I have a Brother MFC 8440..the paper is coming out blackened with tiny black vertical lines so the entire paper looks dark. i have cleaned the demagnitizer bar on the drum which didn't help.
Try changing the toner, if it's generic that's your problem, and if it's either an old brother drum or a generic you may need a new one. There is also a glass to clean, it's right above where the drum sits inside, 1/2 inch wide across the top. Wipe with a dry cloth.
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