ENWW Image formation system 157
Cartridge cleaning control
This control is for the primary charging roller cleaning.
As the printer prints pages, toner gets attracted to the primary charging rollers. Accumulated toner
on the roller can cause some image defects, therefore it needs to be cleared away.
The DC controller sends a command for this control every specified number of pages.
The DC controller disengages the developing cylinder to start this control and apply two negative
biases alternately to the primary charging roller. This attracts the toner away from the primary
charging roller to the photosensitive drum. The toner on the photosensitive drum is then scraped
off the drum by the cleaning blade to be delivered to the waste toner container.
Figure 5-42 Transfer section diagram
Transfer section
The transfer section, see the figure on the following page, consists of the transfer unit and the
secondary transfer unit. The transfer unit transfers the toner on the photosensitive drum to the ITB.
The secondary transfer unit then transfers the toner on the ITB to the paper.
ITB (transfer) unit
The ITB unit consists of components such as ITB, primary transfer roller, ITB feed roller, and waste
toner full sensor.
As the drum motor (M3) rotates the ITB feed roller, the ITB feed roller rotates the ITB, and the ITB
rotates the primary transfer roller.
The primary transfer roller engaging cam is to engage or disengage the Y, M, and C cartridge’s
primary transfer rollers from the ITB. It is rotated by the primary transfer roller engaging motor
(M5).
The waste toner full sensor detects whether the toner piled up in the waste toner container if full
after the ITB cleaning.
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