Checking The Interface Circuit Of Sync Signal; Checking The Control Circuit Of Horizontal Sync Pulse; Checking The Control Circuit Of Vertical Sync Pulse - NEC MultiSync 20WGX2 Series Service Manual

7. Checking the Interface Circuit of Sync Signal

7.1 Checking the Control Circuit of Horizontal Sync Pulse

Check the horizontal sync signal on I308 pin 132
Process "8. Checking the resolution change IC movement"

7.2 Checking the Control Circuit of Vertical Sync Pulse

Check the vertical sync signal on I308 pin 133 TTL
Process "8. Checking the resolution change IC
TTL level.
OK
section.
level.
OK
movement" section.
NG
1) Video cable may have failed.
2) Printed wire broke between P301 pin 13
and I308 pin 132.
3) FB302, R307 open.
NG
1) Video cable may have failed.
2) Printed wire broke between P301 pin 14
and I308 pin 133.
3) FB302, R307 open.
6 - 9
Failure point
Failure point