Kenwood KDCBT 648 U Service Manual

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KDC-348U/47518D/ BT41 U/ BT648U
/U4549/U45498D/U54QBT/X395/X695
COMPONENTS DESCRIPTION

0 CD PLAYER UNIT (X32-6250-02)

Ref. No. Application / Function Operation / Condition / Compatibility
_ Driver for focusing & tracking coil, driver for sled & spindle motor, and operation

[CS 4ch BTL Driver , . . ,

for disc loading & ejection.
[C4 Servo DSP with built-in Audio DAG With built-in MPS/WMA/ACC decoder and 1M-bit-SRAM.
ic5 BU1.5V/D3.3V REG. Power amp for B_U_1'5V' _

Power supply for digital/analogue/audio 3.3V.
01 AFC (Auto Power Control) Drives LD (Laser Diode).

Switches ON/OFF at one end of BU1.5Vline which is separated into 2 directions.
014 D1 .5V Output

Uses output voltage as D1 .5\/.

Prevents reverse bias which is applied to laser.
Laser destruction prevention.

D2 Laser Diode Protection

D3,4 Static Electricity Countermeasure Prevents malfunction by static electricity.