Check The Power Supply - NEC -FA150ATUA Service Manual

14.5 Check the power supply

Is the 5V input to J201 pin 1, 2
N G
1) USB 5V short to ground
O K
2) USB DC cable disconnection
3) Proceed 10 "No Power On (II)"
Is the 5V input to Q203 (E) and I203
pin 2
N G
1) L214 open
O K
2) Printed wire broke between J201 and
Q203 (E) with I203 pin 2
Is High-Level output from I203 pin 1
N G
O K
Is Low-Level at Q204 pin 1 (c)
N G
1) R233 open
O K
2) Q204 Failure
Is the 5V output from Q203
N G
O K
Printed wire broke between Q203
output and I201 pin 1
Failure point
Failure point
Failure point
I203 failure
Failure point
Failure point
Q203 failure
NEC-FA150ATUA
Trouble Shooting