5 Troubleshooting
5-6
CF21M*
5-1-11 Tilt Failure
IC201 Pin 5 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
5-1-12 V Deflection Failure
Is 14V at IC301 Pin 2?
Is -14V at IS301 Pin 5?
IC250 Pin 23 output exists?
The waveform is right?
Check and replace IC250.
Yes
Yes
No
Check and replace R312, R316.
Refer to 5-1-1 No Power supply.
No
IC301 Pin 6 output exists?
The waveform is right?
Check and replace some
parts around IC301.
Yes
No
Check V DY connector connection.
10
11
WAVEFORMS
10
IC250, #23
11
IC301, #6
Summary of Contents for CF21M
Page 7: ...CF21M 6 1 6 Exploded View and Parts List ...
Page 17: ...10 Schematic Diagrams 10 6 CF21M 1 368 V IC601 1 ...
Page 19: ...10 Schematic Diagrams 10 8 CF21M 19 IC103 5 24 15 CRT Socket Red Green Blue 20 R G B Video ...
Page 21: ...10 Schematic Diagrams 10 10 CF21M Memo ...
Page 22: ...Memo 9 Wiring Diagram 9 2 CF21M ...
Page 23: ...Memo 8 Block Diagrams 8 2 CF21M ...
Page 48: ...Memo 7 Electrical Parts List 7 26 CF21M ...
Page 49: ...7 Electrical Parts List CF21M 7 27 Loc No Code No Description Specification Remarks ...
