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6-2. Vertical
40Vp-p
Unstable
picture
Is the
12Vdc
line voltage
correct?
No
Is the
pulse of pin 4, 6 of
the IC401
correct?
No
Is the output
of pin 12,13 of IC501
all normal?
No
Check the IC501 and
its ambient circuit
21
Yes
Refer to P. S. U
Yes
Trouble in
vertical D. Y
Yes
Check IC401 and
its ambient circuit
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