Kenwood-KRC-279-RA-Service-Manual电路原理图.pdf

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1、CASSETTE RECEIVERKRC-15RGSERVICE MANUAL 2000-10 PRINTED IN KOREAB51-7684-00 (K) 2161KRC-179RA/RG/RYA/RYGKRC-25RA/RGANTENNAADAPTOR(T90-0523-05)(Except KRC-281RG)KRC-279RA/RG/RYA/RYGKRC-281RGKRC-279RCD/MD-CHANGER CONTROLKRC-25RCD/MD-CHANGER CONTROLKRC-15RKRC-179RKRC-281RCD/MD-CHANGER CONTROLKRC-15RG (

2、E)KRC-179RA/RG/RYA/RYG (E)KRC-25RA/RG (E)PLASTIC CABINETASSY(A02-1486-13)LEVER(D10-3031-04) x2MOUNTING HARDWARE ASSY(J21-9491-13)DC CORD(E30-xxxx-xx)(Refer to the parts list.)STAY(J54-0606-04)SCREW SET(N99-1610-15)(KRC-281RG only)SCREW SET(N99-1632-05)(KRC-281RG only)AUD123456CLKATTSRCPWROFFSCANRDMR

3、EPT.C/D.SCNM.RDMLOUDDISCHIGH POWER 40Wx40Wx4MENUFMAMFFREWPROGVOL ADJNAME SETTIPTYAUD123456CLKATTSRCPWROFFSCANRDMREPT.C/D.SCNM.RDMLOUDDISCHIGH POWER 40Wx40Wx4MENUFMAMFFREWPROGVOL ADJNAME SETTIPTYAUD123456CLKATTSRCPWROFFSCANRDMREPT.C/D.SCNM.RDMLOUDDISCHIGH POWER 40Wx40Wx4MENUFMAMFFREWPROGVOL ADJNAME S

4、ETTIPTYAUD123456CLKATTSRCPWROFFT.CALLLOUDHIGH POWER 40Wx40Wx4MENUFMAMFFREWPROGVOL ADJTIPTYAUD123456CLKATTSRCPWROFFT.C/ALLLOUDHIGH POWER 40Wx40Wx4MENUFMAMFFREWPROGVOL ADJTIPTYKRC-279RA/RG/RYA/RYG (E)KRC-281RG (M)(KRC-281RG only)40%KRC-15R,179R,25R,279R,281R2CONTENTS / BLOCK DIAGRAMCONTENTS / BLOCK DI

5、AGRAM.2COMPONENT DESCRIPTION.3MICROCOMPUTERS TERMINAL DESCRIPTION.4TEST MODE.6ADJUSTMENT.7PARTS DESCRIPTIONS.8PC BOARD.9SCHEMATIC DIAGRAM.13EXPLODED VIEW.18PARTS LIST.21SPECIFICATIONS.Back coverCONTENTSBLOCK DIAGRAMIC1KEYP AN 5VMUTEB.U. DET . B.U.ACCP-CONT .MUTEPREPOWER ICEQ. AMP .CH ISO AMPNC/MPX/E

6、-VOL.CD/MDCHANGERFRONT LchFRONT RchREAR LchREAR RchJ2LCD DRIVERLCDME1MAINCASSETTE MECHA.IC51 Lch2 RchPRE OUTIC2IC4IC3SP OUTREARJ4P AN IN SWACC DET .P-CONT .J2J5IC1FRONT -ENDJ1FM+BQ201AM+BQ203AM BPFFM BPFC154,R206C153,R207Q320Q450,451Q49Q50Q350,351,370Q53SW 5VQ54-578VQ58-61ILLUMI.B.U. 5VQ51,52SYSTEM

7、u-COMS1S2S3RST SWQ301D1-15PL1,2ANT .TEL MUTEDECODERRDSIC7Q501,502MP SW40WRST ICRSTIC6ED1FM ANTAM ANTRF GNDFM+BAM+BOSC GNDOSC GNDOSC GNDVTPLL +BIFC OUTSDASCLDIG GNDIF1+BIF1 GNDS-METERIF2 GNDSDFM+BP .ONACC DETB.U. DETSCLMUTESDAP CONPANELRESETLCLKLDATASLDATALFWD/REVMOTORCH CONDATAHDATACREQ HREQ CCH CLK

8、RchCOMLchMP INAMMPXOUT RROUT LROUT RFRchLEVELSCLSDAOUT LFRchSTBYMUTERchLchT -MUTEFWDREVB.U.5V8VB.U.CH RSTS MUTE8510B.U.5VAM+BVDD 5VPACK INLRESPHONECH MUTEBEEPSVRAMP . STBYSVRAC GND (BEEP)Lch LchRchLch1200mVT APE :1681mVCD/MD-CH :3529mVAM :772mVFM :1339mV8VRF GNDOSC GNDIF2 +BAUDIO OUT8VS-METERSDPLL-S

