Dell 5210n Mono Laser Printer - Manual (Page 39)

17. Plug the printer power cord into a properly grounded electrical outlet.
Replacing the Transfer Roller
Order a new transfer roller when light print, toner fog, or background shading appears on printed pages.
1. Turn the printer off, and unplug the printer power cord.
2. Pull on the notch on the front of the printer to lower the multipurpose feeder.
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. Locate the used transfer roller on the bottom of the inside of printer.
6. Pry the left side of the transfer roller up from its slot to loosen it. (Use any kind of small tool.)