Casio WK-1800 - Page 22

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POWER AMPLIFIER (IC201: LA4663)
The power amplifier is a two-channel amplifier with standby switch.
+
–
STAND BY V
CC
1V
CC
2
+ OUT1
– OUT1
– OUT2
+ OUT2
PER
GND1
PWR
GND2
Output amplifier
+
–
Output amplifier
Input amplifier
Input amplifier
CH 1
CH 2
Ripple Filter/
Starting Time
V
cc
/ground shorting
protection circuit
Load shorting protection circuit
Thermal protection circuit
Protection circuits
Ri=
20k Ω
Ri=
20k Ω
IN2
IN1
PRE
GND
SIGNAL
MUTE
3
875
6
2
3
4
1
13
12
9
10
11