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CHAPTER II -23
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 when starting or non-printing time. The toner will be collected by the
developing roller and reused (for further developing).
2.5.6 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 uniform change in the primary charging stage.
2.5.7 Fixing Stage
An image transferred on 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. The cleaner
ASSY HR eliminates toner stains on the surface of the heat roller.
Fig. 2.29
Pressure roller
Cleaner ASSY HR
Thermistor ASSY
Halo
g
en heater lamp
Heat roller
Cleaner ASSY