Main Unit Theory of Operation Fusing Section
2-113
II Composition/Operation
16.4.3 Warm-up failure detection control
• The temperatures of the Heating Roller and Fusing Pressure Roller are monitored using
the Heating Roller Thermistor (TH1) and Fusing Pressure Roller Thermistor (TH2) during
a warm-up cycle. If an abnormal rise in temperature is detected, “warm-up failure 0500/
0501” is displayed.
A. Detection start timing
• At the start of the warm-up control
• At the start of the low temperature start control
• During rotation under the Fusing Pressure Roller deformation prevention control
B. Detection termination timing
• At the end of the warm-up control
• At the end of the low temperature start control
• At the end of the Fusing Pressure Roller deformation prevention control
• The detection reference temperature for the above control is reached.
C. Detection condition
• The temperatures of the Heating Roller and Fusing Pressure Roller do not reach the
control temperatures within a predetermined period of time after the warm-up control has
been started.
16.4.4 Abnormally low temperature detection control
• The temperatures of the Heating Roller and Fusing Pressure Roller are monitored using
the Heating Roller Thermistor (TH1) and Fusing Pressure Roller Thermistor (TH2) after
the warm-up cycle. If an abnormally low temperature is detected, “abnormally low tem-
perature 0510/0511” is displayed.
A. Detection start timing
• At the completion of the warm-up cycle
B. Detection termination timing
• A malfunction or media misfeed occurs.
• A door is opened.
C. Detection condition
• The temperatures of the Heating Roller and Fusing Pressure Roller remain below a pre-
determined level for a predetermined period of time or more.
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