Brother HL-1020, HL-820, HL-1040 manual Drum Cleaning Stage, Erasing Stage, Fixing Stage

2.5.5 Drum Cleaning Stage

In the image transfer stage, not all the toner on the photosensitive drum is transferred onto the paper but some remains on the drum. In the drum cleaning stage, the drum surface is cleaned by the cleaning roller, so that residual toner on the drum surface is removed and collected on the cleaning roller itself. The residual toner on the cleaning roller will be discharged to the drum during starting or non-printing time. The toner will be collected by the developing roller and reused (for further developing).

2.5.6Erasing Stage

Before the cleaning stage, the drum surface is exposed to the light emitted from the erase lamp (LED lamp). This stage prepares the drum by decreasing its surface voltage uniformly, ready to receive a uniform charge in the primary charging stage.

2.5.7Fixing Stage

The image transferred to the paper by static electricity is fixed by heat and pressure when passing through the heat roller and the pressure roller in the fixing unit. The thermistor ASSY keeps the surface temperature of the heat roller constant by detecting the surface temperature of the heat roller and turning on or off the halogen heater lamp.

Thermistor ASSY

Halogen heater lamp

Pressure roller

Heat roller

Cleaner ASSY

Fig. 2-41

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