Kenwood-KRC-294-Service-Manual电路原理图.pdf

© 2002-10 PRINTED IN JAPANB51-7981-00 (N)2139CASSETTE RECEIVERKRC-17G/YA/YGKRC-194A/G/YA/YGKRC-266LA/LG/RGKRC-27YA/YGKRC-2904YA/YGKRC-294A/G/YA/YGSERVICE MANUALKRC-266RGKRC-17G/YA/YG, KRC-194A/G/YA/YG (E) KRC-2904YA/YG (E)KRC-266RG (M)Escutcheon(B07-2188-02)45W x 4KRC-266L45W x 4AUTO AMEKRC-29445W x 4KRC-2745W x 4KRC-290445W x 4T.CALLKRC-17KRC-19445W x 4T.CALLKRC-27YA/YG (E) KRC-294A/G/YA/YG (E)KRC-266LA/LG (M)Mounting hardware assy(J21-9701-03)Plastic cabinet assy(A02-1486-13)Screw set(N99-1610-15)Lever(D10-3031-04) x2Antenna adaptor(T90-0523-05)or(T90-0534-05)WIDE BANDDC cord(E30-4790-05)or(E30-6134-05)Screw set(N99-1719-05)AUTO AMEPanel assy (A64-2924-02):KRC-194A/G/YA/YG (A64-2925-02):KRC-17G/YA/YGPanel assy (A64-2927-02)Panel assy (A64-2933-02) Panel assy (A64-2923-02)Panel assy (A64-2917-02)Panel assy (A64-2916-02)Depends on model. Refer to the parts listKRC-17G/YA/YG,194A/G/YA/YG,266LA/LG/RGKRC-27YA/YG,2904YA/YG,294A/G/YA/YG2BLOCK DIAGRAMIC1KEYPAN 5VMUTEB.U. DET. B.U.ACCP-CONT.MUTEPREPOWER ICEQ. AMP.CH ISO AMPNC,MPXE-VOL.CD/MDCHANGERFRONT LchFRONT RchREAR LchREAR RchJ2LCD DRIVERLCDCME1MAINTAPE MECHA.IC5LchRchPRE OUTIC2IC4IC3SP OUTREARJ4PAN IN SWACC DET.P-CONT.J2J5IC1F/EJ1FM+BQ201AM+BQ203AM BPFFM BPFC154,R206C153,R207Q320Q450,451Q49Q50Q350,351,370Q53SW 5VQ54-578VQ58-61ILLUMI.B.U. 5VQ51,52SYSTEM u-COMS1S2S3RST SWQ301D1-15PL1,2ANT.TEL MUTEDECODERRDSIC7Q501,502MP SWRST ICRSTIC6ED1FM 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 CLKRchCOMLchMP INAMMPXOUT RROUT LROUT RFRchLEVELSCLSDAOUT LFRchSTBYMUTERchLchT-MUTEFWDREVB.U.5V8VB.U.CH RSTS MUTE8510B.U.5VAM+BVDD 5VPACK INL RESPHONECHMUTEBEEPSVRAMP. STBYSVRAC GND (BEEP)Lch LchRchLch1200mVTAPE :1681mVCD/MD-CH :3529mVAM :772mVFM :1339mV8VRF GNDOSC GNDIF2 +BAUDIO OUT8VS-METERSDPLL-SCLPLL-SDACM1PLAYHEADL/R55.6mVB.U.5VSW 5V8VB.U.5VAM: 170mVFM: 213mVTAPEPACK IN(FF/REW)AMP. MUTEFF/REWB.U.5VR QUALIF COUNTR CLKR DATASW 5VMP OUTQUALAFCNOISEB.U.5VILLL CE(X16)A1TEL DETD3805VR205MKRC-17G/YA/YG, 194A/G/YA/YG, 266LA/LG/RGKRC-27YA/YG, 2904YA/YG, 294A/G/YA/YG3a71 SYNTHESIZER UNIT (X14-687x-xx)COMPONENTS DESCRIPTIONRef.No. Application/Function Operation/Condition/CompatibilityIC1 SYSTEM µ-COM Controls the unit.IC2 E-VOLUME Controls the volume and selects source.IC3 MUTE LOGIC Controls the mute output.IC4 POWER AMPLIFIER For the speaker output.IC5 EQUALIZER AMPLIFIER For the cassette tape's signal.IC6 RESET Resets the power.IC7 RDS DECODER Decodes the radio data.Q49 ACC DETECTION SW Outputs “H“ during the ACC off.Q50 BACK-UP DETECTION SW Outputs “H“ when the back-up voltage is under 9.2V.Q51,52 BACK-UP 5V DRIVER Works when back-up current exists.Q53 P.ON 5V SW Works during the power on.Q54,55 8V SW Works during the power on.Q56,57 8V DRIVER Works during the power on.Q58,59 ILLUMI +B SW Works during the power on.Q60,61 ILLUMI +B DRIVER Works during the power on.Q150 E-VOL MUTE SWWorks when the back-up current is detected or the changer mute