Checking The Resolution Change Ic Movement - HP VF15 Service Manual

8. Checking the resolution change IC movement

Is there +3.3V supply on I302 pin 2, 20, 37, 53, 67, 81, 97, 111, 129, 141, 146, 150, 173, 181,
OK
Is there +2.5V supply on I303 pin 176, 182, 188, 26, 88, 134, 203, 153, 155 and 199
OK
Is 14.318MHz clock input to I303 pin
OK
Is Low Reset pluse signal input to
I303 pin 5 about 10 mesc?
OK
Failure point
I303 failure
Print wire broke between I305 pin 4
187, 193, 196, 164, 168, 172 and 160.
NG
Proceed "Checking the DC/DC converter circuit section".
NG
Proceed "Checking the DC/DC converter circuit section".
152 at TTL level?
Is 14.318MHz clock output from
X301
NG
at TTL level?
OK NG
Failure point
Print wire broke between X301 and
I303 pin 152.
Check the output Low Reset signal
NG
from I305 pin 4.
NG Is 5.0V supplied to I305 pin 5?
OK
Failure point
and I303 pin 5.
vf15 / FP15 / f1523 / FP5315
Failure point
X301 failure
Failure point
NG
OK
Power source
Failure point
I305 failure
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