Brother MFC-8420 User Manual page 405

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.
22 - 31 TROUBLESHOOTING AND ROUTINE MAINTENANCE
Tab
Corona Wire