Xerox VersaLink B7025 Service Manual page 1297

Drum Cartridge (Develop)
Toner is supplied from the drum cartridge housing to the photoreceptor drum by the supply
augers and the developer roll. The rotation of the augers mixes the toner and carrier, producing
a negative charge on the toner.
The developer roll has a magnetic core which causes a brush to form at its surface. The height
of the brush is controlled by the trimmer blade. The brush contacts the photoreceptor drum and
the toner is attracted to the latent image formed by exposure to the LPH, that is, to the areas
that have a reduced negative charge.
A developer bias voltage that is applied to the developer roll controls the development process
and gives cleaner background areas. The developer bias voltage is modified based on the
user's selections on the UI. Darker images require a greater amount of negative charge to be
applied than lighter images. Refer to Figure 13
Figure 13 Drum cartridge development principle
Launch Issue
Xerox® VersaLink® B7025/B7030/B7035 Multifunction Printer
and Figure 14.
Photoreceptor Drum
Figure 14 Drum cartridge developer components
April 2017
8-51
BCR Cleaning
Supply
Auger
auger (hidden)
Mixing auger
Developer roll (hidden)
Bias charge roll
Product Technical Overview