JVC-RX8012PSL-avr-sm 维修电路原理图.pdf

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1、SERVICE MANUALAUDIO/VIDEO CONTROL RECEIVERNo.21066Feb. 2002COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.RX-8012PSLRX-8012PSLContentsSafety precautions -1-2Disassembly method -1-3Adjustment method -1-9Self-diagnose function -1-10Description of major ICs -1-1226Area suffixUS - SingaporeD I G I T A LCON

2、TROL+231564897/P0+1010LINE DIF .ECTBOOSTEFFECTMENUENTERSIZEROOMBASSMODETESTCTR TONELIVENESSMIDNIGHTSOUNDSUBWFRDIGITAL EQREAR L REAR RL/R BALCENTERMUTINGCH/LEVEL TV VOLPLAYSTOP/REWDOWN TUNING UPFF/EXITBAL LBAL RVOLUMECATV/DBSCONTROLTV/VIDEOMENUTEXTRECDISPLAYPAUSEPAUSESETRETURNFM MODE100+CONTROLA/V CO

3、NTROL RECEIVERCATV/DBSVCR 1TVAUDIODSPMODEINPUTON/OFFDVD MUILTIDVDUSBCDCDRTAPE/MDTV/DBSVIDEOPHONOFM/AMVCR 1VCR 2SURROUNDANALOG/DIGITALSLEEPCONTROLDOWNUPEFFECTSETTINGDIGITALEQTV SOUND/DBSVIDEOVCR 2VCR 1DVDDVD MULTIMIDNIGHT MODEDSP MODES-VIDEOVIDEOVIDEOLAUDIORSURROUND ON/OFFSUBWOOFER OUT ON/OFFSPEAKERS

4、 ON/OFFFM/AM TUNINGFM/AM PRESETFM MODEMEMORYPHONES1STANDBYUSB AUDIOPUSH OPENINPUTANALOG/DIGITALINPUT ATTFM / AMUSB AUDIOTAPE / MDCDRCDPHONOLEVELADJUSTAUDIO/VIDEO CONTROL RECEIVERLINE DIRECTBASS BOOSTMASTER VOLUMED I G I T A LSURROUNDD I G I T A L2SOUCE NAMESOUCE NAMESTANDBY/ONRadioFans.CN 收音机爱 好者资料库

5、RX-8012PSL1-21. This design of this product contains special hardware and many circuits and components specially for safety purposes. For continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replacement parts must be identical to th

6、ose used in the original circuits. Services should be performed by qualified personnel only.2. Alterations of the design or circuitry of the product should not be made. Any design alterations of the product should not be made. Any design alterations or additions will void the manufacturers warranty

7、and will further relieve the manufacture of responsibility for personal injury or property damage resulting therefrom.3. Many electrical and mechanical parts in the products have special safety-related characteristics. These characteristics are often not evident from visual inspection nor can the pr

8、otection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in the Parts List of Service Manual. Electrical components having such features are identified by

9、 shading on the schematics and by ( ) on the Parts List in the Service Manual. The use of a substitute replacement which does not have the same safety characteristics as the recommended replacement parts shown in the Parts List of Service Manual may create shock, fire, or other hazards.4. The leads

10、in the products are routed and dressed with ties, clamps, tubings, barriers and the like to be separated from live parts, high temperature parts, moving parts and/or sharp edges for the prevention of electric shock and fire hazard. When service is required, the original lead routing and dress should

11、 be observed, and it should be confirmed that they have been returned to normal, after re-assembling.5. Leakage currnet check (Electrical shock hazard testing)After re-assembling the product, always perform an isolation check on the exposed metal parts of the product (antenna terminals, knobs, metal

12、 cabinet, screw heads, headphone jack, control shafts, etc.) to be sure the product is safe to operate without danger of electrical shock.Do not use 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 c

13、urrent from each exposed metal parts of the cabinet, particularly any exposed metal part having a return path to the chassis, to a known good earth ground. Any leakage current must not exceed 0.5mA AC (r.m.s.).Alternate check methodPlug the AC line cord directly into the AC outlet. Use an AC voltmet

14、er having, 1,000 ohms per volt or more sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by a 0.15 F AC-type capacitor between an exposed metal part and a known good earth ground.Measure the AC voltage across the resistor with the AC voltmeter. Move the resistor connection

15、 to each exposed metal part, particularly any exposed metal part having a return path to the chassis, and meausre the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. Voltage measured any must not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5 m

16、A AC (r.m.s.). 1. This equipment has been designed and manufactured to meet international safety standards.2. It is the legal responsibility of the repairer to ensure that these safety standards are maintained.3. Repairs must be made in accordance with the relevant safety standards.4. It is essentia

17、l that safety critical components are replaced by approved parts.5. If mains voltage selector is provided, check setting for local voltage.Good earth groundPlace this probe on each exposedmetal part.AC VOLTMETER(Having 1000 ohms/volts,or more sensitivity)1500 10W0.15 F AC TYPE!Burrs formed during mo

