Oki B 4250 - Manual (Page 36)

PAPER RECOMMENDATIONS > 36
INSTALLING PAPER
1. Remove the paper tray from the bottom of the printer and place
plain paper in the tray, keeping the level of the paper in the tray
below the guide arrowheads shown on the paper guides (1)
NOTE
If you are topping up the paper in a paper tray, it is recommended that you
remove the remaining paper from the tray first then add the new paper stock
followed by the paper you removed. This ensures that the oldest paper is
used first to help prevent paper jams.
NOTE
Load letterhead paper face down and top edge towards the front of the paper
tray.