Dell 3100cn Color Laser Printer - Manual (Page 202)

4. Before loading the print media, flex the sheets back and forth, and then fan them. Straighten the edges of the stack on a level surface.
5. Place the print media into the tray with the recommended print side face up.
6. Slide the width guides and length guide until they rest lightly against the edge of the print media stack.
7. Insert the tray.
8. If you load any print media into the tray, configure the Paper Type and Paper Size settings for that tray according to the message.
Loading Letterhead
Place the printed side face up.
NOTE: Do not exceed the maximum fill line in the tray. Overfilling the tray may cause paper jams.
Print media source Print side Page orientation
Standard 250-sheet tray module
Optional 250-sheet tray module or 500-sheet tray module
Face up Back of tray
Multipurpose feeder Face up Logo enters the printer first