Why is my printer incorrectly stating that there's no paper?

Episode 1285 (27:53)

James from Los Angeles, CA

James got a hand me down printer, but now it's saying that there's no paper in the tray even though there is. It used to work fine, but now it just won't. Leo says he really doesn't know what it could be, other than a sensor or a lever in the printer that isn't working properly anymore.