While FU78783 is a highly specific internal part number rather than a consumer device like a camera or printer, it is a critical component—the Stopper Pawl—for various Canon laser printers. This small but essential piece is what ensures the paper tray feeds correctly.
The FU 7-8783-000 is most likely an OEM Internal Service Part, specifically:
If you own a different model (e.g., MG2520, TS9020, or MX492), this part will NOT work. It will either physically not fit or will trigger a dreaded "Unsupported Print Head" error. canon fu78783 work
It is NOT a user-installable accessory. These parts are sold only to Canon Authorized Service Centers or certified technicians.
Solutions:
Since this part is internal, "working" on it usually involves these steps: Sensor Realignment
Signs that this part needs replacement:
Recommendations