Fusing - Lexmark C920 Service Manual

5056-XXX

Fusing

Once the paper has been imaged, the paper is detached from the transfer belt by the separation fingers.
After separation, it enters the fuser where heat and pressure are applied to the paper. The toner is melted and
bonded to the fibers of the paper.
Note: The fuser's upper and lower fuser rollers are heated and pressure-fitted. A heater is positioned in
the roller tube, and a thermistor and thermostat remain in contact with the outside of the tube. Fuser
separation fingers are attached near the upper roller to separate the paper from the roller. Each thermistor
sends the surface temperature of the roller to the printer controller. The printer controller turns the heater
on or off according to the voltage of each thermistor. If the controller fails and the temperature of the roller
exceeds specifications, the temperature fuse (TCO) connected to each heater opens, preventing
overheating.
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Service Manual