Failure Diagnosis Method - Hitachi RCUE40AG2 Service Manual

Troubleshooting

5.2.3. Failure diagnosis method

General check of failure diagnosis.

In the case of no segment indication, unit can not operate.
Is 380-415V supplied
to the unit?:
Is 220-240V supplied to
transformer primary side?
Is 30V in PIN1~PIN2,
16.3V in PIN3~PIN4,
19.6V in PIN5~PIN6 of the
printed circuit board for
CPU (PCB ) connector
c
CN2A?
Is 26.7V in PIN1~PIN2,
17.6V in PIN3~PIN4,
17.6V in PIN5~PIN6 of the
printed circuit board for
CPU (PCB ) connector
c
CN2B?
Is voltage in each test PIN of printed
circuit board for CPU
5 V part:
VCCO5-GND1, VCCO5N-GND1
V5B-GND1, VCCR-GND1
+15V part:
VCC15T-GND1 (only more than 2 cycles unit)
- 15V part:
VCC15T-GND1
24V part:
VCC24-GND1
VCC24T-GND1
Are connector FCN1, FCN2 on the printed
circuit board for CPU (PCB
Circuit Board for Display and Operation
(PCB , PCB ) correctly connected and
A B
checked loose connection?
pag. 111
SMGB0003 rev.0 - 01/2007
No
Yes
No
Is fuse broken?
Yes
Is R phase or S
phase failure?
No
Check the power
source switch
Yes
No
Check the power
source switch
Yes
Yes
) and Printed
C
Yes
Check the power
source switch
Yes
Replace fuse
No
Yes
Wiring check
and repair
No
Wiring check
Yes Yes
transformer
No
Wiring check
Connector check
Yes
Replace
transformer
No Wiring check
Connector check
Power Source Circuit
No
Malfunction
Replace Printed Circuit
Board for CPU (PCB
No
Connector Repair
Check Printed Circuit
Board for Display and
Operation (PCB
PCB
Check Printed Circuit
Board for CPU (PCB
Replace
)
C
,
A
)
B
)
C
5 5