A photocopier works by a light element that runs across an image, reflecting onto a drum that passes over toner particles. Find out how the drum of a photocopier affixes toner to the paper with help from an IT professional in this free video on photocopiers.Expert: Matt Berkowitz Contact: enduserblues.blogspot.com/ Bio: Matt Berkowitz is an IT professional specializing in end-user support for internal networking and hardware-related functions. Filmmaker: Dimitri LaBarge