How to replace a drum unit on bizhub C450i/C550i/C650i/C750i - YouTube
Compatible Drum Unit Dr618 Color Drum Cartridge Acv80td for Konica Minolta Bizhub C450I C550I C650I - China Drum Unit, Konica Minolta Dr618 | Made-in-China.com
Konica Minolta DR618K (ACV80RD) Black Drum Unit , Bizhub 450i | eBay