Kenwood-MD2070-md-sm 维修电路原理图.pdf

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1、In compliance with Federal Regulations, following arereproductions of labels on, or inside the product relating tolaser product safety,KENWOOD-Corp. certifies this equipment conforms toDHHS Regulation No.21 CFR 1040.10, Chapter 1,Subchapter J.DANGER : Laser radiation when open and interlockdefeated.

2、AVOID DIRECT EXPOSURE TO BEAM.Illustration is DMF-9020.Refer to parts list on page 29.STEREO MINIDISC RECORDERDMF-9020/9020(S)MD-2070SERVICE MANUAL1998-11/B51-5495-00 (K/K) 2945EDIT/SPACEFADE/DELETEINPUTMONITORREC INPUTSTEREO MINIDISC RECORD ERTIMERPHONESKEYBOARDLEVELMINMAXOFFPLAYRECSEARCHTITLEDISC

3、LOADING MECHANISM24 bit Rec. & Play D.R.I.V.E.014873ENTER/TIME DISPLAYU PDOWNPUSH SETSEARCHJOG DIALREC LEVELREC BALANCEMINLRMAXREC MODE /CHARAC.POWER- O N OFFTEXTRLSYSTEMCONTROLPLAYOUTOPT.COAX.RECIN3 COAX.1 COAX.2 OPT.D I G I T A LL I N EPLAYOUTRECI NRLKnob(K27-2178-04)Knob(K29-6700-03)Knob(K29-6692

4、-04)Front glass(B10-2362-04)Phone jack(E63-0190-05)Metallic cabinet(A01-3449-01)Phono jack(E63-1066-05)Oscillating module(W02-1114-05)AC Power cord *(E30-)Optic receiving module(W02-1181-05)Phono jack(E63-1059-05)Phono jack(E63-0174-05)Miniature phone jack(E11-0188-05)Power cord bushing(J42-0083-05)

5、Knob(K29-6697-04)Color filter(B11-0237-14)Dressing panel assy(A21-3756-03)Knob(K29-6695-14)Knob(K29-3741-04)KENWOOD badge(B43-0302-04)Phono jack(E63-1066-05)DMF-9020(K) INT1,1P( 98.11.26 5:23 PM yW 2RadioFans.CN 收音机爱 好者资料库Caution on condensationCondensation (of dew) may occur inside the unit when th

6、ere is a greatdifference in temperature between this unit and the outside.This unit may not function properly if condensation occurs. In thiscase, leave the unit for a few hours with the power left ON, andrestart the operation after the condensation has dried up.Be specially cautious against condens

7、ation in a follow-ing circumstance:When this unit is carried from a place to another across a largedifference in temperature, when the humidity in the room where thisunit is installed increases, etc.Operation to resetThe microprocessor may fall into malfunction (impossibility to operateerroneous dis

8、play, etc.) when the power cord is unplugged while poweris ON or due to an external factor. In this case, execute the followingprocedure to reset the microprocessor and return it to normal condition.With the POWER key left to ON, unplug the power cordfrom the power outlet then, while holding the eje

9、ct (0)key depressed, plug the power cord again.?Please note that resetting the microprocessor clears the contentsstored in, it returns the microprocessor to the condition when it leftthe factory.Before transporting or moving this unit, carry out thefollowing operations.1. Set the POWER key to ON wit

10、hout loading a Mini Disc.?Check that no disc is present in the unit.2. Wait a few seconds and verify that the display shownappears.3. Set the POWER key to OFF.Note related to transportation and movementN OD I S CDMF-9020/9020(S)/MD-20702CONTENTS/ACCESSORIES/CAUTIONSCONTENTS/ACCESSORIES/CAUTIONS.2CON

11、TROLS .3BLOCK DIAGRAM .5CIRCUIT DESCRIPTION.6PC BOARD . 9SCHEMATIC DIAGRAM . 13EXPLODED VIEW .27PARTS LIST.29SPECIFICATIONS .Back coverCONTENTSRemote control unit (1)RC-M0905 (A70-1255-05)Battery cover (A09-1106-08)Batteries (2)Audio (E30-0505-05)(E30-2733-05)(B19-1529-05)cord (2)System control cord

12、 (1)Optical fiber cable (1)CautionsAccessoriesDMF-9020(K) INT1,1P( 98.11.26 5:24 PM yW 3RadioFans.CN 收音机爱 好者资料库DMF-9020/9020(S)/MD-20703CONTROLSDescription of main unit keys1POWER key: Press to turn the unit ON and OFF.: The unit may enter the standby mode when the POWER keyis pressed to turn it ON.

