Jvc-RX-8012-Service-Manual电路原理图.pdf

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1、SERVICE MANUALAUDIO/VIDEO CONTROL RECEIVERNo.21002Jun. 2001COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD.RX-8012VSLRX-8010VBKRX-8012VSL/RX-8010VBKUJ U.S.MilitaryContentsSafety precautions -1-2Disassembly method -1-3Adjustment method -1-9Self-diagnose function -1-10Description of major ICs -1-1228DIGIT

2、ALUW Brazil,Mexico,PeruArea SuffixRX-8012VSLRX-8010VBKCONTROLDOWN UPEFFECT SETTINGDIGITALEQTV SOUND/DBSVIDEOVCR 2VCR 1DVDDVD MULTIMIDNIGHT MODEDSP MODES-VIDEO VIDEOVIDEOLAUDIORSURROUND ON/OFFSUBWOOFER OUT ON/OFFSPEAKERS ON/OFFFM/AM TUNING FM/AM PRESET FM MODEMEMORYPHONES1STANDBYUSB AUDIOPUSH OPENINP

3、UTANALOG/DIGITALINPUT ATTFM / AMUSB AUDIOTAPE / MDCDRCDPHONOLEVELADJUSTRX-8012V AUDIO/VIDEO CONTROL RECEIVERLINE DIRECTBASS BOOSTMASTER VOLUMEDIGITALSURROUND DIGITAL2SOUCE NAMESOUCE NAMESTANDBY/ONCONTROL231564897/P0 +1010LINE DIF.ECT BOOST EFFECTMENUENTERSIZEROOMBASSMODE TEST CTR TONE LIVENESSMIDNIG

4、HTSOUND SUBWFRDIGITAL EQ REAR L REAR RL/R BAL CENTERMUTINGCH/ LEVEL TV VOLPLAYSTOP/REWDOWN TUNING UPFF/EXITBAL LBAL RVOLUMECATV/DBSTV/VIDEOMENUTEXTRECDISPLAYPAUSEPAUSESETRETURN FM MODE 100+CONTROLA/V CONTROL RECEIVERCATV/DBS VCR 1 TV AUDIODSPMODE INPUTON/OFFDVD MUILTIDVDUSBCDCDRTAPE/MDTV/DBS VIDEO P

5、HONOFM/AMVCR 1 VCR 2SURROUND ANALOG/DIGITAL SLEEPRM-SRX8012U Model ColorRX-8012VSLRX-8010VBK BlackSilverRX-8012VSL/RX-8010VBK1-21. 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

6、 to the original design unless authorized in writing by the manufacturer. Replacement parts must be identical to those 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 alter

7、ations of the product should not be made. Any design alterations or additions will void the manufacturers warranty 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 specia

8、l safety-related characteristics. These characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristi

9、cs are identified in the Parts List of Service Manual. Electrical components having such features are identified by 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

10、 replacement parts shown in the Parts List of Service 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 from live parts, high temperature parts, moving parts and/or sharp edges for the

11、 prevention of electric shock and fire hazard. When service is required, the original lead routing and dress should be observed, and it should be confirmed that they have been returned to normal, after re-assembling.5. Leakage current check (Electrical shock hazard testing)After re-assembling the pr

12、oduct, always perform an isolation 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 product is safe to operate without danger of electrical shock.Do not use a line isolation transformer during

13、this check.Plug the AC line cord directly into the AC outlet. Using a “Leakage Current Tester“, measure the leakage current 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 no

14、t exceed 0.5mA AC (r.m.s.).Alternate check methodPlug the AC line cord directly into the AC outlet. Use an AC voltmeter 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 k

15、nown good earth ground.Measure the AC voltage across the resistor with the AC voltmeter. Move the resistor connection to each exposed metal part, particularly any exposed metal part having a return path to the chassis, and measure the AC voltage across the resistor. Now, reverse the plug in the AC o

16、utlet and repeat each measurement. Voltage measured any must not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5 mA 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 safet

17、y standards are maintained.3. Repairs must be made in accordance with the relevant safety standards.4. It is essential 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 ex

18、posedmetal part.AC VOLTMETER(Having 1000 ohms/volts,or more sensitivity)1500 10W0.15 F AC TYPE!Burrs formed during molding 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

