Xerox VersaLink B7025 Service Manual page 1296

Drum Cartridge (Charge)
NOTE: Some images in this section show the drum cartridge opened to reveal the charge and
development components. This is for information purposes only. You will never need to disas-
semble the drum cartridge.
The bias charge roll (BCR) is in constant contact with and rotates with the photoreceptor drum.
It applies a uniform negative DC voltage charge superimposed with AC voltage on the surface
of the photoreceptor, preparing it to be exposed by the laser print head (LPH).
The surface of the drum is a light-sensitive, dispersion undercoat (DUC) membrane. After the
photoreceptor's surface receives a uniform charge from the bias charge roller, the LPH
exposes (discharges) the image areas. Refer to
Figure 11 Photoreceptor drum charging
Product Technical Overview
Figure 11.
Laser Print Head (LPH)
Exposure of the image on the drum is achieved using a laser print head (LPH).
The ESS PWB controls the LPH directly via the FFC cable. LPH operation begins when the
ESS PWB sends the start instruction and image data to the LPH.
The lasers are switched on and off based on the image density data from the ESS PWB and
the laser light is directed onto the surface of the photoreceptor. The regions of the photorecep-
tor that are exposed by the laser become discharged, forming the electrostatic latent image
that attracts the toner. Refer to Figure
Figure 12 Laser print head (LPH)
April 2017
8-50 Xerox® VersaLink® B7025/B7030/B7035 Multifunction Printer
12.
LPH
LPH
Photoreceptor drum
Launch Issue