NEC MultiSync FP1350 Service Manual page 134

CONTINUE1 CONTINUE2
OK
Check the abnormal picture. (see item 5)
NG
Check the horizontal input trigger.
NG
Check the unstable picture. (see item 3-1)
OK
Check the Q502 gate pulse.
NG
• IC501 failure.
• Q504, Q505 or its ambient circuit failure.
• R503, R504, R507, R508 or C509 failure.
• Digital control circuit failure. (see item 12)
OK
Q501, Q502 or their ambient circuit failure.
Check the horizontal sync pulse (HD) at CN-DSB pin 4 on the DEF
PWB (PWE-568).
Its amplitude is approx.3Vp-p at Q502 gate on the OSC PWB (PWE-567B).
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