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Service Manual for OL400e/OL410e/OL410e-PS
Chapter 2 Principles of Operation
2.3.05 Fusing Unit
The fusing unit consists of a halogen lamp, a fusing roller, a thermistor and a thermostat.
An AC voltage from the power supply board is applied to the halogen lamp under the control
of the HEAT ON signal from the main controller board. This AC voltage is applied to the 400
watt halogen lamp. The main controller board controls the fusing roller temperature via the
thermistor, and regulates the fusing roller temperature at 150 degrees Celsius by switching
the lamp ON/OFF. If the roller temperature rises abnormally, the thermostat in the fusing unit
will cut the AC voltage supply OFF.
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Summary of Contents for OL400e Series
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