Kenwood-KRC-20-G-Service-Manual电路原理图.pdf

© 2002-1 PRINTED IN JAPANB51-7881-00 (N)1924CASSETTE RECEIVERKRC-20SA/GSERVICE MANUAL40Wx4HIGH POWERKRC-20SLOUDPWROFFAMEAUTO ADJCLKSRCAUDT. CALLA. ADJCRSCREWPRFFOGLever(D10-3031-04)x2Plastic cabinet assy(A02-1486-13)Escutcheon(B07-2124-02)Knob (ATT)(K25-1388-03)Cassette lid(A53-1638-13)Panel assy(A64-2519-02)Mounting hardware assy(J21-9491-13)DC cord(E30-4959-05)Antenna adaptor(T90-0523-05)KRC-20SA/G2BLOCK DIAGRAMIC1KEYPAN 5VMUTEB.U. DET. B.U.ACCPOWER ICEQ. AMP.CH ISO AMPNC/MPX/E-VOL.FRONT LchFRONT RchREAR LchREAR RchJ2LCD DRIVERLCDMAINTAPE MECHA.IC5IC2IC4, Q151IC3,Q150SP OUTPAN IN SWACC DET.P-CONT.J2IC1FM+BQ200,201AM+BQ202,203AM BPFFM BPFQ320Q50Q350-353Q53SW 5VQ54-57COM+BQ58-61ILLUMI.B.U. 5VQ51,52SYSTEM u-COMRST SWQ301MOTOR SWRSTQ260,261ED1 Q1FM ANTAM ANTRF GNDFM+BAM+BOSC GNDOSC GNDOSC GNDVTPLL +BIFC OUTSDASCLDIG GNDIF1+BIF1 GNDS-METERIF2 GNDSDFM+BSW5VACC DETB.U. DETSCLMUTESDAP CONPANELHOLDL CLKLDATASLDATALFWD/REVMOTORRchCOMLchMP INAMMPXOUT RROUT LROUT RFLEVELSCLSDAOUT LFSTBYMUTERchLchT-MUTEFWDREVB.U.5VB.U.8V B.U.S MUTE465B.U.5VAM+BVDD 5VPACK INL RESANT CONBEEPSVRAMP. STBYSVRAC GND (BEEP)RchLch8VRF GNDOSC GNDIF2 +BAUDIO OUT8VS-METERSDPLL CLKPLL DATAPLAYHEADRL55.6mVB.U.5VSW5V8VB.U.5VAM: 170mVFM: 400mVTAPEPACK IN(FF/REW)AMP. MUTEFF/REWB.U.5VILLUMI.(X16- )(X14- )MA15VD200P-CONT./ANT-CONT.KRC-20SA/G3a71 SWITCH UNIT (X16-1492-XX)COMPONENTS DESCRIPTIONRef.No. Component Name Application/Function Operation/Condition/CompatibilityIC1 LC75853NE LCD driver with key-matrixQ1DTA114EK or UN2111 or KRA102SKey-matrix permission SW Ready on key-matrixa71 SYNTHESIZER UNIT (X14-6852-71)Ref.No. Component Name Application/Function Operation/Condition/CompatibilityIC1 LC72366-9592 System MI-COM. System controlIC2 TDA7461ND E-VOL. & N.C. MPX Controls sound volume. Selects each source.IC3 HD74HC27FP Mute logic 3-input NOR gate × 3IC4 TDA7384A Power IC Amplifies power so that the speaker can drive audio signal.IC5 LA3161 Equalizer amplifier Equalizer amplifier for cassette tape soundQ50 2SC2412K or 2SD601ABACK-UP detection While BACK-UP is added, a base becomes Hi, and Q50 is (Momentary power down detection) SW turned on.Q51 2SB1443BACK-UP 5V AVRWhile BACK-UP is added, AVR outputs +5V.Q52 2SC2412K or 2SD601A Q51 and Q52 is inverted Darlington connection.Q53DTA114YK or UN2114 or KRA107SP.ON 5V SW While a base becomes Lo, Q53 is turned on.Q54DTC144EK or UN2213 or KRC104SCOM+B SWWhile Q54's base becomes Hi, Q55 is turned on.Q55DTA124EK or UN2112 or Works during POWER ON mode.KRA103S2SA2057 or 2SB1548 (P) or Q56 2SB1565(E,F) or While Q57's base becomes Hi, Q56 is turned on.2SB1655(E,F)COM+B AVRQ56 and Q57 is inverted Darlington connection.Q57 2SC2412K or 2SD601AQ58DTC144EK or UN2213 or KRC104SIllumination +B SWWhile Q58's base becomes Hi, Q59 is turned on.Q59DTA124EK or UN2112 or Works during POWER ON mode with a panel KRA103Sattached to the set.2SA2057 or 2SB1548 (P) or Q60 2SB1565(E,F) or While Q61's base becomes Hi, Q60 is turned