Dell 3000cn Color Laser Printer User Manual page 169

2. To insert the drum cartridge, push up the lever on the right side of the printer. With the lever in the upright position,
hold the drum cartridge by the handle, align the arrows on the drum cartridge with the corresponding arrows on the
printer and guide the cartridge in until it snaps into place.
3. Pull down the lever on the right to lock the drum cartridge in place.
4. Close the top cover.