Kenwood-KRC-218-Service-Manual电路原理图.pdf
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1、CASSETTE RECEIVERKRC-208S/218SERVICE MANUAL 2000-1 PRINTED IN KOREAB51-7586-00 (K) 1787KRC-268/288KRC-28MRKRC-28MR (K)PLASTIC CABINET ASSY(A02-1486-13)LEVER(D10-3031-04) x2MOUNTING HARDWARE ASSY(J21-9491-03)DC CORD(E30-xxxx-xx)(Refer to the parts list.)CD/MD-CHANGER CONTROLKRC-208SCD/MD-CHANGER CONT
2、ROLKRC-28MRKRC-268KRC-208S (K)KRC-218 (K)KRC-268 (M)STAY(J54-0606-04)SCREW SET(N99-1610-15)(Except KRC-28MR)SCREW SET(N99-1632-05)KRC-218CD/MD-CHANGER CONTROLKRC-288KRC-288 (M)AUD123456CLKATTSRCPWROFFAMEADJAUTOSCANRDMREPT.C/D.SCNM.RDMLOUDDISCCRSCA.ADJFMAMFFREWPROGAUD123456CLKATTSRCPWROFFAMEADJAUTOSC
3、ANRDMREPT.C/D.SCNM.RDMLOUDDISCCRSCA.ADJFMAMFFREWPROGAUD123456CLKATTSRCPWROFFAMEADJAUTOT.CALLLOUDCRSCA.ADJFMAMFFREWPROGAUD123456CLKATTSRCPWROFFAMEADJAUTOT.CALLLOUDCRSCA.ADJFMAMFFREWPROGAUD123456CLKATTSRCPWROFFAMEADJAUTOSCANRDMREPT.C/D.SCNM.RDMLOUDDISCCRSCA.ADJFMAMFFREWPROG40%KRC-208S/218,268/288,28MR
4、2BLOCK DIAGRAMIC1KEYPANEL 5V SWMUTEB.U. DET. B.U.ACCP-CONT.MUTEPREPOWER ICEQ. AMP.CH ISO AMPNC/MPXE-VOL.CD/MDCHANGERFRONT LchFRONT RchREAR LchREAR RchJ2LCD DRIVERLCDME1MAINTAPE MECHA.IC51 Lch2 RchPRE OUTIC2IC4IC3SP OUTREARJ4RESET SWPAN IN SWANT-CONT.P-CONT.J2J5IC1FRONT-ENDJ1FM+BQ201AM+BQ203AM BPFFM
5、BPFC154,157,R206C153,156,R207Q320Q450,451Q370,371Q50Q350-353Q353P-CON.SWQ54-57COM+BQ58-61ILLUMI.B.U.5VQ51,52SYSTEM u-COMS1S2S3P-CONT.CHANGERRST SWQ301D1-15PL1,2ANT.ANT-CONT.FM ANTAM ANTRF GNDFM+BAM+BOSC GNDOSC GNDOSC GNDVTPLL +BIFC OUTSDASCLDIG GNDIF1+BIF1 GNDS-METERIF2 GNDSDFM+BSW5VACC DETB.U. DETS
6、CLMUTESDAP. CONPANELHOLDL CLKL DATASL DATALFWD/REVMOTORCH CONDATAHDATACREQ HREQ CCH CLKRchCOMLchTAPEMP INAMMPXOUT RROUT LROUT RFRchLEVELSCLSDAOUT LFRchSTBYMUTERchLchT-MUTEFWDREVB.U.5V8VB.U.CHRSTS MUTE8410B.U.5VAM+BVDD 5VPACK INL CEANT CONCHMUTEBEEPSVRAMP. STBYSVRAC GND (BEEP)Lch LchRchLch1200mVTAPE
7、:1681mVCD/MD-CH :3529mVAM :546mVFM :1781mV8VRF GNDOSC GNDIF2 +BAUDIO OUT8VS-METERSDPLL CLKPLL DATAM1HD1R55.6mVBU5VSW5V8VB.U.5VAM: 170mVFM: 400mVLPACK IN(FF/REW)AMP. MUTEFF/REWBU5VILL(X13)MKRC-208S/218,268/288,28MR (K/K,M/M,K)A13KRC-208S/218,268/288,28MRCOMPONENT DESCRIPTIONSYNTHESIZER UNIT (X14-614x
8、-xx)REF. No.FUNCTIONOPERATIONIC1SYSTEM -COMControls system.IC2ELECTRIC VOLUMEControls sound volume. Selects each source.IC3MUTEControls each mute output.IC4POWER ICAmplifies power so that the speaker can drive audio signal.IC5EQUALIZER AMPLIFIEREqualizer amplifier for cassette tape sound.Q50BACK-UP
9、DETECTIONStops when the back-up voltage comes less than 9.2V.Q51,52BACK-UP 5V AVRWorks when the back-up works.Q53P.ON DRIVERWorks when the power comes.Q54,55COM+B SWWorks when 5V comes.Q56,57COM+B AVRWorks when Q54 and Q55 work.Q58,59ILLUMINATION +B SWWorks when the base level of Q58 comes “H“.Q60,6
10、1ILLUMINATION +B AVRWorks when Q58 and Q59 work.Q150ELECTRIC VOLUME MUTE SWWorks when the base level comes “H“.Q151SVR DISCHARGE SWWorks when the base level comes “H“.Q153PRE MUTE DRIVERWorks when the base level comes “L“.Q200FM +B SWWorks when the base level comes “H“ in FM mode.Q201FM +B DRIVERWor
11、ks when Q200 works.Q202AM +B SWWorks when the base level comes “H“ in AM mode.Q203AM +B DRIVERWorks when Q203 works.Q260MOTOR +B SWWorks when the base level comes “H“ in the tape mode.Q261MOTOR +B DRIVERWorks when Q260 works.Q301CHANGER RESET SWWorks when the base level comes “L“.Q320PANEL 5V SWWork
12、s when the base level comes “L“.Q350P-CON. DRIVERWorks when Q353 works.Q351,352P-CON. PROTECTIONWorks when P-CON output voltage goes down.Q353P-CON. SWWorks when the base level comes “H“.Q370ANTENNA CONTROL DRIVERWorks when Q371 works.Q371ANTENNA CONTROL SWWorks when the base level comes “H“ in the
