Casio CTK-220L manual Circuit Description, KEY Matrix

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CIRCUIT DESCRIPTION

KEY MATRIX

 

KI0

KI1

KI2

KI3

KI4

KI5

KI6

KI7

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

1

2

3

4

Start/

Up

Volume

Stop

Down

 

 

 

 

 

 

 

KO9

5

6

7

8

9

Down

Volume

Synchro/

Down

Fill-In

 

 

 

 

 

 

 

K10

Tone

Rhythm

Song

Part

One Key

One Key

 

Demo

Bank

Select

 

 

 

 

 

 

 

 

K11

Step-1

Step-2

Step-3

 

Fingered

Casio

Normal

Off

 

Chord

 

 

 

 

 

 

 

 

LED MATRIX

 

LX0

LX1

LX2

LX3

LX4

LX5

LX6

LX7

LY1

D4

D3

C3

C2

G#2

F#2

D#2

C#2

LY2

C4

E3

B2

D2

A#2

C#3

D#3

F#3

LY3

B3

F3

A2

E2

D#4

C#4

A#3

G#3

LY4

A3

G3

G2

F2

C#5

A#4

G#4

F#4

LY5

E4

C5

D5

B5

D#5

F#5

G#5

A#5

LY6

F4

B4

E5

A5

C6

 

 

 

LY7

G4

A4

F5

G5

 

 

 

 

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-220L Contents General SpecificationsCPU LSI1 Block DiagramKEY Matrix Circuit DescriptionCPU LSI1 MSM6755B-13 Filter Block Major Waveforms Sub PCB KDM445-MA2M Printed Circuit BoardsSchematic 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