works or system µ-com mute works.Q151 SVR FORCED DISCHARGE SW Works when the amplifier mute works.Q153 PRE OUT MUTE SWWorks when the back-up current is detected or the changer mute works or system µ-com mute works.Q201 FM +B SW Works during FM mode.Q203 AM +B SW Works during AM mode.Q260 MOTOR +B SW Works during the tape mode.Q261 MOTOR +B DRIVER Works when Q206 works.Q301 CD-CH RESET SW Works when the power is reset and the reset SW works.Q320 PANEL 5V SW Works when the back-up current exists and the panel is attached on the unit.Q350 P.CON DRIVER SW Does not work during the power off and the ALL OFF.Q351 P.CON PROTECTION SW Works when the P.CON is short-circuited on the GND.Q352 P.CON PROTECTION INHIBIT SW Inhibits the protection SW in a moment during the P.CON on.Q353 P.CON DRIVER SW Does not work during the power off and the ALL OFF.Q450,451 PRE OUT MUTE SWWorks when the back-up current is detected or the changer mute works or system µ-com mute works.Q500 AUDIO OUTPUT BUFFER For RDS decoder.Q501,502 AFC TIME CONSTANT SW Works during receiving FM signal.Q503 NOISE BUFFER For noise level detection.KRC-17G/YA/YG, 194A/G/YA/YG, 266LA/LG/RGKRC-27YA/YG, 2904YA/YG, 294A/G/YA/YG4a71 SYSTEM MICROCOMPUTER UPD780058GC (IC1 : X14)Pin No. Pin Name I/O Function Operating Condition1 PANEL I Panel detection. “L“ : Panel exists.2 L CE O LCD driver chip enable. -3 L RES O LCD driver reset. -4 AVSS - GND. -5 R DATA I RDS data. -6 R QUAL I RDS receiving. -7 AVREF 1 - Reference voltage. -8 IC2 SEL 1 I Selector. “L“ : Normally.9 IC2 SEL 0 I Selector. “L“ : Normally.10 - - - -11 L DATA L I LCD driver communication data. -12 L DATA S O LCD driver communication data. -13 L CLK O LCD driver communication clock. -14,15 - - - -16 DATA C I Changer communication data. -17 DATA H O Changer communication data. -18 CH CLK I Changer communication clock. -19-26 - - - -27 MOTOR O Cassette tape motor SW. -28 FF/REW I Cassette tape FF/REW detection. “L“ : FF or REW works.29-31 - - - -32 SD I Signal detection.“H“ : Signal exists.“L“ : Signal does not exist.33 VSS 1 - GND. -34 - - - -35 PLL CLK O Front-end communication clock. -36 PLL DATA I/O Front-end communication data. -37 AM +B O AM power supply SW. -38 FM +B O FM power supply SW. -39 IC2 DATA I/O E-volume communication data. -40 IC2 CLK O E-volume communication clock. -41 AFC O FM noise detection / Time constant SW. -42 MUTE O Mute control. -43 AMP MUTE O Power amplifier mute. -44 - - - -45 CH CNT O Changer control. -Pin No. Pin Name I/O Function Operating Condition46 REQ H O Changer request. -47 - - - -48 SVR O SVR control. -49 AMP STBY O Power amplifier stand-by. -50 BEEP O Buzzer signal output.51,52 - - - -53 P.CONT O Power control SW. -54 ACC DET I ACC detection. -55 B.U. DET I Back-up detection. -56 P.ON O Power SW. -57 ILLUMI O Illumination SW. -58 FWD/REV I Cassette mechanism FWD/REV detection. -59 - - - -60 RESET I System reset signal input. -61 SEL 1 I Destination SW. -62 R CLK I RDS clock. -63 REQ C I Changer request. -64 PACK IN I Cassette tape pack-in detection. -65 KEY-REQ I Key signal input detection. -66 SEL 0 I Destination SW. -67 VSS 0 - GND. -68 VDD 1 - 5V power supply. -69 X2 - Main system clock. -70 X1 I Main system clock. -71 IC - GND. -72 - - - -73 XT1 - 5V power supply. -74 VDD 0 - 5V power supply. -75 AVREF 0 I A/D converter reference voltage. -76 S METER I S-meter detection.