Kenwood-KRC-278-RG-Service-Manual电路原理图.pdf

《Kenwood-KRC-278-RG-Service-Manual电路原理图.pdf》由会员分享，可在线阅读，更多相关《Kenwood-KRC-278-RG-Service-Manual电路原理图.pdf（21页珍藏版）》请在收音机爱好者资料库上搜索。

1、CASSETTE RECEIVERKRC-13RGSERVICE MANUAL 2000-1 PRINTED IN KOREAB51-7587-00 (K) 2204KRC-178RA/RG/RYA/RYGKRC-23RA/RGANTENNA ADAPTOR(T90-0523-05)(Except KRC-280RG)KRC-278RA/RG/RYA/RYGKRC-280RGKRC-278RCD/MD-CHANGER CONTROLKRC-23RCD/MD-CHANGER CONTROLKRC-13RKRC-178RKRC-280RCD/MD-CHANGER CONTROLKRC-13RG (

2、E)KRC-178RA/RG/RYA/RYG (E)KRC-23RA/RG (E)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.)STAY(J54-0606-04)SCREW SET(N99-1610-15)(KRC-280RG only)SCREW SET(N99-1632-05)(KRC-280RG only)AUD123456CLKATTSRCPWROFFSCANRDM

3、REPT.C/D.SCNM.RDMLOUDDISCMENUFMAMFFREWPROGVOL ADJNAME SETTIPTYAUD123456CLKATTSRCPWROFFSCANRDMREPT.C/D.SCNM.RDMLOUDDISCMENUFMAMFFREWPROGVOL ADJNAME SETTIPTYAUD123456CLKATTSRCPWROFFSCANRDMREPT.C/D.SCNM.RDMLOUDDISCMENUFMAMFFREWPROGVOL ADJNAME SETTIPTYAUD123456CLKATTSRCPWROFFT.CALLLOUDMENUFMAMFFREWPROGV

4、OL ADJTIPTYAUD123456CLKATTSRCPWROFFT.C/ALLLOUDMENUFMAMFFREWPROGVOL ADJTIPTYKRC-278RA/RG/RYA/RYG (E)KRC-280RG (M)(KRC-280RG only)40%KRC-13R,178R,23R,278R,280R2BLOCK DIAGRAMIC1KEYPANEL 5V SWMUTEB.U. DET. B.U.ACCP-CONT.MUTEPREPOWER ICEQ. AMP.CH ISO AMPNC/MPX/E-VOL.CD/MDCHANGERFRONT LchFRONT RchREAR Lch

5、REAR RchJ2LCD DRIVERLCDME1MAINTAPE MECHA.IC51 Lch2 RchPRE OUTIC2IC4IC3SP OUTREARJ4RESET SWPAN IN SWACC DET.P-CONT.J2J5IC1FRONT-ENDJ1FM+BQ201AM+BQ203AM BPFFM BPFC154,157,R206C153,156,R207Q320Q450,451Q49Q50Q350-353Q353P-CON.SWQ54-578VQ58-61ILLUMI.B.U.5VQ51,52SYSTEM u-COMS1S2S3P-CONT.CD-CHRST SWQ301D1-

6、15PL1,2ANT.TEL MUTEDECODERRDSIC7Q501,502MP SW40WRESETIC6ED1FM ANTAM ANTRF GNDFM+BAM+BOSC GNDOSC GNDOSC GNDVTPLL +BIFC OUTSDASCLDIG GNDIF1+BIF1 GNDS-METERIF2 GNDSDFM+BP. O NACC DETB.U. DETSCLMUTESDAP. CONPANELRESETL CLKLDATASLDATALFWD/REVMOTORCH CONDATAHDATACREQ HREQ CCH CLKRchCOMLchTAPEMP INAMMPXOUT

7、 RROUT LROUT RFRchLEVELSCLSDAOUT LFRchSTBYMUTERchLchT-MUTEFWDREVBU5V8VB.U.CHRSTS MUTE8510B.U.5VAM+BVDD 5VPACK INL RESPHONECHMUTEBEEPSVRAMP. STBYSVRAC GND (BEEP)Lch LchRchLch1200mVTAPE :1681mVCD/MD-CH :3529mVAM :772mVFM :1339mV8VRF GNDOSC GNDIF2 +BAUDIO OUT8VS-METERSDPLL-SCLPLL-SDAM1HD1R55.6mVBU5VSW5