19、 the silk-screen printed side (parts side) of the PWB diagrams, the parts that are printed over with black such as the resistor ( ), diode ( ) and ICP ( ) or identified by the “ “ mark nearby are critical for safety. When replacing them, be sure to use the parts of the same type and rating as specif

20、ied by the manufacturer. (Except the J&C version)http:/getMANUAL.comRX-8012VSL/RX-8010VBK1-3Remove the four screws A attaching the top cover on both sides of the body.Remove the three screws B on the back of the body.Remove the top cover from behind in the direction of the arrow while pulling both s

21、ides 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 the direction of the arrow.Remove the thirty four screws E attaching the each boards to the rear

22、panel on the back of the body.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.Disconnect the card wire from connector CN400 on the audio board and CN402 on the power

23、supply board in the front panel assembly.Cut off the tie band fixing the harness.Remove the three screws C attaching the front panel assembly.Remove the four screws D attaching the front panel assembly on the bottom of the body. Detach the front panel assembly toward the front.1.2.3.4.Removing the f

24、ront panel assembly (See Fig.2 to 3)Removing the voltage selector (See Fig.4)Prior to performing the following procedure, remove the top cover.Remove the power cord stopper from the rear panel by moving it in the direction of the arrow.Remove the two screws F attaching the rear panel on the back of

25、the body.1.2.Fig.1Fig.2Fig.3Fig.4A 2A 2BTop coverCPower supply boardAudio boardCN400MainboardTie bandDEFEFFCord stopperCFront panel assemblyFront panel assemblyDRear panelCN402EE EFRX-8012VSL/RX-8010VBK1-4Prior to performing the following procedure, remove the top cover and the rear panel.Cut off th

26、e tie band fixing the harness.Disconnect the connect CN501, CN243, CN205, CN381, CN361 on the DVD board.Disconnect the harness from connector CN721, CN722 and CN723.Disconnect the tuner board and audio input board from connector CN101 and CN301 on the audio board.Disconnect the video audio board and

27、 video board from connector CN303 and CN201 on the audio board.Disconnect the S video board from connector CN241 on the audio board.Disconnect the DSP board from connector CN601 on the audio board.Pull out the plastic pin which prevents from coming out.1.2.3.4.5.6.7.8.Removing each board connected t

28、o the rear side of the audio board(See Fig.5 to 11)Fig.5Fig.6Fig.8Tie bandCN101CN723CN361CN381CN243TunerboardCN501CN721 CN722CN205Fig.9CN303CN201 CN241Audio boardCN731CN732Fig.7DVD boardAudio inputboardVideo boardS Video boardVideo audioboardDSP boardCN301CN101Video boardS Video boardCN244Video audi

29、oboardCN206CN416Plastic pinRX-8012VSL/RX-8010VBK1-5Prior to performing the following procedure, remove the top cover and the tuner board, audio input board, video audio board, video board, S-video board, DVD board and the rear panel.Removing the audio board(See Fig.12 to 13)Disconnect the harness fr

30、om connector CN813 and CN814 on the main board.Disconnect the card wire from connector CN931 and CN932 on the audio board.Cut off the tie band fixing the harness.Disconnect the relay board from the audio board and the power supply board. (CN71,CN81)Disconnect the card wire from connector CN831 on th

31、e main board.Remove the three screws G attaching the audio board.Remove the screw H attaching the audio board .1.2.3.4.5.6.7.Fig.10Fig.11Powersupply boardPower / FuseboardRelay board Audio boardCN71CN81HCN814CN813CN931/ 932Power transformerGGTie bandCN831MainboardFig.12DSP boardCN601Video boardS Vid

32、eo boardVideo audioboardFig.13Voltage selectboardRX-8012VSL/RX-8010VBK1-6Remove the ten screws K and four screws L attaching the heat sink.Remove the two screws L attaching the heat sink from the rear side of main board.1.2.Removing the heat sink (See Fig.15 to 16)Prior to performing the following p

33、rocedure, remove the top cover, the rear panel and audio board.Cut off the tie band fixing the harness.Disconnect the harness from connector CN811 on the power supply board respectively.Disconnect the harness from connector CN881 on the main board.Remove the four screws I and the four screws J attac

