BACKGROUND

A photoconductor used in an image forming apparatus such as a printer, a copier, a scanner, a multifunction device, or the like is an example of a consumable that may be replaced when its usage amount has expired. A user may check a state or a replacement time of a consumable through a user interface device of the image forming apparatus and may replace a consumable that has reached a replacement time directly or with the help of a service technician.

