JVC-RX6042S-avr-sm1 维修电路原理图.pdf

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1、SERVICE MANUALCOPYRIGHT 2004 Victor Company of Japan, LimitedNo.MB2672004/6AUDIO/VIDEO CONTROL RECEIVERMB26720046RX-6042STABLE OF CONTENTS1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32S

2、PECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-43DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-54AD

3、JUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-135TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4、. 1-14TA/NEWS/INFODISPLAY MODE Area suffixA - AusitraliaRadioFans.CN 收音机爱 好者资料库1-2 (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.Amplifi

5、erOutput PowerAt Stereo operationFront channels100 W per channel, min. RMS, driven into 8 , 40 Hz to 20 kHz with no morethan 0.8% total harmonic distortion.At Surround operationFront channels100 W per channel, min. RMS, driven into 8 , at 1 kHz with no more than0.8% total harmonic distortion.Center

6、channel100 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

7、mV/47 kAudio Input (DIGITAL IN)*1CoaxialDIGITAL 1 (DVD)OpticalDIGITAL 2 (CD), DIGITAL 3 (TV):-21 dBm to -15 dBm (660 nm 30 nm)Recording Output LevelTAPE/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,

8、 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/ImpedanceComposite video:DVD, VCR1 V(p-p)/75 S-video:DVD, VCR(Y: luminance):1 V(p-p)/75 (C: chrominance, burst):0.286 V(p-p)/75

9、 ComponentDVD, VCR(Y: luminance):1 V(p-p)/75 (PB, PR):0.7 V(p-p)/75 Video Output LevelComposite 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 Synchroniza

10、tionNegativeSignal-to-Noise Ratio45 dBRadioFans.CN 收音机爱 好者资料库(No.MB267)1-3SECTION 1PRECAUTION1.1Safety 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

11、 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 produ

12、ct 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 charac

13、teristics. 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 Part

14、s 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 Pa

15、rts 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 fir

16、ehazard. 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

17、 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 aLeak

18、age 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

19、 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 anexposed metal part and a known good earth ground.Measure the AC voltage across the resistor with the ACvoltmeter. M

20、ove 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.). Thi

21、s 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 relevantsaf

22、ety 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

23、case ofpreforming 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

24、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

25、 10W0.15 F AC TYPE1-4 (No.MB267)SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.(No.MB267)1-5SECTION 3DISASSEMBLY3.1Removing the top cover (See Fig.1)(1) From the right and left sides of the main body, remove thefour screws A attaching the to

26、p 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.13.2Removing the front panel assembly (See Figs.2 and 3) Pr

27、ior 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 prote

28、ction 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.

29、(See Fig.3)Fig.2Fig.3BA1Top cover12ACCCFront panel assemblyCard wireCN201Power supply boardTiebandWireprotectionboardCardwireCN402Audio boardDFront panel assemblyD1-6 (No.MB267)3.3Removing the rear panel (See Fig.4) Prior to performing the following procedure, remove the topcover.(1) From the back s

30、ide 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.43.4Removing the component board and tuner unit (See Figs.5 and 6) Prior to performing the following procedure, remove th

31、e 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 ca

32、rdwire 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 boardParallel wireComponent boardTunerCN1GH(No.MB267)1-73.5Removing the DSP board, aud

33、io 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 boa

34、rd 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.73.6Removing the S-Video board (See Fig.8) Prior to performing the following procedure, remove the topco

35、ver 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 boardC

36、N511S-Video boardCN4611-8 (No.MB267)3.7Removing 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, di

37、sconnect 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 scr

38、ew K attaching the audio board.Fig.93.8Removing 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 boar

39、dCN402CN473CN471CN472Power supply boardCN491JJKRelay boardSoldered sections aParallelwiresSpeaker terminal board(No.MB267)1-93.9Removing 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

40、 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) Dis

41、connect 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 Natt

42、aching 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

43、 the twoscrews Q attaching the heat sink. (See Fig.13)Fig.12Fig.13MNSolderedsection bPowertransformerboard 1CN241PowersupplyboardTiebandWireprotectionboardCardwireCN251SpeakerterminalboardCN492TiebandsTiebandTiebandCN291CN472CN471CN473AudioboardParallelwiresRelayboardNNMLMainboardPPHeat sinkMain boa

44、rdHeat 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) Disco

45、nnect 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

46、. 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 si

47、de 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 bo

48、ard 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

49、 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)CN332CN331 CN312CN31

50、1CN321Main boardCN251Solderedsection cSolderedsections dSolderedsections eSolderedsections fTie bandTie bandPowertransformerPowertransformerboard 2Power cordRRTSRRPower transformer board 1Power/Fuseboard(No.MB267)1-113.14 Removing the power supply board (See Fig.16) Prior to performing the following