Casio CTK-220L manual Block Diagram, CPU LSI1

Page 4

BLOCK DIAGRAM

Phone/Output

7 seg. LED

LED Latch	IC2, IC3

MD0 ~ MD7



					Amp.
— 2					IC301
— 2					LA4598			Filter
—					LA4598			Filter
—								Q305
								Q305


DC+9 V IN			Power Supply Circuit					APO
				Q301 ~ Q304				APO
				Q301 ~ Q304
				D334, D336

CPU

LSI1

MSM 6755B-13

KO8 ~ KO11

KI0 ~ KI7

KO0 ~ KO7

LX0 ~ LED Driver LX7

Q5 ~ Q8

LY1 ~	LED Driver
LY7

Q1 ~ Q4

Buttons

Illuminant

Keyboard

PG

X1, Q11

Reset IC

IC1

Image 4

Contents CTK-220L Contents Specifications GeneralBlock Diagram CPU LSI1Circuit Description KEY MatrixCPU LSI1 MSM6755B-13 Filter Block Major Waveforms Printed Circuit Boards Sub PCB KDM445-MA2MSchematic Diagrams Sub PCBs KDM445-MA2M/MA3M Keyboard PCBs KDM4910K-KY1M/KY2M LED PCB KDM446-LD1M LED PCB KDM445-LD2M LED PCB KDM446-LD3M Exploded View Parts List Keyboard PCBs Nov MA1100761A