5 Troubleshooting
5-6
720C/920C
5-1-10 Tilt Failure
IC201 Pin 23 output duty varies
with different DAC values?
IC403 Pin 10, 11 output varies with
different DAC values?
Check and replace IC403.
Check and replace CRT.
Yes
Yes
No
Check and replace IC201.
No
Check tilt connector connection
5-1-11 V Deflection Failure
±14 V line is on?
IC261 Pin 23 output exists?
Check and replace IC261.
Yes
Yes
No
Refer to 5-1-1 No Power Supply
No
IC301 Pin 1 input exists?
Check R276 and R304.
Yes
No
IC301 Pin 6 output exists?
Check and replace some parts
around IC301.
Yes
No
Check V DY connector connection.
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 ...