Lexmark 500n manual Fusing unit

5023-110

Fusing unit

The fusing unit utilizes a thermal fusing system that contains a heated fusing roller and a belt-like backup roller. The heated roller contains an inner heating element. The backup roller contains three pressure members located behind the belt. Paper carrying a toner image passes between the rollers where heat and pressure are applied to the paper to fuse the toner to the paper.

The fusing unit consists of the following components:

No.	Part	Function
1	Fusing roller	Used for fusing, containing a heater.
2	Back-up roller	Pressure roller.
3	Fusing heater	Heating device heated by a halogen lamp.
4	Thermistor	Sensor that detects the temperature of the fuser roller’s surface.
5	Thermal fuse	Protective device that prevents the fuser roller from being excessively
		heated.

General information 1-33