9、CLPLL-SDAM1HD1L/R55.6mVB.U.5VSW5V8VB.U.5VAM: 170mVFM: 213mVT APEP ACK IN(FF/REW)AMP . MUTEFF/REWB.U.5VR QUALR CLKR DA T ASW5VMP OUTQUALAFCNOISEB.U.5VILLUMI.L CE(X13)MKRC-15R,179R,25R,279R,281R (E,M)A1TEL DETD3805VR2053KRC-15R,179R,25R,279R,281RCOMPONENT DESCRIPTIONREF No.FUNCTIONOPERATIONIC1SYSTEM -

10、COMControls the unit.IC2E-VOLUMEControls the volume and selects source.IC3MUTE LOGICControls the mute output.IC4POWER AMPLIFIERFor the speaker output.IC5EQUALIZER AMPLIFIERFor the cassette tapes signal.IC6RESETResets the power.IC7RDS DECODERDecodes the radio data.Q49ACC DETECTION SWOutputs “H“ durin

11、g the ACC off.Q50BACK-UP DETECTION SWOutputs “H“ when the back-up voltage is under 9.2V.Q51,52BACK-UP 5V DRIVERWorks when back-up current exists.Q53P.ON 5V SWWorks during the power on.Q54,558V SWWorks during the power on.Q56,578V DRIVERWorks during the power on.Q58,59ILLUMI +B SWWorks during the pow

12、er on.Q60,61ILLUMI +B DRIVERWorks during the power on.Q150E-VOL MUTE SWWorks when the back-up current is detected or the changer mute works or system -com mute works.Q151SVR FORCED DISCHARGE SWWorks when the amplifier mute works.Q153PRE OUT MUTE SWWorks when the back-up current is detected or the ch

13、anger mute works or system -com mute works.Q201FM +B SWWorks during FM mode.Q203AM +B SWWorks during AM mode.Q260MOTOR +B SWWorks during the tape mode.Q261MOTOR +B DRIVERWorks when Q206 works.Q301CD-CH RESET SWWorks when the power is reset and the reset SW works.Q320PANEL 5V SWWorks when the back-up

14、 current exists and the panel is attached on the unit.Q350P.CON DRIVER SWDoes not work during the power off and the ALL OFF.Q351P.CON PROTECTION SWWorks when the P.CON is short-circuited on the GND.Q352P.CON PROTECTION INHIBIT SWInhibits the protection SW in a moment during the P.CON on.Q353P.CON DR

15、IVER SWDoes not work during the power off and the ALL OFF.Q450,451PRE OUT MUTE SWWorks when the back-up current is detected or the changer mute works or system -com mute works.Q500AUDIO OUTPUT BUFFERFor RDS decoder.Q501,502AFC TIME CONSTANT SWWorks during receiving FM signal.Q503NOISE BUFFERFor nois

16、e level detection.SYNTHESIZER UNIT (X14-656x-xx)KRC-15R,179R,25R,279R,281R4MICROCOMPUTERS TERMINAL DESCRIPTIONPORT No.PORT NAMEI/OFUNCTIONOPERATING CONDITION1PANELIPanel detection.“L“ : Panel exists.2LCEOLCD driver chip enable.-3LRESOLCD driver reset.-4AVSS-GND.-5RDATAIRDS data.-6RQUALIRDS receiving

17、.-7AVREF 1-Reference voltage.-8IC2 SEL 1ISelector.“L“ : Normally.9IC2 SEL 0ISelector.“L“ : Normally.10-11L DATA LILCD driver communication data.-12L DATA SOLCD driver communication data.-13L CLKOLCD driver communication clock.-14,15-16DATA CIChanger communication data.-17DATA HOChanger communication

18、 data.-18CH CLKIChanger communication clock.-19-26-27MOTOROCassette tape motor SW.-28FF/REWICassette tape FF/REW detection.“L“ : FF or REW works.29-31-32SDISignal detection.“H“ : Signal exists.“L“ : Signal does not exist.33VSS 1-GND.-34-35PLL CLKOFront-end communication clock.-36PLL DATA I/OFront-en

19、d communication data.-37AM +BOAM power supply SW.-38FM +BOFM power supply SW.-39IC2 DATAI/OE-volume communication data.-40IC2 CLKOE-volume communication clock.-(X14-) IC1 : -COMKRC-15R,179R,25R,279R,281R5MICROCOMPUTERS TERMINAL DESCRIPTIONPORT No.PORT NAMEI/OFUNCTIONOPERATING CONDITION41AFCOFM noise

20、 detection / Time constant SW.-42MUTEOMute control.-43AMP MUTEOPower amplifier mute.-44-45CH CNTOChanger control.-46REQ HOChanger request.-47-48SVROSVR control.-49AMP STBYOPower amplifier stand-by.-50BEEPOBuzzer signal output.-51,52-53P.CONTOPower control SW.-54ACC DETIACC detection.-55B.U. DETIBack

