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5-4 No Vertical Scan (Raster is one horizontal line)
No Vertical Scan
Check I301 voltage of
pin 1 is 12V, pin 4 is
-12V, pin 2 is 35V?
Yes
Check
pin 5 O/P waveform at
I301
Yes
Check
pin 6, 7 of I301
waveform
Still no vertical scan
Check or replace CRT
Ckeck or replace
No
I301.
Check R312, R307,
No
R306, R313
No
Replace I401
VM77S
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