Brother MFC-L6750DW Online User's Manual page 582

Make sure you put the toner cartridge in correctly or it may separate from the drum unit.
7. 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.
8. Install the toner cartridge and drum unit assembly back into the machine.
9. Close the front cover of the machine.
After installing the new drum unit, you must reset the drum counter. See Related Information: Reset the
Drum Counter.
NOTE
• Drum wear and tear occurs due to use and rotation of the drum and interaction with paper, toner and
other materials in the paper path. In designing this product, Brother decided to use the number of
rotations of the drum as a reasonable determinant of the drum life. When a drum reaches the factory-
established rotation limit corresponding to the rated page yield, the product's LCD will advise you to
replace the drum. The product will continue to function; however, print quality may not be optimal.
• If an unpacked drum unit is placed in direct sunlight (or room light for long periods of time), the unit may
be damaged.
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