— 13 —
MAJOR WAVEFORMS
1
Clock signal B1
Test point T5
2
Clock signal B2
Test point T6
7
Key common signal KC0
JM connector pin 9
8
Key common signal KC1
JM connector pin 8
3
MNI signal
JM connector pin 18
4
APOFF signal
JS connector pin 12
5
LED common signal L23
JN connector pin 1
6
LED common signal L22
JN connector pin 2
Key : C7
1
2
3
4
7
8
9
0
5
6
A
B
A
Sound signal (R)
Test point T1
B
Sound signal (L)
Test point T2
Tone : French horn, Volume : Maximum,
Touch speed : Maximum, Reverb : Stage
Key : A4
9
CE signal for ROM
LSI3 LH536PNV pin 12
0
CE signal for working RAM
LSI4 TC55257DFL pin 20
Summary of Contents for CTK-620L
Page 16: ...15 SCHEMATIC DIAGRAMS Main PCB JCM447 MA1M AT 49 30M 4 11 1 12 7 8 3 5 6 2 10 9...
Page 17: ...16 Sub PCB JCM447 MA2M 5 6 V 5 6 V 5 6 V 0 7 V 2 V 50V 1...
Page 18: ...17 Console PCB JCM447 CN1M...
Page 19: ...18 Console PCB JCM447 CN2M...
Page 20: ...19 Display PCB JCM447 LCD1M...
Page 21: ...20 Keyboard PCBs JCM618T KY1M KY2M...
Page 22: ...21 LED PCB JCM447 LD1M...
Page 23: ...22 LED PCB JCM447 LD2M...
Page 24: ...23 LED PCB JCM447 LD6...
Page 25: ...24 Console PCBs JCM447 CN3M CN4M...
Page 26: ...25 Console PCB JCM447 CN5M...
Page 27: ...26 LED PCBs JCM447 LD4M LD5M...
Page 28: ...27 LED PCB JCM447 LD3M...
