An image forming apparatus, and a method for performing an auto color registration. The miniature optical drum scanner configuration obtains a wide scanning field-of-view and large effective aperture is achieved within a physically small size. The curved extension portion includes two posts and is positioned at the cover. This arrangement makes it possible to eliminate the use of a conventional rotary motor and a crank mechanism to drive the driving piston. For other devices, a user interface is provided through a graphical tool to allow configuration to specify the desired device andor network for monitoring.