The lid needs to be opened slowly, and the printer should be removed from its drum. Also, separate the toner cartridge assembly. Be sure to save the paper that the cartridges are kept to prevent spilling the ink. For further assistance, check out my blog- Brother printer offline windows 10

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The corona wires have become dirty. Clean the corona wires in the drum unit. ...
The drum unit or the toner cartridge and drum unit assembly is not installed correctly. Reinstall the toner cartridge and drum unit assembly. ...
If the issue still continues, the drum unit is at the end of its life.
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