Kenwood-RXD251-cs-sm 维修电路原理图.pdf

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1、MINI HiFi COMPONENT SYSTEMRXD-251/301/301E/301W/RXD-351/351E/351W/371S/A3SERVICE MANUAL 1998-7/B51-5454-00 (K/K) 3763(XD-251A3)*In compliance with Federal Regulations, following are reproduc-tions of labels on, or inside the product relating to laser productsafety.*Refer to page 2 if you want to kno

2、w system configuration.KENWOOD-Crop. certifies this equipment conforms to DHHSRegulations No. 21 DFR 1040. 10, Chapter 1, Subchapter J.DANGER : Laser radiation when open and interlock defeated.AVOID DIRECT EXPOSURE TO BEAMPanel(CD) *(A60-)Front glass *(A29-)Knob *(K29-)Knob (K29-7512-08)Knob (K29-75

3、19-08)Knob (K29-7518-08)Phone jack(E11-0386-08)Konb(K-29-7516-08)Cassette lid(R) *(A53-)Front glass(R)(B10-3451-08)Front panel *(A60-)Knob *(k29-)Knob(K29-7523-08)Knob(K29-7522-08)Knob(K29-7521-08)Cassette lid(L) *(A53-)Front glass(L)(B10-3450-08)Knob(K29-7515-08)Knob(K29-7511-08)Mic jack(E11-0387-0

4、8)Knob *(K29-)Knob *(K29-)Knob(K29-7513-08)Illust. is RXD-351.* Refer to parts list on page 38.RadioFans.CN 收音机爱 好者资料库FM indoor antenna (1)Europe and U.K.Other countriesAM(T90-0815-08)loop antenna (1)AC(E03-0115-05) plug adaptor (1)Remote(A70-1260-08) control unit (1)Batteries (R6/AA) (2)Use to adap

5、t the plug on the power cordto the shape of the wall outlet.(Accessory only for regions where use isnecessary.)(T90-0801-05): K1P1Y1M1M2M3X1X2X3(T90-0836-05): E1E2E3E4T1T2Q1Q2Operation to resetThe microcomputer may fall into malfunction (impossibility to oper-ate, erroneous display, etc.) when the p

6、ower cord is unpluggedwhile power is ON or due to an external factor. In this case, executethe following procedure to reset the microcomputer and return it tonormal condition.Press the POWER key while holding the Stop (7) key ofthe CD section pressed, to switch off the power, and thenswitch the powe

7、r on again after a few seconds.?Please note that resetting the microcomputer clears the contentsstored in and returns and to condition when it left the factory.SYSTEMMAIN UNITDESTINATIONSPEAKERXD-301RXD-301E3T2X3LS-N301XD-301ERXD-301EE4LS-N301XD-301WRXD-301WQ2LS-N301XD-351RXD-351E1T1LS-N351XD-351RXD

8、-351M1X1Y1LS-N371XD-351ERXD-351EE2LS-N351XD-351WRXD-351WQ1LS-N351XD-A3RXD-A3K1P1LS-N351XD-371SRXD-371SM2LS-N371XD-251RXD-251M3X2LS-N351RXD-251/301/351/371S/A32CONTENTS / ACCESSORIESCONTENTS / ACCESSORIES .2EXTERNAL VIEW.3CONTROLS .4BLOCK DIAGRAM .6CIRCUIT DESCRIPTION.7CD MECHANISM OPERATION DESCRIPT

9、ION .9ADJUSTMENT. 11WIRING DIAGRAM.15PARTS DESCRIPTIONS .16PC BOARD .17SCHEMATIC DIAGRAM .23EXPLODED VIEW .37PARTS LIST.38SPECIFICATIONS .47ContentsAccessoriesSystem configurationCautionsRadioFans.CN 收音机爱 好者资料库RXD-251/301/351/371S/A33EXTERNAL VIEWSlide switch (S62-0083-08)AC power cord *(E30-)Cabine

10、t *(A01-)Phono jack(E63-1073-08)Slide switch(S62-0057-08)Lock terminal board(E70-0108-08)Antenna terminal *(E70-)Illust. is RXD-351.* Refer to parts list on page 38.RXD-251/301/351/371S/A34CONTROLSCD unitDISC 1DISC 2DISC 3076?4DISCSKIP1234 5 67Receiver unitON/STANDBYINPUTSTANDBYMIC 1MIC 2MIC VOLUMEM

