Mulfunction of laser beam detector,
turn off the printer wait for a few seconds if still remain - replace laser unit.
Steps to fix brother printer errors E51
Among other basic Brother printer mistakes, this means the laser unit mal-working issues. Laser unit will in general compose data on the drum surface itself which further demonstrates a non-discovery laser bar issue.
Solution:
Turn off the printer and after that turn it on once more. On the off chance that again you are seeing this blunder, at that point, the laser fold is imperfect and indeed, it should be supplanted
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