Dell 5100cn Color Laser Printer User Manual page 40

4. Holding the imaging drum by the handle with the flat part facing the back of the printer, align the plastic guides on
both sides of the imaging drum with the slots in front of the arrows on the printer. Gently lower the imaging drum
into the printer.
NOTICE: Lowering the cartridge into the printer without correctly aligning the rollers with the slots can damage the
cartridge.
NOTICE: Do not allow the surface covered with a protective sheet to come into contact with anything.
5. Pull the protective cover on the imaging drum straight up to remove it.
NOTICE: Do not touch the transfer roller (black-colored roller). Make sure that nothing touches or scratches the
roller surface. Scratches or oil from your hands on the roller deteriorates print quality.
6. Close the imaging drum cover.