21、-up detection.-56P.ONOPower SW.-57ILLUMIOIllumination SW.-58FWD/REVICassette mechanism FWD/REV detection.-59-60RESETISystem reset signal input.-61SEL 1IDestination SW.-62R CLKIRDS clock.-63REQ CIChanger request.-64PACK INICassette tape pack-in detection.-65KEY-REQIKey signal input detection.-66SEL 0

22、IDestination SW.-67VSS 0-GND.-68VDD 1-5V power supply.-69X2-Main system clock.-70X1IMain system clock.-71IC-GND.-72-73XT1-5V power supply.-74VDD 0-5V power supply.-75AVREF 0IA/D converter reference voltage.-76S METERIS-meter detection.“H“ : S-meter exists.“L“ : S-meter does not exist.77PHONEI-Naviga

23、tion mute : 2.5V or more. Telephone mute : 1V or less.78NOISEIFM noise detection.-79AV CONTOA/D converter reference voltage.-80-(X14-) IC1 : -COM6KRC-15R,179R,25R,279R,281RTEST MODE1. How to enter the test mode Reset the unit while holding the “FM“ key and preset “6“ key. All indication segments go

24、ON at the beginning of the test mode.2. How to release the test mode Simply reset the unit. (NOTE) The test mode is not canceled by ACC OFF, power OFF, momentary powerdown or the panel off.3. Audio adjustment Set the volume level to -10dB (which is shown as “30“ on the display). Loudness OFF. The BA

25、SS/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.7KRC-15R,179R,25R,279R,281REinstellung des KopfwinkelsVorgehensweise bei der Kopfhhen-Einstellung Whrend des B

26、andlaufs in Vorwrtsrichtung die Schrauben Fund F soeinstellen, da die Linie A eines 2-Linien-Bands (2-LINE TAPE) durchdie Mitte der Kopfabschirmplatte (Zentrum des Mittelbereichs) verluft. Whrend des Bandlaufs in Rckwrtsrichtung die Schrauben Rund Rso einstellen, da die Linie B eines 2-Linien-Bands

27、(2-LINE TAPE)durch die Mitte der Kopfabschirmplatte (Zentrum des Mittelbereichs)verluft. Nachdem die obige Einstellung abgschlossen ist, die Bandlaufrichtungumkehren und die Ausrichtung in Vorwrtsrichtung noch einmalberprfen. Wenn eine Abweichung festgestellt wird, ist dieseEinstellung zu wiederhole

28、n. (Verwendetes Band: SCC-1659, hergestelltvon A-BEX)Head Angle AdjustmentHead height alignment procedure During FWD transport adjust screws FandF so that line A 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

29、 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 alignment again. If it is deviated, perform alignment again. (Tapeused : SCC-1659, manufactured by A-BEX)(2-LINE TAPE)BABA(FWD)(RVS)HEIGHT(FW

30、D)HEIGHT/AZIMUTH(FWD)HEIGHT/AZIMUTH(RVS)TAPE SPEEDHEIGHT(RVS)FFRRADJUSTMENT8KRC-15R,179R,25R,279R,281RPARTS DESCRIPTIONSACEGIBDFHJ2 1357 46Refer to the schematic diagram for the value of resistors and capacitors. PC BOARD (Component side view)910C5C1C2C3 C4R2R3R4R5R6R7R8R9R21R10R1 1R12R13R14R15R17 R

31、1812441 64254080651211 12BEQ1IC1D17J1D15D1D2D3 D4D5D6D7D8 D9D10D11D12D13D14ED1X13-964x-xx (J74-0962-32) SWITCH UNITPL1 PL21 54 FMAMAUDRST654321CLKTISRCVOLAT TW170C251R156R15W158R14R62W159R57R59W157R60C52C163R161R159R162R16R13W174R381C380R61R251R151C214R503R125R123C13C14R58R52R54R106R112C164R352C154C

32、153C351TH1R504R155R154R153R322R401R400R380R408R409R407R406R412R410R41 1R303R302R304R306R305R403R301R402C504C54C502C505R63R64W162C501R1C1R201R203R150W153C452C202C204R455R453R454R451R450R452R205R141R2C2C5R382C6C157R111R113R404R103R108C151C156C155R160R206R207C158C506R8C8R4R6R7C7R5R133R323R1 10R158C101C

33、102R105C103W161W160R48R320R321R140W173W154R124R122 R152R121R117R157R405R143R104W169W168W167R3 R250W165R49R413W156R142W166W164R101R102C104W16313 45BE17148152811480120 214041606118 916BEEBBEEBBEBEBEEBBEEBBEBEEBBEEBEBEBEBEBBEEBEBBEEBQ61IC1Q52Q59Q58Q57Q153Q151Q150Q55Q49Q54Q53Q50Q500Q502Q501Q353Q301Q320Q

