Dell 5100cn Color Laser Printer - Manual (Page 85)

The multipurpose feeder accepts print media within the following dimensions:
Width -- 88.9 mm to 220 mm
Length -- 139.7 mm to 355.6 mm
Loading the Multipurpose Feeder
In addition to plain paper, the multipurpose feeder can use various other sizes and types of print media such as
envelopes, and transparencies.
1. Gently pull open the multipurpose feeder cover, and pull out the extension tray.
2. Slide the width guides to the edge of the tray. The width guides should be fully extended.
3. Insert all media face down and top edge first into the multipurpose feeder.
NOTE: Do not force the print media.
4. Slide the width guides until they rest lightly against the edge of the print media stack.
NOTE: Be careful not to bend the print media.