HP LaserJet 4v/mv Service Manual - Page 82

Drum Conditioning

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Figure 5-8 5PRIROL Drum Conditioning After the drum is physically cleaned, it must be conditioned. This process consists of applying a uniform negative charge on the surface of the drum with the primary charging roller, located in the toner cartridge. The primary charging roller is coated with conductive rubber with an AC bias applied to erase any residual charges and maintain a constant drum surface potential. In addition, a negative DC bias is applied by the charging roller to create a uniform negative potential on the drum surface. The amount of DC voltage is modified by the print density setting. Primary charging roller AC bias DC bias Photosensitive Drum Primary Charging Roller 5-20 Functional Overview

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Drum Conditioning
After the drum is physically cleaned, it must be conditioned.
This process
consists of applying a uniform negative charge on the surface of the drum
with the primary charging roller, located in the toner cartridge.
The
primary charging roller is coated with conductive rubber with an AC bias
applied to erase any residual charges and maintain a constant drum surface
potential.
In addition, a negative DC bias is applied by the charging roller
to create a uniform negative potential on the drum surface.
The amount of
DC voltage is modified by the print density setting.
Primary Charging Roller
Photosensitive
Drum
Primary charging
roller
AC bias
DC bias
5PRIROL
Figure 5-8
5-20 Functional Overview