34、hing the main board.1.2.3.4.Removing the main board (See Fig.14)Prior to performing the following procedures, remove the top cover and the rear panel.Cut off the tie band fixing the harness.Unsolder the six harnesses connected to the power transformer.1.2.Removing the voltage select board(See Fig.17

35、)Fig.14Main boardrear sideHeat sink LLK KKLFig.15Fig.16MainboardICN881IJJIITie bandCN811Power transformerSolder pointsSolderpointsTie bandPower cordVoltage select boardVoltage selectorFig.17LPowersupply boardRX-8012VSL/RX-8010VBK1-7Prior to performing the following procedure, remove the top cover an

36、d the front panel.Remove the screw O fixing a bonding ground.Remove the one nut attaching the headphone jack of the power supply board on the front side of the body.Remove the front panel assembly. and the screw a ground.Disconnect the card wire from connector CN402 on the power supply board.Remove

37、the three screws P attaching the power supply board and pull out the power supply board from the front bracket backward.Unsolder the three harnesses connected to the power supply board.1.2.3.4.5.6.Removing the power supply board (See Fig.19 to 21)Prior to performing the following procedure, remove t

38、he top cover and the rear panel.Remove the screw N attaching the power / fuse board.Unsolder the power cord and other harnesses connected to the power / fuse board.1.2.Removing the power / fuse board(See Fig.18)Prior to performing the following procedures, remove the top cover.Unsolder the two harne

39、sses connected to the power transformer.Disconnect the harness from connector CN55 and CN56 on the power transformer board.Remove the four screws M attaching the power transformer.1.2.3.Removing the power transformer(See Fig.18)Fig.19Fig.20Power supplyboardNutHeadphone jackHeadphone jackTie bandPPPS

40、olderHookTie bandOPower supplyboardCN402Fig.18Powersupply boardCN55 / 56Power transformerMSolder pointsMSolder pointsNPower / fuse boardPower cordPower transformerboardRX-8012VSL/RX-8010VBK1-8Prior to performing the following procedure, remove the top cover and the front panel assembly.Pull out the

41、volume knob on the front side of the front panel and remove the nut attaching the system control board.Remove the two screws Q attaching the power switch board.Remove the two screws R attaching the switch board.Remove the cords from the three hooks a.Remove the eight screws S attaching the system co

42、ntrol board on the back of the front panel.On the back of the front panel, release the four joints by pushing the joint tabs inward. Remove the operation switch panel toward the front.Disconnect the harness from connector CN420 and CN422 on the system control board.Release the two hooks b attaching

43、the system control board.1.2.3.4.5.6.7.8.Removing the system control board / power switch board (See Fig.21 to 23)Matters that require attention during 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

44、 mask IC can be usedFig.21Fig.22Fig.23Front panel assemblyNutMASTER VOLUME knobSystem control boardPower switchboardSSCN422QJointJoint JointJointHook bHook bOperation switch panelRCN420SwitchboardSHook aCordsResistance arrayRX-8012VSL/RX-8010VBK1-9Adjustment method1.Set the volume control to minimum

45、 during this adjustment.(No signal & No load)2.Set the surround mode OFF.2.Turn VR787 and VR788 fully counterclockwise to warm up before 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

46、)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 DC voltmeter value has 1mV10mV.1.Tuner rangeFM 87.5MHz108.0MHz AM(MW) 531kHz1710kHzTuner sectionPower amplifier sectionB2213, B2214VR787 (Lch)VR788 (Rch)Heat sinkAdjus

47、tment of idling currentMeasurement location B2204-B2205(Lch) , B2213-2214(Rch)Adjustment part VR787(Lch) , VR788(Rch)AttentionThis adjustment does not obtain a correct adjustment value immediately after the amplifier isused (state that an internal temperature has risen). Please adjust immediately af

48、ter using the amplifier after turning off the power supply of theamplifier and falling an internal temperature. * It is not abnormal though the idling current might not become 0mA even if it is finished to turn variableresistance (VR787,VR788) in the direction of counterclockwise. B2204, B2205RX-8012VSL/RX-8010VBK1-10Pin 2 Micro-computer+5VPin 3Digital+5VPin 4Analog+5VPin 5+12V Pin 7 Tuner+9VAt abnormal state(Low voltage) Analog value0 - 2.2V Analog value0 - 2.2V Analog value 0 - 2.2V Analog value