Casio CTK-401 manual Circuit Description, KEY Matrix, Nomenclature of Keys

Page 5

CIRCUIT DESCRIPTION

KEY MATRIX

 

KI0

KI1

KI2

KI3

KI4

KI5

KI6

 

 

 

 

 

 

 

 

KO0

C2

G#2

E3

C4

G#4

E5

C6

 

 

 

 

 

 

 

 

KO1

C#2

A2

F3

C#4

A4

F5

 

 

 

 

 

 

 

 

 

KO2

D2

A#2

F#3

D4

A#4

F#5

 

 

 

 

 

 

 

 

 

KO3

D#2

B2

G3

D#4

B4

G5

 

 

 

 

 

 

 

 

 

KO4

E2

C3

G#3

E4

C5

G#5

 

 

 

 

 

 

 

 

 

KO5

F2

C#3

A3

F4

C#5

A5

 

 

 

 

 

 

 

 

 

KO6

F#2

D3

A#3

F#4

D5

A#5

 

 

 

 

 

 

 

 

 

KO7

G2

D#3

B3

G4

D#5

B5

 

 

 

 

 

 

 

 

 

KO8

+

0

Tempo

Tempo

Volume

Volume

Down

Up

Down

Up

 

 

 

 

 

 

 

 

 

 

 

 

KO9

3

2

1

Start/

Synchro/

Chord

Accomp

Stop

Fill-in

Book

Volume

 

 

 

 

 

 

 

 

 

 

 

 

KO10

6

5

4

Transpose/

Song

Rhythm

Tone

Tune

Bank

 

 

 

 

 

 

 

 

 

 

 

 

 

 

KO11

9

8

7

Fingered

CASIO

Normal

Power Off

Chord

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

KO12

FF

Right

Play/

Stop

Left

Rewind

 

Pause

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NOMENCLATURE OF KEYS

C#2 D#2

F#2 G#2

A#2

C#3 D#3

F#3 G#3

A#3

C#4 D#4

F#4 G#4

A#4

C#5 D#5

F#5 G#5

A#5

C2

D2

E2

F2

G2

A2

B2

C3

D3

E3

F3

G3

A3

B3

C4

D4

E4

F4

G4

A4

B4

C5

D5

E5

F5

G5

A5

B5

C6

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Contents CTK-401 Contents Electrical SpecificationsGeneral Block Diagram Nomenclature of Keys Circuit DescriptionKEY Matrix CPU LSI1 MSM6755B-17 Lvcc LCD Driver LSI3 SED1278F0AFilter Block Power Amplifier IC101 TA8248KMain PCB AdjustmentMajor Waveforms Printed Circuit Boards Schematic Diagrams Sub PCB JCM442-MA2M Keyboard PCBs KDM4910K-KY1M/KY2M Segment LCDExploded View Parts List Keyboard PCBs MA0600571A