Dell 2330d/dn Mono Laser Printer - Manual (Page 85)

c. Move the rear paper guide to the back of the paper tray.
3. Flex a stack of paper back and forth. Straighten the edges on a level surface.
4. Load the paper in the tray with the print side facing down.
Ensure that the paper is below the maximum fill line on the side paper guides. Overloading may cause paper jams.