13、tuner mode.Q450,451PRE MUTE SWWorks when Q153 works.4KRC-208S/218,268/288,28MRCIRCUIT DESCRIPTION(X14-) IC1 : -COMPORT No.PORT NAMEI/OFUNCTIONOPERATING CONDITION1XINI-com clock. (4.5MHz)-2GND-GND.-3L DATA LILCD driver data.-4L DATA SOLCD driver data.-5L CLKOLCD driver clock.-6LCEOLCD driver chip ena
14、ble.-7SDAI/OE-volume data.-8PLL DATAI/OTuner data.-9PLL CLKOTuner clock.-10SDITuner signal detection.“H“ : Tuner signal exists.“L“ : Tuner signal does not exist.11DATA CIChanger data.-12DATA HOHead unit data.-13CH CLKI/OChanger clock.-14-No connection.-15MOTOROMechanism motor.-16SCLOE-volume clock.-
15、17-24-No connection.-25AM+BOAM power supply.-26FM+BOFM power supply.-27PACK INICassette tape pack-in.“L“ : Pack in. “H“ : Ejection.28FF/REWIFF/REW signal.“L“ : FF/REW. “H“ : Play.29,30GND-GND.-31VDD-VDD.-32REQ CIRequest from changer.-33MUTEOMute.-34CH CONOChanger control.-35REQ HORequest to head uni
16、t.-36SVROPower IC (IC4) discharge control.-37AMP STBYOPower IC (IC4) stand-by.-38AMP MUTEOPower IC (IC4) mute.-39P CONOP.CON for external amplifier.-40ANT. CONOPower antenna.-41SW5OCircumambient circuit power supply control.-42ILLOIllumination.-43-No connection.-44BEEPOBuzzer. (2KHz)-45-47-No connec
17、tion.-48ROLL OFFIDestination switch.-49N.CANIDestination switch.-50SEL1IDestination switch.-51SEL2IDestination switch.-52-No connection.-53EQ MUTEOTape equalizer mute.-54FWD/REVIFWD/REV.-55-No connection.-56REMOIRemote control.-57-60-No connection.-61ACC DETIACC detection.-62BU DETIBack-up detection
18、.-63S METERITuner signal meter.-64PANELIPanel on/off.“L“ : Panel on. “H“ : Panel off.65,66GND-GND.-67HOLDIClock stop.-68VDD-VDD.-69,70GND-GND.-71,72-No connection.-73VDD-VDD.-74,75GND-GND.-76VSS-GND.-77,78-No connection.-79GND-GND.-80XOUTO-com clock. (4.5MHz)-5TEST MODEKRC-208S/218,268/288,28MR1. Ho
19、w to enter the test modeReset the unit while holding the “FM“ key and preset “6“ key.All indication segments go ON at the beginning of the test mode.2. How to release the test modeSimply reset the unit.(NOTE) The test mode is not canceled by ACC OFF, power OFF, momentary powerdown or the panel off.3
20、. Audio adjustmentSet the volume level to -10dB (which is shown as “30“ on the display).Loudness OFF.The BASS/TREBLE and BALANCE/FADER can be set to the full-boost/full-cut and full-front/full-rear each by pressing the “Track UP“ / “Track DOWN“ keys.Sound coordination doesnt appear for the feed.6KRC
21、-208S/218,268/288,28MRADJUSTMENT/EINSTELLUNGEN (MECHA.)Einstellung des KopfwinkelsVorgehensweise bei der Kopfhhen-Einstellung Whrend des Bandlaufs in Vorwrtsrichtung die Schrauben Fund F soeinstellen, da die Linie A eines 2-Linien-Bands (2-LINE TAPE) durchdie Mitte der Kopfabschirmplatte (Zentrum de
22、s Mittelbereichs) verluft. Whrend des Bandlaufs in Rckwrtsrichtung die Schrauben Rund Rso einstellen, da die Linie B eines 2-Linien-Bands (2-LINE TAPE)durch die Mitte der Kopfabschirmplatte (Zentrum des Mittelbereichs)verluft. Nachdem die obige Einstellung abgschlossen ist, die Bandlaufrichtungumkeh
23、ren und die Ausrichtung in Vorwrtsrichtung noch einmalberprfen. Wenn eine Abweichung festgestellt wird, ist dieseEinstellung zu wiederholen. (Verwendetes Band: SCC-1659, hergestelltvon A-BEX)Head Angle AdjustmentHead height alignment procedure During FWD transport adjust screws Fand F so that line A
24、 of 2-LINETAPE passes trough the center of the head shield plate (core centerarea) During RVS transport adjust screws Rand R so that line B of 2-LINETAPE passes trough the center of the head shield plate core (centerarea) After the alignment above, reverse the transport direction and check theFWD al
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