11、IN.MAX.TIMER SETCLOCKDISPLAY/DEMOROCKFLATEX.BASSPOPJAZZBANDTUNINGPHONESUPDOWNAUTOPRESETMANUALPRESETAUTO/MONOTIMER890!# $ %&()?*?1Skip (4, ?) keys2DISC SKIP keyUsed to skip discs.3Disc selection keysThe disc number is selected directly and playback starts.4OPEN/CLOSE (0) keyThe disc tray is opened an

12、d closed.5Stop (7) key6Play/pause (6) key7Disc trayThree discs can be stored.8ON/STANDBY () key9INPUT keyKey for input switching.0TIMER keyKey for timer START/STOP switching.!MIC 1/MIC 2 jack (except for some areas)MIC VOLUME knob (except for some areas)#TIMER SET keyUsed for setting the timer ON/OF

13、F time.$CLOCK keyUsed to set the present time.%DISPLAY/DEMO keySwitches the display contents.*Used for demonstration (DEMO) ON/OFF.AUTO/MONO keySwitches the tuning mode.&MANUAL PRESET keyUsed to memorize broadcasting stations in the desired order.*BAND keyPress to switch the receiving band.(TUNING/

14、keysUsed for tuning to broadcasting stations and for time settings.)PHONES terminalFor connection of a headphone (optional).?AUTO PRESET keyUsed for automatic presetting of broadcasting stations.?VOLUME CONTROL knobThis is used for volume adjustment.?Sound selection keysUsed to select the desired so

15、und type.FLAT: For listening without changing the sound.JAZZ: A sound quality curve suitable for jazz.POP: A sound quality curve suitable for popularmusic.ROCK: A sound quality curve suitable for rock-and-roll.EX.BASS: For listening with abundant bass. (Can be usedtogether with other sound selection

16、 keys.)?Display?STANDBY indicator (Except for some areas)RXD-251/301/351/371S/A35CONTROLS RXD-251/301/351/371S/A36BLOCK DIAGRAMCEDICLVREF242320191614125911233,282,291,30+TUNERCDAUXCONTROLSERIESDATAA/BPLAYAMPALCPLAYR/POSCBIAS(Q209,L201)Q205Q203 Q204Q206Q201Q202TAPE OUTTAPEQ405,406REC BUFFERIC402TAPE

17、OUTREC OUTREC INDECK A/B SWQ213+BIC301MIC AMPMIC INQ403,404+3dB AMPPRE SETEQ.PRE AMPIC404EX-BASS412Q411,410Q409,RL501Q413,414MUTESYSTEM714-10dBATTENUATORQ713,POWER AMPIC501+VCC-VCCQ504-506DETECTORIC502SPEAKERPROTECTOR+12V512Q511,MUTEJACKSPEAKERLchHEADPHONESJK502RchJK501+5.5VQ702+7.5V+12VQ701Q704+VCC

18、SWITCHEDtoXFORMER-12VQ709+12V-VCCCN701D702-705D701Q705,706Q703LCD DISPLAYIC601u-COMKEYMATRIXCN09to CD PCBCN401to MAIN PCBRFAMPFILTERRCTUNEAMPMIXIFTCF1BUFFOSCTUNEAMPIFCF2TUNEAM RFAMPRFQ106FM SECTIONQ101PLLIFTAMu-COMIC201L.P.FQ107,1087.2MHzAM SECTIONV.T.AM ANTGNDFM ANTOUTMIXBUFFAMPTUNEAM ANTGNDFM ANTA

19、MPAM RFTUNEOSCANTRFIFTPLLL.P.FQ107,108AMPRFIC201u-COMAMPQ106IFTCF1IFFILTERAM SECTIONAMFM SECTIONCF2OUTRCIC102IC102TUNEFM RFFMOSCQ102GNDIC01 CXA1782BQRF SIGNAL PROCESSING/SERVO AMPPROCESSOR W/DACDIGITAL SIGNALCD POWER DRIVERIC03 BA5936SI/O PORT EXTENSIONIC02 74HC4094IC04 CXD2508QXTL0133.86MHzIC15 NJM

20、4558LOP AMPMMOTORDISCMOTORFEEDMTRACKINGFOCUSTRAY MOTORT/T MOTORSWLIMIT INOUTPUTAUDIOCONTROL SWS01-04RchLchu-COMSUB WOOFERIC602-VCC+VCCPRE AMPJK601USED RXD-301(X3)/RXD-351(M1,X1)/RXD-371S(M2)IC201FM FRONT-ENDFM RF IC101TUNER UNITCD MECHA. UNITTUNER UNITAUDIO UNIT/DISPLAY UNITRXD-351IC401RXD-A3(K1,P1)

