Dell 3100cn Color Laser Printer - Manual (Page 201)

Loading Print Media
Proper print media loading helps prevent jams and ensures trouble-free printing.
Before loading print media, identify the recommended print side of the print media. This information is usually on the print media package.
Loading Print Media in Standard and Optional Trays
Multipurpose Feeder
Loading the Multipurpose Feeder
Using the Multipurpose Feeder
Linking Trays
Using the Duplex Function
Using the Center Output Tray
Using the Support Extension
Loading Print Media in Standard and Optional Trays
All trays are loaded the same way.
1. Remove the tray.
2. Slide the width guides to the edge of the tray. The width guides should be fully extended.
3. Squeeze the length guide and slide it to the edge of the tray.
NOTE: To avoid paper jams, do not remove trays while a job prints.