Brother HL- SERIES User Manual page 112

Routine Maintenance
c
Clean the primary corona wire inside the drum unit by gently sliding the green tab from right to left and
left to right 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.
d
Put the drum unit and toner cartridge assembly back into the machine. Close the front cover.
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