“H“ : S-meter exists.“L“ : S-meter does not exist.77 PHONE I -Navigation mute : 2.5V or more.Telephone mute : 1V or less.78 NOISE I FM noise detection. -79 AV CONT O A/D converter reference voltage. -80 - - - -MICROCOMPUTER'S TERMINAL DESCRIPTIONKRC-17G/YA/YG, 194A/G/YA/YG, 266LA/LG/RGKRC-27YA/YG, 2904YA/YG, 294A/G/YA/YG5ADJUSTMENT(2-LINE TAPE)BABA(FWD)(RVS)HEIGHT(FWD)HEIGHT/AZIMUTH(FWD)HEIGHT/AZIMUTH(RVS)TAPE SPEEDHEIGHT(RVS)F ''FRRNo ITEM INPUT SETTINGSRECEIVERSETTINGSALIGNMENTPOINTSALIGN FORSDSDHEADHEIGHTHEADAZIMUTHTEST MODE : ON While holding the “FM“ key and preset “6“ key, reset the unit.TEST MODE : OFF Reset the unit.98.1MHz0 dev35dBµ(ANT input)990 kHz0% mod35dBµ(ANT input)SCC-1659TCC-15310kHzTEST MODE: ONFM 98.1MHzTEST MODE: ONAM 990 kHzTAPE PLAYConnect an ACvoltmeter andoscilloscope toSP outputs.TAPE PLAYPreset “1“ key,andpreset “6“ keyPreset “1“ key,andpreset “6“ keyHead Height ScrewHeadAzimuthScrewWhile holding preset “1“ key, press and hold preset “6“ keyfor a few seconds.“ADJ OK“ is good.“ADJ NG“ is not good.While holding preset “1“ key, press and hold preset “6“ keyfor a few seconds.“ADJ OK“ is good.“ADJ NG“ is not good.1) During FWD transport adjust F and F ' so that line A of 2-LINE TAPE passes through the center of the head shieldplate (core center area)2) During RVS transport adjust R and R ' so that line B of 2-LINE TAPE passes through the center of the head shieldplate (core center area)3) After the alignment above, reverse the transport directionand check the FWD alignment again. If it is deviated, performalignment again. (Tape used : SCC-1659,manufactured by A-BEX)Adjust the azimuth for each L ch/R ch or FWD/RVSbecomes maximum.1(1)12FM SECTIONAM SECTIONCASSETTE DECK SECTIONA B C D E123456764.3320MHzW24W64W76W78R200R202W36R55W73W69W12W99R67W58W104C4R350R370W67W57W70C209L10W66W68W4W6W72W71W7W85W80W39W42W45W48W50W101W102W2W200R51R65R351R353R66X1C50C17C18C160C152C55W15C15C16C161C350C352C503C162C500C450C451C150C159C56C58C53C57W97W98W103W53W43W51W28W10X2W17R501W3R502R500R261L5R260L4C402C400C401W54W47W95W93W89R119W13W61W62W14C9C250C10W8W9W33W23W27W30W32W37W26W55W56R263R262W22W77W63W65W21R252W105W52W100W94W96W92W91W90W87W59W60W20W25W29W31W35W19W11W82W79W83W40W38W41W84W81C3W34W18W49W46W44R120W88W74W754.19MHzTP5VDGS-MTRPD APCK2D ACCKDTHDTCCMP2CKL1RESL8L7R100L12L6L3W5R10716811 58161912252415761092348121113LR1 24BE BEE BBEBE111212BEB EA1Q60Q56D370D410D50D405D371D352Q51Q350D380D401 