8、V8VB.U.5VAM: 170mVFM: 213mVLPACK IN(FF/REW)AMP. MUTEFF/REWBU5VR QUALR CLKR DATASW5VMP OUTQUALAFCNOISEBU5VILLL CE(X13)MKRC-13R,178R,23R,278R,280R (E,E,E,E,M)A1SYNTHESIZER UNIT (X14-613x-xx)REF. No.FUNCTIONOPERATIONIC1SYSTEM -COMControls system.IC2ELECTRIC VOLUMEControls sound volume. Selects each sou

9、rce.IC3MUTEControls each mute output.IC4POWER ICAmplifies power so that the speaker can drive audio signal.IC5EQUALIZER AMPLIFIEREqualizer amplifier for cassette tape sound.IC6RESETResets power supply.IC7RDS DECODERDecodes RDS signal.Q49ACC DETECTION SWWorks when ACC operation stops.Q50BACK-UP DETEC

10、TION SWWorks when the back-up voltage comes less than 9.2V.Q51,52BACK-UP 5V DRIVERWorks when the back-up works.Q53P.ON 5V SWWorks when the power comes.Q54,558V SWWorks when the power comes.Q56,578V DRIVERWorks when the power comes.Q58,59ILLUMINATION +B SWWorks when the power comes.Q60,61ILLUMINATION

11、 +B DRIVERWorks when the power comes.Q150ELECTRIC VOLUME MUTE SWWorks when the back-up voltage detection or the changer mute or-com mute works.Q151SVR FORCED DISCHARGE SWWorks when the amplifier mute works.Q153PRE OUT MUTE SWWorks when the back-up voltage detection or the changer mute or-com mute wo

12、rks.Q201FM +B SWWorks when FM mode is being selected.Q203AM +B SWWorks when AM mode is being selected.Q260MOTOR +B SWWorks when TAPE mode is being selected.Q261MOTOR +B DRIVERWorks when Q260 works.Q301CHANGER RESET SWWorks when power supply is being reset and IC6 works.Q320PANEL 5V SWWorks when the

13、back-up works and panel is on the unit.Q350P-CON. DRIVERStops during POWER OFF and ALL OFF modes.Q351P-CON. PROTECTION SWWorks when P-CON is being short-circuited on GND.Q352P-CON. PROTECTION INHIBIT SWInhibits protection SW function when P-CON works momentary.Q353P-CON. SWStops during POWER OFF and

14、 ALL OFF modes.Q450,451PRE OUT MUTE SWWorks when the back-up voltage detection or the changer mute or-com mute works.Q500AUDIO OUT BUFFERFor RDS decorder (IC7).Q501,502AFC TIME CONSTANT SWWorks when receiving FM signal. Stops when seeking FM signal.Q503NOISE BUFFERFor noise level detection.KRC-13R,1

15、78R,23R,278R,280R3COMPONENT DESCRIPTIONKRC-13R,178R,23R,278R,280R4CIRCUIT DESCRIPTION(X14-) IC1 : -COMPORT No.PORT NAMEI/OFUNCTIONOPERATING CONDITION1PANELIPanel on/off detection.“L“ : Panel on. “H“ : Panel off.2LCEOLCD driver chip enable.-3L RESOLCD driver reset.-4AVSS-GND.-5R DATAIRDS data.-6RQUAL

16、IRDS signal.-7AVREF 1IReference voltage.-8IC2 SEL 1ITo GND.-9IC2 SEL 0ITo GND.-10-No connection.-11L DATA LILCD driver data.-12L DATA SOLCD driver data.-13L CLKOLCD driver clock.-14,15-No connection.-16DATA CIChanger data.-17DATA HOChanger data.-18CH CLKIChanger clock.-19-26-No connection.-27MOTOROC

17、assette motor on/off.-28FF/REWIFF/REW.-29-31-No connection.-32SDITuner signal detection.“H“ : Tuner signal exists.“L“ : Tuner signal does not exist.33VSS 1-GND.-34-No connection.-35PLL CLKOPLL clock.-36PLL DATAI/OPLL data.-37AM+BOAM power supply.-38FM+BOFM power supply.-39IC2 DATAI/OE-volume data.-4

