B710, B720, B730 User’s Guide > 12
Internal View
1 Drum/toner
cartridge
Contains the toner and the photosensitive drum.
2Transfer roll
cartridge
Transfers the toner image on the surface of the
photosensitive drum to the paper.
3 Fuser unit Fixes the toner on the paper. Do not touch this
when using the printer as it is hot.