Checking The Operation Of Cpu - Acer AL702 Service Manual

11. Checking the operation of CPU

Is there +5.0V supply on I303 pin 44
OK
Is 12MHz clock input to I303 pin 21
OK
Check the input of 5V "H" pulse from
I310 pin 4 are same as I303 pin 10.
OK
Page 14
NG
Printed wire broke between output of FB320 and I300 power supply pin.
and 20 at TTL level?
NG
(14 msec Typ)
NG
1) Printed wire broke between I310 pin 4 and I303 pin 10.
I303 failure.
Failure point
Failure point
X301 failure.
Failure point
A L C502
Trou bl e Sh ooti ng