Component Description - Kenwood KDC-305RG Service Manual

SWITCH UNIT(X13-9872-XX)
Ref.No. Component Name
IC1 LC75883E
Q1 DTA114EKorKRA102Sor
UN2111
ELECTRIC UNIT(X25-8712-XX)
Ref.No. Component Name
IC1 UPD780058GC232
IC2 TDA7407D
IC4 TDA7386
IC6 TDA7479D
IC7 BA4911-V4
IC8 HD74HC27FP
IC11 S-80830ANNP
IC12 BR24C01AForBR24C01AF-W
M24C01-WMN6TorS-24C01B
Q10 2SC4081or2SD1819A
Q20 2SC4081or2SD1819A
Q40 DTA124EUAorUN5112
Q50 2SA1036K
Q51 UMC2N
Q53 UMC2N
Q55 2SD2375or2SD2396
Q70 2SC4081or2SD1819A
Q101 2SC4081or2SD1819A
Q102 DTA114YUAorUN5114
Q201 2SC4081or2SD1819A
Q223,224 DTC143TUAorUN5216
Q251 DTC114YUAorUN5214
Q301 DTC124EUAorUN5212
KDC-305RG/3018R/3090R/A/G/YA/YG

COMPONENT DESCRIPTION

Application/Function
LCD driver
key-matrix permission SW
Application/Function
System µ-COM.
E-VOL. & N.C. MPX
Power IC
RDS decoder
Power supply IC
Mute gate IC
RESET IC
E2PROM
B.U. detection
ACC detection
PREOUT mute driver
SW 5V
SW 14V
Switch for power supply IC
AVR for SERBO +B
SURGE detection
DSI SW
PANEL 5V SW
NOISE Buff
PREOUT MUTE
Power IC SVR SW
FM Lo/DX SW
Operation/Condition/Compatibility
Ready on key-matrix
Ready on key-matrix, ON when the base goes "Lo"
Operation/Condition/Compatibility
3 input NOR gate x3
Detection voltage 3.0V
Detect BU voltage
Detect ACC voltage
Mutes when base is "Lo" (controls Q221-224)
ON when the base is "Lo".
ON when the base is "Hi" (controls Q55)
ON when the base is "Hi" (controls SW1 pin of power
supply IC)
Output issued when SW14V is on (base is "Hi")
Detect SURGE voltage
DSI LED turns ON when base is "Hi"
ON when the base is "Lo"
Mute applied to PREOUT (output) when base is "Lo"
Turns ON when base is "Hi" and capacitor on SVR
pin discharges
Turns ON during Lo. SEEK when base goes "Hi"
3