KRC-694/Y
KRC-766
4
COMPONENTS DESCRIPTION
q SWITCH UNIT (X16-2020-11)
Ref. No
Purpose ¡ Function
Operation/Condition/Compatibility
IC1
LCD driver
Drives LCD
IC2
Remote control IC
Controls the unit
Q1,Q4
REMO ON switch
The power supply of IC2 is turned on when base level goes "L"
Q2
Key Illumination switch (Green)
Lights Green key-illumination when base level goes "H"
Q3
Key Illumination switch (Red)
Lights Red key-illumination when base level goes "H"
q SYNTHESIZER UNIT (X14-918x-xx)
Ref. No
Purpose ¡ Function
Operation/Condition/Compatibility
IC1
System
µ-com
Controls FM/AM tuner, the changer, cassette mechanism, Panel, volume and tone.
IC2
E.Vol & N.C.MPX
Controls the source, volume, tone and FM multiplex detector.
IC3
Power supply IC
BU5V(5V) Audio8V(8V) FM+B(8V)
AM+B(8V) P-CON ANT-CON
IC4
Power IC
Amplifies the front L/R and the rear L/R to 50W or 47W maximum.
IC6
Muting logic IC
Controls logic for muting.
IC7
RDS decoder
IC8
Reset IC
"L" when detection voltage goes below 3.5V or less.
IC9
Equalizer amplifier
Dolby-B, Metal-EQ, Equalizer the Tape sound(120
µ sec).
IC11
Sub motor driver
Sub motor control
Q1
Serge detection
"L" when the back-up voltage becomes more than 18V(momentary power down).
"H" when the back-up voltage becomes less than 18V.
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".
Q5
Power-antenna detection
"H" when P-ANT output is short-circuit(P.ANT OFF).
"L" when FM/AM signal does not exist.
Q6
P-CON detection
"H" when P-CON output is short-circuit.
Q51
Main motor switch 1
Outputs 14V when the base is "L".
Q52
Main motor switch 2
Q51 turns ON when the base is "H" .
Q53
Sub motor AVR
Output 3.6V when the base of Q4 is "L".
Q54
MSTC switch
ON when the base is "H" .
Q101
Composite signal buffer
Q151
DSI driver
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.
Q152
Panel 5V switch
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.
Q201
Noise buffer
Q350
Pre mute switch
Drives the pre mute switch (Q351~354) when the base is "L".
Q351
Pre mute switch
Mutes the rear Lch when the base is "H".
Q352
Pre mute switch
Mutes the rear Rch when the base is "H".
Q355
Pre mute switch
Mutes the front Lch when the base is "H".
Q356
Pre mute switch
Mutes the front Rch when the base is "H".
EN1
ILLUMI
0V
OFF
5V
ON
IN
OUT
EN2
AM
FM
A8V
0V
OFF
OFF
OFF
2.5V
OFF
ON
ON
5V
ON
OFF
ON
IN
OUT
EN3
ANT-CONP-CON
0V
OFF
OFF
2.5V
OFF
ON
5V
ON
ON
IN
OUT
IN
SUB MOTOR
IN1()
IN2(+)
L
L
STOP
LH
CW
H
L
CCW
H
H
STANBY
