Component Description - Kenwood KDC-5090B Service Manual

KDC-5090B/BY
SWITCH UNIT (X13-99XX-X4)
Ref. No. Component Name
IC1 LC75808W
IC2 RS-171
Q1 DTA114EUA or KRA302
Q3 2SD2114K
Q4 2SD2114K
Q5 2SC2412K or 2SD601A
Q6 DTA114EUA or KRA302
Q7 DTC143ZK
ELECTRIC UNIT (X25-87X2-7X)
Ref. No. Component Name
IC1 UPD703033GC117
or UPD703033GC145
IC2 TDA7407D
HD74HC02FP
IC3
or TC74HC02AF
IC4 TA8263BH
IC7 TDA7479D
IC8 S-80837ANNP
Q1 DTC143TUA or KRC410
Q2 DTC143TUA or KRC410
Q5 DTC143TUA or KRC410
Q6 DTC143TUA or KRC410
Q7 DTA124EUA or KRA303
Q11 2SC4081 or 2SD1819A
Q12 2SB1548(P)
Q13 2SA1576A or 2SB1218A
Q14 2SC4081 or 2SD1819A
Q15 2SB1548(P)
Q16 DTC124EUA or UN5212
Q17 DTA124EUA or KRA303
Q18 2SD2375
Q19 DTC124EUA or UN5212
Q20 DTA124EUA or KRA303
4

COMPONENT DESCRIPTION

Application / Function
LCD driver with the key matrix
Remote sensor IC
Key-permission SW
Red LED SW
Green LED SW
VLCD AVR
REMO SW
Dimmer SW
Application / Function
System MI-COM.
E.VOL & N.C.MPX IC
Mute logic
Power AMP. IC
RDS decoder
Reset IC
Pre mute (Front L)
Pre mute (Front R)
Pre mute (Rear L)
Pre mute (Rear R)
Mute driver
BU 5V AVR
SW 5V
A8V AVR
SW14V SW
SERVO +B AVR
ILL +B SW
Operation / Condition / Compatibility
For the key scanning start
When a base goes Hi, RED LEDs are turned on.
When a base goes Hi, GREEN LEDs are turned on.
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 wave shape is applied to Q7's base.
Operation / Condition / Compatibility
2-input NOR x 4
When BU 5V voltage is less than 3.7V, IC outputs Lo.
When Q1's base goes Hi, Pre-output is muted.
When Q2's base goes Hi, Pre-output is muted.
When Q5's base goes Hi, Pre-output is muted.
When Q6's base goes Hi, Pre-output is muted.
When BU detection SW or System RESET or MI-COM.'s
Pre-mute is working, a base goes Lo, and Q7 is turned on.
While BACKUP is applied, AVR outputs +5V.
Q11 and Q12 are inverted Darlington connection.
While a base goes Lo, SW 5V is supplied to the
microprocessor peripheral circuits.
When Q14's base goes Hi, A8V AVR outputs 8V.
A8V AVR and SERVO +B AVR ON/OFF control
While Q16's base goes Hi, Q17 is turned on, A8V AVR and
SERVO +B AVR are working.
When Q18's base goes Hi, SERVO +B AVR outputs 8V.
ILL +B AVR ON/OFF control
While Q19's base goes Hi, Q20 is turned on, and ILL +B
AVR is working.