21、 TYPE ONLYNo.NameI/ODescriptionActiveHL1CEILC7218, LC75392 CE out2ENABLENo used3DIILC7218, LC75392, 74HC4094 data out4DOOData output to LC72185CLKILC 7218, LC75392, 74HC4094 clock out6DATAOSerial data out to CXD2508Q7SQCOISerial output of SUBQ 80BIT8SQCKOClock output9XLATOLatch output10FOKOFocus OK

22、output11GNDGND12RESETIReset signal input13POWER - DOWNIPower down input14SENSICXD2508Q sens15VSSVss16X1Xtal 6.0MHz17X2Xtal 6.0MHz18VDD1Vdd1922K1K4IKey input (K1K4)23, 24GNDGND25MODE - SW2IModel discrimination (RXD-371S only)26MODE - SW1IModel discrimination27SCORICXD2508Q Sub - code synch detect28CO

23、UNTOTrack number count signal output29REMOTE INIRemote signal input30VR +IVR encoder input A31VR -IVR encoder input B32PIC - UPIPick - up SW33PIC - DOWNIPick - down SW34DISC - COUNTIDisc counter SW35TURNTABLE - SWITurntable SW36TRAY - OPENITray open SW37TRAY - CLOSEITray close SW38N/CNo used39VR - 1

24、OVR step extend out0, 1 stepothers4051N/CNo used5255S1 - S4OSegment out (14)56VDD2Vdd57VSS2Vss5879S5S26OSegment out (526)8082BIAS 31GND8386COM - 03OFL Common 0387FM - STEREOIFM stereo signal inputMonoStereo88SYN RECISynchro start input89VSS3VssRXD-251/301/351/371S/A37CIRCUIT DESCRIPTION1. Microproce

25、ssor : (IC601, LC867224A-5H71)1-1 Pin descriptionPORTSW 1SW 2SW 3SW 4SW 5SW 6SW 7SW 8SW 9SW 10Pin 19PowerInputClockTimerTimerDisplayEQ OffRockJazzPop(K1)SetModeSetPin 20TuningTuningBandAuto/AutoManualEX Bass(K2)UpDownMonoPresetPresetPin 21CDAMS -DiscDisc 1Disc 2Disc 3Open(K3)AMS +SkipClosePin 22CDCD

26、 PlayFF(K4)StopPauseRXD-251/301/351/371S/A38CIRCUIT DESCRIPTIONNo.NameI/ODescriptionActiveHL90VDD3Vdd91POWER - SWOPower SW outOnOff92SYS - MUTOSystem mute outOffOn93TU - MUTOTuner mute outOnOff94MODE - SW - ININo used95FUNCTION - TAPEOFunction tape outTapeOthers96LCD - BACK - LIGHTOLCD back light co

27、ntrolOnOff97N/CNo used98EX - BASSOEX - bass controlOnOff99LATCHNo used100STBO74HC4094 strobePINNAMEI/ODESCRIPTIONACTIVE4MUTEOCXD2508Q Muting (DAC)H : ONL : OFF5CONTROLOCXA1782BQ, CXD2508Q Vdd controlH : OthersL : CD6XRSTOCXD2508Q XRST7T T +OT T/U D Motor (+)11CONTROLOT T Motor speed Control12TRAY -O

28、Tray Motor Control (-)13TRAY +OTray Motor Control (+)14T T -OT T/U D Motor (-)4. All LCD light on mode The all LCD light up when the STOP key and TIMER SET key are pressed simultaneously, while the power is ON. When the ON/STANDBY key is pressed, the all LCD light on mode is canceled.2. Key matrix3.

29、 I/O port extension (CD mecha. unit)IC02 (74HC4094)RXD-251/301/351/371S/A39CD MECHANISM OPERATION DESCRIPTIONROTARY MOTORGEARPULLEYRELAYGEAR ARELAYGEAR BTR LOCKGEARUD-CAMUD REDUCEGEARCHANGEGEARTURN TABLEDISC 2DISC 1DISC 3DISC SWFig.1SW CTRAY MOTORFig.3Fig.223TR GEARSENSOR SW(STOP POSITION OF DISC 3)

30、1. In case of disc 3 (Refer to figure 1 and 2)1 The rotary motor turns counterclockwise by pressing disc 3 key, therefore the turntable turns clockwise and disc 3 is detect-ed by disc number detector switch.2 The turntable stops the position of 3 marked as figure 2 and stop position of disc 3 is det