13、 This is because the unit holds thememory that it has been put to the standby mode by theremote control unit in the last operation.2Remote control sensor3EDIT/SPACE keyEDIT: Press to switch the editing mode ON/OFF.SPACE: Press to insert a blank space character during the title inputoperation.4TITLE

14、INPUT key : Press to switch the title input mode ON/OFF.5TITLE SEARCH key: Press to switch the title search mode ON/OFF.: During title editing, press to switch the title change inputmode between the “overwrite mode” and “insert mode”.6JOG DIALSkip down (4)/ Skip up(?) knob: During playback, rotate t

15、o skip tracks.: Before starting recording in record mode, rotate to select therecording setting adjustment mode.: During title search, rotate to select a track number.: During title input, rotate to select a track number or acharacter.: During editing, rotate to select the editing mode or a tracknum

16、ber.PUSH SET knob: For use in setting the editing result and input title in memory.: When pressed in the recording pause mode, the MEMORYREC function is set and recording starts from the soundapproximately 6 seconds before the current sound.7REC MODE/CHARAC. (Character) keyREC MODE: Press to switch

17、the recording setting adjustment modes(record modes) ON/OFF.CHARAC.: Press to select a character group during the title inputoperation.8ENTER/TIME DISPLAY key ENTER: For use in executing the editing and title input operations.TIME DISPLAY: Press to switch the time and title display.9REC LEVEL knob:

18、Rotate to adjust the analog recording level.0REC BALANCE knob: Rotate to adjust the analog recording balance.!Keyboard connector: Connect an IBM PC compatible keyboard (optional) here.PHONES jack: Connect stereo headphones (optional) here.#PHONES LEVEL knob: Rotate to adjust the volume of the headph

19、ones.$TIMER switch: This switch is used in timer playback and timer recording.%REC INPUT key: Press to switch the recording input line between digital(optical/coaxial), analog and monaural.MONITOR key: Press to monitor the sound being input from the sourcewhile the unit is in stop mode.&FADE/DELETE

20、keyFADE: Press to switch the fade mode ON/OFF.DELETE: During title editing, press to delete a character. During trackediting, press to delete a track.*Mini Disc insertion slot: When a Mini Disc is inserted while the unit is in the standbymode, it is turned ON automatically.(Eject (0) key: Press to e

21、ject the Mini Disc.)Manual search down (1) key: This key also functions as the fast reverse key duringplayback.: During an editing mode, press to move the title inputcursor or to scroll the track title display to the left.?Manual search up (?) key: This key also functions as the fast forward key dur

22、ingplayback.: During an editing mode, press to move the title inputcursor or to scroll the track title display to the right.?Pause (8) key: Press to let playback or recording pause temporarily.?Stop (7) key: Press to stop playback or recording.?Play (3) key: Press to start playback.?Record (?) key:

23、Press to start recording.In stop mode: When the ? key is pressed while a recordable disc is presentin the unit, it enters record-pause mode.(It enters record-pause mode at the position immediatelyafter the last existing track.)In record-pause mode: When the ? key is pressed, the SOUND SYNCHRO RECsta

24、ndby mode is set.: In the SOUND SYNCHRO REC standby mode, the setfunctions in the same way as in the normal recording pausemode.Display / Main unitEDIT/SPACEFADE/DELETEINPUTMONITORREC INPUTSTEREO MINIDISC RECORD ERTIMERPHONESKEYBOARDLEVELMINMAXOFFPLAYRECSEARCHTITLEDISC LOADING MECHANISM24 bit Rec. &

25、 Play D.R.I.V.E.01?4?8?73ENTER/TIME DISPLAYU PDOWNPUSH SETSEARCHJOG DIALREC LEVELREC BALANCEMINLRMAXREC MODE /CHARAC. #$ % &*() ?63 47 809125INREPEATFADEOVEROUTOVER (-dB)(-dB)MONOMANUALA . PAUSERLREMAINTOTALSINGLECOPY?TITLE? 9127513403021180151812936403027240SEARCHPGMMONITORANALOG32kHz21348kHz44.1kH

26、zDIGITAL1521!POWER- O N ? OFFDisplayTITLE and SEARCH indicatorsMONO indicatorPGM (Program) indicatorCOPY indicatorFADE, IN, OUT and peak level indicatorsANALOG input indicatorDIGITAL input 1/2/3 indicatorsREPEAT indicatorSINGLE, TOTAL andREMAIN indicatorsCharacter informationdisplayA. PAUSE indicato

27、rMANUAL indicatorMONITOR indicatorOperation indicators?REC indicator8 Pause indicator3 Play indicatorSumpling frequencyindicatorsDMF-9020(K) INT1,1P( 98.11.26 5:24 PM yW 6DMF-9020/9020(S)/MD-20704CONTROLS2Character editing keysTIME DISPLAY key: Press to switch the time and title display.CHARA. (Char

