Components Description - Kenwood KMD-44 Service Manual

G
SWITCH UNIT (X13-9700-11)
Ref. No. Component name
IC1 LC75808W
IC2 RS-171
Q1 DTA114EK or UN2111
Q2 2SD2114K
Q3 2SD2114K
Q4 2SC2412K or 2SD601A
G
ELECTRIC UNIT (X25-8840-11)
Ref. No. Component name
IC1 UPD784216GF531
IC2 TDA7407D
IC3 M5237ML
IC4 TDA7386
IC6 LM2595S-ADJ
IC7 S-80830ANNP
IC8 HD74HC27FP
IC10 TDA7479D
Q1 2SC4081 or 2SD1819A
Q2 2SB1548(P)or 2SB1655(E, F)
Q3 DTA124EUA or UN5112
DTC144EK or UN2213
Q4
or KRC104S
Q5 2SB1548(P)or 2SB1655(E, F) Audio 8V AVR
Q7 DTC144EUA or UN5213
Q8 DTA124EUA or UN5112
Q9 2SD1760
Q10 2SA1037K
Q13 2SB1277(Q, R)
DTC114YK or UN2214
Q16
or KRC107S
Q14 2SA1037K
DTA124EK or UN2112
Q15
or KRA103S
Q17 2SC2412K or 2SD601A
Q18 2SC2412K or 2SD601A
DTA124EK or UN2112
Q19
or KRA103S
DTC144EK or UN2213
Q20
or KRC104S
Q21, 22 DTC143TK or UN2216
Q23 DTC114YK or UN2214
Q24 DTA114YUAor UN5114
DTC124EK or UN2212
Q25
or KRC103S
Q26 2SB1277(Q,R)
DTC124EK or UN2212
Q27
or KRC103S
Q28 2SB1277(Q,R)
Q29 2SC4081 or 2SD1819A
Q30 2SC4081 or 2SD1819A
DTC144EK or UN2213
Q33
or KRC104S
Q34 2SC4081 or 2SD1819A

COMPONENTS DESCRIPTION

Application/Function
LCD driver with key-matrix
Remote control light sensor
Key-matrix permission SW
Illumination SW(Red)
Illumination SW(Green)
LCD AVR
Application/Function
System MI-COM.
E-VOL. & N.C. MPX
AVR IC
Power IC
MD SERVO AVR
Reset IC
Mute logic
RDS decoder
BU 5V AVR
Audio 8V AVR ON/OFF SW
Illumination AVR
SW 5V
P-CON SW
P-CON protection
BU detection
(Momentary power down detection)
ACC detection
Mute driver for Audio mute SW
E-VOL. mute SW
Audio mute SW
SVR SW
Panel detection SW
FM+B SW
AM+B SW
Composite signal output buffer
Noise buffer
RESET SW
DSI driver
KMD-44
Operation/Condition/Compatibility
Ready on key-matrix, ON when the base goes "Lo".
ON when the base goes "Hi".
On when the base goes "Hi".
Operation/Condition/Compatibility
AVR IC is combined with Q5, and it works as the error
detection, the driver.
A DC/DC Converter wiht the ON/OFF function.
"L" : detection voltage below 3.0V
3 input NOR gate x3
Inverted darlington connection
On during BU applied.
Audio 8V AVR ON/OFF control
Q3 is turned ON when Q4's base goes "Hi".
Output voltage 8.3V
AVR output is ON when Q7's base goes "Hi".
ON when the base goes "Lo".
Q13 is turned ON when Q16's base goes "Hi".
Protect Q13 by turning ON when P-CON output is grounded.
Prevents Q14 turning ON during start-up after power ON.
ON when the base goes "Hi" during BU applied.
ON when the base goes "Hi"during ACC applied.
ON when the base goes "Lo".
E-VOL. is muted when the base goes "Hi".
Audio pre-outs are muted when the base goes "Hi".
POWER IC RESET is activated when the base goes "Hi".
ON when the base goes "Lo" during the panel closed.
Q26 is turned ON when Q25's base goes "Hi".
ON during FM reception
Q28 is turned ON when Q27's base goes "Hi".
ON during AM reception
System RESET is activated when the panel reset SW
is pushed
ON when the base goes "Hi".
5