OPC drum bụ akụkụ dị mkpa nke ngwa nbipute ma na-ebu toner ma ọ bụ katrij ink nke ngwa nbipute na-eji. N'oge a na-ebi akwụkwọ, a na-eji nwayọọ nwayọọ na-ebufe toner n'ime akwụkwọ ahụ site na drum OPC iji mepụta ederede ma ọ bụ ihe oyiyi. Ogwu OPC na-ekerekwa òkè n'ịkwasa ozi onyonyo. Mgbe kọmputa na-achịkwa ngwa nbipute ka ọ na-ebipụta site na onye na-ebipụta akwụkwọ, kọmputa kwesịrị ịgbanwe ederede na ihe oyiyi a ga-ebipụta ka ọ bụrụ akara eletrọnịkị ụfọdụ, bụ nke a na-ebunye na drum photosensitive site na ngwa nbipute wee ghọọ ederede ma ọ bụ ihe oyiyi a na-ahụ anya.