2GM
2-1-18
(7) Cleaning
After the transferring process, the drum needs to be physically cleaned of toner which is residual after the development
process. The cleaning blade is constantly pressed against the drum and scrapes the residual toner off to the sweep
roller. The waste toner is collected at the output end of the sweep roller and sent back to the toner container, into the
waste toner reservoir.
Figure 2-1-18 Drum cleaning and erasing static charge
After the drum is physically cleaned, it then must be cleaned to the electrically neutral state. This is necessary to erase
any residual positive charge, ready to accept the uniform charge for the next print process. The residual charge is
canceled by exposing the drum to the light emitted from the eraser lamp. This lowers the electrical conductivity of the
drum surface making the residual charge on the drum surface escape to the ground.
Cleaning blade
Drum
Eraser lamp
Sweep roller
Waste toner reservoir
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