34、352Q351IC6IC7Q451Q450Q260IC2Q503IC34.3320MHzW24W64W76W78R200R202W36R55W73W69W12W99R67W58W104C4R350R370W67W57W70C209L10W66W68W4W6W72W71W7W85W80W39W42W45W48W50W101W102W2W200R51R65R351R353R66X1C50C17C18C160C152C55W15C15C16C161C350C352C503C162C500C450C451C150C159C56C58C53C57W97W98W103W53W43W51W28W10X2W1

35、7R501W3R502R500R261L5R260L4C402C400C401W54W47W95W93W89R1 19W13W61W62W14C9 C250C10W8W9W33W23W27W30W32W37W26W55W56R263R262W22W77W63W65W21R252W105W52W100W94W96W92W91 W90W87W59W60W20W25W29W31W35W19W1 1W82W79W83W40W38W41W84W81C3W34W18W49W46W44R120W88W74W754.19MHzTP5VDGPDAPCK2DACCKTHTC2CKL1RESL8 L7R100L12

36、L6L3W5R107LR124EBBE21242516981EBBEEBEB151861111221BEA1Q60Q56D370D410D50D405D371D352Q51Q350D380D401D400D56D52D51D55D54D402D408D409D403D350D351D53Q261Q201Q203D404D200D260P1IC5D261J1J5J4J2J3IC4D150D152D151WH1D100CN1X14-656x-xx (J74-1189-12)SYNTHESIZER UNITKLNPRTMOQS2 1357 46Refer to the schematic diagr

37、am for the value of resistors and capacitors.PC BOARD (Foilside view)1211R141C13C163 R152R140R504C50181916R203EC504C214C502C505W173BER207BEBW154R503R121R206R143ER112BR113R1 10R108W156R142 R111R405C155R205C506C158BR15014 15C156C153C154EC1571R160R123C15128EBR161ER452C202C204R454BR201BER450R451W153R410

38、R401R400R409R412R41 1R402R455EBR453C452R407R408R406R403W174R13R16W157W169R320R306R303R322R301R302R305R304R323W162R321EBEBEBR381R1624140R1051R1068020 21 R1176061W164W165W166C102C103C101W168W167R103W16331R404R1044BE5R101R102C104R124R122C14W161R125W1601481C1647R413R133R382R49C380R48C8R8C6C2R250C5R5 C7R

39、3R7C1R1BR4R6R2C251R60R59BEBEBER251 EER352R157R158R159EBC351R156R154BER151R155R380R57C52EBBR54R58C54R52R153W158W159ER62R61BEW170EBR63ER64BBTH1R15R14IC7Q502Q500Q260Q501Q503Q150IC2Q450Q451Q153Q320Q52Q352IC6IC1Q301IC3Q50Q49Q59Q53Q58Q351Q151Q353Q55Q54Q57Q61C17W52W50W21R261C5006R260EBL3W47L8 L74.3320MHzC5

40、03X2L1224C2092CK2DAW44W19R262R501R502R500 R263W1 1W5W9 W8L10W7W18W35W25W20W31W29W22W41R107W34W21THTCW46PCKPDAW4R1 19W6R120 R202BR200C152W33W26W38W40W49W27W23W32W30C150W37L6L4W200 L51C450C451EB EW14W17W15W12W3C16C15C18W42W39W48W45W13C402C401C400RLW10W24W36C15921122111W82W77W88W84W104R100RES4.19MHzX1C

41、CKTPW75 W745VW81 DGW64W65W59W60W67W68W62W61W63W79W87W89W83W90W91C352C55C3C9 C250W93 W 9685W94W92W95C101C4C56W1051W55W57 W56R353W54W58C350R351R51BER55R350R370C53C162C160C161W70W71W692524W78W72W80W85W76W73C508W101R67BEW99R252W100W98W97C58C57W102EBR66R651BEW28W43W53W51W66169W103L1X14-656x-xx (J74-1189-

42、12)SYNTHESIZER UNITJ5Q261WH1P1D261D260D200Q203A1J1D403Q201D404D405D410D400 D401D402D409D408J3D100D352CN1IC5D151D152D150D371D51D380D52D54D351Q350D370D350IC4D53Q51D55D56Q60D50Q56J4J2R10R15C52540R11644124 1E65BC1C2C3 C4R7 R9R4R21 R880 R6R5R312R2211 1R17R12R13R18R14IC1Q1J1D17X13-964x-xx (J74-0962-32) SWITCH UNITD14D15ED1D2D1D3 D4D5D8D9D6D7D11D10D13D12VOLSRCTI CLKPL1ATT11 2 3 4 5AUD546RSTPL2FMAM