NEC MultiSync FP1370 Service Manual page 110

CONTINUE1 CONTINUE2
OK
NG
Check the abnormal picture. (see item 5)
Check the horizontal input trigger.
Check the unstable picture. (see item 3-1)
NG
Check the Q502 gate pulse.
OK
･IC501 failure.
NG
･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.
･Q5F1 and its ambient circuit failure.
･Q5F2 and its ambient circuit failure.
･IC2001 and its ambient circuit failure.
･T5R1 (FBT) failure.
･VR5T1 and its ambient circuit failure.
･IC5W1 and its ambient circuit
Check the horizontal sync pulse (HD) at CN-DSB pin 4 on the DEF
PWB (PWE-624)
Its amplitude is approx.3Vp-p at Q502 gate on the OSC PWB (PWE-567B).
7-22
CONTINUE3
NG