Dell 3000cn Color Laser Printer - Manual (Page 130)

2. Remove any accessible print media. The accessible portion of the print media determines how it should be removed. If
only a small portion of the print media is accessible, do not remove the print media. Go to step 3.
3. Close the duplex cover.
4. Grab the optional duplex module and pull back.
5. Remove any accessible print media.
6. Close the optional duplex module.