Checking The Operation Of Cpu - NEC NMV 1700V Service Manual

11. Checking the operation of CPU

Page 14
Is there +5.0V supply on I302 pin 44
NG
OK
Printed wire broke between output of FB331 and I302 power supply pin.
Is 24MHz clock input to I302 pin 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
1) Printed wire broke between I302 pin 10 and I306 pin 1.
2) I208 failure.
I302 failure.
Failure point
Failure point
X301 failure.
Failure point
NMV 1700V
Trouble Shooting