NEC MultiSync FP1350 Service Manual page 121

3-2. Vertical
Check V sync
NG
OK
OK
OK
• V OSC/DEF circuit failure (see item 7).
• Digital control circuit failure (see item 12).
Measure at CN-AF 7 pin (VD) on the VIDEO PWB (PWE-567A)
Check the input V sync
NG
Signal cable failure
Check the output pulse
NG
Q7Y3, Q7Y4, Q7Y7, Q7Y8, Q734, Q735, IC731 and their ambient
circuit failure on the VIDEO PWB (PEW-567A).
IC7A1 and their ambient circuit failure on the VIDEO PWB (PWE-567A).
Check the sync pulse at Mini D-SUB 14pin on the VIDEO
PWB (PWE-567A).
Check the pulse (VD) at IC731 21 pin on the VIDEO PWB
(PWE-567A).
7-9