Drum Cleaner Process - Lexmark C720 Service Manual

5024-001

Drum Cleaner Process

In the drum cleaner process, the residual toner on the surface of the
transfer drum is removed after the paper transfer process. See
"Printer Theory of Operation" on page 1-14
location.
The drum cleaner brush is a semiconductor type fur brush (positively
self-biased by positive voltage FCBV(V)) which cleans the surface of
the rotating transfer drum.
Notes:
– The cleaning brush is not in contact with the drum while
imaging.
– The cleaning brush does contact the drum to remove
remaining image from the drum.
The rotating drum cleaning roller is biased to the positive FCBV(V),
causing the negatively charged residual toner to be electrically
absorbed into the drum cleaner brush. The residual toner is
attracted by the positive FCBV(V) and adheres to the surface of the
drum cleaner roller.
Waste toner, adhering to the surface of the drum cleaner roller, is
removed by the cleaning blade and collected into the waste toner
container located by the waste toner feeder.
1-34
Service Manual
for drum cleaner unit