18、lding may be left over on some parts of the chassis. Therefore, pay attention to such burrs in the case of preforming repair of this system.In regard with component parts appearing on the silk-screen printed side (parts side) of the PWB diagrams, the parts that are printed over with black such as th

19、e resistor ( ), diode ( ) and ICP ( ) or identified by the mark nearby are critical for safety. (This regulation does not correspond to J and C version.)RadioFans.CN 收音机爱 好者资料库RX-8012PSL1-3Remove the four screws A attaching the top cover on both sides of the body.Remove the three screws B on the bac

20、k of the body.Remove the top cover from behind in the direction of the arrow while pulling both sides outward.1.2.3.Disassembly methodRemoving the top cover (See Fig.1)Prior to performing the following procedure, remove the top cover.Remove the power cord stopper from the rear panel by moving it in

21、the direction of the arrow.Remove the thirty six screws E attaching the each board to the rear panel.Remove the three screws F attaching the rear panel on the back of the body.1.2.3.Removing the rear panel (See Fig.4)Prior to performing the following procedure, remove the top cover.Cut off the tie b

22、ands.Disconnect the harness from the connector CN416 (on the video audio board), CN206 (on the video board) and CN244 (on the S video board) (see fig.8).Disconnect the card wire from the connector CN400 on the audio board and CN402 on the power supply board.Remove the three screws C which fix the up

23、per surface of the front panel, and four screws D which fix the bottom.Detach the front panel assembly toward the front.Remove the screw P attaching the bracket for headphone jack and remove the earth wire (see fig. 19).1.2.3.4.5.6.Removing the front panel assembly (See Fig.2 and 3)Fig.1Fig.2Fig.3Fi

24、g.4A 2BTop coverCCPower supply boardAudioboardCN400Main boardEFEFFCord stopperFront panel assemblyFront panel assemblyDRear panelTTie bandEEEERX-8012PSL1-4Prior to performing the following procedure, remove the top cover and rear panel.Cut off the tie bands.Disconnect the harness from the connector

25、CN721, CN723 on the main board and CN722 on the center amp. board.Remove the fastener which is fixing the small board to the audio input board.Draw out the DVD board upwards, disconnecting the connector CN501, CN243, CN205, CN381 and CN361 on the DVD board.1.2.3.4.Removing the DVD board (See Fig.5 a

26、nd 6)Prior to performing the following procedure, remove the top cover, rear panel and DVD board.Remove the tuner board from the connector CN101 on the audio board.Remove the audio input board from the connector CN301 on the audio board.Disconnect the harness from the connector CN416 and remove the

27、video audio board from the connector CN303 on the audio board.Disconnect the harness from the connector CN206 and remove the video board from the connector CN201 on the audio board.Disconnect the harness from the connector CN244 and remove the S video board from the connector CN241 on the audio boar

28、d.Remove the DSP board from the connector CN601 on the audio board.1.2.3.4.6.7.Removing the each board of the tuner, the audio input, the video audio, the video, the S video and the DSP (See Fig.7 to 10)Fig.5Fig.6Fig.8Tie bandCN101CN723Tuner boardCN721CN722 (onthe centeramp. board)DVD boardMainboard

29、CN361CN381CN243CN501CN205CN303CN201CN241Audio boardFig.7Audio input boardAudio input boardFastenerSmall boardVideo boardS Video boardVideo audio boardDSP boardCN301CN101Video boardS Video boardCN244Video audio boardCN206CN416DVD boardRX-8012PSL1-5Removing the audio board (See Fig.11 and 12)Prior to

30、performing the following procedure, remove the top cover, rear panel, DVD board, tuner board, audio input board, video audio board, video board, S video board and DSP board.Disconnect the harness from the connector CN813 and CN814 on the main board.Disconnect the harness from the connector CN931 /CN

31、932 on the audio board.Cut off the tie band.Disconnect the connector CN71(on the power supply board) and CN81(on the audio board) and remove the relay board.Disconnect the harness from the connector CN831 on the main board.Remove the three screws G and one screw H attaching the audio board.1.2.3.4.

32、5.6.Removing the speaker board (See Fig.11)Prior to performing the following procedure, remove the top cover and rear panel.Disconnect the harness from connector CN931/CN932 on the audio board.Disconnect the harmess from connector CN813 and CN814 on the main board.1.2.Fig.10Fig.11PowersupplyboardRel

33、ay board Audio boardSpeaker boardCN71CN81HCN814CN813CN931/CN932Power transformerGTie bandCN831Main boardFig.12DSP boardCN601Video boardS Video boardVideo audio boardFig.9Audio boardRX-8012PSL1-6Prior to performing the following procedure, remove the top cover and main board.Remove the two screws K a

