6-12
8. Checking the resolution change IC movement
Is there +3.3V supply on I306 pin 77, 79, 84, 96, 92, 88, 8, 129, 136,
139, 137, 143, 11, 21, 58, 108, 149, 12, 33, 40 and 65.
OK
NG
Proceed "Checking the DC/DC converter circuit" section.
Is 20MHz clock input to I306 pin 141 at TTL level?
OK
NG
Is 20MHz clock output from X301 at TTL level?
OK
NG
Failure point
Print wire broke between
X301 and I306 pin 141.
Failure point
X301 failure.
Is +5.0V supplied to I306 pin 100 at
High level?
OK
NG
Check the output of 5.0V "H" pulse from I301 pin 6.
OK
NG
Is 5.0V supplied to I301 pin 7?
Failure point
Print wire broke between
I301 pin 6 and I306 pin 100.
OK
NG
Failure point
1) FB318 failure
2) Power source
Failure point
I301 failure.
Failure point
I306 failure.
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