Paper jam

Turn the printer off and open the access cover.
Look for any obstructions in the paper path and remove them if necessary. (It is possible to move the carrier assembly with the power off.)
Turn the printer on, load some paper, and press the Form Feed button. (On the X83, press the Select button.)
Watch the paper as it feeds through and try to determine where the jam is occurring.
Check to see if all the rollers are turning.

If all the rollers are turning, there may be something in the feed path that you can't see. Go to step 6.
If not, there is probably a feed motor or a gear problem and the printer may require service.

If the paper is jamming under the carrier assembly, you may be able to fix it using the manual feed slot.
Turn the printer off.
Take a #10 envelope and feed it through the left side of the manual feed slot until it comes right through the printer to the back of the exit rollers.
Move it up and down first, and then slowly move it over to the right side. If something is stuck under the black guide plate, this may work it loose.

If the paper is lodged too far into the printer and can't be removed:
Press the power button to turn the printer off.
Pull firmly on the paper to remove it. If you can't reach the paper because it is too far in, raise the front cover and remove the paper from the front of the printer.
Close the front cover.
Press the power button to turn the printer back on.
Resend your document to print.

Ensure that:
The paper is a recommended paper for inkjet printers.
You do not force the paper down into the printer when you load it. For example, if you are loading letter or A4 size paper, the top edge of the paper should extend above the top of the sheet feeder.
The printer is on a flat, level surface.
The left paper guide is against the side of the paper.
You do not load too much paper in the sheet feeder. Depending on the thickness of your paper, the sheet feeder can hold up to 100 sheets of paper.
The left paper guide does not cause the paper to bend in the sheet feeder.
Your printer feeds regular paper as expected. If regular paper feeds without causing problems, load the envelopes vertically against the right side of the sheet feeder. Make sure the paper guide is against the side of the envelopes.
Envelopes or the appropriate specialty papers are selected in the printer driver.
You are using a paper or envelope size supported by your printer.