Brother HL-5440D - Manual (Page 106)

100
Routine Maintenance
5
g
Put the new toner cartridge firmly into the drum unit until you hear it lock into place. If you put it in
properly, the green lock lever on the drum unit will lift automatically.
Note
Make sure that you put in the toner cartridge properly or it may separate from the drum unit.
h
Clean the corona wire inside the drum unit by gently sliding the green tab from left to right and right to
left several times.
Note
Be sure to return the tab to the home position (a) (1). If you do not, printed pages may have a vertical stripe.
1