Kenwood KMD-44, Service Manual

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5
KMD-44
COMPONENTS DESCRIPTION
Ref. No. Component name Application/Function Operation/Condition/Compatibility
IC1 LC75808W LCD driver with key-matrix
IC2 RS-171 Remote control light sensor
Q1 DTA114EK or UN2111 Key-matrix permission SW Ready on key-matrix, ON when the base goes "Lo".
Q2 2SD2114K Illumination SW(Red) ON when the base goes "Hi".
Q3 2SD2114K Illumination SW(Green) On when the base goes "Hi".
Q4 2SC2412K or 2SD601A LCD AVR
Ref. No. Component name Application/Function Operation/Condition/Compatibility
IC1 UPD784216GF531 System MI-COM.
IC2 TDA7407D E-VOL. & N.C. MPX
IC3 M5237ML AVR IC
AVR IC is combined with Q5, and it works as the error
detection, the driver.
IC4 TDA7386 Power IC
IC6 LM2595S-ADJ MD SERVO AVR A DC/DC Converter wiht the ON/OFF function.
IC7 S-80830ANNP Reset IC "L" : detection voltage below 3.0V
IC8 HD74HC27FP Mute logic 3 input NOR gate x3
IC10 TDA7479D RDS decoder
Q1 2SC4081 or 2SD1819A
BU 5V AVR
Inverted darlington connection
Q2 2SB1548(P)or 2SB1655(E, F) On during BU applied.
Q3 DTA124EUA or UN5112
Audio 8V AVR ON/OFF control
Q4
DTC144EK or UN2213 Audio 8V AVR ON/OFF SW
Q3 is turned ON when Q4's base goes "Hi".
or KRC104S
Q5 2SB1548(P)or 2SB1655(E, F) Audio 8V AVR Output voltage 8.3V
Q7 DTC144EUA or UN5213
Q8 DTA124EUA or UN5112 Illumination AVR AVR output is ON when Q7's base goes "Hi".
Q9 2SD1760
Q10 2SA1037K SW 5V ON when the base goes "Lo".
Q13 2SB1277(Q, R)
Q16
DTC114YK or UN2214 P-CON SW Q13 is turned ON when Q16's base goes "Hi".
or KRC107S
Q14 2SA1037K Protect Q13 by turning ON when P-CON output is grounded.
Q15
DTA124EK or UN2112 P-CON protection
Prevents Q14 turning ON during start-up after power ON.
or KRA103S
Q17 2SC2412K or 2SD601A
BU detection
ON when the base goes "Hi" during BU applied.
(Momentary power down detection)
Q18 2SC2412K or 2SD601A ACC detection ON when the base goes "Hi"during ACC applied.
Q19
DTA124EK or UN2112
Mute driver for Audio mute SW ON when the base goes "Lo".
or KRA103S
Q20
DTC144EK or UN2213
E-VOL. mute SW E-VOL. is muted when the base goes "Hi".
or KRC104S
Q21, 22 DTC143TK or UN2216 Audio mute SW Audio pre-outs are muted when the base goes "Hi".
Q23 DTC114YK or UN2214 SVR SW POWER IC RESET is activated when the base goes "Hi".
Q24 DTA114YUAor UN5114 Panel detection SW ON when the base goes "Lo" during the panel closed.
Q25
DTC124EK or UN2212
or KRC103S
FM+B SW
Q26 is turned ON when Q25's base goes "Hi".
Q26 2SB1277(Q,R)
ON during FM reception
Q27
DTC124EK or UN2212
Q28 is turned ON when Q27's base goes "Hi".
or KRC103S AM+B SW
Q28 2SB1277(Q,R)
ON during AM reception
Q29 2SC4081 or 2SD1819A Composite signal output buffer
Q30 2SC4081 or 2SD1819A Noise buffer
Q33
DTC144EK or UN2213
RESET SW
System RESET is activated when the panel reset SW
or KRC104S is pushed
Q34 2SC4081 or 2SD1819A DSI driver ON when the base goes "Hi".
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SWITCH UNIT (X13-9700-11)
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ELECTRIC UNIT (X25-8840-11)