Dell 5100cn Color Laser Printer User Manual page 83

3. Squeeze the length guide and slide it to the edge of the tray.
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.
NOTE: Do not exceed the maximum fill line in the tray. Overfilling the tray may cause paper jams.
6. Slide the width guides and length guide until they rest lightly against the edge of the print media stack.