Brother MFC-L5700DN Online User's Manual page 572

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Make sure you put the toner cartridge in correctly or it may separate from the drum unit.

8. Clean the corona wire inside the drum unit by gently sliding the green tab from left to right and right to left

several times.

Be sure to return the tab to the Home position (a). The arrow on the tab must be aligned with the arrow on

the drum unit. If it is not, printed pages may have a vertical stripe.

9. Install the toner cartridge and drum unit assembly back into the machine.

10. Close the front cover of the machine.