Lexmark C720 Service Manual - Page 64

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 for drum cleaner unit 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