18、0IC2 CLKOE-volume clock.-41AFCOFM noise detection time constant switch.-42MUTEOMute control.-43AMP MUTEOPower IC (IC4) mute.-44-No connection.-45CH CONOChanger control.-46REC HORequest to head unit.-47-No connection.-48SVROPower IC (IC4) discharge control.-49AMP STBYOPower IC (IC4) stand-by.-50BEEPO

19、Buzzer.-51,52-No connection.-53P.CONTOPower control on/off.-54ACC DETIACC detection.-55B.U. DETIBack-up detection.-56P.ONOPower on/pff.-57ILLOIllumination on/off.-58FWD/REVIFWD/REV detection.-59-No connection.-60RESETISystem reset.-61SEL 1IDestination switch.-62R CLKIRDS clock.-63REQ CIRequest from

20、changer.-64PACK INICassette tape Pack-in detection.65KEY-REQIKey detection.- -66SEL 0IDestination switch.-67VSS 0-GND.-68VDD 1-VDD.-69X2-Main system clock.-70X1-Main system clock.-71IC-GND.-72XT2-No connection.-73XT1-VDD.-74VDD 0-VDD.-75AVREF 0IReference voltage.-76S METERISignal meter.-77PHONEITel/

21、Navi mute.Tel mute : Less than 1V.Navi mute : More than 2.5V.78NOISEIFM noise detection.-79AV CONTOA/D refernce voltage control.-80-No connection.-TEST MODE1. How 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

22、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. Audio adjustmentSet the volume level to -10dB (which is shown as “30“ on the display).Loudness OFF.The BASS/TREBLE and BALANCE/FADER can

23、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.5KRC-13R,178R,23R,278R,280RADJUSTMENT/EINSTELLUNGEN (MECHA.)Einstellung des KopfwinkelsVorgehensweise bei der Kopfhhen-Einstellung Whrend des B

24、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

25、(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

26、n. (Verwendetes Band: SCC-1659, hergestelltvon A-BEX)Head Angle AdjustmentHead height alignment procedure During FWD transport adjust screws Fand F 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

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

28、WD)HEIGHT/AZIMUTH(FWD)HEIGHT/AZIMUTH(RVS)TAPE SPEEDHEIGHT(RVS)FFRR6KRC-13R,178R,23R,278R,280RABDFHJCEGI2 1357 46Refer to the schematic diagram for the value of resistors and capacitors.PC BOARD (Component side view)87R1 1R13R18R17R14R9C4R2R12121112R4R5 R3R8 R21180R6C1 R765C3C2BE6424254041R10R15D17J1

29、IC1Q1D13D10D12D11D9D6D7D8D5D4 D3ED1D14D15X13-964x-xx (J74-0962-02) SWITCH UNITD2D1123456PL254 1PL1AT TSRCTICLKRESETAUDAMFMW170C251R156R15W158R14R62W159R57R59W157R60C52C163R161R159R162R16R13W174R381C380R61R251R151C214R503R125R123C13C14R58R52R54R106R112C164R352C154C153C351TH1R504R155R154R153R322R401R4

30、00R380R408R409R407R406R412R410R41 1R303R302R304R306R305R403R301R402C504C54C502C505R63R64W162C501R1C1R201R203R150W153C452C202C204R455R453R454R451R450R452R205R141R2C2C5R382C6C157R111R113R404R103R108C151C156C155R160R206R207C158C506R8C8R4R6R7C7R5R133R323R1 10R158C101C102R105C103W161W160R48R320R321R140W1

31、73W154R124R122R152R121R117R157R405R143R104W169W168W167R3R250W165R49R413W156R142W166W164R101R102 C104W163BEEBBEEBBEBEEBBEBEEBBEBEBEEBEBEBBEEBBEEBBEEBEBEBEB120214041606180315481417114 152816981Q61IC1Q52Q59Q58Q57Q153Q151Q150Q55Q49Q54Q53Q50Q500Q502Q501Q353Q301Q320Q352Q351IC6IC7Q451Q450Q260IC2Q503IC3A1Q6

32、0 Q56D370D410D50D405D371D352Q51Q350D380D401D400D56D52D51D55D54D402D408D409D403D350D351D53Q261Q201Q203D404D200D260P1IC5D261J1J5J4J2J3X14-613x-xx (J74-0958-22) SYNTHESIZER UNITIC4D150D152D151WH1D100CN14.3320MHzW24W64W76W78R200R202W36R55W73W69W12W99R67W58W104C4R350R370W67W57W70C209L10W66W68W4W6W72W71W7

