Ricoh SP 3400N Operating Instructions Manual page 54

Paper and Other Media
G
Load the new paper stack print side down.
Make sure paper is not stacked higher than the upper limit marked inside the
tray.
4
Slide the guides inward, until they are flush against the paper's sides.
Make sure the paper is not stacked higher than the projection on the side paper
guides.
H
Check there are no gaps between the paper and the paper guides; both side
and end paper guides.
48
BXG107
BSP065S
BXG109