Component
Purpose • Function
Operation • Conditions • Compatibility
IC1
System u-com
IC2
E-VOL, N.C, MPX
IC3
Regulator IC for Audio 8V
IC4
Power IC
IC10
Mute logic IC
IC11
RDS decoder
IC13
Motor driver IC
IC15
Reset IC
Q1~4
PRE OUT MUTE SW
Pre outs are muted when the base goes "H".
Q18~20
Audio 8V AVR
Inverted darlington connection
Q20 is turned ON when Q18's base goes "H".
Q21, 22
B.U 5V AVR
Inverted darlington connection
Q22 is turned ON when Q21's base goes "H".
Q23
SW 5V
ON when the base goes "L".
Q24
B.U detection
ON when the base goes "H" during B.U applied.
Q25
ACC detection
ON when the base goes "H" during ACC applied.
Q26, 27
P-ANT SW
Q26 is turned ON when Q27's base goes "H".
Q28~31
P-CON SW
Q28 is turned ON when Q31's base goes "H".
Q32
Dimmer SW
ON when the base goes "H" while vehicle small lamps turn on.
Q33, 34, 44
Illumination AVR
ON when Q44's base goes "H".
Q36
SW 14V
ON when base goes "H".
Q37, 38
Motor driver supply
Q38 is turned ON when Q37's base goes "H".
Q39
External Amp Control
ON when the base goes "L".
Q41, 42
Cassette mecha main motor
Q42 is turned ON when Q41's base goes "H".
supply SW
Q43
Motor driver's voltage SW
Base "H" ··· cassette mecha's submotor
Base "L" ··· mask mecha's motor.
Q45, 46
Panel 5V SW
Q45 is turned ON when Q46's base goes "H".
Q71
Pre out mute driver
ON when the base goes "L".
Q72
E-VOL Mute SW
ON when the base goes "H".
Q73
Noise buffer
Q85
IFC out buffer
Q86, 88
AM+B SW
Q88 is turned ON when Q86's base goes "H".
Q87, 89
FM+B SW
Q89 is turned ON when Q87's base goes "H".
Q90
Composite out buffer
KRC-709,779R/RY,889
3
COMPONENT DESCRIPTION
(X14-644x-xx)
(X14-6452-73)
Component
Purpose • Function
Operation • Conditions • Compatibility
IC1
LCD Driver with Key Matrix
IC2
Remote Control IC
Q2
Key Detection SW
Q2 starts key scan in M&T.
Q3, 4
Key Illumination SW
Lights key illumination in Red when the base of Q3 is ON.
Lights key illumination in Green when the base of Q4 is "H"
Q5
VLCD Reference Voltage Supply
Constant voltage circuit.
Q6
Remote Control IC Power Supply
Activates remote control when the base of Q6 is "L"
Q7
Dimmer SW
The base of Q7 is normally "H" but becomes "
" when DIMMER is ON.
(X13-9960-10)
(X13-9992-73)
(X87-3022-71)
(X87-3032-73)
Component
Purpose • Function
Operation • Conditions • Compatibility
IC1
Playback EQ, Dolby & Blank Detection
Q1
Constant Switching in Blank Detection
Switches the time constant according to the PLAY or FF/REW mode.
