4
KDC-2027SA/SAY/SG/SGY, 3027A/AY/G/GY
KDC-308A/AY/G/GY, 4027/V/VY/Y, F327A/G
COMPONENTS DESCRIPTION
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SWITCH UNIT (X16-2462-7x/2472-7x)
Ref No.
Application/Functions
Operation/Condition/Compatibility
IC1
LCD driver
LCD derive & Key input interface
IC2
Sensor
Remote control sensor
Q1
Key scan detect
key scan start at base gose “L”.
Q2
LED SW
When Q2 base gose “H” LED is light on RED Color
Q3
LED SW
When Q2 base gose “H” LED is light on GREEN Color
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CD PLAYER UNIT (X32-5490-00)
Ref No.
Application/Functions
Operation/Condition/Compatibility
IC1
Mechanism control
When BU5V & MSTOP (12pin) goes “H” (IC1 is active)
IC2
SW3.3V AVR
When CNTL (1pin) goes “H” (SW3.3V AVR : ON)
IC3
CD DSP & servo IC
CD RF amp, Servo, DSP & DAC
IC4
BTL driver
Focus, tracking coil, Sled & Spindle motor driver IC
Q2
SW
SW5V SW transistor
Q3
APC
Auto Power Control
Q4
SW
EQ SW transistor
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ELECTRIC UNIT (X34-3102-7x)
Ref No.
Application/Functions
Operation/Condition/Compatibility
IC1
System control IC
System control microprocessor
IC4
Audio power IC
Audio power amplifier
IC6
RDS decoder
RDS decoder IC
IC7
Power supply IC
Multi AVR IC (for 5V, 8V, P-CON & P-ANT)
IC8
Muting logic IC
Control for MUTE, P-ANT & RESET muting
IC10
E-VOL & tuner IC
E-VOL. FM/AM tuner & stereo decoder
IC11
Reset IC
When BU5V line voltage is less than 3.5V, this IC output line is “L”
IC12
E2PROM
Memorized tuner adjustment data (save & load)
Q10
BU detector
When the base goes “H” during BU applied (ON)
Q20
ACC detector
When the base goes “H” during ACC applied (ON)
Q40
Muting driver foe Q223, 224
When the base goes “L” (Muting : ON)
Q50
SW5V
When the base goes “L” (SW5V : ON)
Q51
SW
Control SW for IC7
Q55
SERVO +B AVR
Servo AVR (7.4V)
Q70
Serge detector
When the base goes “H” (Serge detection)
Q101
DSI illumination SW
When the base goes “L” (DSI illumination : ON)
Q102
Panel 5V SW
When the base goes “L” (Panel 5V : ON)
Q201
Noise buffer
Tuner audio noise buffer amplifier
Q223,224
Preout muting SW
When the base goes “H” (Preout muting : ON)
Q251
SW
When the base goes “L” (IC4 : ON)
Q252
Smeter RC & MPTHTC SW
RC & TC is “LONG” when the base is “H” (base is “L” is AF search)
Q253
Smeter RC & MPTHTC SW
When collector is “H”, emitter is “H”
Q501
AM RF amplifier
When the base goes “H” (RF circuit gain is up)
Q502
FM RF amplifier
When the base goes “H” (RF circuit gain is up)
Q503
MPX buffer
MPX input buffer with RDS