Kenwood KDC-MP208 Service Manual page 4

KDC-MP208/MP238/MP238CR/MP239
KDC-MP3039/MP339/MP339S/MP439
Ref. No. Application / Function
IC5 D1.5V REG.
IC6 D3.3V REG.
IC11 BU1.5V REG.
Q1 APC (Auto Power Control)
Q10~12 5V–3.3V Level Shift
Q13 Inverter
D1 Level Down
D2 Laser Diode Protection
D3,4 Static Electricity Countermeasure
4
COMPONENTS DESCRIPTION
Power supply for digital 1.5V.
Power supply for digital 3.3V.
Power supply for back-up 1.5V.
Drives LD (Laser Diode).
Converts signal from 5V to 3.3V, or from 3.3V to 5V.
Inverts ZDET signal.
Lowers signal level by about 1.2V so that Lo level signal that turns the regulator ON/OFF
surely becomes Lo judgment level of the regulator SW.
Prevents reverse bias which is applied to laser. Laser destruction prevention.
Prevents malfunction by static electricity.
Operation / Condition / Compatibility