You will also need to try disassembling and cleaning the drum:
1. Remove drum and toner assembly2. Remove toner from drum3. Remove small metal c-clip from one side of the drum roller shaft (be careful not to lose clip)4. Pull shaft out from other end5. Lift roller assembly straight up - might require slight prying6. Carefully remove roller from roller assembly without touching the roller.7. Wipe (soft cloth), vacuum, etc excessive toner out of the brush 8. Carefully wipe down the metal wires to remove excessive toner9. Carefully reassemble the drum/toner assembly10. Clean the corona wire with the green tab.11. Insert drum unit12. Test printer to confirm it is now working again.