11. Checking the CPU Operation
Is there +5.0V supply on I302 pin 44.
NG
OK
Is 24MHz clock input to I302 pins 20 and 21 at TTL level?
NG
OK
Check the input of 5V "H" pulse from I302 pin 10 are same as I306 pin 1.
NG
OK
I302 failure.
Printed wire broke between output of FB331 and I302 power supply pin.
Failure point
X301 failure.
1) Printed wire broke between I302 pin 10 and I306 pin 1.
2) I326 failure.
Failure point
Failure point
6-16