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M-14
"50 FUSER MALF" is displayed
Possible cause
Step
Thermal fuse
1
Thermistor
2
Fixing heat
3
roller
Low-voltage
4
power supply
PCB
Main PCB
5
Note: When the printer has detected a fixing unit malfunction, do not power on for about 15
minutes.
Even if the power is on, the printer will shut off the power supply to the fixing heat roller
to prevent the fixing the unit from overheating.
M-15
"51 LASER BD MALF" is displayed
Possible cause
Step
Main PCB
1
Scanner harness
M-16
"52 SCANNER MALF" is displayed
Possible cause
Step
Main PCB
1
Scanner harness
Scanner unit
Check
Is the thermal fuse located in the fixing unit
conductive?
Remove the fixing unit from the printer and
measure the resistance between two pins of
the 2 pin connector on the fixing PCB. Is the
measured resistance within the range of
1.0 M
1.6M
(normal temperature)?
Is the fixing heat roller located in the fixing unit
conductive?
When the power is switched on, does the
voltage at connector pin P4-1 on the main
PCB go from 5V to 0V?
Make sure if:
The EP-ED cartridge is installed in the printer
correctly.
The upper cover of the printer is closed.
A paper-loaded cassette is mounted.
Check
Is the problem remedied when the power off
and on again?
Check
Is the problem remedied when the power off
and on again?
Result
No
No
No
Yes
No
Result
No
Result
No
VI - 17
Remedy
Replace the fixing unit.
Replace the fixing unit.
Replace the fixing heat roller.
Replace the low-voltage
power supply PCB assy.
Replace the main PCB assy.
Remedy
Replace the main PCB assy ,
the SCN harness 4P,SCN flat
cable 6P or the scanner unit.
Remedy
Replace the main PCB assy,
the SCN harness 4P, SCN flat
cable 6P or the scanner unit.
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Chapters
Troubleshooting