on.2SB1655(E,F)Illumination +B driverQ60 and Q61 is inverted Darlington connection.Q61 2SC2412K or 2SD601ADTC124EK or UN2212 or When BACK-UP detection SW or CHANGER RESET SW or Q150KRC103SElectric volume mute SW MI-COM.'s mute works, a base becomes Hi, and Q150 is turned on.Q151DTC114YK or UN2214 or When POWER IC RESET is activated, a base becomes Hi, KRC107SSVR discharge SWQ151 is turned on.Q200DTC124EK or UN2212 or KRC103S FM +B SWQ201 is turned on when Q200's base becomes Hi.Q201 2SB1277(Q,R)Works during FM reception mode.Q202DTC124EK or UN2212 or KRC103S AM +B SWQ203 is turned on when Q202's base becomes Hi.Q203 2SB1277(Q,R)Works during AM reception mode.KRC-20SA/G4COMPONENTS DESCRIPTIONRef.No. Component Name Application/Function Operation/Condition/CompatibilityQ260DTC114YK or UN2214 or KRC107S Motor +B SWWhen Q260's base becomes Hi, Q261 is turned on.Q261 2SB1443Works during TAPE mode.Q301 DTA144EK or UN2113 Changer reset SW When a base becomes Lo, Q301 is turned on.Q320 2SA1037K Panel 5V SWWhile a panel is attached to the set, a base becomes Lo, and Q320 is turned on.Q350 2SB1277(Q,R) P-CON. driver When Q353's base becomes Hi, Q350 is turned on.Q351 2SA1037K P-CON. protection SW Works when P-CON is being short-circuited on GND.Q352DTA124EK or UN2112 or KRA103SP-CON. protection inhibit SW Inhibits protection SW function when P-CON works momentary.Q353DTC114YK or UN2214 or Q353 is turned on when a base becomes Hi. KRC107SP-CON. SWWorks during POWER ON mode.Q370 2SB1277(Q,R)Q370 is turned on when Q371's base becomes Hi.Q371DTC114YK or UN2214 or ANT-CON. SWWorks during TUNER mode.KRC107SKRC-20SA/G5MICROCOMPUTER'S TERMINAL DESCRIPTIONa71 Terminal Description (IC1 : X14-6852-71)Pin No. Pin name I/O Description Processing Operation1 XIN I Main clock resonator connection terminal2 GND - TEST terminal 2 Connected to GND lines.3 L DATA L I Data input from the LCD driver IC4 L DATA S O Data output to the LCD driver IC5 L CLK O Clock output to the LCD driver IC6 L CE O CE output to the LCD driver IC7 SDA I/O Data input/output with the E-VOL. IC8 PLL DATA I/O Data input/output with the F/E9 PLL CLK O Clock output to the F/E10 SD I SD input from the F/E Hi : Station detected11 DATA C I Data input from changers12 DATA H O Data output to changers13 CH CLK I/O Clock input/output with changers14 - O - N.C. (Not used)15 MOTOR O Cassette motor on/off output Hi : Motor ON16 SCL O Clock output to the E-VOL. IC17-24 - O - N.C. (Not used)25 AM+B O AM+B ON/OFF output Hi : during AM reception26 FM+B O FM+B ON/OFF output Hi : during FM reception27 PACK IN I Cassette tape Pack-in detection input Lo : Pack-in28 FF/REW I FF/REW detection input Lo : FF/REW, Hi : PLAY29 GND I - Connected to GND lines.30 GND I - Connected to GND lines.31 VDD - Positive power supply connection terminal Connected to B.U. 5V lines.32 REQ C I Request input from changers Lo : Request33 MUTE O Audio mute on/off output Hi : Mute ON34 CH CON O Changer control Lo : Standby, Hi : ON35 REQ H O Request output