28、acter)/ P.MODE (PlayMode) keyCHARA.: Press to select a character group dur-ing the title input operation.P.MODE: Press to initiate the program mode.DELETE / CLEAR keyDELETE: During title input, press to delete acharacter.CLEAR: During editing, press to clear a selectedtrack number.: In program mode,

29、 press to clear theprogram.SPACE / CHECK keySPACE: During title input, press to insert a blankspace character.CHECK: In program mode, press to check theprogram contents.7EJECT (0) key8Editing mode keysEDIT CANCEL key: Press to cancel the editing operation.TITLE INPUT key: Press to switch the title i

30、nput mode ON/OFF.TITLE SEARCH key: Press to switch the title search modeON/OFF.: During title editing, press to switch thetitle change input mode between the“overwrite mode” and “insert mode”.SET key: This key is used in the title assignment orediting operations.: When pressed in the recording pause

31、mode, the MEMORY REC function is setand recording starts from the sound ap-proximately 6 seconds before the cur-rent sound.ENTER key: Press to execute editing or enter theinput title in memory.EDIT key: Press to switch the editing mode ON/OFF.Remote control unitThe remote control unit incorporates t

32、he basic operation keys as well as a variety of applied operation keys so that it can beused in a wide range of purposes.The keys on the remote control unit with the same names as on the main unit have the same function as the keyson the main unit.Model: RC-M0905Infrared ray system3MONITOR key: Pres

33、s to monitor the sound being inputfrom the source while the unit is in stopmode.METER key: Press to switch the level meter displaycontents.RANDOM key: Press to initiate the random play mode.REPEAT key: Press to switch the repeat modes forrepeat playback.1ON/STANDBY key: Press to turn the unit betwee

34、n ON andSTANDBY ( /) modes.5Recording-related keysREC MODE key: Press to switch the recording setting ad-justment modes ON/OFF.AUTO/MANU. key: Selects whether the track numbers areto be marked automatically during re-cording (AUTO) or to be marked manu-ally after it (MANUAL).AUTO PAUSE key: When thi

35、s key is pressed, the pausemode is initiated automatically at thepoint where the track number changesduring playback.: When pressed in the recording or record-ing standby mode, the AUTO REC PAUSEmode is turned on.REC INPUT key: Press to switch the recording input linebetween digital (optical/coaxial

36、), analogand monaural.EDIT CANCELMONITOR?0REC MODESET1GHI4PRS7+100METERAUTO/MANU.INPUTABCENTER2JKL5TUV8QZ0RANDOMAUTO PAUSESEARCHDEFEDIT3MNO6WXY9+10REPEAT8REC INPUTCHARA.DELETESPACETITLE?/CUR.LCUR.R/?TIMEDISPLAYPOWERREMOTE CONTROL UNITRC-M09054?7CLEARCHECKP.MODE7812345694Basic operation keys3: Play k

37、ey4 , ?: Skip down/up keys?: Record key7: Stop key8: Pause key6CURSOR / 1 , ? shuttleCURSOR: During title input, rotate to move thecursor.1 , ?: Use this during playback for forward andreverse search.9Numeric keys0-9: Press when selecting a track numberdirectly.+10: Press when selecting a track numb

38、er 10or more.+100: Press when selecting a track number100 or more.: These keys are also used to select acharacter or symbol during title editing.DMF-9020(K) INT1,1P( 98.11.26 5:24 PM yW 7DMF-9020/9020(S)/MD-20705BLOCK DIAGRAMRF,TE,FE,SECONT,BUSAPC REFI,J,A,B,C,D,E,FSPINDLEFEEDFCS,TRK,SPIN,SLED PWMAU

39、DIOSYSTEMACTRKFCS-VFL512fs256fsMECHA: MDM-04 (X33-1100-00)(X25-617X-XX)(X00)(X14-4380-00)MAIN (MECHA.)u-COMUPD784215GF533256K SRAMIC31POWERTRANSFORMERFILTERLINEAVRAVRAVRAVRANALOG 5VDIGITAL HEAD MOTOR+5VBACK-UPACIRCDSPSERVOATRACMEMO. CONT(CXD2652AR)(CXA2523AR)RF AMPIC1SERVO(BH6511FS)MOTORDRIVERIC2IC8

40、MMMPLAY POS. SWDRAMIC7PICKUPKMS-260AFLED1FL DOT MATRIXDRIVERIC1KEYMATRIXTIMER SWIC2JOGREC SWREFRECT SWPROTECT SWSTART LIMIT SWDISC IN SWBUFFERIC37REG.+3.3VDIGITAL+5V5.0VLOADING MOTORFEEDMOTORQ7LASER DRIVE APCDISCMOTORDISCIC35MOTORDRIVER PHONESOUTINLINEOPT.COAX.OPT.KEYBOARDRECINOUTPLAYTEMP. DET.ACu-C

