Casio CTK-485 Service Manual

— 10 —
MAJOR WAVEFORMS
0.1 s
CH1
CH1 5V
BWL
1 RESET signal
IC 1 pin 1
1
20 µs
CH1
BWL
CH1 1V
2
2 Main clock pulse
MSM6755B-17 pin 32
10 µs
CH1
CH2
CH2
BWL
CH1 5V 5V
3 Key scan signal KO10
MSM6755B-17 pin 72
4 Key scan signal KO11
MSM6755B-17 pin 73
3
4
1ms
CH2
CH1
BWL
CH1 1V 1V
CH2
5 Sound signal output (L-ch)
MSM6755B-17 pin 47
6 Sound signal output (L-ch)
Q106 2SC1740SQ Emitter
5
6
1ms
CH1
CH2
BWL
CH1 1V
CH2 1V
1ms
CH1
CH2
BWL
CH1 1V 1V
CH2
7 Sound signal output (R-ch)
MSM6755B-17 pin 44
8 Sound signal output (R-ch)
Q107 2SC1740SQ Emitter
9
0
9 Sound signal output (R-ch)
LA4598 pin 3
0 Sound signal output (L-ch)
LA4598 pin 12
Tone: Flute Ensemble
Key: A3
Volume: 7
7
8

Casio CTK-485 Specifications

General

Brand	Casio
Model	CTK-485
Category	Electronic Keyboard
Language	English