Service manual

22
TROUBLESHOOTING HINTS
5-2. Vertical
Unstable or
Abnormal picture
Is
13V DC line
correct?
Check PWR 13V
ambient circuit.
No
Yes
Is
the output
waveform of IC301
(pin 5)
normal?
Trouble in V.Sync line
or IC501 failure.
Yes
No
45Vp-p
Is the
output pulse
of IC501 (
pin 13 )
normal?
Yes
No
Check V.DY
and ambient circuit.
Check the IC301
or ambient circuit.