Appendix 4: Troubleshooting
Abnormal OSM display adjust problem
Check the input TTL level whether to
change when press the function keys on the P307
pin3, pin4 (normal is high level when to press button,
the level will be changed.)
Failure Point:
1. Function key wire is disconnected.
2. Function key wire is defected.
3. Function key board is defected.
Check the input TTL level whether to
change when press the function keys on I306 pin114
and pin115.
NG
OK
Failure Point:
1. Printed wire broken between P307 pin3 and I306 pin114.
2. Printed wire broken between P307 pin4 and I306 pin115.
3. R368 C382 R369 C383 C387,C388,C391 or
C392 is short.
4. R380,R383,R378 or R379 is open.
NG
Failure Point:
I306 is failure
OK
8
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