Conditioning the drum, Primary charging roller

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.

Primary charging

roller