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Fusing Section Main Unit Theory of Operation
2-112
II Composition/Operation
16.4 Malfunction detection
16.4.1 Fusing Unit malfunctions
• The following table lists the seven types of malfunctions as they relate to the Fusing Unit.
16.4.2 Fusing Motor abnormal rotation detection control
• The condition of the Fusing Motor (M4) while it is rotating is monitored and, if an abnor-
mal rotation is detected, “Fusing Motor abnormal rotation 060” is displayed.
A. Detection operation
• The machine determines that the Fusing Motor (M4) is in a good rotating condition if the
motor maintains a steady-state rotating condition continuously for a predetermined
period of time or more during its stable rotation.
• The Fusing Motor is considered to be abnormal if it fails to rotate in a steady state even
after the lapse of a predetermined period of time during its stable rotation.
• The Fusing Motor is considered to be abnormal if a Fusing LOCK signal is not detected
even after the lapse of a predetermined period of time after the machine has determined
that the motor rotates in a steady state.
Malfunction code Description Defective component
0060 Fusing Motor abnormal rotation Fusing Motor (M4)
0500
Warm-up failure Heating Roller Heater Lamp (H1)
Open-circuited thermistor (incorrect
installation)
Heating Roller Thermistor (TH1)
Abnormal temperature increase rate
0501
Warm-up failure Fusing Pressure Roller Heater Lamp (H2)
Open-circuited thermistor (incorrect
installation)
Fusing Pressure Roller Thermistor (TH2)
0510 Abnormally low temperature Heating Roller Heater Lamp (H1)
0511 Abnormally low temperature Fusing Pressure Roller Heater Lamp (H2)
0520 Abnormally high temperature Heating Roller Heater Lamp (H1)
0521 Abnormally high temperature Fusing Pressure Roller Heater Lamp (H2)
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