31、ected by sensor switch.At this time, the position of TR lock gear is as shown figure 1.3 The rotary motor turns clockwise and the relay gear B also turns clockwise.By turning the relay gear B, the arm of relay gear B moves to arrow direction (2 7 7 7) and the TR lock gear will belocked.After that, t

32、he change gear separates from TR lock gear.4 The UD reduce gear turns clockwise by turning the change gear.5 The traverse moves up-side.6 After finished the traverse operation, the disc motor turns and the disc 3 will be played.2. Open/Close operation of traywhile playing the disc. (Refer to figure

33、3)1 The tray motor turns clockwise by pressingopen/close key while playing the disc.2 The change base moves to frontward byturning the TR gear.3 Pushing switch C by change base, the traymotor stops.RXD-251/301/351/371S/A310CD MECHANISM OPERATION DESCRIPTIONHow to replace the pick up. (Refer to figur

34、e 47)1. Remove the screws (1 x 4), top chassis and spring (2 x 2).2. Detach the traverse unit by removing shield (bottom side) and screws (3 x 2).3. Short the short land and remove screws (4 x 4, 5 x 1).4. Remove the rod and replace the pick up.1 x21 x23 x13 x12 x22 x1Fig.4Fig.5BOTTOM VIEW4 x24 x25

35、x1Fig.7Fig.6SHORT LANDTOP VIEWRXD-251/301/351/371S/A3NO.ITEMINPUT SETTINGOUTPUTSETTINGTUNERSETTINGALIGNMENTPOINTSALIGN FORFIG.1.IF(A)98 MHz,1 kHz MOD75 KHz (DEV)60 dBu (ANT INPUT)(B)98MHzT101Maximum output(Minimum distortion2.LOW ENDTRACKING(A)87MHz, 1 kHz MOD75 kHz (DEV)35 dBu ( ANT INPUT)(B)87MHzL

36、102Maximum output3.HI ENDTRACKING(A)108MHz,1 kHz MOD75 kHz (DEV)35 dBu (ANT INPUT)(B)108MHzTC101Maximum output4.VTConnect the DCvoltage meter toTP2.87.5 MHzL103VT=1.0V0.05V108 MHzCheck theVT=7.0V1.0VNO.ITEMINPUT SETTINGOUTPUTSETTINGTUNERSETTINGALIGNMENTPOINTSALIGN FORFIG.1.IF(A)531 kHz or 530 kHz1 k

37、Hz, 30% MOD60 dBu (ANT INPUT)(B)531 kHzor530 kHzT102Maximum output(Minimum distortion) 2.LOW ENDTRACKING(A)531 kHz or 530 kHz1 kHz, 30% MOD30 dBu (ANT INPUT)(B)531 kHzor530 kHzL104Maximum output3.HIGH ENDTRACKING(A)1602 kHz or 1610 kHz1 kHz, 30% MOD30 dBu (ANT INPUT)(B)1602 kHzor1610 kHzTC102Maximum

38、 output4.VTConnect the DCvoltage meter toTP2.531 kHzL105VT=1.2V0.05V1602 kHzCheck theVT=7.3V1.0VNO.ITEMINPUT SETTINGOUTPUTSETTINGTUNERSETTINGALIGNMENTPOINTSALIGN FORFIG.1.IF5.95 MHz1 kHz, 30% MOD60 dBu (ANT INPUT) (D)(B)5.95 MHzT102Maximum output(Minimum distortion) 2.LOW ENDTRACKING5.95 MHz1 kHz, 3

39、0% MOD30 dBu (ANT INPUT)(D)(B)5.95 MHzL201Maximum output3.HIGH ENDTRACKING17.9 MHz1 kHz, 30% MOD30 dBu (ANT INPUT)(D)(B)17.9 MHzTC201Maximum output4.VTConnect the DCvoltage meter toTP2.5.95 MHzL202VT=1.0V0.05V17.9 MHzCheck theVT=8.4V1V11RXD-251/301/351/371S/A3ADJUSTMENTFM SECTION (Except for Europe

40、version)* Europe version no AdjustmentMW SECTIONSW SECTIONRXD-251/301/351/371S/A3FM 75 AMANTENNAEuropeand U.K.OthercountriesAMFM 75 GND(A)(C)(D)AM-SGFM-MPX-SGFM-MPX-SGPOLAR SGDummy antennaOscilloscopeAC voltmeter(B)Distortion meterTO TUNER UNITCN101, pin 9 (Lch)pin 7 (Rch)pin 8 (GND)NO.ITEMINPUT SET

