The ETB is automatically cleaned when the printer is turned on, when the covers are closed,
and after printing a specified number of pages. The DC controller applies negative bias to
the photosensitive drums and either a positive or negative bias to the transfer charging
rollers. This creates a difference in potential between the photosensitive drums and the ETB.
Both positive and negative residual toner returns to the photosensitive drums.
Figure 5-27.
ETB cleaning
ENWW Image formation system 163
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