Fusing Unit - Brother MFC-9420CN Service Manual

3.2.4 Fusing Unit

Fusing unit employs the thermal fusing system containing the heater in the roller. Papers carrying
the toner images pass between the heat rollers. Heat and pressure is applied to the paper when
passing between the heat rollers so that the toner image is melted and fused on the paper.
(1) Structure
Fusing unit consists of the following component members; (Refer to Fig.3-26.)
1 Fuser Roller:
2 Back-Up Roller:
3 Fusing Heater:
4 Thermistor:
5 Thermostat:
Heating roller that incorporates the heater in the roller.
Belt unit that presses the paper against the fuser roller.
Halogen lamp.
Sensor that detects temperature of fuser roller's surface.
Device that prevents the fuser roller from being excessively
heated up.
2
Fig. 3-26
3 - 2 3
1
3
5
4
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