Amazing some people just got so impatient with printers. They slam, knock, or even kick the printer when they don't get their printouts. Read the panel dudes...receiving files, paper jam, or they just simply send their jobs to a different printer! Moreover, paper jam can be caused by mismatch paper size. Remember that the tray says A3 and some dudes just try to be smart and put A4 papers in it. How ignorant. READ IT PEOPLE!
Salute to our printers who never complains.