5 Troubleshooting
5-4
CF21M*
5-1-5 S Correction Failure
S1~S5 signals are right at
each frequency block?
Check S1 ~ S5 signal.
Refer to the S-corrction table page?
Check and replace
C411, C413, C414, C415, C416,
C417, C418, Q403 ~ Q407, Q408 ~ Q412
Yes
5-1-6 H_Lin. Failure
IC201 Pin 3 voltage varies with
different H_Lin. DAC values?
IC403 Pin 7, 8 voltage varies with
different H_Lin. DAC values?
Check +12 V line.
Check some parts around IC403.
Check L403.
Yes
Yes
No
IC402 Pin 6 output duty varies with
different H_Size DAC values?
Check some parts
around IC250, IC201.
Yes
No
Check and replace IC201.
No
Replace IC201.
No
5-1-7 Invariable H_Size
D250 Cothode voltage varies with
different H_Size DAC values?
Check and replace IC250, IC201.
No
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 ...
