Kenwood-MD-2070-Service-Manual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. DIGITAL 15 RD O SRAM read strobe6 WR O SRAM write strobe7 CS O SRAM CS L; SRAM enable8 ASTB O SRAM address strobe9 Vdd - Power supply (Microprocessor)10 POWER O Power terminal H; Power ON11 MUTE O Mute control output L; Mute ON13 SCHNG O E2PROM data IN/OUT change-over H;
4、 SDA output14 SBUSY I/O 16 serial busy15 SDATA I/O 16 serial data16 SCL O E2PROM clock17 SDA I/O E2PROM data18 LDON O Laser ON / OFF control port H; LD ON19 RMS O Pick RMS H; ON20 XLAT O System IC latch21 SENS I System IC sens22 Vpp - GND23 PROTECT I Detection port of protect switch L; Protect ON24
5、REFLECT I Detection port of reflect switch H; Low reflect25 DISCIN I Detection of disc input switch L; Disc out SW ON26 STTLMT I Detection port of limit switch L; Start limit SW ON27 PHOTSW I Detection of mechanism play position L; Photo sensor ON28 REC SW I Input port of detection from REC position
6、 switch L; REC SW ON29 LOADIN O Output port of loading motor control signal L; Loading OUT30 LOADOUT O Output port of loading motor control signal L; Loading IN31 MNT0 I FOK signal from CXD2652AR (IC2) L; Focus ON32 MNT2 I Input port of monitor 2 from CXD2652AR (IC2)33 XRST O Output port of reset si
7、gnal to CXD2652AR (IC2)34 TX O Output port of recording permitted signal35 RECP O Laser power control to CXD2652AR (IC2)36 MNT3 I Input port of monitor 3 from CXD2652AR (IC2)37 Vdd - Power supply (Microprocessor)-41 OPEN O No used42 GND I No used43 RESET I Microprocessor hard reset44 REM I Remocon s
8、ignal input terminal45 XINT I Input port of interrupted status from CXD2652AR (IC2)46 CE I Microprocessor chip enable H; Enable / L; disable47 SQSY I Input port of sub code Q from CXD2652AR (IC2)48 DQSY I U-bit of digital IN / SUB Q sync input of CD format from CXD2652AR (IC2)50 MNT1 I Input port of
9、 track jump detection from CXD2652AR (IC2)51 Vdd - Microprocessor power supply (+5V)52 AVref 0 - A/D reference voltage (Connect Vdd)5356 KR0KR3 I Key return (KR0KR3)57 TMSW I Timer switch input 0.0V OFF1.25V PLAY3.7V REC5.0V58 INISW1 I Detection selector59 BACK I Back up voltage detection (Less than
10、 2.2V : NG)61 GND - GND62 BACK ON O Back up charge control H; Charge ON63 ENCA I Rotary encoder A64 AVref 1 - D/A reference voltage (+5V)65 SRDT I Data for reading input from CXD2652AR (IC2)1-2 Pin description3 EXLAT O Extension port latch4 EXCL O Extension port clock12 INISW2 O Destination selector
11、 H:DMF-9020,MD-207038,39 X2.1 Clock OUT/IN (12.5MHz)40 Vss GND49 DDQSY I DIR.(LC8904Q)SUB-Q thrust60 ENCB I Encoder input B1. Mechanism microprocessor : uPD784215GF533 (X25: IC31)1-1 Microprocessor peripley block diagramE2PROMRF AMPEXLAT:03EXDT:71DINSEL1 DINSEL2 DRON ADRST DARST EMPHAFLDRSTDIGRSTEXC
