Kenwood-RXDA-77-Service-Manual电路原理图.pdf

(XD-A55/A75)70%MINI HiFi COMPONENT SYSTEMRXD-A55/A75SERVICE MANUAL©2001-4/B51-5713-00 (K/K) 1382 Panel ass'y (A60-2091-08)Knob(VOLUME) (K27-2470-08)Dress ring(A21-3957-08)In compliance with Federal Regulations, following are repro-duction of labels on, or inside the porduct relating to laser prod-uct safety.KENWOOD-Crop. certifies this equipment conforms to DHHSRegulations No.21 CFR1040. 10, Chapter 1, subchapter J.DANGER : Laser radiation when open and interlock defeated. AVOID DIRECT EXPOSURE TO BEAM.*Refer to parts list on page 33. Panel(CD) (A60-2090-08)Front glass *(B10-)RXD-A55/A752CONTENTS / ACCESSORIESCONTENTS / ACCESSORIES.2EXTERNAL VIEW.3DISASSEMBLY FOR REPAIR.4BLOCK DIAGRAM.9CIRCUIT DESCRIPTION.11ADJUSTMENT.14PC BOARD.16SCHEMATIC DIAGRAM.23EXPLODED VIEW.31PARTS LIST.33SPECIFICATIONS.37ContentsFM Antenna (1)(T90-0883-08)AM Loop Antenna (1)(T90-0879-08)Remote Control (1)(A70-1531-08)“AA“ size battery (UM/SUM-3, R6, HP-7 or similar)(2)AccessoriesSYSTEM CONFIGURATIONCautionsSYSTEMMAIN UNITDESTINATIONSPEAKERXD-A55RXD-A55KPLS-N50SXD-A75RXD-A75KPLS-N70SCLASS1LASER PRODUCTThe marking this product has beenclassified as Class 1. It means that thereis no danger of hazardous radiatioutside the product.RXD-A55/A753EXTERNAL VIEWANTENNAFM75AM LOOPRSPEAKERS+-RL-VIDEO/AUXLPin jack (E63-1219-08) Pin ass'y(E40-8933-08)Cabinet(TOP) (A02-3014-08)Lock terminal board(E70-0144-08)AC power cord bushing (J42-0351-08)AC power cord (E30-7222-08)FM Antenna(E70-0145-08)Caution on DisassemblyFollow the below-mentioned notes when disassemblingthe unit and reassembling it, to keep it safe and ensureexcellent performance:1. Take cassette tape and compact disc out of the unit.2. Be sure to remove the power supply plug from the walloutlet before starting to disassemble the unit.3. Take off nylon bands or wire holders where they need beremoved when disassembling the unit. After servicingthe unit, be sure to rearrange the leads where they werebefore disassembling.4. Take suffcient care on static electricity of integratedcircuits and other circuits when servicing.Figure 7-2Figure 7-31Top Cabinet1.Screw.(A1)x47-12Side Panel1.Screw.(B1)x87-1(Left/right)3CD Player Unit/1. Turn on the power supply,7-2CD Tray Coveropen the disc tray, take out the CD cover, and close. (Note 1)2.Screw.(C1)x13.Hook.(C2)x34.Hook.(C3)x25. Socket.(C4) x24RearPanel1.Screw.(D1)x97-25MainPWB1.Screw.(E1)x17-22. Socket.(E2) x38-23.FlatCable.(E3)x14.TipWire.(E4)x16Power Supply PWB1.Screw.(F1)x28-22. Socket.(F2) x13.FlatWire.(F3)x18-37FrontPanel1.Screw.(G1)x38-28Display PWB1. Screw.(H1) x98-32. Socket.(H2) x19Tape Mechanism1. Open the cassette holder.8-32. Screw. (J1) x510Headphones PWB1.Screw.(K1)x18-311Turntable1. Hook.(L1) x28-42.Cover.(L2)x112Disc Tray1. Turn fully the lock lever in the7-3arrow direction.2.While holding the lock lever,rotate8-1the cam gear until the cam gearrib engages with the clamp lever.3. Push the slide holder backward to8-5engage the claw with the grooveand remove it in the directionof the arrow.(M1) x613CDServoPWB1.Screw.(N1)x18-6(Note 2)2.Hook.(N2)x23. Socket.(N3) x414CD Mechanism1.Hook.(P1)x29-12.Hook.(P2)x315Loading Motor PWB1.Hook.