Lexmark MS812dn / MS812dtn
Remove paper from the multipurpose feeder.
Remove the jammed paper.
Note: Make sure that all paper fragments are removed.
Flex, fan, and align the paper edges before loading.
Reload paper, and then adjust the paper guide.
If necessary, press on the control panel.
The printer posts a paper jam error with the paper stopping at the rear door. See this article for troubleshooting steps.
Troubleshooting a 202.05 Paper Jam