Kenwood-KMD-42-Service-Manual电路原理图.pdf

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1、 2000-1 PRINTED IN JAPANB51-7579-00(S) 1474SERVICE MANUALMD RECEIVERKMD-42l This service manual does not include information on the MD mechanism assembly (explodedview, parts list,schematic diagram or mechanism description).For such information, refer to the MD mechanism assembly manual (X92-3390-00

2、, 0-01, X92-3560-00,X92-3580-00 : B51-7461-00).FMEscutcheon(B07-2181-02)Front glass(B10-3116-01)Panel assy(A64-1880-02)SRCDISC+PWROFFKMD-42MENUAUDAMDISC-AUTO CLKAME NAME.SSCAN RDM REP D.SCAN M.RDMMD RECEIVER CDMD-CHANGER CONTROL 45Wx4LOUDATT123456Mounting hardware assy(J21-9491-03)Plastic cabinet as

3、sy(A02-1486-13)Lever(D10-3031-04) x2Screw set(N99-1610-15)Screw set(N99-1632-05)Stay(J54-0606-04)DC cord(E30-4783-05)BLOCK DIAGRAMKMD-422Q25,26A8VUPBACKTUNERandE-VOLMPXCHMDAMFMVDDQUALLEVEL MP INIC2Q21,22 MUTEMUTE DRIVERQ19,20IC8,Q23380mV170mV1200mV 1200mVFM+B AM+BQ27,28TUN5VAUDIO OUTVDD 5VIF1/IF2/PL

4、L+BAM+BFM+BS-METERSDANTS 5.0V A8V BU5VLOADLOE SWLOS SWMDEJECTM STOPM RSTM MUTEMDATAM CLKBU5VR CLKR D ATAQU A LNOISEAFCSDS-METERu-COMIC1IC7,Q33RSTL D ATA SL CLKL D ATA LREMOP ANELQ24BU5VPAN 5V SWPANELIC2PAN 5VRST SW(X13)IC1REMOTECONTROLWITHLCD DRIVER KEY MATRIXLCDSW5VPAN 5VMD SERVOAVRIC6A.8V AVRIC3,Q

5、5A.8V AVRON/OFF SWQ3,4ILLUMI AVRQ7-9P-CON/ANT-CONBACK UPSW5VBU5VQ1,2P-CONQ13-16SP-OUT ACCPROTECTIONTHERMALPOWER ICSVR SW3529mVAMFM547mV1692mVCD-CHMD3529mVPRE OUTIC4MUTESD ASCLPHONEQ18ACC DET.ACC DET.SVRBUDET.DSIQ10Q17BUDET.SDASCLS MUTEMP OUTRSTDATACREQ HCH-CONDATAHREQ CCLKMUTECHL INHL CESERVOAVRON/O

6、FF SWQ6S 5.0VA8VVLCD AVRQ4SW5VBU5VA1SCLSD ACONTENTSBLOCK DIAGRAM . 2COMPONENT DESCRIPTION . 3MICROCOMPUTERS DESCRIPTION . 4ADJUSTMENT . 6PC BOARD . 7SCHEMATIC DIAGRAM . 11EXPLODED VIEW . 17PARTS LIST. 18SPECIFICATIONS . Back coverKMD-423COMPONENT DESCRIPTIONl SWITCH UNIT(X13-9700-11)Ref.No. Componen

7、t Name Application/Function Operation/Condition/CompatibilityIC1 LC75808W LCD driver with key-matrixIC2 RS-171 Remote control light sensorQ1 DTA114EKorUN2111 Key-matrix permission SW Ready on key-matrix, ON when the base goes “Lo”.Q4 2SC2412Kor2SD601A LCD AVRl ELECTRIC UNIT(X25-8450-11)Ref.No. Compo

8、nent Name Application/Function Operation/Condition/CompatibilityIC1 UPD784216GF520 System MI-COM.IC2 TDA7400D E-VOL. & N.C. MPXIC3 M5237ML AVR IC AVR IC is combined with Q5, and it works as the errordetection, the driver.IC4 TDA7386 Power ICIC6 LM2595S-5.0 MD SERVO AVR Output voltage 5.0V fixation.