33、W85W80W39W42W45W48W50W101W102W2R51R65R351R353R66X1C50C17C18C160C152C55W15C15C16C161C350C352C503C162C500C450C451C150C159C56C58C53C57W97W98W103W53W43W51W28W10X2W17R501W3R502R500R261L5R260L4C402C400C401W54W47W95W93W89R1 19W13W61W62W14C9 C250C10W8W9W33W23W27W30W32W37W26W55W56R263R262W22W77W63W65W21R252W

34、105W52W100W94W96W92W91W90W87W59W60W20W25W29W31W35W19W1 1W82W79W83W40W38W41W84W81C3W34W18W49W46W44R120W88W74W754.19MHzTP5VDGS-MTR2DACCKDTHDTCCMP2CKL1RESL8 L7R100L12L6L3W5R1071241225248161 918151212111 61253678411131091212BEBB EEBBEEEBB EKMOQSLNPRT2 1357 46Refer to the schematic diagram for the value

35、of resistors and capacitors. PC BOARD (Foil side view)910C2 C3C4R2R3R4R5R6R7R8R9R21R10R11R12R13R14R15R17R18C11806564 4140252421 1112E BQ1IC1D17J1D15D1D2D3D4D5D6D7D8D9D10D11D12D13D14X13-964x-xx (J74-0962-02)ED1SWITCH UNITPL2 PL1112345654ATTSRCTICLKRESETAUDAMFMR15R14R58W169W168R320R143C502C501R50481C5

36、059C50416EBR106R301R322R303R302W162R305R304R141180R321R306R323BEC103 R105C102W167R156C202R405R1 10R113C158C214EBR503W173R205R207R206R121W154R108W156BER112C506EBBER15014C155C154C1561C153C157R160R203C204R20115C15128R382W161C13R125R140R14220R11121R124R123R122R117C14404145R404W16461C10160EB31R101R104W16

37、5W166R103W163C104R102BC1647R1611BE148R133W160R413R162C163R159ER158C380R48R49C351EBR352BER54R381BEBER52R57C52W157R454R451R450EBEBR452EBR453R455W153R401C452R400R402R41 1R409R412R408R410R13R403R406R407R151EBR157R155R153R152R154R380W174R16W158W159TH1C251R1C1R250R3R5C5R7C7R4R8C8C6R2C2R6R59ER60 BBEC54BER6

38、1R251BEEBR62W170EBEBEBR64R63IC7Q260Q150Q501Q500Q503Q502IC2IC1Q301IC6IC3Q351Q49Q50Q352Q353Q153Q450Q451Q151Q320Q53Q59Q52Q58Q57Q54Q55Q61D54Q261WH1D260P1D261J3X14-613x-xx SYNTHESIZER UNIT(J74-0958-22)A1J1D52D380D200Q203Q201D100D352D151D410D405 D404D401D400 D402 D403D408D409J5J4D152D150D371D351Q350D51D35

39、0 D370IC4J2IC5CN1Q51D56D50D53D55Q60Q56C55W88DGW41R107W1 1C503W2C5006R26114.3320MHzR500R502R501BR260EW25W20W19W31W35W291112W8412W77W82TPW815VW75L5124C532CKR120R1 19S-MTRCMPW7L10X2L12W5R263R262W9C209W8W18W21W22W34W40W33W38W26R202L8W6W4BL7 L6ER200EBW12W30W32W37W27W232DAC150C450C152W17W15W14L3C15W59W83W

40、44W46W49CCKDTCDTHW604.19MHz X1W74W68W67RESW91 W90R353W63W52W47W57W55W56W61W62W64W65W79C352W87W89W36C159W42C402C401L4W3C451C16W39W2491312157610C400W13W1081112243W28W70W69W54C18C17W48W45W50W58C160C162C161R350R370EBC350R51R55R351W80W851252W4324W51W53W66W76W73W72W71C50W781688C4C10W95W96W93R100C9 C250C3W

