7-8
3. UNSTABLE PICTURE
3-1. Horizontal
Measure at CN-AF 5 pin (HD) on the VIDEO PWB (PWE-567A)
NG
Check the sync pulse at Mini D-SUB 13pin on the VIDEO
PWB (PWE-567A).
NG
OK
Check the pulse (HD) at IC731 22 pin on the VIDEO PWB
(PWE-567A).
NG
OK
OK
Check H sync
Check the input H sync
Signal cable failure
Check the output pulse
Q7Y1, Q7Y2, Q7Y5, Q7Y6, 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).
• H OSC/DEF/HV circuit failure (see item 6).
• Digital control circuit failure (see item 12).
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