9、A DC/DC Converter withthe ON/OFF function.IC7 PST9130NR Reset IC “L”:detection voltage below 3.0VIC8 HD74HC27FP Mute logic 3 input NOR gate x3Q1 2SC4081or2SD1819A BU 5V AVR Inverted darlington connectionQ2 2SB1565F(E,F) On during BU applied.Q3 DTA124EUAorUN5112 Audio 8V AVR ON/OFF SW Audio 8V AVR ON

10、/OFF controlQ4 DTC144EKorUN2213orKRC104S Q3 is turned ON when Q4s base goes “Hi”.Q5 2SB1565F(E,F) Audio 8V AVR Output voltage 8.3VQ6 DTC144EKorUN2213orKRC104S MD SERVO AVR ON/OFF SW AVR IC is activated when Q6s base goes “Hi”.Q7 DTC144EUAorUN5213 Illmination AVR AVR output is ON when Q7s base goes “

11、Hi”.Q8 DTA124EUAorUN5112Q9 2SD1760Q10 2SA1036K SW 5V ON when the base goes “Lo”.Q13 2SB1277(Q,R) P-CON SW Q13 is turned ON when Q16s base goes “Hi”.Q16 DTC114YKorUN2214orKRC107SQ14 2SA1037K P-CON protection Protect Q13 by turning ON when P-CON output isgrounded.Q15 DTA124EKorUN2112orKRA103S Prevents

12、 Q14 tuning ON during start-up after powerON.Q17 2SC2412Kor2SD601A BU detection(Momentary ON when the base goes “Hi” during BU applied.power down detection)Q18 2SC2412Kor2SD601A ACC detection ON when the base goes “Hi” during ACC applied.Q19 DTA124EKorUN2112orKRA103S Mute driver for Audio mute SW ON

13、 when the base goes “Lo”.Q20 DTC144EKorUN2213orKRC104S E-VOL. mute SW E-VOL. is muted when the base goes “Hi”.Q21 DTC143TKorUN2216 Audio mute SW Audio pre-outs are muted when the base goes “Hi”.Q22 DTC143TKorUN2216Q23 DTC114YKorUN2214orKRC107S SVR SW POWER IC RESET is activated when the base goes“Hi

14、”.Q24 2SA1576A Panel detection SW ON when the base goes “Lo” during the panel closed.Q25 DTC124EKorUN2212orKRC103S FM+B SW Q26 is turned ON when Q25s base goes “Hi”.Q26 2SB1277(Q,R) ON during FM receptionQ27 DTC124EKorUN2212orKRC103S AM+B SW Q28 is turned ON when Q27s base goes “Hi”.Q28 2SB1277(Q,R)

15、 ON during AM receptionQ33 DTC144EKorUN2213orKRC104S RESET SW System RESET is activated when the panel reset SWis pushed.KMD-424MICROCOMPUTERS DESCRIPTIONl Terminal DescriptionPin No. Pin Name I/O Description Processing Operation1 TYPE 0 I Destination type input terminal 0 Pull down to GND2 TYPE 1 I

16、 Destination type input terminal 1 Pull down to GND3 N.C. O Not used4 N.C. O Not used5 N.C. O Not used6 N.C. O Not used7 N.C. O Not used8 N.C. O Not used9 VDD - VDD connection terminal Connected to BU 5V lines10 STBY O Power IC standby control output “Hi”: POWER ON mode11 SVR O Power IC reset termin

17、al When the momentary power down, after ACC OFFis detected and after POWER OFF, the output goes“Hi” temporarily.12 N.C. O Not used13 P-MUTE O Power IC mute control “Lo”: Mute14 ANT-CON O Antenna control “Hi”: during FM/AM reception15 IC2-SCK O Clock output to the E-VOL. IC16 N.C. O Not used17 P-CON

18、O Power control “Hi”: POWER ON mode except ALL OFF mode18 ACC-DET I ACC detection input “Hi”: ACC OFF, “Lo”: ACC ON19 REMO I Data input from the remote control light sensor20 P-ON O A.8V AVR ON/OFF control terminal “Hi”: POWER ON mode or during MD Loading/Eject21BU-DETI Momentary power down detectio

19、n input “Hi”: When momentary power down detected orBU OFF, “Lo”: BU ON22 TSET - Not used Connected to GND23 IC2-SDA I/O Data input/output with the E-VOL. IC24 MUTE O Mute control output “Hi”: Mute ON, “Lo”: Mute OFF25 SW5 O SW 5V control “Lo”: POWER ON mode or during MD Loading/Eject26 M-CLK I/O Clo

20、ck input/output with the MI-COM. of MD mecha.27 M-DATA I/O Data input/output with the MI-COM. of MD mecha.28 IC3-SDA I/O Data input/output with the F/E(tuner)29 CHCON O Changer control “Lo”: Standby, “Hi”: during the movement30 IC3-SCK O Clock output to the F/E(tuner)31REQ HO Request output to chang

21、ers “Lo”: Request32 ILL-ON O Illumination AVR ON/OFF control terminal “Hi”: POWER ON mode33 DSI O DSI output terminal Not used34 N.C. O Not used35 N.C. O Not used36 MD+B O MD servo +B ON/OFF control terminal “Hi”: MD source is selected or during MD Loading/Eject.37 VDD - VDD connection terminal Conn

