Casio CTK-750, Service Manual

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Nomenclature of Keys
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
F3 G3 A3 B3 C4 D4 E4 F4 G4 A4 B4 C5 D5 E5 F5 G5 A5 B5
C6
D#3
C2 D2
E2
F2
G2
A2 B2 C3 D3
E3 B6 A6 G6 F6 E6 D6
C7
C#3 A#2 G#2 F#2 D#2 C#2 A#6 G#6 F#6 D#6
C#6
Button Matrix
KI1 KI2 KI3 KI4 KI5 KI6 KI7
KO0 Split Layer Upper 1 Lower 1 Lower 2 Upper 2
KO1 Transpose Tune MIDI Jack Rhythm Tone Play Style
KO2
Track 4
Chord 1
Track 5
Chord 2
Track 6
Chord 3
Track 2
Rhythm Track 3
Bass
KO3 3 6 9 Demo
Touch
Responce
Digital
Effect
Resistration
KO4 2 5 8 Track 1 1 4 7
KO5
Accomp.
Volume
Song
Memory
Accomp. Track 0 - +
KO6
Synchro/
Ending
Variation
/Fill-In
Normal/
Fill-In
Intro F D B
KO7 Mode A C E
Start/
Stop
Tempo
Down
Tempo
Up
Reset Circuit
VDD
Battery set
RESET
CPU
HD6433298A18P
Reset IC
S8053ANO
Working Strage RAM
HM62256ALP-10
Gate Array
UPD65005C-578
DSP
HG51A115A01FD
Key Touch LSI
HG52E35
DVDD
DVDD
VDD
VDD
VDD
-RESET
WR
-SRAM
POWER
From power switch