Casio Explore the Features and Specifications of CTK 401

Page 4

LCD

Output

Power Amp.

—		TA8248K
2		TA8248K
2		IC101
—		IC101
—
		VC VCC DVDD
	DC + 9 V IN	Power Supply Circuit
		Power Supply Circuit
		Q101 ~ Q103, D104

BLOCK DIAGRAM

COM1 ~ COM16

LCD Driver

SED1278F0A

LSI3

SEG1 ~ SEG40

RS

DB4 ~ DB7R/W KO8 ~

E KO12

Filter (L)

Q104

Filter (R)

Q105CPU MSM 6755B-17

LSI1

APO

ButtonsKeyboard

KI0 ~ KI6

KO0 ~ KO7

MD0 ~ MD7

ROM(2M-bit)

UM23C2101M

MA0 ~ MA17

7384/Q

LSI2

Reset IC	Oscillator
IC1	X1, Q1

Image 4

Contents CTK-401 Contents General SpecificationsElectrical Block Diagram KEY Matrix Circuit DescriptionNomenclature of Keys CPU LSI1 MSM6755B-17 LCD Driver LSI3 SED1278F0A LvccPower Amplifier IC101 TA8248K Filter BlockAdjustment Main PCBMajor Waveforms Printed Circuit Boards Schematic Diagrams Sub PCB JCM442-MA2M Keyboard PCBs KDM4910K-KY1M/KY2M LCD SegmentExploded View Parts List Keyboard PCBs MA0600571A