Typically after a paper jam the encoder strip gets dirty. Cleaning it usually resolves this issue. Heres how to check it. If you open up the front where the paper prints, theres a clear strip that goes from left to right (its right above the greasy metal strip). If the strip is dirty (typically with ink smudges), clean with a little bit of water and q-tips. BE GENTLE! And, be sure to UNPLUG the machine before proceeding. After cleaning do a test print to confirm.
