Casio CTK-750 manual Circuit Description, Key Matrix

Page 6

CIRCUIT DESCRIPTION

Key Matrix

 

KC0

KC1

KC2

KC3

KC4

KC5

KC6

KC7

FI0

C2

1

C#2

1

D2

1

D#2

1

E2

1

F2

1

F#2

1

G2

1

SI0

C2

2

C#2

2

D2

2

D#2

2

E2

2

F2

2

F#2

2

G2

2

FI1

G#2

1

A2

1

A#2

1

B2

1

C3

1

C#3

1

D3 1

D#3

1

SI1

G#2

2

A2

2

A#2

2

B2

2

C3 2

C#3

2

D3

2

D#3

2

FI2

E3

1

F3

1

F#3

1

G3

1

G#3

1

A3

1

A#3

1

B3

1

SI2

E3

2

F3

2

F#3

2

G3

2

G#3

2

A3

2

A#3

2

B3

2

FI3

C4

1

C#4

1

D4

1

D#4

1

E4

1

F4

1

F#4

1

G4

1

SI3

C4

2

C#4

2

D4

2

D#4

2

E4

2

F4

2

F#4

2

G4

2

FI4

G#4

1

A4

1

A#4

1

B4

1

C5

1

C#5

1

D5

1

D#5

1

SI4

G#4

2

A4

2

A#4

2

B4

2

C5

2

C#5

2

D5

2

D#5

2

FI5

E5

1

F5

1

F#5

1

G5

1

G#5

1

A5

1

A#5

1

B5

1

SI5

E5

2

F5

2

F#5

2

G5

2

G#5

2

A5

2

A#5

2

B5

2

FI6

C6

1

C#6

1

D6

1

D#6

1

E6

1

F6

1

F#6

1

G6

1

SI6

C6

2

C#6

2

D6

2

D#6

2

E6

2

F6

2

F#6

2

G6

2

FI7

G#6

1

A6

1

A#6

1

B6

1

C7

1

 

 

 

 

 

 

SI7

G#6

2

A6

2

A#6

2

B6

2

C7

2

 

 

 

 

 

 

Note: Each key has two contacts, the first conatct 1 and second contact 2 .

Key

 

FI

Second contact 2

First contact 1

 

KC

 

SI

— 4 —

Image 6
Contents CTK-750 Contents Specifications GeneralReplacing the DSP HG51A115A01FD ElectricalBlock Diagram UPD6376CXCircuit Description Key MatrixButton Matrix Reset CircuitNomenclature of Keys MidiCPU HD6433298A18P Pin No Terminal In/Out FunctionGate Array UPD65005C-578 Digital Signal Processor HG51A115A01FD Block diagram of DSP and DAC circuit Key Touch LSI HG52E35P Filter Block Name Voltage For operation Power Amplifier LA4620Power Supply Circuit AvddWiring Diagram M5712-CN1MMajor Waveforms Page PCB View and Major Check Points Schematic Diagrams Console PCB M5712-CN1M Keyboard PCBs M615T-KY1M, KY2M Exploded View M5218APR IC Lead Identification and Internal DiagramS8053ANO PC900VQ2 2SD1762E,F Q4 2SB1274 EB C EBe C B Parts List N N FOB Japan Code No Parts Name Specification Yen Unit Price Lower Case Screws MA0300941A