to changers Lo : RequestWhen the momentary power down, after ACC 36 SVR O Power IC reset terminal ON/OFF is detected and after POWER OFF, the output becomes Hi temporarily.37 AMP STBY O Power IC standby control output Hi : POWER ON mode38 AMP MUTE O Power IC mute control Lo : Mute39 P CON O Power control Hi : POWER ON mode40 ANT CON O Antenna control Hi : during FM/AM reception41 SW5V O SW 5V control Lo : POWER ON mode42 ILL O Illumination AVR ON/OFF control terminal Hi : POWER ON mode43 - O - N.C. (Not used)44 BEEP O BEEP sound output45-47 - O - N.C. (Not used)48 ROLL OFF I Roll off input Pull down to GND lines. (Not used)49NOISE CANCELLERI Noise canceller input Pull down to GND lines. (Not used)50 SEL1 I Destination input 1 Hi : KRC-20S51 SEL2 I Destination input 2 Hi : KRC-20S52 SEL3 O Destination input 3 N.C. (Not used)KRC-20SA/G6MICROCOMPUTER'S TERMINAL DESCRIPTIONPin No. Pin name I/O Description Processing Operation53 EQ MUTE O Tape equalizer mute on/off output N.C. (Not used)54 FWD/REV I FWD/REV mode detection input Lo : REV mode55 - O - N.C. (Not used)56 REMO IData input from the remote control N.C. (Not used)light sensor57-60 - O - N.C. (Not used)61 ACC DET I ACC detection input Hi : ACC ON62 B.U. DET I Momentary power down detection inputHi : When momentary power down detected or B.U. OFF, Lo : B.U. ON63 S METER I S-meter input from the F/E64 PANEL I Panel detaching detection input Lo : Panel not detached65 GND I - Connected to GND lines.66 GND I - Connected to GND lines.67 HOLD I MI-COM. HOLD input Lo : Hold68 VDD - VDD connection terminal Connected to B.U. 5V lines.69 GND I - Connected to GND lines.70 GND I - Connected to GND lines.71,72 - O - N.C. (Not used)73 VDD - Positive power supply connection terminal Connected to B.U. 5V lines.74 GND I - Connected to GND lines.75 GND I - Connected to GND lines.76 VSS - Ground connection terminal Connected to GND lines.77,78 - O - N.C. (Not used)79 GND - TEST terminal 1 Connected to GND lines.80 XOUT O Main clock resonator connection terminalKRC-20SA/GTEST MODE / ADJUSTMENT1. How to enter the test mode Reset the unit while holding the FM key and preset 6 key. All indication segments go ON at the beginning of the testmode.2. How to release the test mode Simply reset the unit. (NOTE) The test mode is not canceled by ACC OFF,power OFF, momentary power down or the panel off.3. Audio adjustment Set the volume level to -10dB (which is shown as “30“ onthe display). Loudness OFF. The BASS / TREBLE and BALANCE / FADER controlscan be set to the full boost / full cut and full right / full leftand full front / full rear respectively by pressing the TrackUp / Track Down keys. Sound coordination doesn't appear for the Audio modefeed.Set the controls and switches as follows.BALANCE : center position BASS : center position LOUDNESS : OFFFADER : center position TREBLE : center position(2-LINE TAPE)BABA(FWD)(RVS)HEIGHT(FWD)HEIGHT/AZIMUTH(FWD)HEIGHT/AZIMUTH(RVS)TAPE SPEEDHEIGHT(RVS)F ''FRRTEST MODEADJUSTMENT7ITEM