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5.5 Abnormal OSM display adjust problem

Check the input TTL level whether was changed

when pressed function keys on the P306 pin 4, 5

(normal is high level, when push buttom, generated

Failure Point

I305 is failure.

5. Troubleshooting (continued)

low level plus)

Check the input TTL level of I305

pin89, 90 whether was changed

when pressed function keys.

(Refer to Table 1)

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 among P306 pin4, pin5; R369 and I305

pin90.

2) Printed wire broke among P306 pin5,R372, and I305 pin89.

3)C386,C388 ,C389,C390 are short.

ACER X223W

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