5 Troubleshooting
5-10
CF21M*
5-1-18 Micom Failure
IC201 Pin 13 input is over 4.2V?
IC201 Pin 32 and 33
inputs are right?
Check X201, C203 and C204.
Yes
Yes
No
Check IC650.
No
IC201 Pin 40 input is High Active?
Check and replace IC202.
Yes
No
All in/output values are right?
Replace IC201.
Yes
No
Done.
16 17
WAVEFORMS
16
3.42 V (IC201, #33)
CH1 P-P = 3.42 V
CH1 RMS = 2.500V
17
3.16 V (IC201, #32)
CH1 P-P = 3.16 V CH1 RMS = 2.560 V
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 ...
