No.
Definition
Symptom Possible Cause
The main motor does not reach its
operation speed within 0.7 second. Or,
the main motor remains out of its operation
speed for 0.7 second after reaching the
operation speed.
• Overload
• Defective main motor
541 A
Fusing thermistor open error
The fusing temperature remains lower
than the specified temperature by 20
degrees Celsius.
• Defective thermistor
• Incorrect installation of the thermistor
• Defective power supply unit
• Loose connectors
542 A
Fusing temperature warm-up error
The fusing temperature rises 7 degrees or
less in two seconds; and this continues 5
times consecutively. Or, the fusing
temperature is not detected within 25 or
35 seconds.
• Defective thermistor
• Incorrect installation of the thermistor
• Defective fusing lamp
• Defective power supply unit
543 A
Fusing overheat error 1
The fusing temperature detected by the
thermistor is 230°C or higher for one
second.
• Defective thermistor
• Defective power supply unit
544 A
Fusing overheat error 2
The fusing temperature detected by the
monitor circuit is 250°C or higher for one
second.
• Defective thermistor
• Defective power supply unit
545 A
Fusing lamp overheat error
After the fusing temperature reaches the
target, the fusing lamp remains on for 12
seconds.
• Defective thermistor
• Incorrect installation of the thermistor
• Defective power supply unit
546 A
Unstable fusing temperature
4. Troubleshooting
112
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