— 10 —
MAJOR WAVEFORMS
0.1 s
CH1
CH1
5V
BWL
1
RESET signal
IC 1 pin 1
1
20
µ
s
CH1
BWL
CH1
1V
2
2
Main clock pulse
MSM6755B-17 pin 32
10
µ
s
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
Summary of Contents for CTK-485
Page 12: ...11 PRINTED CIRCUIT BOARDS Main PCB JCM450 MA1M Top View Bottom View 1 2 7 5 3 4...
Page 13: ...12 Keyboard PCB KDM6111K KY1M Keyboard PCB KDM6111K KY2M Main PCB JCM450 MA2M 6 8 9 10...
Page 14: ...13 SCHEMATIC DIAGRAMS Main PCB JCM450 MA1M 1 2 7 5 3 4...
Page 15: ...14 Main PCB JCM450 MA2M 8 6 9 10 2 9 V 5 3 V 0 7 V...
