A scanner unit that includes a scanner for imaging a print medium, a base that supports the scanner, a pressure feed roller disposed opposite the scanning surface of the scanner, a guide member for guiding the print medium to the scanner, a frame member that is supported pivotably to the base, and a motor that is supported on the base. Specifically, one embodiment of the invention implements a general purpose property mechanism in which arbitrary data is attached to any object in the system, thereby providing a convenient way to configure the system without modifying the underlying program code. The at least one quadrant of preconditioned values are stored in a lookup table. A transistor is provided, said transistor being arranged to operate substantially close to a switched on condition. Monochloroethylene carbonate may be subsequently converted to vinylene carbonate.