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1.3. FAILURE DIAGNOSIS METHOD
1.3.1.
GENERAL CHECK OF FAILURE DIAGNOSIS.
In the case of no segment indication, unit cannot operate.
Is 220-240V 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 CN2A
c
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 CN2B
c
and CN2C
Is voltage in each test PIN of printed circuit board
for CPU
5 V part
+15V part
- 15V part
24V part
Are connector FCN1, FCN2
on the printed circuit board for
CPU (PCB
) and Printed
C
Circuit Board for Display and
Operation (PCB
correctly connected and
checked loose connection?
No
Yes
No
Yes
No
Yes
No
Yes
VCCO5-GND1
VCCO5N-GND1
V5B-GND1
VCCR-GND1
VCC15T-GND1
VCC15T-GND1
VCC24-GND1
VCC24T-GND1
Yes
No
, PCB
)
A
B
Yes
TROUBLESHOOTING
Check the power
source switch
Yes
Is fuse broken?
No
Yes
Is R phase or S
phase failure?
No
Yes
Is the wiring of
transformer broken?
No
Yes
Is the wiring of
transformer broken?
No
No
1
/3
Replace fuse
Wiring check
and repair
Wiring check
Replace
transformer
Wiring check
Connector check
Replace
transformer
Wiring check
Connector check
Power Source Circuit
Malfunction
Replace Printed
Circuit Board for
CPU (PCB
)
C
Connector Repair
Check Printed
Circuit Board for
Display and
Operation (PCB
,
A
PCB
)
B
Check Printed
Circuit Board for
CPU (PCB
)
C
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