41、94151R67W105C56W92W99BEW104R252W100C57C58W98W97R66W102 W101R65BEL191W103EBABDFHJCEGI2 1357 460V5V0V5V0V5.0V0V or5.0V0V or5.0V0V5V0V0V5V0Vor5.0V0V5V0Vor5.0V0V5V0Vor5.0V0V5.0V0V5.0V0V4V0.6V4V1.6V0V1V5.0V0V5.0V0V7.3V7.3V7.3V7.3V0V0V4.8V14.4V0V7.3V7.2V7.2V7.3V0V14.4V3.3V0V7.2V7.3V7.3V7.3V7.3V0V4.4V0V2.5

42、V0V5V0V0V5V5.0V0.9V5VB LINECAUTION: For continued safety, replace safety critical components only with manufacturers recommended parts (refer to parts list). indicates safety critical components. For continued protection against risk of fire, replace only with same type and rating fuse(s). Toreduce

43、the risk of electric shock, leakage-current or resistance measurements shall be carried out (exposed parts are acceptably insulated from the supply circuit) before the appliance is returned to the customer.10MUTE5REQ H2 14 37 6GND9CON B.U.8DATAC12 1113RSTREQ CRchAGNDLchDATAHCLK1 2134 3128 7112 16105

44、916151413121110987654321FL+RL+FL-RL-FR-RR-FR+RR+P-ANTTEL MUTEP-CONACCB.U.GND24681012141618202224GNDSTBYVCCGNDSVRRR1FL1AC GNDGNDVCCMUTEGND135791113151719212325TA BRR-RR+FR-FR+FR1GNDRL1RL+RL-FL+FL-CD192317219375R412 100R410 4.7KR409 4.7KR402 10R411 100R406 4.7K R407 4.7KR408 1KR403 10076 546 4511763 1

45、6100.47u50C401+R401C402 0.47u50+R400 4.7C400 22u6.3+R405 100KR404 100KR413100K17232119L13300u16C50+654321T.MUTEGNDMOTGNDMOT+BPACK INGND10KR2611KR260R26347KR26247K47K R570.01 C5247KR55R51 3.3K 1/2W30KR5210K R54R3800.01C38022K R381 10K4.7K R370R350 4.7KR3511KR3523.3u25C350+22KC3510.1u50C352+R353 1K 1/

46、2W0.068C1040.0224.7KR160.22u50C180.22u50C154.7KR130.22u50C174.7KR150.22u50C16R144.7K100u10C159+C1601u50R152 1KR151 4.7KR153 91K430 1u50+180K1u50C162+R157 100R158 33K750C161R154R155R156121110987654321P AN SWL D ATA SL CLKL C EL D ATA LL RESu GNDP AN5VRESETILL GILL+BESD GNDR322 2.2KR301 470R302 470R30

47、3 1KR304 1KR305 1KR306 1K27K47KR320R321R323 1024266059585756555453525150494847464544434241403938373635343332313029282726252423222112345678910111213141516171819206162636465666768697071727374757677787980RESETFWD/REVILLP. O NB.U. DETACC DETP . CONTBEEPAMP STBYSVRREQ HCH CONAMP MUTEMUTEAFCIC2 CLKIC2 DAT

48、AFM+BAM+BPLLDATAPLLCLKVSS 1SDFF/REWMOTORP ANELL C EL RESA VSSR DA T AR QUALA VREF 1IC2 SEL 1IC2 SEL 0L D ATA LL D ATA SL CLKD ATA CD ATA HCH CLKSEL1R CLKREQ CPACK INKEY-REQSEL0VSS 0VDD 1X2X1ICXT2XT1VDD0AVREF 0S METERPHONENOISEAVCONTR1 13484346454849504142494347KR104R103 47KX14.19MHz R105 6.8K15PC103

49、 C10215PR107 R10610K 2.2K581KR1241KR123R120 1KR121 10K4039R119 2.2KR117 4.7K47K47KR1 10100K2.2KR 1112.2K100K1817321651112131627 2832 35 37 38131122113605366028277755535456C56100u6.35.6KR61+47KR60 10u10R5822K100R59C55+C540.01100u16+5355R48100K100KR49R125R10847K7776781KR675375950GND0.01C16310KR162747K6100K5 4 3C1642 198 1110 12R13313VDD1447K11/2W62632523R1 1218R159R161C532-72 2-71YES YESNOYESNOYESMODELNAMEKRC-280RG (M)UNITNO.0-20NOYESNOR370D350KRC-178RG/A(E)KRC-178RYG/YA(E)KRC-13RG (E)KRC-278RG/A(E)KRC-278R