Brother MFC-8220 User Manual page 182

7
Clean the primary corona wire inside the drum unit by gently
sliding the blue tab from right to left several times. Return the
blue tab to the Home position ( ▼ ) before reinstalling the drum
unit and toner cartridge assembly.
Home Position(▼)
8
Reinstall the drum unit and toner cartridge assembly and close
the front cover.
12 - 29 TROUBLESHOOTING AND ROUTINE MAINTENANCE
Tab
Corona Wire