5-3.Horizontal Position - NEC MultiSync FP1350 Service Manual

5-2. Vertical Size
Check whether the amplitude (approx. 6Vp-p~10Vp-p) at CN-DSB pin 12
on the DEF PWB (PWE-568) varies by OSD vertical size control or not ?
NG
• IC501 or IC511 failure.
• Digital control circuit failure. (see item 12)
OK
Check whether the amplitude (approx. 6Vp-p~10Vp-p) at IC421 8 pin on
the DEF PWB (PWE-568) varies by OSD vertical size control or not ?
NG
IC421 or its ambient circuit failure.
OK
V OSC/DEF circuit failure. (see item 7)
5-3. Horizontal Position
Check the raster position.
NG
Raster centering circuit failure.
OK
• IC501 failure.
• Q504, Q505 or their ambient circuit failure.
• Digital control circuit failure. (see item 12)
v. size min.
Approx. 6Vp-p
7-13
v. saw wave
v. size max.
Approx.10Vp-p