Hello, I’m Nathan, and I’ll be assisting you today. My livelihood depends on your positive feedback, so your satisfaction is my highest priority.
Sorry to hear you’re having trouble.
There are a few possible causes of this, but it is most likely a bad drum.
That is a simple and relatively inexpensive fix, you just install a new drum unit.
You may order one here: http://www.cartridgesave.co.uk/toner-cartridges/Brother/DCP-7055.html
If that still doesn't help, then replacing the fuser (fixing unit) would be next. This is relatively inexpensive as well, assuming you go with a generic part. If you buy OEM brother parts for both, it wouldn't be worth fixing, you could replace the entire printer for less than the cost of parts, starting with a whole new system and a fresh warranty.
If both of these fail, which is unlikely, then the fault is in the laser/optics, which wouldn't be repairable at a practical cost, that would require replacing the entire system as well, but again this is very unlikely. I would start with the drum replacement.
Thanks. We will try that
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Thank you, and have a good day,