Kenwood KDC-348U Service Manual page 5

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● CD PLAYER UNIT (X32-6250-02)
Ref. No.
Application / Function
IC3
4ch BTL Driver
IC4
Servo DSP with built-in Audio DAC
IC5
BU1.5V/D3.3V REG.
Q1
APC (Auto Power Control)
Q14
D1.5V Output
D2
Laser Diode Protection
D3,4
Static Electricity Countermeasure
COMPONENTS DESCRIPTION
Driver for focusing & tracking coil, driver for sled & spindle motor, and operation
for disc loading & ejection.
With built-in MP3/WMA/ACC decoder and 1M-bit-SRAM.
Power supply for BU1.5V.
Power supply for digital/analogue/audio 3.3V.
Drives LD (Laser Diode).
Switches ON/OFF at one end of BU1.5V line which is separated into 2 directions.
Uses output voltage as D1.5V.
Prevents reverse bias which is applied to laser.
Laser destruction prevention.
Prevents malfunction by static electricity.
KDC-348U/4751SD/BT41U/BT648U
/U4549/U4549SD/U549BT/X395/X695
Operation / Condition / Compatibility
5

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