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7. Checking the interface circuit of sync signal
7.1 Checking the control circuit of horizontal sync pulse
7.2 Checking the control circuit of vertical sync pulse
Page 10
Check the horizontal sync signal on I315
pin L2 TTL level.
N G
1) Video cable may have failed.
2) Printed wire broke between P304 pin 13
O K
and I315 pin L2
3) FB305, R329 open
4) R330, C352 short
Process "Checking the resolution change IC
movement" section.
Check the vertical sync signal on I315 pin
K1 TTL level.
N G
1) Video cable may have failed.
2) Printed wire broke between P304 pin 14 and I315
O K
pin K1
3) FB328, FB304 open
4) R331, C353 short
Process "Checking the resolution change IC
movement" section.
B17AAU / B17ANU / B17AAY
Failure point
Failure point
Trouble Shooting
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