Dell 5100cn Color Laser Printer User Manual page 187

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.
3. Unpack a new transfer roller and grip the tabs as shown.
4. Align the arrow marks on the transfer roller to the marks on the printer, and gently push the roller into the printer.