(Q1)x59-1STEPREMOVALPROCEDUREFIGUREFigure 7-1(B1)x4ø3x10mm(B1)x2ø3x10mmRearPanel(B1)x2ø3x10mmSide Panel(Right)Side Panel(Left)(A1)x2ø3x12mm(A1)x2ø3x12mmTop Cabinet(E1)x1ø3x10mm(C3)x1(D1)x2ø3x10mm(C1)x1ø3x10mm(D1)x7ø3x10mmCD PlayerUnitDC Tray CoverRearPanelPull(C3) x1(C4)x2(C2) x3112Main PWBCD ServoPWBNote 1:How to open the changer manually. (Fig. 7-3)1. In this state, turn fully the lock lever in the arrow directionthrough the hole on the loading chassis bottom.2. While holding the lock lever, rotate the cam gear anticlockwiseuntil the cam gear rib engages with the clamp lever.(Fig. 8-1)3. After that, push forward the CD slide holder.Note 2:1. After removing the connector for the optical pickup from theconnector, wrap the conductive aluminium foil around thefront end of the connector so as to protect the optical pickupfrom electrostatic damage.Note 3:1. Be careful not to break the claw of the CD mechanism.2. When fining back the cam gear assembly, let it lock by frontmovement.LOCK LEVERRXD-A55/A754DISASSEMBLY FOR REPAIRRXD-A55/A755DISASSEMBLY FOR REPAIRFigure 8-1Figure 8-2Figure 8-3Figure 8-4Figure 8-5Figure 8-6CLAMP LEVERCAM GEAR RIB(F1)x1ø3x6mm(G1)x3ø3x10mm(F1)x1ø3x10mm(F2)x1(E3)x1(E4)x1(E2)x2Main PWB(E2)x1PowerSupplyPWBPowerSupplyPWB(H1)x9ø3x10mm(H2)x1(J1)x5ø3x10mm(K1)x1ø3x10mm(F3)x1Display PWBHeadphonesPWBOpenCassetteHolderTapeMechanismTurntableDisc Tray(L2) x1CD Player Unit(L1) x2132(M1) x3(M1) x3(N3) x2(N2) x2(N3) x2CD ServoPWBCD PlayerBase(N1)x1ø3x8mmRXD-A55/A756DISASSEMBLY FOR REPAIRFigure 9-1(P2) x3(P1) x1(Q1) x5(P1) x1LoadingMotorPWBCDMechanismRXD-A55/A757DISASSEMBLY FOR REPAIRREMOVING AND REINSTALLING THE MAIN PARTSTAPE MECHANISM SECTIONPerform steps 1 to 7 and 9 of the disassembly method toremove the tape mechanism.How to remove the record/playback and eraseheads (TAPE 2) (See Fig. 10-1)1. When you remove the screw (A1) x 2 pcs., the recording/playback head and three-dimensional head of the erasinghead can be removesd.How to remove the playback head (TAPE 1)(See Fig. 10-2)1. When you remove the screw (B1) x 2 pcs., the playbackhead.How to remove the pinch roller (TAPE 1/2)(See Fig. 10-3)1. Carefully push the inside claw to remove it. The pinch rollerpawl in the direction of the arrow , and remove the pinchroller (C1) upwards.Note:When installing the pinch roller, pay attention to the springmounting position.How to remove the belt (TAPE 1) (See Fig. 10-4)1. Remove the main belt (D1) x 1 pc., from the motor side.2. Remove the FF/REW belt (D2) x 1 pc.How to remove the belt (TAPE 2) (See Fig. 10-4)1. Remove the main belt (E1) x 1 pc., from the motor side.2. Remove the FF/REW belt (E2) x 1 pc.How to remove the motor (See Fig. 10-5)1. Remove the screws (F1) x 2 pcs., to remove the motor.Figure 10-1Figure 10-2Figure 10-3Figure 10-4Figure 10-5TAPE2TAPE1Main Belt(D1)x1TAPE2Main Belt(E1)x1TAPE1Main BeltFF/REWBelt(E2)x1FF/REWBelt(D2)x1MotorMotor(A1)x2Ø2x9mmTAPE2Record/PlaybackHeadErase Head(B1)x2Ø2x9mmTAPE1PlaybackHeadPinch Roller(C1)x1STEP1STEP2(F1) x2Ø2.6x5mmMotorRXD-A55/A758DISASSEMBLY FOR REPAIRHow to remove the pickup (See Fig. 11-2)1. Remove the stop washer (B1) x 1 pc., to remove the gear(B2).2. Remove the screws (B3) x 2 pcs., to remove the shaft (B4).3. Remove the pickup.Figure 11-2CD MECHANISM SECTIONPerform steps 1, 2, 3, 11 and 14 of the disassembly methodto remove the CD mechanism.How to remove the loading motor(See Fig. 11-1)1. Bend the hooks (A1) x 5 pcs., to remove the loading motor.Figure 11-1NoteAfter removing the connector for the optical pickup from theconnector wrap the conductive aluminium foil around the frontend of connector so as to protect the optical pickup fromelectrostatic damage.