TAPEOUTPUTSETTINGSRECIEVERSETTINGSALIGNMENTPOINTSNo.HEADHEIGHTHEADAZIMUTHSCC-1659TCC-15310kHz-Connect an ACvoltmeter andoscilloscope toSP outputs.TAPE PLAYTAPE PLAYHead Height ScrewHead Azimuth ScrewALIGN FOR1) During FWD transport adjust F and F ' so that line Aof 2-LINE TAPE passes through the center of thehead shield plate (core center area)2) During RVS transport adjust R and R ' so that line Bof 2-LINE TAPE passes through the center of thehead shield plate (core center area)3) After the alignment above, reverse the transportdirection and check the FWD alignment again. If itis deviated, perform alignment again. (Tape used :SCC-1659, manufactured by A-BEX)Adjust the azimuth for each L ch/R ch or FWD/RVSbecomes maximum.12CASSETTE DECK SECTIONA B C D E1234567AMFMAUD PL1RST654321PL2ATTCLIKAUTOSRC129D2D1D4D3D5D6D7D8D9D10D11D12D14D15D13X16-1492-xx (J74-1298-02)PC BOARDRefer to the schematic diagram for the values of resistors and capacitors.(COMPONENT SIDE VIEW) (FOIL SIDE VIEW)8X16-1492-xx (J74-1298-02)R13R14R18R8R11R12R19C4C2C1 C5R3R4R2R1R21R20R5R6C66449481233 16117321112EBQ1IC1D17J1Ref. No. addressIC1 3DQ1 4DX16-1492-xxF G H I J K L M N O1234567REMOGNDW100W28W75W85W22W33W73W67W72W65W13W96W35W200W36W68W64W15W8W31W71W69W27W79W76W34W39W43W46W51W98W99W23L3R50R65R351R353R66W48W10X1C50C17C18C160C152C55W40W20C15C16C161C350C352C162C450C451C150C159C56C58C53C57W58W94W95W101W54W41W53W29W12W16W18W7R261L5R260L4C402C400C401W5W14W17W11C4C3C9C250C10W92W9W70W59W30W25W50W24W87W80W97 W93W89W88W103W86W90W78W61W3W2W1W56W82W44W47W83W19W74W81W49W77W37W63W32W55W102W57W52W60W62W38W84W42W21W45L14.5MHzR202R55R67R350R370W105R371L8C206L9R373R116W26C320R138R13291618251224217651093841112 13L R12421611518111122EBEBBEBEBEBEBEBE(J74-1317-12)CN1Q60Q56D411D405D352Q51Q350D401D400D56D52D51D55D54D402D408D409D403D350D351/W104D53Q201Q203D200Q261D404D260IC5J4J5J2J3J1A1D370IC4D50Q370D371D151D150D152P1 WH1D100CN2D261X14-6852-71W122R58R155R15W112R14R62W113R152R129R59W133W119R413C202R16R13W111W121R372R151C101C600R324C163R161W135R102R118R119R115R114R126R52R54R105R106R103R207R206C164R352R320C155C154C157C156C153C151C506R127R154R150R153R322R401 R400R408 R409R407 R406 R412R410 R411R303R304R306 R305R403R301R402R321W129C54R63R64R57W114C52W116R201R203R200C200C452C201R205R455R453R454R451R450R452R104C1C2C6C5C7C8R6R7R5R2R3R4C14R8C13R1C251R251R323W131W125C102C103W128W130R160W124W118R158W117W115W123R157R156R159R250R405R404R137W134W120R122R125R120R121R123R111R109W126R110W127R108W132R131C321TH1C351EB171481 1428 15180642540244165EBEBBEBEEBBEEBEBEBEBEBEBBEEBBEBEBEEBEBEBBEBEQ61Q52Q371Q59Q58Q57Q153Q151Q150Q55Q54Q53Q50Q353Q301Q320Q352Q351Q202Q200Q451Q450Q260IC3IC2IC1Ref. No. addressIC1 5JIC2 5KIC3 5KIC4 2JIC5 5HQ50 4IQ51 4HQ52 4HQ53 4HQ54 4HQ55 3HQ56 2GQ57 3GQ58 4GQ59 4GQ60 3GQ61 3GQ150 4LQ151 3JQ200 4LQ201 4LQ202 5LQ203 4LQ260 6LQ261 6LQ301 6IQ320 6HQ350 4IQ351 4JQ352 4IQ353 4IQ370 3JQ371 4JX14-6852-71PC BOARD (FOIL SIDE VIEW)Refer to the schematic diagram for the values of resistors and capacitors.910A B C D E F