Hitachi SAMURAI Series Service Manual page 130

4. Troubleshooting
Method for fault diagnosis
4.9 Method for fault diagnosis
Summary of checks for fault diagnosis
Is 400V supplied to the unit?
Is 230V supplied to
transformer (TF
Is 22.1V in PIN1~PIN2,
15.6V in PIN3~PIN4, 15.8V
in PIN5~PIN6 of the printed
circuit board for CPU (PCBc)
Is 22.1V in PIN1~PIN2,
15.6V in PIN3~PIN4, 15.8V
in PIN5~PIN6 of the I/O printed
circuit board (PCBd) connector
Is 20.4V in PIN1~PIN2, I/O printed
circuit board (PCB
Are connector CN1, on the printed circuit board
for CPU (PCB ), connector CN21 on the I/O printed
c
circuit board (PCBd) and Printed Circuit Board for Display
and Operation (PCB
checked loose connection?
122
SMGB0082 rev.1 - 07/2015
No
Yes
No
) primary side?
1
Yes
No
connector CN2A?
Yes
No
CN56 and CN57?
Yes
No
) connector CN55?
d
Yes
) correctly connected and
A
Yes
Check the power
source switch
Yes
Is fuse broken?
No
Yes
Is R phase or S phase
failure?
No
Yes
Is there power source?
No
Yes
Is there power source?
No
Yes
Is there power source?
No
No
Replace fuse
Replace transformer
Wiring check.
Connector check
Replace transformer
Wiring check.
Connector check
Replace transformer
Wiring check.
Connector check
Replace transformer
Wiring check.
Connector check
Connector repair
Check printed circuit
board for CPU (PCBc),
and the I/O printed
circuit board (PCBd)