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optics, open up and just clean every thing you can get at, a streak, will be dust in optics, clean mirrors etc, if very fine lines on every thing, as you say laser printer, would be drum damage. just on scans dust. might need to take top glass plate off.
Try cleaning the glass part with a glass cleaner solution with a damp cloth, but if you need instruction how to clean the inside part of it, suggesting you consult a technician or certified servicer for the product to avoid further issue. thanks for using Fixya!
It sounds like the printhead needs to be replaced. Brother may cover the cost of repair if you call them at 877-276-8437 and tell them the prints are "missing black ink". Very common problem that a new printhead should fix.
Colored vertical streaks - looks like a transfer belt problem, and it's not user fixable. You may need a new belt unit - you can find it for around US$ 80-120, but you may want to have a technician inspect the unit first, since it could arguably be the drum instead, and you don't want to fork around US$ 100 and replace the wrong part. You can try showing a printer sample at a print shop; by looking at the streaks it is possible to diagnose drum, fuser or belt problems. Here you find a much more detailed page, for another printer model, but the issues are mainly the same for most color printers: http://www.laserquipt.com/support/idx/26/452/article/Toner-Smearing-Issues.html
The drum roller is damaged. You must be careful and spin the cylinder. do not touch the roller. You probably have a line in the roller that causes this issue. Each time i have seen this problem, this was the cause.
If this is only happening with copies and not straight prints, it is possible that the problem is with the scanning unit. Use the soft cloth to clean the scanner area to the left side of the machine where pages are scanned when run through the page feeder. A spec of dust or other debris in this area will appear as a streak along the length of the page.
If it occurs on all prints, You may need to replace the drum or clean the fuser unit.