Brother International MFC-P2000 Service Manual - Page 40

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). 6) Erasing 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. 7) Fixing 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. Pressure roller Thermistor ASSY Halogen heater lamp Heat roller , , , , CleanerASSY ,, , , Fig.2-30 II-21