4
KDC-W4044UA/W4044UAY/W4044UG/W4044UGY
KDC-W413UA/W413UAY/W4544U/W4644UY
COMPONENTS DESCRIPTION
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ELECTRIC UNIT (X34-623x-xx)
Ref. No.
Application / Function
Operation / Condition / Compatibility
IC1
System
μ
-COM
Controls FM/AM tuner, the changer, CD mechanism, panel, volume and tone.
IC2
E-VOL
Controls the source, volume, tone.
IC4
Power Supply IC
Outputs 5V×2, 8.1V×2, 10.2V, P-CON, P-ANT.
IC6
Power IC
Ampli
fi
es the front L/R and the rear L/R to 50W maximum.
IC7
RDS IC
Decodes RDS.
IC8
Reset IC
Lo when detection voltage goes below 3.6V.
IC51
Switching Regulator
Power supply for D+5.1V. (to USB and Panel)
IC52
Hi-side SW
Detects USB Over Current.
IC53
D+3.3V AVR IC
Power supply for D+3.3V. (IC252,900,950)
IC251
Level Shift (3.3V
→
5V)
Shifts level. (3.3V
→
5V)
IC252
Level Shift (5V
→
3.3V)
Shifts level. (5V
→
3.3V)
IC900
Sub
μ
-COM
Controls USB and CD mechanism.
IC950
i-Pod Authentication Coprocessor
Authenticates i-Pod.
Q2
Servo+B AVR
When Q3’s base goes Hi, AVR outputs 7.5V.
Q3
Control SW for Servo +B
ON when the base goes Hi.
Q7
FL+B SW
ON when the base goes Hi.
Q8
FL+B AVR
When Q9’s base goes Hi, AVR outputs 10.5V.
Q9
Control SW for FL+B
ON when the base goes Hi.
Q10
FL+B SW
ON when the base goes Lo.
Q11
14V SW
ON when the base goes Hi.
Q12
14V SW
ON when the base goes Lo.
Q51
Control SW for 16V SW
ON when the base goes Hi.
Q52
16V SW
When Q51’s base goes Hi, AVR outputs BU voltage.
Q53
FREQ CONT SW for IC51
1.3MHz when the base goes Lo, 1.8MHz when the base goes Hi.
Q101
ACC DET
ON when the base goes Hi during ACC is applied.
Q102
Serge DET
When the base goes Hi, Surge voltage is detected.
Q103
BU DET
ON when the base goes Hi during BU is applied.
Q104,105
Mute Control
ON when the base goes Hi.
Q301
Panel 5V SW
ON when the base goes Lo.
Q701,702
Pre-out Mute SW
When a base goes Hi, pre-out is muted.
Q705
Mute Driver for Pre-out
ON when the base goes Lo.
Q902,903
3.3V AVR for IC900
When base of Q902 goes Hi, 3.3V is ON.
Q905
CD “LOE_LIM_SW”_Buffer
When the base goes Hi, loading ends.
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SWITCH UNIT (X16-647x-xx)
Ref. No.
Application / Function
Operation / Condition / Compatibility
IC1
FL Driver
IC2
Remote Control Sensor
