Kenwood KDC-3025, Service Manual

Page: 4 / 30

KDC-3025/325/5026/G
4
●
SWITCH UNIT (X16-2500-xx)
Ref. No. Application/Function Operation/Condition/Compatibility
IC1 LCD Driver Drives LCD
IC2 Remote Control IC Controls the unit.
Q1,Q4 REMO ON SW The power supply of IC2 is turned on when base level goes “L”.
●
ELECTRIC UNIT (X34-3090-xx)
Ref. No. Application/Function Operation/Condition/Compatibility
IC1 System
µ
-COM Controls FM/AM tuner, the changer, CD mechanism, Panel, volume, and tone.
IC2 E.Vol & N.C.MPX Controls the source, volume, tone and FM multiplex detector.
Bu5V (5V) Audio8V (8V) FM+B (8V)
AM+B (8V) P-CON ANT-CON
IC3 Power Supply IC
IC4 Power IC Amplifies the front L/R and the rear L/R to 50W maximum.
IC6 Muting logic IC Controls logic for muting.
IC8 Reset IC “L” when detection voltage goes below 3.5V or less.
Q1 Surge Detection
“L” when the back-up voltage becomes more than 24V (momentary power down).
“H” when the back-up voltage becomes less than 24V.
Q2 BACK-UP Detection “L” when B.u is present. “H” when B.u is absent or momentary power down is detected.
Q3 ACC Detection “L” when Acc is present.
Q4 SW 5V ON when the base is “L”.
Q21 Servo Regurator
Q22 Servo SW
Q23 Conrtol Power Supply IC
DSI lights when the base is “L”.
Q151 DSI Driver DSI turns off when the base is “H”.
DSI turns on and off when panel is taken off.
Q152 Panel 5V SW
When the panel is attached, the base goes “L”, turning the Tr ON to supply 5V to the panel.
When panel is taken off, panel 5Vcut off.
Q153,Q154 ILLUMI Control ILLUMI lights when the base of Q153 is “H”.
Q201 Noise buffer
Q351 Pre Mute SW Mutes the Rear Lch when the base is “H”.
Q352 Pre Mute SW Mutes the Rear Rch when the base is “H”.
Q354 Pre Mute SW Drives the Pre Mute sw (Q351, 352, 355, 356) when the base is “L”.
Q355 Pre Mute SW Mutes the Front Lch when the base is “H”.
Q356 Pre Mute SW Mutes the Front Rch when the base is “H”.
COMPONENTS DESCRIPTION
SW1 OUT
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 ILLUMI FM ON
4.0~ ILLUMI AM ON
www. xiaoyu163. com
QQ 376315150
9 9
2
8 9
4 2
9 8
TEL 13942296513 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3
Q Q
TEL 13942296513 QQ 376315150 892498299 TEL 13942296513 QQ 376315150 892498299