Oki C8800 - Manual (Page 170)

Clearing paper jams > 170
14. Check inside the cover for sheets in this area and remove
any that you find, then close the cover.
15. 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.