D400D56D52D51D55D54D408D409D350D351D53Q261Q201Q203D404D200D260P1IC5D261J1J5J4J2J3IC4D150D152D151WH1D100CN1W170C251R156R15W158R14R62W159R57R59W157R60C52C163R161R159R162R16R13W174R381C380R61R251R151C214R503C600C601W171R125R123C13C14R58R52R54R106R112C164R352C154C153C351TH1R504R155R154R153R322R401R400R380R408R409R407R406R412R410R411R303R302R304R306R305R403R301R402C504C54C502C505R63R64W162C501R1C1R201 R203R150W153C452C202 C204R455R453R454R451R450R452R205R141R2C2C5R382C6C157R111R113R404R103R108C151C156C155R160R206R207C158C506R8C8R4R6R7C7 R5R133R323R110R158C101 C102R105C103W161W160R48R320R321R140W173W154R124R122 R118R152R121R117R157R405R143R104W169W168W167R3R250W165R49R413W156R142W166W164R101R102C104W163114152881471411345601208061214018169BEBEBEBEBEBEBEBEBEBEBEBEBEBEBEBEBEBEBEBEBEBEBEBEBEQ61IC1Q52Q59Q58Q 57Q153Q151Q150Q55Q49Q54Q53Q50Q500Q502Q501Q353Q301Q320Q352Q351IC6IC7Q451Q450Q260IC3IC2Q503Refer to the schematic diagram for the values of resistors and capacitors.PC BOARD (FOIL SIDE VIEW)SYNTHESIZER UNIT X14-687x-xx (J74-1319-02)Ref. No address Ref. No address Ref. No address Ref. No address Ref. No address Ref. No addressIC1 4DIC2 3CIC3 4CIC4 4BIC5 6DIC6 5DIC7 2EQ49 5CQ50 5CQ51 5CQ52 5CQ53 6CQ54 5CQ55 5BQ56 6BQ57 6BQ58 6CQ59 6CQ60 6BQ61 6CQ150 4CQ151 4BQ153 2CQ201 2CQ203 2CQ260 3EQ261 3EQ301 4DQ320 5EQ350 4BQ351 4CQ352 4CQ353 5CQ450 2BQ451 2BQ500 2DQ501 3DQ502 3DQ503 3DX14-687x-xxF G H I J12345677PL1PL2FMAMAUDRST654321ATTVOLSRCTI154CLKD15D1D2D3D4D5D6D7D8D9D10D11D12D13D14X16-1512-7x (J74-1300-02)SWITCH UNIT SWITCH UNITX16-1512-7x (J74-1300-02)C5C2C3C4R2R3R4R5R6R7R8R9R21R10R11R12R13R14R15R17R18C1124416465 8040 25111221BEQ1IC1D17J1PC BOARD (COMPONENT SIDE VIEW) (FOIL SIDE VIEW)Refer to the schematic diagram for the values of resistors and capacitors.Ref. No addressIC1 3IQ1 4IX16-1512-7xA B C D E12345671343128711216105916 15 14 13 12 11 10876543 2FL+ RL+ FL- RL- FR- RR- FR+ RR+P-ANT P-CONACC19231721937 5R412 100R410 4.7KR409 4.7KR402 10R411 100R406 4.7KR407 4.7KR408 1KR403 1007654645117631610 0.47u50C401+R401C402 0.47u50+R400 4.7 C400 22u6.3+100K 100KR413 100K0.013.3K 1/2WR370 4.7KR350 4.7KR351 1KR3523.3u25C350+22KC3510.1u50C352 +1K0.068551KR671816162636465666768697071727374757677787980PANELSEL 1R CLKPACK INVDD 1X2X1ICXT1VDD 0S METER2A GNDREQ CDATA C8B.U.3CONMUTE45910DGNDREQ H12967CLKRch 1310 6RST111275DATA HLch13 11 12 8 4 3121/2W1/2WREQ CKEY-REQSEL 0VSS 0AVREFOPHONENOISEAV CONTR107R1062.2K10K6247KR1056.8KX1C10215P15PC10310R1000.022C104R5547KKR57C5254R353Q351T-MUTER38010K0C2RR104 47KR103 47KR101 47KR1025753586063RL-BUYEL9TEL MUTEBRN121110VIOL/BLKGRN/BLKRR+RR-RL-VIOL151314RL+GRN1613 5 7RR+ RL+FL+ FL-FR-RR- FR+22685741368GND4ACCP-CONBABLK1ANT. CONP. CONBLU/WHTBLU/WHTRED423GRY/BLKWHT/BLKGRY765FR-FR+FL-WHT8FL+R261R262 47KGND1PACK IN21/2W1KR26010KR263 47KGND5MOT3MOT4T.MUTE62827+BGNDQ58,59Q60,61Q350,353Q3527678R405 R404R382 47KR514.19MHz47KR10812345C101 0.01+B+B+B+B+B+B+B+B+B+B+B+B+5V+5V+5V+5V+5V+5V+5VIC6(E30-4790-05)DC147K47K22K22K22K47K10K47K47K22K10K47KJ4J2D400D401D408D405D410D409D404D261D5D351D370ANT-CON.Q350Q351D352Q353Q352Q301Q58Q60Q61Q59D56ATOP