Lexmark MS610dn / MS610dtn
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.
Remove paper that is stuck in the duplex unit to continue printing.
The printer posts a paper jam error with the paper stopping at the rear door. See this article for troubleshooting steps.