Casio CTK-220L User Manual
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BLOCK DIAGRAM
Buttons
Illuminant
Keyboard
Keyboard
7 seg. LED
LED Latch
IC2, IC3
Q5 ~ Q8
Q1 ~ Q4
PG
X1, Q11
Reset IC
IC1
Power Supply Circuit
Q301 ~ Q304
D334, D336
Amp.
IC301
LA4598
Filter
Q305
Phone/Output
DC+9 V IN
APO
MD0 ~ MD7
KO8 ~ KO11
LY1 ~
LY7
KO0 ~ KO7
LX0 ~
LX7
KI0 ~ KI7
CPU
LSI1
MSM 6755B-13
LED Driver
LED Driver