Dell 5210n Mono Laser Printer User Manual page 36

3. Push the release latch to the right to open the top front cover.
4. Pull the print cartridge up and out of the printer.
5. Attach the cardboard cover retainer to the hook on the printer.
6. Insert the hook on the bottom of the cardboard cover retainer into the slot on the printer. You will need to lower the top front cover to do this.
7. Locate the used charge roll above the area for the print cartridge.
8. Pull the charge roll to the left until charge roll drops out of the right side.