41、OM VDDu-COM +5V33VFL ACDIGITALIC5HEADRECORDINGCONTROLREMOTE3.3VE PROM2HEAD DRIVER3.3V5.0V12V3.3V4Mx1SENSOR24bit RESOLUTIOND/A CONVERTERDIGITALDIGITAL24bitOSCANALOGIC11 (2/2)MUTEQ16-19IC22 (1/2)IC21 (1/3)IC21 (2/3)IC10IC6IC39 (2/2)FIP12XM1GAA1S25S3IC34IC39 (1/2)IC7IC13,14J1A1A2J7D1Q42,44Q11Q7,8Q13IC2

42、4IC25IC15SRAM +5VSHUNTOUTINANALOG2V/0.3K0.5V/22K15 21dBm0.5Vp-p/75COAX.DIGITAL (IN/OUT)OPT.5.0VIC383.3VD.R.I.V.E.KAN06SM5844AFSAMPLINGCONVERTERRATEDIGITALX122.5MHzIC26RECPLAY(ANALOG)IC10 (2/2),A/D CONV.(CS5360)IC820bitIC10 (1/2),IC11 (1/2)DATADEMOD.DET.SUBCODE(LC8904Q)RECEIVERDIGITALINTERFACEIC21 (3

43、/3)IC22 (2/2)DIGITAL132DIGITALL1S1D31,32NON REG.(LC89170M)DECODERCD TEXTIC27CD TEXT)SUB u-COM(TITLER andIC28256K SRAMIC29SYSTEMCONTROLSL16J5CONTROLSYSTEM(LC75710NE)VR2MUTEQ7,8DIGITALANALOGIC23I/OEXP.IC32IC36COAX.COAX.D11REC LEVELBALANCELOADINGVR1DMF-9020(K) INT1,1P( 98.11.26 5:24 PM yW 10DMF-9020/90

44、20(S)/MD-20706CIRCUIT DESCRIPTIONNo.NameI/ODescription1,2-ON.C.H; DIGITAL 15RDOSRAM read strobe6WROSRAM write strobe7CSOSRAM CSL; SRAM enable8ASTBOSRAM address strobe9Vdd-Power supply (Microprocessor)10POWEROPower terminalH; Power ON11MUTEOMute control outputL; Mute ON13SCHNGOE2PROM data IN/OUT chan

45、ge-overH; SDA output14SBUSYI/O16 serial busy15SDATAI/O16 serial data16SCLOE2PROM clock17SDAI/OE2PROM data18LDONOLaser ON / OFF control portH; LD ON19RMSOPick RMSH; ON20XLATOSystem IC latch21SENSISystem IC sens22Vpp-GND23PROTECTIDetection port of protect switchL; Protect ON24REFLECTIDetection port of

46、 reflect switchH; Low reflect25DISCINIDetection of disc input switchL; Disc out SW ON26STTLMTIDetection port of limit switchL; Start limit SW ON27PHOTSWIDetection of mechanism play positionL; Photo sensor ON28REC SWIInput port of detection from REC position switchL; REC SW ON29LOADINOOutput port of

47、loading motor control signalL; Loading OUT30LOADOUTOOutput port of loading motor control signalL; Loading IN31MNT0IFOK signal from CXD2652AR (IC2)L; Focus ON32MNT2IInput port of monitor 2 from CXD2652AR (IC2)33XRSTOOutput port of reset signal to CXD2652AR (IC2)34TXOOutput port of recording permitted

48、 signal35RECPOLaser power control to CXD2652AR (IC2)36MNT3IInput port of monitor 3 from CXD2652AR (IC2)37Vdd-Power supply (Microprocessor)-41OPENONo used42GNDINo used43RESETIMicroprocessor hard reset44REMIRemocon signal input terminal45XINTIInput port of interrupted status from CXD2652AR (IC2)46CEIM

49、icroprocessor chip enableH; Enable / L; disable47SQSYIInput port of sub code Q from CXD2652AR (IC2)48DQSYIU-bit of digital IN / SUB Q sync input of CD format from CXD2652AR (IC2)50MNT1IInput port of track jump detection from CXD2652AR (IC2)51Vdd-Microprocessor power supply (+5V)52AVref 0-A/D referen

50、ce voltage (Connect Vdd)5356KR0KR3IKey return (KR0KR3)57TMSWITimer switch input 0.0V OFF1.25V PLAY3.7V REC5.0V58INISW1IDetection selector59BACKIBack up voltage detection (Less than 2.2V : NG)61GND-GND62BACK ONOBack up charge controlH; Charge ON63ENCAIRotary encoder A64AVref 1-D/A reference voltage (