22、ected to BU 5V lines38 X2 - Main clock resonator connection terminal39 X1 I Main clock resonator connection terminal40 VSS - Ground connection terminal Connected to GND41 XT2 - Sub clock resonator connection terminal42 XT1 I Sub clock resonator connection terminal43 RESET I Reset input terminal “Lo”

23、: System reset44 N.C. O Not used45 R-CLK I Clock input from RDS decoder Not used(pull down to GND)46 REQ C I Request input from changers “Hi”: Request47 KEY-REQ I Key request terminal “Lo”: Request48 N.C. O Not used49 LOS-SW I MD insertion detection terminal “Lo”: MD insertion detectedSystem -com :

24、UPD784216GF520Pin No. Pin Name I/O Description Processing Operation50 N.C. O Not used51 AVDD - VDD connection terminal Connected to BU 5V lines52 AVREF 0 - VDD connection terminal(A/D converter reference Connected to BU 5V linesvoltage input)53 PHONE I PHONE detection input Not used(pull down to GND

25、)54 N.C. I Not used Connected to GND55 NIOSE I Noise detection input Not used(pull down to GND)56 S-METER I S-meter input from the F/E(tuner)57 N.C. I Not used Connected to GND58 N.C. I Not used Connected to GND59 N.C. I Not used Connected to GND60 M-MUTE I Mute request from the MI-COM. of MD mecha.

26、 “Lo”: Mute requested61 AVSS - Ground connection terminal(A/D, D/A converter) Connected to GND62 N.C. O Not used63 M-RST O Reset output to the MI-COM. of MD mecha. “Lo”: Reset64 AVREF 1 - VDD connection terminal(D/A converter reference Connected to BU 5V linesvoltage input)65 DATA C I Data input fro

27、m changers66 DATA H O Data output to changers67 CH-CLK I/O Clock input/output with changers68 L-DATAL I Data input from the LCD driver IC69 L-DATAS O Data output to the LCD driver IC70 L-CLK O Clock output to the LCD driver IC71 M-STOP O Stop request to the MI-COM. of MD mecha. “Lo”: Stop, “Hi”: dur

28、ing the movement72 BEEP O BEEP sound output73 N.C. O Not used74 N.C. O Not used75 N.C. O Not used76 LOE-SW I MD loading complete detection SW input terminal “Lo”: MD loading completion77 EJECT O MD mecha. Loading/Eject switching output terminal Standby : (EJECT, LOAD)=(Lo, Lo)Eject : (EJECT, LOAD)=(

29、Hi, Lo)78 LOAD O MD mecha. Loading/Eject switching output terminal Loading : (EJECT, LOAD)=(Lo, Hi)Brake : (EJECT, LOAD)=(Hi, Hi)79 L-INH O INH output to the LCD driver IC “Hi”: Active, “Lo”: LCD indication OFF80 L-CE O CE output to the LCD driver IC “Hi”: Active81 PANEL I Panel detaching detection

30、input “Lo”: Panel not detached82 N.C. O Not used83 N.C. O Not used84 QUAL I Quality input from RDS decoder Not used(pull down to GND)85 R-DATA I Data input from RDS decoder Not used(pull down to GND)86 N.C. O Not used87 N.C. O Not used88 SD I SD input from the F/E(tuner) “Hi”: Station detected, “Lo”

31、: Not detected89 N.C. O Not used90 N.C. O Not used91 N.C. O Not used92AFCO Noise detection time constant switching terminal Not used93 N.C. O Not used94 N.C. O Not used95 N.C. O Not used96 AM+B O AM+B control “Hi”: during AM reception97 FM+B O FM+B control “Hi”: during FM reception98 ST TYPE 0 I IC2

32、 stereo data setting terminal “Lo”: Initial value99 ST TYPE 1 I IC2 stereo data setting terminal “Lo”: Initial value100 VSS - Ground connection terminal Connected to GNDKMD-425KMD-426MICROCOMPUTERS DESCRIPTION ADJUSTMENTTEST MODE1. To enter test modeWhile holding the “FM” key and preset “6” key, res

33、et the unit.All indication segments are ON at the beginning of test mode.2. To release test modeSimply reset the unit.(NOTE) The test mode is not canceled by ACC OFF, powerOFF, momentary power down.3. MD receiver test mode specificationPressing the “Track Up” key jumps between tracks in thefollowing

34、 order.No.7 No.2 No.13 No.23 No.30 No.34 No.7(Same as the beginning)Pressing the “Track Down” key jumps to the previous trackto the being played.Pressing the preset “1” key jumps to No.28 track. Againpressing the preset “1” key jumps to No.22 track.4. Audio adjustmentThe volume is set to -10dB (whic

35、h is shown as 30).Loudness is OFF. CRSC becomes OFF regardless of thefunctional excuse, too.The BASS / TREBLE and BALANCE / FADER controls canbe set to the full boost / full cut and full front / full rear and fullright / full left respectively by pressing the “Track Up” / “TrackDown” keys.Sound coor

