Photosensitive drum cleaning
A cleaning blade inside the print cartridge clears the remaining toner on the photosensitive
drum as the drum rotates past the blade. This waste toner is moved into the waste toner
container in the top of the print cartridge.
Figure 5-28. Drum cleaning illustrates this step.
Figure 5-28.
Drum cleaning
During the printing process, toner adheres to the primary charging roller and the toner
charging roller. To prevent print quality defects, this toner needs to be cleaned. The DC
controller alternately applies negative bias in different values to the primary charging roller
and the toner charging roller when one of the following occurs:
● The printer is turned on.
● The covers are closed.
● At the start of a print operation.
● After printing a specified number of pages.
164 Chapter 5 Theory of operation ENWW
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