3
KDC-237SA/237SAY
KDC-237SG/237SGY
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ELECTRIC UNIT (X34-4672-78)
Ref. No.
Application / Function
Operation / Condition / Compatibility
IC1
System
µ
-COM
Controls FM/AM tuner, the changer, CD mechanism, panel, volume and tone.
IC3
E-VOL
Controls the source, volume and tone.
IC4
Power Supply IC
Outputs 5Vx2, 8.1Vx2, 10.2V, P-CON and P-ANT.
IC6
Power IC
Amplifies the front L/R and the rear L/R to 45W maximum.
IC7
RDS IC
RDS decoder.
IC8
Reset IC
Lo when detection voltage goes below 3.6V.
Q1
SW14V
ON when the base goes Hi.
Q2
Servo+B AVR
When Q3’s base goes Hi, Servo+B AVR outputs 7.5V.
Q3
Control SW for Servo+B
ON when the base goes Hi.
Q7
VFD+B SW
ON when the base goes Hi.
Q8
VFD+B AVR
When Q9’s base goes Hi, Servo+B AVR outputs 10.5V.
Q9
Control SW for VFD+B
ON when the base goes Hi.
Q101
ACC DET
ON when the base goes Hi during ACC is applied.
Q102
Serge DET
When the base goes Hi, surge voltage is detected.
Q103
BU DET
ON when the base goes Hi during BU is applied.
Q104,105
Mute Control
ON when the base goes Hi.
Q301
Panel 5V SW
ON when the base goes Lo.
Q302
DSI ILLUMI SW
ON when the base goes Hi.
Q901
DC Offset DET
ON when the base goes Hi after Q902’s and Q903’s outputs are separated.
Q902,903
DC Offset DET SW
ON when the bases go Lo after IC6’s SP-OUTs (DC) are separated.
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SWITCH UNIT (X16-386x-xx)
Ref. No.
Application / Function
Operation / Condition / Compatibility
IC1
VFD Driver
●
CD PLAYER UNIT (X32-5980-00)
Ref. No.
Application / Function
Operation / Condition / Compatibility
Focusing, tracking, sled and spindle servo processing.
Automatic adjustment (focusing, tracking, gain, offset and balance) operations.
CD Signal Processor
Digital signal processing (DSP, PLL, sub-codes, CIRC error correction, audio data
IC1
& MECHA
µ
-COM
interpolation processing) operations, and microcomputer function.
RF Amplifier responding
Generation of RF signal based on the signals from the APC circuit and the laser pick-up,
to CD-RW
and generation of servo error (focusing error and tracking error) signals.
Detection of dropout, anti-shock, track crossing and off-tracking conditions, included gain
control function during CD-RW.
IC2
3.3V REG
Supplies 3.3V to IC1 and the laser pick-up.
IC3
3.3V REG
Supplies 3.3V to IC1 and audio circuit.
IC6
4ch BTL Driver
Focusing and tracking coil, sled and spindle motor driver, disc loading and eject operation.
Q1
A8V SW
Q1 is ON when Q2 is ON.
COMPONENTS DESCRIPTION