(A1)x2(A1)x1Loading MoterCD Base(A1)x2(B3) x2 ø2.6 x6mmShaft(B4) x1Stop Washer(B1) x1Gear(B2) x1CD MechanismPickupRXD-A55/A759BLOCK DIAGRAM3 4 51 32T.F1238169723247182115141216841 2 95 17 13AM MIXAM IFGND VCCFM DETVCOMO/STLRAM OSC INAM OSC OUT FM/AM OUTAM RF INSTEREOMPXIN FM/AM107 92120 1MO/STFM/AM111522 1617VDO3 4 5 6OSC4.5MHzX352+B4CEDICL DO1329107161513121411RLRLRLRL173+B4FM OSCAM IN FM INVTFM OSCFMFM+B214RL818AUXTAPECDTUNERL R23+B4RL242346916T1/T2REC1345718VCC1+5V+B3+B32314122120P.BH/N17815 19NOR/ HIGH T1/T2+B4LRLR10L NFR NFALCREFR RECR NFL RECPOP REDUCER(T2)L NFR(T1)L(T2)L(T1)+B4+B4REC7418-B2+B45VH+VH-VL-VL+1418RL678,910,111-B1+B1L-OUTR-OUTSP.DET.12-14 25-3615-244-111,238,39,50104-6 7-91 221565859 57 55 54 4950 48 47 46 43 4267-787980-8990-9293-1005253 51 45 44 41 40383936372533-31343511 16131217-20+B7+B7 +B7+B7+B7VDDVLOADRESET VDO22 23 24CE CL DODIVDDAVDO+B6BIAST1/T2REC123+B7+B3+B6R-CHL-CH+B2-B2+B3M10V+B4A10VVF2+B463Hz 307-B241810Hz 1K2928-VFVF1+B6+5V+B5CD+BC801+B7T1/T2P.BPOWER AMP.IC901Q302CNP301AMFMBF301B.P.FFM FRONT ENDTA7358APIC301FM RFL312 T301FM OSCT302FM IF CF303COVERAGETRACKINGAM AM BANDT303 T306OSC BUFFCF352T351CF351IC302FM IF DET./FM MPX./AM IF LA1832SX351456kHzZD351PLL(TUNER)LC72131IC303Q360CNS11FROM CD SECTIONCNP1LC75341IC601AUDIO PROCESSORJK601VIDEO INMIC101Q703Q704Q70554PINIC700IC70056PIN53PINIC70055PINIC700MOTORDRIVERTAPE MECHANISMASSEMBLYSOLM1,SOLM2SOLENOIDMM1MOTORTAPESWM2T2 PLAYR.PLAYSWM4SWM1T1 PLAYSWM3F.PLAYAN7345K/PLAYBACK AMP.PLAYBACK AND RECORDRchLchRchLchTAPE 1TAPE2PB HEADREC/PB HEADSWITCHINGQ103-106SWITCHINGQ107,108AC BIASQ111Q109Q126Q110SWITCHINGQ121,122MUTINGSWITCHINGERASEHEADL104Q128BIAS OSCSWITCHINGQ124BIASAM IFQ862,863 IC860KIA4558POPE AMP.-2ODBATTSYSTEMMUTEQ603,604 Q605,606Q864,865Q901-904FL701DISPLAYIC700(1/2)SYSTEMUPD 780206Q710-712Q701-703MICROCOMPUTERQ700RESETXL7014.1943MHzP-INJOG701JOGRX701SENSORREMOCONKEYTO CDSECTIONJK670HEADPHONESMM901FAN MOTORQ907DRIVERQ905RL901SO901TERMINALSPEAKERD809T801TRANSFORMERF8045A/125VF8055A/125VD810D811-814Q803Q850F806CONSTANTVOLTAGE2A/125VKIA7810APREGULATORVOLTAGEQ851 VOLTAGECONSTANTZD8512A/125VF807KIA4558PMICROCOMPUTERIC700(2/2)OPEAMP.IC561,562SYSTEMUPD 780206ZD801REGULATORKIA7805PVOLTAGEQ852Q802Q801D804D8035A/125VF801D801CONSTANTREGULATORVOLTAGED802-805T802SUB POWERTRANSFORMERRY801AC POWERSUPPLY CORDAC 120V 60HzUNSWITCH 5VSWITCHINGMAIN POWERRXD-A75/A55RXD-A55/A7510BLOCK DIAGRAMFOCUS COILTRACKING COILFD0TD0 SLDOSPDO20 222126XOUTWRQDORESDICECONT519 3728 50 56 75RFVDDVVDDVDDADAVDDFIN1RVDDLVDDXVDDFIN2LDSLDDTIN2TIN1CLKXIN23 405155 57 6949 48 66 65 64 63 616257281874641478010799842434544257071LCHOLVSSRCHORVSSCONT2CONT3CONT4+3.3V+3.3V457618 23 24 40 82VCC1 VCC2VCC4 VCC3122517393842418-142229-351516272621+5V123456AGNDR-CHDGNDL-CH+5V+5VDO465 DICLK321CEWRQDRF897OC. DISC NOCLAMP SWCD RES456123162345146532+5VPICK UP UNITIC1LC78645ECONTROLSERVO/SIGNALXL133.8688MHzQ2CONSTANTVOLTAGEQ1LASERDRIVERIC2M63001FPDRIVERFOCUS/TRACKING/SPIN/SLEDMMM1MOTORSPINDLEMOTORSLEDM2PICKUP INQ3CNP7toSECTIONMAINSECTIONCNP8DISPLAYtoCNP4 CNS4MSW1OPEN/CLOSESW2CLAMPDISCSW3NUMBERLOADINGRXD-A75/A55