boardCN421Audio input boardDSPboardCN431 CN441Front boardCN511S-Video boardCN461(No.MB502)1-93.7Removing the front board (See Fig.9) Prior to performing the following procedure, remove the topcover, rear panel, stay bracket, component video board, DSPboard, audio input board, DVD board, video board, S-videoboard and tuner unit.(1) From the top side of the main body, disconnect the cardwire from the connector CN402 on the front board.(2) Disconnect the relay board from the connector CN491 onthe front board.(3) Disconnect the wires from the connectors CN471, CN472and CN473 on the front board.(4) Remove the three screws J attaching the front board.(5) Loosen the screw K attaching the front board.Fig.93.8Removing the speaker terminal board (See Fig.10) Prior to performing the following procedure, remove the topcover, stay bracket, component board and rear panel.(1) From the top side of the main body, remove the soldersfrom the soldered sections a on the speaker terminalboard.Fig.10Front boardCN472CN491Reray boardCN402CN473CN471JKJSoldered sections aSpeaker terminal board1-10 (No.MB502)3.9Removing the main board (See Fig.11) Prior to performing the following procedure, remove the topcover and stay bracket.(1) From the top side of the main body, remove the soldersfrom the soldered section b on the speaker terminal boardattaching the parallel wires.(2) Disconnect the relay board from the connectors CN291and CN491 on the power supply board and front board.(3) Disconnect the parallel wire from the connector CN241 onthe power supply board.(4) Disconnect the wire from the connector CN251 on the pow-er transformer board 1.(5) Disconnect the wires from the connectors CN471, CN472and CN473 on the front board.(6) Remove the screw M, two screws N and four screws P at-taching the main board.Fig.113.10 Removing the heat sink (See Figs.12 and 13) Prior to performing the following procedure, remove the topcover, stay bracket and main board.(1) Remove the ten screws Q attaching the heat sink of themain board. (See Fig.12)(2) From the reverse side of the main board, remove the twoscrews R attaching the heat sink. (See Fig.13)Fig.12Fig.13NPSolderedsection bPowertransformerboard 1CN241PowersupplyboardWireprotectionboardCN251SpeakerterminalboardCN491CN291CN472CN471CN473FrontboardRelayboardPPNMMainboardQQHeat sinkMain boardHeat sinkMain boardRR(No.MB502)1-113.11 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, stay bracket and main board.(1) Remove the ten screws Q attaching the heat sink of themain board. (See Fig.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 and stay bracket.(1) From the top side of the main body, remove the soldersfrom the soldered section c on the power transformerboard 1.(2) Remove the solders from the soldered sections d on thepower transformer board 2.(3) Disconnect the wire from the connector CN251 on the pow-er transformer board 1.(4) Remove the four screws S attaching the power transform-er.3.13 Removing the power/fuse board (See Fig.15) Prior to performing the following procedure, remove the topcover and stay bracket.(1) From the back and top sides of the main body, remove thescrew T an