5 Troubleshooting
CF21M*
5-3
5-1-4 H_Deflection Failure
IC402 Pin 6 waveform is right?
1. Appear the Voltage 12V
DC
at
IC402 Pin 7 replace R451.
2. Check IC402 Pins 6~5, 7~6.
3. Replace IC402.
Yes
No
Q454 drain
waveform is right?
Check Q451, Q452, Q453,
ZD450, R467, D456.
Yes
No
Q401 gate, drain
waveforms are right?
Check Q250, Q251, IC250
Check +19V line.
Yes
No
Q402 base, collector
waveforms are right?
Check and replace D402 and Q402.
Check DY connector connection.
No
2
3
4
6
5
7
WAVEFORMS
2
IC402, #6
CH1 P-P = 10.96 V CH1 RMS = 6.180 V
3
Q454, Drain
4
Q401, Gate
CH1 P-P = 11.6 V
CH1 RMS = 6.944V
5
Q401, Drain
6
Q402, Base
7
Q402, Collector
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 ...