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KRC-594/V/Y/YV
SWITCH UNIT (X16-2032-7x)
Ref. No
Purpose
IC1
LCD driver
IC2
Remote control IC
Q1,Q4
REMO ON switch
Q2
Key Illumination switch (Green)
Q3
Key Illumination switch (Red)
SYNTHESIZER UNIT (X14-9182-71)
Ref. No
Purpose
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
Equalizer amplifier
IC11
Sub motor driver
Q1
Serge detection
Q2
BACK-UP detection
Q3
ACC detection
Q4
SW 5V
Q5
Power-antenna detection
Q51
Main motor switch 1
Q52
Main motor switch 2
Q53
Sub motor AVR
Q54
MSTC switch
Q101
Composite signal buffer
Q151
DSI driver
Q152
Panel 5V switch
Q201
Noise buffer
Q350
Pre mute switch
Q351
Pre mute switch
Q352
Pre mute switch
4
COMPONENTS DESCRIPTION
Function
¡
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"
Function
¡
Controls FM/AM tuner, the changer, cassette 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
EN1
Amplifies the front L/R and the rear L/R to 50W or 47W maximum.
Controls logic for muting.
"L" when detection voltage goes below 3.5V or less.
Dolby-B, Metal-EQ, Equalizer the Tape sound(120µ sec).
Sub motor control
"L" when the back-up voltage becomes more than 18V(momentary power down).
"H" when the back-up voltage becomes less than 18V.
"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".
"H" when P-ANT output is short-circuit(P.ANT OFF).
"L" when FM/AM signal does not exist.
Outputs 14V when the base is "L".
Q51 turns ON when the base is "H" .
Output 3.6V when the base of Q4 is "L".
ON when the base is "H" .
DSI lights when the base is "L".
DSI turns off when the base is "H" .
DSI turns on and off when panel is taken off.
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 5V cut off.
Drives the pre mute switch (Q351~354) when the base is "L".
Mutes the rear Lch when the base is "H".
Mutes the rear Rch when the base is "H".
Operation/Condition/Compatibility
Operation/Condition/Compatibility
IN
OUT
IN
ILLUMI
EN2
AM
0V
OFF
0V
OFF
5V
ON
2.5V
OFF
5V
ON
IN
IN1(–)
IN2(+)
L
L
L
H
H
L
H
H
OUT
IN
OUT
FM
A8V
EN3
ANT-CONP-CON
OFF
OFF
0V
OFF
ON
ON
2.5V
OFF
OFF
ON
5V
ON
SUB MOTOR
STOP
CW
CCW
STANBY
OFF
ON
ON
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