6-10
6.2 Checking the control circuit of vertical sync pulse
NG
Failure point
1) No separate sync output signal from the host.(Check the
host.)
2) Video cable may have failed.
3) Printed wire broke between J201 pin 14 and IC203 pin9
4) L209 or R213 open.
5) IC202 failure
OK
Proceed section 7
“
Checking the resolution
change IC movement
”
.
Check the vertical sync signal on IC203
pin9 at TTL level.