Component Description - Kenwood KDC-5019 Service Manual

SWITCH UNIT(X16-154X-XX, X16-1892-7X)
Ref.No. Component Name
IC1 LC75808W
IC2 RS-171
Q1 DTA114EUA or KRA302 Key permission SW
Q3 2SC4081
Q4 2SC4081
Q5 2SC4081
Q6 DTA114EUA or KRA302 REMO SW
Q7 DTC143ZK
ELECTRIC UNIT(X25-939X-XX, X25-8762-7X)
Ref.No. Component Name
IC1 UPD703033GC139
IC2 TDA7407D
IC3 M5237ML
IC4 TA8273H
HD74HC02FP
IC8 or TC74HC02AF
or 74VHC02SJ
IC14 TDA7479D
IC15 LB1930M
IC16 S-80837ANNP
Q1 2SB1548(P)
Q2 2SC4081 or 2SD1819A
Q3 2SA1576A or 2SB1218A SW 5V
Q4 2SB1548(P)
Q5 DTC144EUA or UN5213
Q6 DTA124EUA or KRA303
Q7 DTA124EUA or KRA303
Q8 DTC144EUA or UN5213
Q9 2SD2375
Q10 2SB1184
Q11 2SC4081 or 2SD1819A
Q12 DTC144EUA or UN5213
Q13 DTA124EUA or KRA303
Q14 DTA123JK or KRA105S EXT. AMP CON. SW
Q15 DTC144EUA or UN5213 Small lamp detection SW When vehicle small lamps turn on, Q15 is turned on .
Q24 DTC114YUA or UN5214
Q25 2SB1277(Q,R)
Q26 2SB1277(Q,R)
Q29 DTC114YUA or UN5214
Q27 2SA1576A or 2SB1218A P-CON. protection SW Protect Q26 by turning ON when P-CON output is grounded.
Q28 DTA124EUA or KRA303 P-CON. protection inhibit SW Prevents Q27 tuning ON during start-up after power ON.
Q30 2SC4081 or 2SD1819A BU detection SW
Q31 2SC4081 or 2SD1819A ACC detection SW
Q32 DTA124EUA or KRA303 Mute driver for L Ch.
Q33 DTA124EUA or KRA303 Mute driver for R Ch.
Q35 DTC124EUA or UN5212 E. VOL mute SW
Q36 2SC4081 or 2SD1819A Noise buffer
KDC-5019/519/7021/7021Y/8020/B7021

COMPONENT DESCRIPTION

Application/Function
LCD driver with key matrix
Remote sensor IC
For the key scanning start and the key detection SW
Red LED SW When a base goes Hi, RED LEDs are turned on.
Green LED SW When a base goes Hi, GREEN LEDs are turned on.
VLCD AVR For LCD driver IC
While a base goes Lo, PAN 5V is supplied to the Remote sensor IC.
Usually Q7's base goes Hi. When DIMMER mode is selected, pulse
Dimmer SW
wave shape is applied to Q7's base.
Application/Function
System MI-COM.
E.VOL & N.C.MPX IC
AVR IC IC is combined with Q4, and it works as the error detection, the driver.
Power IC
Mute logic 2-input NOR x 4
RDS decoder
Motor driver IC
Reset IC When BU 5V voltage is less than 3.7V, IC outputs Lo.
While BACKUP is applied, AVR outputs +5V.
BU 5V AVR
Q1 and Q2 are inverted Darlington connection.
While a base goes Lo, SW 5V is supplied to the microprocessor
peripheral circuits.
A8V AVR Q4 is combined with IC3, and it outputs +8.3V.
A8V AVR ON/OFF control
A8V AVR SW
While Q5's base goes Hi, Q6 is turned on, and A8V AVR is working.
A8V AVR and SERVO +B AVR ON/OFF control
SW14V SW While Q8's base goes Hi, Q7 is turned on, A8V AVR and SERVO +B
AVR are working.
SERVO +B AVR When Q9's base goes Hi, SERVO +B AVR outputs +7.6V.
While Q11's base goes Hi, AVR outputs +10.7V.
ILL +B AVR
Works during POWER ON mode with a panel attached to the set.
ILL +B AVR ON/OFF control
ILL +B SW
While Q12's base goes Hi, Q13 is turned on, and ILL +B AVR is working.
When a base goes Lo, Q14 is turned on, and control pulse waveform
shape is outputted.
When Q24's base goes Hi, Q25 is turned on.
ANT-CON. SW
Works during the tuner reception mode.
When Q29's base goes Hi, Q26 is turned on .
P-CON SW
Works during POWER ON mode.
While BACKUP is applied, a base goes Hi, and Q30 is turned on.
When momentary power down has detected, a base goes Lo, and
Q30 is turned off.
While ACC is applied, a base goes Hi, and Q31 is turned on.
When BU detection SW or System RESET or MI-COM.'s Pre-mute is
working, a base goes Lo, and Q32 and Q33 are turned on.
When BU detection SW or MI-COM.'s mute is working, a base goes
Hi, and Q35 is turned on.
Operation/Condition/Compatibility
Operation/Condition/Compatibility
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