Canon FU78783 Work appears to refer to an internal part number or firmware/service identifier related to Canon multifunction printers (MFPs) or copier models. In practice this type of label is typically used by Canon service documentation to denote a firmware build, maintenance routine, or a specific replacement part related to device operation and job processing.
Share it with a colleague who’s wrestling with printer parts!
(e.g., "paper gets stuck halfway"), I can give you a step-by-step repair guide!