Drum Cleaning And Erasing Static Charge - Mita DP-2800 Service Manual

5A2

Drum cleaning and erasing static charge

The drum needs to be physically cleaned of toner which is remaining on its surface in the
development process. The cleaning blade (A below) is constantly pressed against the
drum and scrapes the residual toner on the drum off to the refresher roller (B below). The
refresher roller drives the toner to the spiral (fins) roller (C below). The waste toner is
collected at the output end of the spiral roller and sent back to the toner container, into the
waste toner reservoir.
D
A
C B
After the drum is physically cleaned, it then must be cleaned to an electrically neutral state.
This is necessary to erase any residual positive charges, ready to accept the next uniform
charge. The residual charge is canceled by exposing the drum to the light emitted from the
eraser LED (D above). This lowers the electrical conductivity of the drum surface making
the residual charge on the drum surface escape to the ground.
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