Dell 5100cn Color Laser Printer User Manual page 39

Installing the Imaging Drum
CAUTION: Make sure nothing touches or scratches the surface of the light-sensitive drum surface
(green-colored roller) or the transfer roller (black-colored roller). Scratches, dirt, or oil from your
hands on the imaging drum or transfer roller may reduce the print quality.
1. Push the front latch up and fully open the front cover.
2. Push the button as shown in the following illustration and open the imaging drum cover.
3. Remove the protective cover from the imaging drum.