Lexmark W850n Service Manual page 175

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Cleaning
The Cleaning Blade removes any toner that remains on the drum after the transfer process. The toner that the
Cleaning Blade removes is collected inside the sealed PC Cartridge and reused.
Discharge
At both the start and the end of each individual printer cycle, the HVPS supplies the charge roll with an AC
voltage that is used to electrically clean the drum. The AC voltage removes any residual DC charge that was left
from the previous print cycle.
At the beginning of each individual printer cycle, the Printhead scans the surface of the drum, further discharging
any residual DC charge that may be left on the drum.
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Diagnostic aids