- Hewlett-Packard Printer User Manual

Conditioning Stage
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’s surface. The
amount of DC voltage is modified by the print density setting
from the Control Panel.
Figure 5-9 Primary Charging Roller
Functional Overview 5-19