2 Diagnosing Print-Quality Problems. 3 Paper Jams. 4 Preventing jams. 5 What causes a paper jam?. 5 Paper size jam. 6 Jam at the tray. 7 Jam at the Multi-Purpose Tray. 10 Jam at the exit. 13 Jam at the front. 15 Jam at the rear. 16 Jam at the stacker. 19 Jam at the envelope feeder. 21 Regular Printer Maintenance. 25 Cleaning the outside of the printer. 25 Maintenance Kit. 26 Print Cartridge...