41、TINGOUTPUTSETTINGTUNERSETTINGALIGNMENTPOINTSALIGN FORFIG.1.IF153 kHz1 kHz, 30% MOD60 dBu (ANT INPUT) (D)(B)153 kHzT102Maximum output(Minimum distortion) 2.LOW ENDTRACKING153 kHz1 kHz, 30% MOD30 dBu (ANT INPUT)(D)(B)153 kHzL201Maximum output3.HIGH ENDTRACKING279 kHz1 kHz, 30% MOD30 dBu (ANT INPUT)(D)

42、(B)279 kHzTC201Maximum output4.VTConnect the DCvoltage meter toTP2.153 kHzL202VT=1.0V0.05V279 kHzCheck theVT=5.0V1.0VADJUSTMENT12LW SECTIONINSTRUMENTS CONNECTIONRXD-251/301/351/371S/A3NO.ITEM INPUTSETTINGSOUTPUTSETTINGSCASSETTE TAPEDECK SETTINGSALIGNMENTPOINTALGN FORFIG.Unless otherwise specified :

43、each ; switch should be set as follows : 0dBs = 0.775VBEAT SW : OFFI. Cassette mechanism section (REC/PB head adjustment)1Demagnetizationand cleaningPower OFF,demagnetization,cleaning playREC/PB head,erase head.capstan, pinchrollerDemagnetize the REC/PBhead by head eraser. Cleanthe REC/PB head, eras

44、ehead capstan and pinchroller with a cotton swabimmersed in alcohol.2REC/PB headazimuthMTT-114,TCC-153SCC-172710 kHz, -10dB(A)PLAYAzimuthadjustmentscrewIn a setting wher the outputis maximized, adjust theazimuth adjustment screwso that the Lissajous figureappearing on the oscilloscopescreen comes ne

45、ar to a lineslanted45 Note : The headshould be installed in such amanner that it approaches thetape face.II. PC board adjustment Tape speedMTT-111TCC-100SCC-17273 kHz, -4 dB(A)PLAYSFR201Adjust so that Frequency is3 kHz at the center of thetape. Playback levelTCC-120315 Hz 0dB(A)PLAYApprox. -5dBm ref

46、erence levelRecording levelPut standardtest tape(TCC-120) into B deck.Put standardblank tapeinto A deck.(A)Dubbing andplayback.Approx. -5dBm reference level13ADJUSTMENTCASSETTE DECK SECTIONOscilloscopeFrequency counterAC voltmeterPIN2IC401(A)MAIN UNITINSTRUMENTS CONNECTIONRXD-251/301/351/371S/A314AD

47、JUSTMENTCD MECHA.UNITR07VR01VCIC0148pinRFR07AR06FIG.(a)No.ITEMINPUTSETTINGSOUTPUTSETTINGSALIGNMENTPOINTSALIGNFORPLAYERSETTINGS1LASER POWERApply the sensor sectionof optical power meteron the pickup lens.On the power from0.08 to 0.15 mW,when the diffractiongrating is correctlyaligned with the RFlevel

48、 of 0.6 Vp-p ormore.Press thePLAY/PAUSE key.PickupFOCUS ERRORBIASTest discType 4Connect an oscilloscopeas follows.CH1 : RF (R07A)GND : VC (IC01, 48 pin)FE BIASVR01Optimum eye patternPress thePLAY/PAUSEkey.Note:Type 4 disc : SONY YEDS-18 Test Disc or equivalent.(KTD-08)0.080.15 mWOptical power meter2

49、(a) Laser powerALIGNMENT POINTCD SECTIONRXD-251/301/351/371S/A315WIRING DIAGRAMRXD-351(J,X1,X3,Y1,M1), RXD-A3(K1,P1),RXD-251(X2,M3), RXD-371S(M2)RXD-351E(E2), RXD-301W(Q2), RXD-351W(Q1)RXD-301(E3,T2), RXD-351(E1,T1), RXD-301E(E4),RXD-301E/351ERXD-301W/351WRXD-371SRXD-351RXD-301RXD-A3RXD-251TUNER UNI

50、TTUNER UNITCASSETTE DECKRECORD SWITCHMOTORUNITSWITCH AUNITSWITCH DUNITSWITCH CUNITCD MECHA.UNITCD MECHA.ASSYHEADPHONEMIC MIX UNITAUDIO UNITSUB WOOFERPRE AMPDISPLAY UNITUNITSENSORCDCONTROLUNITUNITUNITRXD-A3 TYPERXD-371S(M2)RXD-351(M1,X1)/RXD-301(X3)/USEDUNITSWITCH BTRANSFORMERPOWERAC CORD UNITRXD-371