Dell 3100cn Color Laser Printer - Manual (Page 152)

1. To open both covers on the printer, grab the notch in the front door and pull forward. Lift the top cover and push back.
2. To remove the used drum cartridge, push up the lever on the right side of the printer.
3. Grab the drum cartridge by the handle, and pull it up and out.
Installing the New Drum Cartridge
1. Remove the protective sheet from the drum cartridge.
CAUTION: Do not touch inside the printer with your hands. Some parts may be hot. Allow time for the printer to cool before attempting to remove
parts in this area.
CAUTION: Do not touch the drum at the bottom of the drum cartridge.