Service manual

4.6 Abnormal OSM display adjust problem
Check the input TTL level w hether to
change when press the function keys on the P307
pin3, p in4 (normal is high level when to press button,
the level will be changed.)
Fa ilu r e Poin t:
1. Function key wire is disconnected.
2. Function key wire is defected.
3. Function key board is defected.
Check the input TTL level w hether to
change when press the function keys on I306 pin114
and pin115.
NG
OK
Fa ilu r e Poin t:
1. Printed wire broken between P307 pin2 and I306 pin114.
2. Printed wire broken between P307 pin3 and I306 pin115.
3. R368 C382 R369 C383 C 387,C388,C391 or
C392 is short.
4. R380,R383,R378 or R379 is open.
NG
Fa ilu r e Poin t:
I30 6 is failure
OK
4. Troubleshooting (continued)
19
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ACER AL1716W