36、dination(Kex / ec4 / dB) doesnt appear for theAudio mode feed.Pin No. Pin Name I/O Description Processing Operation50 N.C. O Not used51 AVDD - VDD connection terminal Connected to BU 5V lines52 AVREF 0 - VDD connection terminal(A/D converter reference Connected to BU 5V linesvoltage input)53 PHONE I

37、 PHONE detection input Not used(pull down to GND)54 N.C. I Not used Connected to GND55 NIOSE I Noise detection input Not used(pull down to GND)56 S-METER I S-meter input from the F/E(tuner)57 N.C. I Not used Connected to GND58 N.C. I Not used Connected to GND59 N.C. I Not used Connected to GND60 M-M

38、UTE I Mute request from the MI-COM. of MD mecha. “Lo”: Mute requested61 AVSS - Ground connection terminal(A/D, D/A converter) Connected to GND62 N.C. O Not used63 M-RST O Reset output to the MI-COM. of MD mecha. “Lo”: Reset64 AVREF 1 - VDD connection terminal(D/A converter reference Connected to BU

39、5V linesvoltage input)65 DATA C I Data input from changers66 DATA H O Data output to changers67 CH-CLK I/O Clock input/output with changers68 L-DATAL I Data input from the LCD driver IC69 L-DATAS O Data output to the LCD driver IC70 L-CLK O Clock output to the LCD driver IC71 M-STOP O Stop request t

40、o the MI-COM. of MD mecha. “Lo”: Stop, “Hi”: during the movement72 BEEP O BEEP sound output73 N.C. O Not used74 N.C. O Not used75 N.C. O Not used76 LOE-SW I MD loading complete detection SW input terminal “Lo”: MD loading completion77 EJECT O MD mecha. Loading/Eject switching output terminal Standby

41、 : (EJECT, LOAD)=(Lo, Lo)Eject : (EJECT, LOAD)=(Hi, Lo)78 LOAD O MD mecha. Loading/Eject switching output terminal Loading : (EJECT, LOAD)=(Lo, Hi)Brake : (EJECT, LOAD)=(Hi, Hi)79 L-INH O INH output to the LCD driver IC “Hi”: Active, “Lo”: LCD indication OFF80 L-CE O CE output to the LCD driver IC “

42、Hi”: Active81 PANEL I Panel detaching detection input “Lo”: Panel not detached82 N.C. O Not used83 N.C. O Not used84 QUAL I Quality input from RDS decoder Not used(pull down to GND)85 R-DATA I Data input from RDS decoder Not used(pull down to GND)86 N.C. O Not used87 N.C. O Not used88 SD I SD input

43、from the F/E(tuner) “Hi”: Station detected, “Lo”: Not detected89 N.C. O Not used90 N.C. O Not used91 N.C. O Not used92AFCO Noise detection time constant switching terminal Not used93 N.C. O Not used94 N.C. O Not used95 N.C. O Not used96 AM+B O AM+B control “Hi”: during AM reception97 FM+B O FM+B con

44、trol “Hi”: during FM reception98 ST TYPE 0 I IC2 stereo data setting terminal “Lo”: Initial value99 ST TYPE 1 I IC2 stereo data setting terminal “Lo”: Initial value100 VSS - Ground connection terminal Connected to GNDKMD-425KMD-426MICROCOMPUTERS DESCRIPTION ADJUSTMENTTEST MODE1. To enter test modeWh

45、ile holding the “FM” key and preset “6” key, reset the unit.All indication segments are ON at the beginning of test mode.2. To release test modeSimply reset the unit.(NOTE) The test mode is not canceled by ACC OFF, powerOFF, momentary power down.3. MD receiver test mode specificationPressing the “Tr

46、ack Up” key jumps between tracks in thefollowing order.No.7 No.2 No.13 No.23 No.30 No.34 No.7(Same as the beginning)Pressing the “Track Down” key jumps to the previous trackto the being played.Pressing the preset “1” key jumps to No.28 track. Againpressing the preset “1” key jumps to No.22 track.4.

47、Audio adjustmentThe volume is set to -10dB (which is shown as 30).Loudness is OFF. CRSC becomes OFF regardless of thefunctional excuse, too.The BASS / TREBLE and BALANCE / FADER controls canbe set to the full boost / full cut and full front / full rear and fullright / full left respectively by press

48、ing the “Track Up” / “TrackDown” keys.Sound coordination(Kex / ec4 / dB) doesnt appear for theAudio mode feed.ELECTRIC UNITPC BOARD (Component Side View)A B C D E F G IH1234567SWITCH UNITRefer to the schematic diagram for the values of resistors and capacitors.C89 C88R126 R125 R124R123 R122R121 R120 R119 R118C83C61C77C70R150R151 R152C39 R146C38R147C41