Dell 3000cn Color Laser Printer User Manual page 128

When Not Using the Optional Duplex Module
1. Open the rear cover. The inner rear cover opens at the same time.
2. Remove the print media from the back of the printer. The accessible portion of the print media determines how it
should be removed. If the print media is not accessible, go to step 3.
3. Close the rear cover.
4. Grab the feeder cover on the back of the printer and pull down.