Casio CTK-631, Service Manual

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— 13 —
MAJOR WAVEFORMS
1 NMI signal
JD connector pin 1
2
APO signal
JH connector pin 6
5 Key scan signal KC0
JA connector pin 9
6
Key scan signal KC1
JA connector pin 10
3 Button scan signal PA0
JD connector pin 9
4
Button scan signal PA1
JD connector pin 8
9 DAC output (L-ch)
JH connector pin 9
0 DAC output (R-ch)
JH connector pin 8
A Sound signal (L-ch)
JK connector pin 4
B Sound signal (R-ch)
JK connector pin 5
7
RS signal PA4
JJ connector pin 4
8 R/W signal PA5
JJ connector pin 5
1
2
CH1
CH2
3
4
CH1
CH2
5
6
CH1
CH2
7
8
CH1
CH2
9
0
CH1
CH2
A
B
CH1
CH2
0.5 s
20 ms
50
µ
s 0.5 s
1 ms
1 ms
CH1: 5 V
–
CH2: 5 V
–
CH1: 5 V
–
CH2: 5 V
–
CH1: 5 V
–
CH2: 5 V
–
CH1: 5 V
–
CH2: 5 V
–
CH1: 50 mV
˜
CH2: 50 mV
˜
CH1: 50 mV
˜
CH2: 50 mV
˜
Power button ON
Power ON