5 Troubleshooting
5-10
720C/920C
5-1-17 Micom Failure
IC201 Pin 11 input is right?
IC201 Pins 13 and 14 inputs
are right?
Check X201, C204 and C205.
Yes
Yes
No
Check IC606.
No
IC201 Pin 18 input is right?
Check IC202.
Yes
No
All in/output values are right?
Replace IC201.
Yes
No
Done
1
2
1
3
1
2
3.42 V (IC201, #33)
CH1 P-P = 3.42 V
CH1 RMS = 2.500 V
1
3
3.16 V (IC201, #32)
CH1 P-P = 3.16 V
CH1 RMS = 2.560 V
WAVEFORMS
Summary of Contents for 720C
Page 33: ...720C 920C 6 1 6 1 720C Exploded View and Parts List ...
Page 34: ...720C 920C 6 2 6 2 920C Exploded View and Parts Lists ...
Page 80: ...R299 720C 920C 10 2 10 2 MICOM Parts Schematic Diagram ...
Page 81: ...720C 920C 10 3 10 3 Horizontal Vertical Processor Parts Schematic Diagram R265 C272 R262 ...
Page 83: ...R561 R562 R501 C530 L521 R523 R526 720C 920C 10 5 10 5 High Voltage Parts Schematic Diagram ...
Page 84: ...720C 10 6 1 10 6 1 720C Video Parts Schematic Diagram ...