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12. Checking the operation of CPU
Is the +3.3V supply on CPU of I306
N G
O K
Printed wire broke between I306 and I312 output circuit
Is 10MHz clock input to I306 pin 11
and 12 at TTL level
N G
O K
Check the Reset circuit after CPU 3.3V
stable than I306 pin 10 delay more than
20ms Low level stage and from Low
level change to 3.3V High level
N G
O K
1) Printed wire broke between I306 pin 10 and I309 pin 6 output circuit
2) I309 failure
I306 failure.
Failure point
Failure point
X302 failure.
Failure point
NEC-FA150ATUA
Trouble Shooting
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