Oki C5800 - Manual (Page 109)

Clearing paper jams> 109
12. Lift the front cover release and pull open the front cover.
13. Check inside the cover for sheets in this area and remove
any that you find, then close the cover.
14. Pull out the paper tray and ensure that all paper is
stacked properly, is undamaged, and that the paper
guides are properly positioned against the edges of the
paper stack. When satisfied, replace the tray.