Components Description - Kenwood KDC-MP425 Service Manual

KDC-MP425/MP6026
KDC-W6027/W6027Y
SWITCH UNIT (X16-2490-10)
Ref. No. Application / Function
IC1 LCD Driver
IC2 Remote Control IC
Q2 REMO ON SW
Q3 Key Illumination SW (Green)
Q4 Key Illumination SW (Red)
Q5 Dimmer Control
ELECTRIC UNIT (X34-308x-xx)
Ref. No. Application / Function
System µ-COM
IC1
IC2 E.Vol & N.C.MPX
IC3 Power Supply IC
IC4 Power IC
IC6 Muting logic IC
IC7 RDS decoder
IC8 Reset IC
IC9 SW Regulator
Q1 Serge Detection
Q2 BACK-UP Detection
Q3 ACC Detection
Q4 SW 5V
Q21 Servo Regulator
Q22 Servo SW
Q23 Control Power Supply IC
Q31 Dimmer Control
Q41 SW Regulator Control
Q101 Composite signal buffer
4

COMPONENTS DESCRIPTION

Drives LCD
Controls the unit
The power supply of IC2 is turned on when base level goes "L"
Lights Green key-illumination when base level goes "H"
Lights Red key-illumination when base level goes "H"
Lights LCD Back Light when base level goes "H"
Controls FM/AM tuner, the changer, CD mechanism, Panel, volume and tone.
Controls the source, volume, tone and FM multiplex detector.
Bu5V (5V), Audio8V (8V), FM+B (8V), AM+B (8V), P-CON, ANT-CON
SW1
1.5~3.0 Audio ON
3.5~5.0 Audio P-CON ON
7.0~ Audio P-CON, P-ANT ON
SW2
2.0~3.0 ILL FM ON
4.0~ ILL AM ON
Amplifies the front L/R and the rear L/R to 50W maximum.
Controls logic for muting.
"L" when detection voltage goes below 3.6V or less.
Power Supply for MP3
"L" when the back-up voltage becomes more than 24V (momentary power down).
"H" when the back-up voltage becomes less than 24V.
"L" when B.u is present.
"H" when B.u is absent or momentary power down is detected.
"L" when Acc is present.
ON when the base is "L".
Dimmer ON when the base is "H".
Operation / Condition / Compatibility
Operation / Condition / Compatibility
OUT
OUT