Checking The Interface Circuit Of Sync Signal; Checking The Control Circuit Of Horizontal Sync Pulse; Checking The Control Circuit Of Vertical Sync Pulse - Elo TouchSystems ET17 XXL Series Service Manual

6.Checking the interface circuit of sync signal

6.1 Checking the control circuit of horizontal sync pulse

OK
Process "Checking the resolution change IC movement" section.

6.2 Checking the control circuit of vertical sync pulse

OK
Process "Checking the resolution change IC movement" section.
Check the horizontal sync signal on I303 pin 137 TTL level.
Failure Point
(1) Video cable may have failed.
NG
(2) Printed wire broke between P301 pin 13 and I303 pin 137
(3) FB302, R306,I302 open
(4) R309 , C305 short
Check the vertical sync signal on I303 pin 136 TTL level.
Failure Point
(1) Video cable may have failed.
NG
(2) Printed wire broke between P301 pin 14 and I303 pin 136.
(3) FB301, R304,I302 open
(4) R310 , C306 short
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