VIEWJ4D371ILLUMI+B SWILLUMI+B DRIVERDRIVER SWP.CON PROTECTION SWQ49P-CON.P.CONDETECTIONACCD3D100MOTOR+B SWQ260MOTOR+BDRIVERD260WH1Q261RESETRESETCD-CHSWP.CON PROTECTIONINHIBIT SWSW0.9V0V or 5.0V0V0V o0V5.0V0V5.0V1V0V5.0V0V0V5.0V5.0V2SB1565DTA114EDTA124EKDTA144EKDTC114TKDTC114YKDTC124EKDTC143TKDTC144EKKRC103S2SA1036K2SC2412K2SB15482SB12772SB14432SA1037KKRA102SKRC104SLA3161TDA7479DCAUTION : For continued safety, replace safety critical components only with manufacturer's recommended parts (refer to parts list).Indicates safety critical components. To reduce the risk of electric shock, leakage-current or resistance measurements shall becarried out (exposed parts are acceptably insulated from the supply circuit) before the appliance is returned to the customer. DC voltages are as measured with a high impedance voltmeter. Values may vary slightly due to variations between individualinstruments or/and units.!F G H I J16 15 14 13 12 11 10 9876543 2 1FL+ RL+ FL- RL- FR- RR- FR+ RR+P-ANT P-CONACCB.UGND19231721937 5L1C50 3300u16+0.013.3K 1/2W33KR5210KR54R370 4.7KR350 4.7KR351 1KR3523.3u25C350+22KC3510.1u50C352 +1K0.068100u10C159+C16010u16R152 1KR151 4.7K91KR153180KC162 1u50+R157 100R158 33KR155 430R156121110987654321PAN 5WL DATASL CLKL CEL DATALu GND PAN5VRESETILL GNDILL +BESD GNDR322 2.2K R301 470 R302 470R303 1K R304 1K27K 47KR320R32148 49431312211 6055C56100u6.35.6KR61+47KR6010u10R5822K100R59C55+C540.01100u16+50GND7R162 47K6543C1640.01219811101213VDD14C53F1 (10A)R159 100K156 55 54 53 52 51 50 49 48 47 46 45 44 43 4240393837363534333231302928272625242322211 2 3 4 5 6 7 8 910 11 12 13 14 15 166162636465666768697071727374757677787980P.ONB.U.DETACC DET P.CONTBEEPAMP STBYSVRREQ HCH CONAMP MUTEMUTEAFCPLL DATAPLL CLKVSS 1IF COUNTSDFF/REWMOTORPANELL CE L RES AVSSRDATAR QUALIC2 SEL 0 L DATALL DATASDATACSEL 1R CLKPACK INVDD 1X2X1ICXT1VDD 0S METERR306 1K21TH1P110R3231/2W1/2WQ151Q153Q32016DATAH17CH CLK18 19 20IC2 SEL 1AVREF 1L CLK16 17 1811 12 1328274.7KR117R119 2.2KR120 1KR121 10K1K1KR123 10KR122R124IC2 CLKIC2 DATAFM+BAM+B4.7KR125363539373840413241REQ CKEY-REQSEL 0VSS 0AVREFOPHONENOISEAV CONTR107R1062.2K10K6247KR1056.8KX1C10215P15PC1033215758596010R1000.022C104RESETFWD/REVILLUMI55R5547K47KR57C525454R353Q351534850 49 434546T-MUTER38010K0.01C38022KR381R104 47KR103 47KR101 47KR140 47K2.2KR142 47KR110 100KR113 2.2KR102L RESR305 1K357R49100K22KR48532131115 7 913 15 17 19 23 25TABRR+RR- FR- FR+ FRIGNDRLI RL+ RL- FL-FL+ CDGND2 4STBY6VCC8GND10SVR12RRI14FLI16ACGND18GND20VCC22MUTE24GND4.7KR140.22u50C167504.7K0.22u50C18R16 4.7K0.22u50C15R131u50+0.22u504.7KR15C1717 19 232124252326R154C16158605 6IC4Q350,353Q352Q51,5276783 5 7 9382 47KR5147KR13310KR161C163 0.014.19MHz47KR108100KR111R11212345C101 0.01+B+B+B +B +B+B+B+B+B+B+B+B+B+B+5V+5V+5V+5V +5V+5V+5V+5V+5V+5V+5V+5V+5V+5V+5V+5VP5VP5VP5VP5V P5V P5V+5VIC3SYNTHESIZER UNIT (X14-687X-XX)IC4IC1IC622K22K47K10K47K47K10K22K22KD50D52 D51Q50D351D370ANT-CON.Q350Q351D352353Q352Q151D150D152D151J3Q32001Q53Q52Q51D53D54Q