Acer AL1702 Instrukcja serwisowa - Strona 19

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Acer AL1702 Instrukcja serwisowa

5. Abnormal OSM display adjust problem

Check the input TTL level whether was changed when
pressed function keys on the P308 pin3, 4, 5, 6. (normal is
high level, when push buttom, generated low level plus)
Check the input TTL level whether was changed when
pressed function keys on the I307 pin1, 2, 41, 42. (normal
is high level, when push buttom, generated low level plus)
Failure Point
I307 is failure.
NG
OK
NG
OK
Failure Point
1) Function key wire disconnection.
2) Function key wire is failure.
3) Function key board is failure.
Failure Point
1) Printed wire broke between P308 pin3 and I307 pin41.
2) Printed wire broke between P308 pin4 and I307 pin2.
3) Printed wire broke between P308 pin5 and I307 pin1.
4) Printed wire broke between P308 pin6 and I307 pin42.
5) C404, C405, C406, C407 is short.
6) R367, R368, R369, R370 is short or open.
AL1702
Page 17