G H I J12345671 2 63 4 547K47K22K10K47K22K22K47K10K47K47K47K10K47K10K22K22K47K22K47K22K22K22K22K22K47K10K22KIC3IC5KRC-20S (1/2)SYNTHESIZER UNIT (X14-6852-71)IC4IC2IC1AME1 (D40-1136-05) 0V0V5V0V5V0V5V10.2V5.0V5.0V5.0V14.4V14.2V 8.2V0V5V5V0V0V5V5V0V0V0V5.0V5V0V0V5V5V13.6V14.4V14.4V14.4V13.6V10.2V0V0V or 5.0V5V0V5V0V0V5.0V0V5.0V0V 0V 0V 0V1.3V 0.8V 3.5V 0V 8.2V 3.5V 0.8V 1.3V0V7.3V 4.9V 7.3V14.4V7.3V0V7.3V 7.3V 7.2V 7.2V0V7.2V 7.2V 7.3V 7.3V0V7.3V14.4V7.3V 3.3V 7.3V0V5V0V0V5V0V5V0V5V0V5V0V5.0V4.0V 4.0V 4.0V 4.0V4.0V 4.0V 4.0V 4.0V 4.8V4.0V0V5V0V5V0V8.2V8.2V8.2V8.2V8.2V8.2V8.2V5.1V3.4V0V4V0V4V0V5VSWANT-CON.A1J2D50WH1D261D260Q260D52D51Q50D3704.7KR350Q350P-CON.Q351D352Q353Q352Q151D151D152D150Q150Q201D200Q203FM+B SWJ1CN1J3Q320Q55Q54D55Q56Q57+B SWQ301Q53Q52Q51D53D54Q58Q60Q61Q59D56Q371Q261DRIVERQ51,52BACK-UP5V AVRBACK-UP DETECTION(MOMENTARY POWERDOWN DETECTION)SWCOMAMPLIFIEREQUALIZERIC1 :IC2 : TDA7461NDLC72366-9592IC3 : HD74HC27FPIC4 : TDA7384AIC5 : LA3161Q50,52,57,61 : 2SC2412K or2SD601AQ51,261 : 2SB1443Q53 : DTA114YK orUN2114 orKRA107SKRA103S2SA2057 orKRC104SQ54,58 : DTC144EK orUN2213 orQ55,59,352 : DTA124EK orUN2112 orQ56,60 :2SB1655(E,F)2SB1565(E,F) or2SB1548(P) orQ201,203,350,370 : 2SB1277(Q,R)Q301 : DTA144EK orUN2113Q320,351 : 2SA1037KD50 : S2V20A or1N5393G-M6D51 : MA4068(N)-M orD52 : MA4051-LD53,260,261,350,351,370,371: AM01Z orERA15-01 orDSM1SD2HZS7A3LD54 : MA4056(N)-MD55 : MA4091(N)-LD56 : MA4110-LD100,150-152,352: 1SS133D200 : MA4051(N)-MQ200Q202J1X16-2/2D371D351Q370D100Q150,200,202UN2212 orKRC103SKRC107SDTC124EK or:Q151,260,353,371UN2214 orDTC114YK or:HD1S3MM1S1S2ILLUMINATION+B SWILLUMINATION+B DRIVER+B SWMOTORPOWER ICP-CON.SWP-CON.PROTECTION SWQ352P-CON.PROTECTIONINHIBIT SWP. O N5V AVRSYSTEM MI-COMRESETSVR DISCHARGE SWMUTELOGICPANEL 5VSWCOM+BAVRE-VOL. &N.C. MPXFM+BSWAM+BSWAM+BSWFRONT-ENDELECTRICVOLUMEMUTE SW+B B LINEGND LINESIGNAL LINEBUBUBUBU BU BUBUBUBUBUBUBUBUBUBUBUBUBUBUBUBUBUBU+5V+5V+5VP5V+5V+5V+5V+5V+5V+B+B+B+B+B+B+B+B+B+B+B+B+B+B+B+B+B+B+B+B+B+B +B+BP5VP5V+5V+5V+5VP5V+5V+5V+5VP5V+5V+5VP5VP5VP5V+5V+5V+5VL8 4.7uH410.01C3210.01C202R129 22KAM+B1923202122AUDIO OUTSDS-METERIF1+B141718VDD 5VIF2+B1516SDASCLDIG GND10111213OSC GNDVTPLL+BIFC OUT789OSC GNDOSC GNDOSC GNDFM ANT3456AM ANTOSC GNDFM+B12RF GND16 15 14 13 12 11 10 98765 432 1FL+ RL+FL- RL- FR-RR- FR+RR+P-ANT P-CONACCB.UGND19231721937 517 232119L1140uH3300u16C50+654321T.MUTEGNDMOT GNDMOT +BPACK INGND10KR2611KR26043KR570.01C5247KR5533KR5210KR544.7KR370R3511KR3523.3u25C350+22KC3510.1u50C352+R3530.0684.7KR160.22u50C180.22u50C174.7KR150.22u50C154.7KR130.22u50C16R14 4.7K100u10C159+C16010u16R152 1KR151 4.7K R153 91K430180KC162 1u50+R157 100R158 33KR155R156222324250.01C15147u10C150+L3 4.7uH0.1C5064.7KR1500.1C1550.015C153 0.22C1540.033150PC157C1560.220.221u50C152 +24IF1 GNDIF2 GND0.01C200W2000.01C20122KR20322KR2011KR2021KR200R20515098L9 4.7uH6310C206 47u10+12345FWD/REVGNDHEAD RHEAD COMHEAD L0.047C25110KR2511500PC21500PC122KR122KR2121110987654321PANSWL DATASL CLKL CEL DATALu GND PAN5VRESETILL GNDLAMP +