12. Checking the operation of CPU
Is there +5.0V supply on I201 pin 44
NG
OK
Is 20MHz clock input to I201 pin 20 and 21 at TTL level?
NG
OK
Check the input of 5V "H" pulse from I201 pin 10 are same as I208 pin 1.
(350 msec Typ)
NG
OK
I201 failure.
Printed wire broke between output of FB106 and I201 power supply pin.
Failure point
X201 failure.
1) Printed wire broke between I201 pin 10 and I208 pin 1.
2) I208 failure.
Failure point
Failure point
6-17