KENWOOD KDCMP225
Manual de Servicio

KDC-MP225,MP4026/G KDC-W4527/G/GY/Y,W427Y

COMPONENTS DESCRIPTION
� SWITCH UNIT (X16-2640-xx/2642-xx/2652-xx)
Ref. No. IC1 IC2 Q1 Q2 Q3 Application / Function LCD driver Remote control IC KEY scan detector key illumination SW key illumination SW Drive for LCD unit Receiving for the remote control unit key scan start at base gose �L�. Lights up for RED key illumination when base voltage level goes �H� Lights up for GREEN key illumination when base voltage level goes �H� Operation / Condition / Compatibility

� ELECTRIC UNIT (X25-9980-xx/9982-xx/X34-3172-70)
Ref. No. IC1 IC2 Application / Function System microcomputer Electronic volume & N.C.MPX Operation / Condition / Compatibility Control for TUNER unit, CD mechanism, volume & tone, LCD driver and external CD changer unit Control for source selector, volume & tone, and FM multiplex detector. Power supply for the units (Bu5V, Audio8V, FM+B, AM+B, P-con and ANT-con) SW1 1.5~3.0V 3.5~5.0V IC3 Power supply IC 7.0V~ SW2 2.0~3.0V 4.0V~ IC4 IC6 IC7 IC8 IC9 Q1 Audio power amp IC Muting control IC RDS decoder Reset IC Switching regulator Serge detection When backup voltage become less than 24V output is �H� When BU voltage supplied output is �L� / Q2 Q3 Q4 Q21,24 Q22 Q23 Q41 Q101 Q151 Q201 Backup detection When BU voltage not supplied or momentary power down is detected output is �H� ACC detection SW 5V AVR SW IC control SW Buffer amp DSI driver turns off / When panel assy is pull off, cut off the supply to panel 5V AVR. Buffer amp Noise buffer amp When ACC voltage supplied output is �L� When base voltage is �L� Q4 is ON Servo regulator Servo SW Power supply IC controller Switching regulator control SW Composite signal buffer When base voltage level is �L� DSI LED is light up / When base voltage level is �H� DSI LED Audio ON Audio P-con ON Audio P-con, P-ant ON OUT Illumination, FM ON Illumination, AM ON OUT

Amplifier for audio signal to derive for 4channel speakers (50W maximum for each channel) Control for timing for mute Decode for RDS signal When detection voltage goes below 3.5V or less Reset IC output change to �L� signal Power supply for CD mecanism unit When backup voltage become more than 24V output is �L� (momentary power down) /

4