Complete the following steps to verify the drum and toner are inserted correctly, and the top cover is closed securely on both sides:
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Raise the top cover by lifting the tab on the front center of the unit.
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Remove the drum unit by lifting its handles slightly, then pulling it out. Check for and remove any foreign objects that may have accidentally fallen inside.
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Next, reinstall the drum unit into the machine.
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Lower the top cover, making sure it is evenly closed on both sides.
If "Cover Open" continues to appear, please contact the Brother Service Center near you.