12、K:04CENA:70CRXD:68CTXD:69SRCLAT:80SRCDT:83SRCCK:82DEMPH:77DSUB2:83DSUB1:78DRDT:73DDQSY:49DLAT:76ENCB:6031:MNT050:MNT1ATRACDRAM(X33) IC7IC31(X33) IC2(X33) IC1(X33) IC6(X25) IC34(X25) IC3336:MNT332:MNT2CXD2652AR66:SWDT20:XLAT67:SCLK65:SRDT33:XRST21:SENS47:SQSY48:DASY45:XINT35:RECP34:TX18:LDONu-COM19:R
13、MSCXA2523AR13:SCHNGDWDT:74DCLK:7517:SDA16:SCLLC75710NETC74HC4094SM5844AFENCODERFL DRIVER(X14) S3(X14) IC1EXPANDER ICAD/DASUB U-COMSRCLC8904QDIR(X25) IC32(X25) IC7,8(X25) IC30(X25) IC25(X25) IC23FLDCE:7223:PROTECT24:REFLECT25:DISCIN(MDM-04)MD MECHA.ENCA:7027:PHOTSW26:STTLMTPOWER:1028:RECSWMUTE:1129:L
14、OADININISW2:12INISW1:5830:LOADOUTTMSW:575:RDKR2:55KR3:567:CS6:WRSRAM8BIT MEMORYLATCHKR1:54KR0:5384:AD091:AD7 BUS 92:A898:A14RESET:43CE:46BACKCHK:85BACKV:59BACKON:62SDATA:15SBUSY:14REM:44DMF-9020(K) INT1,1P( 98.11.26 5:24 PM yW11DMF-9020/9020(S)/MD-20707CIRCUIT DESCRIPTIONPin No. Port Name I/O Descri
15、ption1 SCLK O Text data read clock2 NC O no use3 XMODE O Text data decode LSI reset L : POWER DOWN4-6 NC O no use7 RESET Microprocessor reset8 VDD Microprocessor power supply (+)9 X2 O Oscillation (12MHz)10 X1 I Oscillation (13MHz)11 VSS Microprocessor GND 12,13 NC O no use14 DATA I/O IBM key board
16、I/F data line15 CLOCK_CHG O IBM key board I/F data output line H : CLOCK LINE LOW16-20 NC O no useLC89170M CYBER TITLERMECHA uCOM(X25) J7(X25) IC31(X25) J2(X25) IC27(X25) IC28 (X25) IC30IBM KEYBOARDDQSYDQSY731ADDRESS434240403938373635343332313029ASTB 44RD 23WR 22CS 21/DATAHM62256BLFP-8TTC-74HCT373AF
17、 SRAM BASSCLKSRDTXMODETTXDTRXDMTXDMRXDMENADATACLOCKCLOCK_CHG7838079SUBU-COM515049147715RxDCRxDCTxDDATACLOCKCENATxDSCLKSRDTXMOD2. Sub microprocessor : uPD784035GC836 (X25 : IC28)2-1 Microprocessor peripley block diagram2-2 Pin description1-3 InitializationPOWER = ON (DM-9090,DM-5090)REC INPUT = ANALO
18、GAUTO CUT = OFFAUTO/MANUAL = AUTO= 0 dBPLAY MODE = TRACKREPEAT = OFFTIME DISPLAY = SINGLE(+)LEVEL METER MODE = NORMAL MODEAUTO TNO TIME = 2 secAUTO TNO LEVEL = 0 (-55 dB)REC END WRITE = ONDRIVE = ONPRESET TITLE = PRE1 : PopsPRE2 : RockPRE3 : ClassicPRE4 : JazzPRE5 : DiscoPRE6 : Best HitsPRE7 : Air C
19、heckPRE8 : No.PRE9 : Vol.: Backup item1-5 Key voltage matrixModel INISW INISW DMF-90203.5 (V)MD-2070HIGH1-4 Switch control tableNo. Name I/O Description66 SWDT O Data for writing to CXD2652AR (IC2)67 SCLK O Serial clock to CXD2652AR (IC2)- -H; ONH; ON80 - O No used / pull upH; ON83 ADRST O Data to S
20、M5844AF (IC25) ADC reset8491 AD0AD7 O SRAM address / data (AD0AD7)9299 A8A15 O SRAM address (A8A15)100 Vss - GNDDIGITAL REC LEVELFADE = OFFFADE TIME = 3sec68,69,70 N.C.71 EXDT O Extension port data72 FLDCE O CE to FL driver IC(LC75710NE)73 DRDT I Data for reading form DIR.(LC8904Q)74 DWDT O Data for
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