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Q1860-90918 Chapter 5 Functional information 85
Conditioning the drum
After the drum is 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. 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 to create a uniform negative potential on the
drum surface. The amount of dc voltage is modified by the print density setting.
Figure 18. Primary charging roller
Photosensitive
Drum
Primary charging
roller
AC bias
DC bias
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