Pcb View And Major Waveforms - Casio M-300 Service Manual

A 50ns
1
Px10
˜
CH1 1V
1 Clock pulse COSI
MSM6387-22 pin 9

PCB VIEW AND MAJOR WAVEFORMS

2 3 1
X101
5
R125
R126
R129
R127
C115
R115
E Q102
B
R114
R123
R113
C117
R119
R112
C116
R118
R111
R117
R116
R120
R110
R121
R122
R124
LSI101 D104
JCM547-MA1MA
JA
JCM547-MA1M A
13 JA 1
D105
1
13
A 2ms
2
CH1
3
Px10 Px10
CH1 5V CH2 5V
2 Key scan signal KO0
MSM6387-22 pin 30
3 Key scan signal KO1
MSM6387-22 pin 29
6 7
5
4
D102
C106
R105
R106
75
75
75
75
IC101 C103
No.
No. 3
D106 D107 D108 D109 D110 D111 D112
A 2ms
4
CH1
CH2 5
Px10 Px10
˜
˜
CH1 . 1V CH2 . 1V
4 Sound signal output
MSM6387-22 pin 5
5 Filter output
Emitter of Q101
Tone: Flute
Key: A4
Volume: Maximum
— 5 —
J101
L101
R101
D101
PS-Q
PS-BL
L102
LED101
R102
195
6
CH1
7
CH2
Px10 Px10
˜
CH1 . 1V CH2 . 5V
6 Power amp input
AN8053N pin 6
7 Power amp output
AN8053N pin 1
A 2ms
CH1
˜