34、ttaching the heat sink to the reverse side of main board.Disconnect the five connectors with each amp. board, and remove the main board.Remove the four screws K and ten screws L attaching the heat sink.1.2.3.Removing the heat sink (See Fig.14a, 14b and 15)Prior to performing the following procedure,

35、 remove the top cover.Remove the card wire and cut off the tie bands.Disconnect the harness from the connector CN721, CN723, CN813, CN814, CN831 and CN881 on the main board.Disconnect the harness from the connector CN722 on the center amp. board (see fig.5).Disconnect the harness from the connector

36、CN811 on the power trans1 board.Remove the screw H, after removing the relay board if needed (see fig.11).Remove the two screws I and the six screws J attaching the main board.1.2.3.4.6.7.Removing the main board (See Fig.13)Prior to performing the following procedures, remove the top cover and the r

37、ear panel.Cut off the tie band.Unsolder six solder parts on the voltage select board.1.2.Removing the voltage select board(See Fig.16)Fig.13Main board (reverse side)Main boardAmp. boardRear Rch amp. boardFront Lch amp. boardFront Rch amp. boardCenter amp. boardRear Lch amp. boardHeat sink Heat sink

38、KKLKFig.14bFig.14aFig.15Main boardCN881CN831CN814CN721CN706CN705CN702CN701CN703CN722CN723CN813IIHJJTie bandTie bandCard wireCN811Power transformerSolder partSolderpartTie bandVoltage select boardVoltage selectorFig.16KPowertrans1boardRX-8012PSL1-7Prior to performing the following procedure, remove t

39、he top cover and relay board.Cut off the tie band if needed.Disconnect the card wire from the connector CN402 on the power supply board.Disconnect the harness from the connector CN55/CN56 on the power trans1 board (see fig.17).Remove the three screws O attaching the power supply board and pull out t

40、he power supply board removing the hook.Unsolder three solder parts on the power supply board.1.2.3.4.5.Removing the power supply board (See Fig.18)Prior to performing the following procedure, remove the top cover and rear panel.Unsolder seven solder parts on the power/fuse board.Remove the screw N

41、attaching the power/fuse board.1.2.Removing the power/fuse board(See Fig.17)Prior to performing the following procedure, remove the top cover, front panel assembly and power supply board.Disconnect the harness form the connector CN881on the main board (see fig.13).Remove the nut fixing the headphone

42、 jack.Remove the screw P attaching the bracket and remove the bracket.Drawn out the headphone jack board in the direction of an inner side.1.2.3.4.Removing the headphone jack board(See Fig.18 and 19)Prior to performing the following procedures, remove the top cover.Disconnect the harness from the co

43、nnector CN55 /CN56 and CN811 on the power trans1 board.Unsolder seven solder parts on the power trans2 board .Remove the four screws M attaching the power transformer.1.2.3.Removing the power transformer(See Fig.17)Fig.18Fig.19NutBracketHeadphonejackHeadphone jackHeadphone jack boardTie bandP (fixin

44、g the earth wire formthe front panel assembly)Solder partHookTie bandOOOPower supply boardCN402Fig.17Powersupply boardCN55/CN56CN811Power transformerMSolder partMSolder partNPower/fuseboardPower cordPower trans1 boardPower trans2 boardRX-8012PSL1-8Prior to performing the following procedure, remove

45、the top cover and front panel assembly.Pull out the volume knob on the front side of the front panel and remove the nut attaching the system control board.Remove the two screws A attaching the power switch board on the front panel assembly(inner side).Remove the two screws B attaching the switch boa

46、rd on the front panel assembly(inner side).Remove the cords from the three hooks a.Remove the eight screws C attaching the system control board from the inner side of the front panel assembly.Release the four joints on the back of the front panel by pushing the joint tabs inward. Remove the operatio

47、n switch panel toward the front.Disconnect the harness from the connector CN420 and CN422 on the system control board.Release the two hooks b attaching the system 1.2.3.4.5.6.7.8.Removing the system control board, power switch board and switch board (See Fig.1 to 3)Matters that require attention dur

48、ing replacement of IC400In case where there is a resistance array:Both onetime IC and mask IC can be usedIn case where there is no resistance array:Only mask IC can be usedFig.1Fig.2Fig.3Front panel assemblyFront panel assembly(inner side)NutVolume knobSystem control boardPower switch boardCCCN422AJ

49、ointJointJointJointHook bHook bOperation switch panelBCN420Switch boardCHook aCordsResistance arrayRX-8012PSL1-9Adjustment method1.Set the volume control to minimum during this adjustment.(No signal & No load)2.Set the surround mode OFF.2.Turn VR787 and VR788 fully counterclockwise to warm up before

50、 adjustment. If the heat sink is already warm from previous use the correct adjustment can not be made.3.For L-ch,connect a DC voltmeter between B2204 and B2205 (Lch) And,connect it between B2213 and B2214(Rch).4.30 minutes later after power on, adjust VR787 for L-ch, or VR788 for R-ch so that the D