Major Waveforms - Casio CTK-480 Service Manual

1
CH1 5V
1 RESET signal
IC102 pin 1
3
4
CH1 5V CH2 5V
3 Key scan signal KO10
MSM6755B-06 pin 76
4 Key scan signal KO11
MSM6755B-06 pin 77
7
8
CH1 1V CH2 1V
7 Sound signal output (R-ch)
MSM6755B-06 pin 45
8 Sound signal output (R-ch)
Q110 2SC1740SQ Emitter

MAJOR WAVEFORMS

0.1 s
CH1
BWL
10 µs
CH1
CH2
BWL
1ms
CH1
CH2
BWL
Tone: Flute Ensemble (58)
Key: A3
Volume: 7
— 8 —
2
CH1 1V
2 Main clock pulse
MSM6755B-06 pin 32
5
6
CH1 1V CH2 1V
5 Sound signal output (L-ch)
MSM6755B-06 pin 47
6 Sound signal output (L-ch)
Q109 2SC1740SQ Emitter
9
0
CH1 1V CH2 1V
9 Sound signal output (R-ch)
LA4598 pin 3
0 Sound signal output (L-ch)
LA4598 pin 12
20 µs
CH1
BWL
1ms
CH1
CH2
BWL
1ms
CH1
CH2
BWL