Black line down middle of page

Hello you can try and fix your problem using the steps suggested below. You may need to clean the corona wire

1. Lookat the corona wire on each toner cartridge. If a corona wire is dirty that maybe the reason that you receive black lines on the pages.Do you have trouble when you receive a fax? If that is the problem look what is cousing it below:
1 Ifyou receive black lines while receiving a fax, the cause of that problem may bedirt in the fax which is sending you the information to you. Advice your senderto clean its fax or to replace the toner cartridge with new.
I hope this can be of any help to you.

The problem lies with the black toner cartridge. This is a common problem in these machines due to poor design by Brother. Best solution is to replace the offending color toner cartridge.

Yes some of dust have your printer drum unite.Open drum and clean it then solve your problem.

Hello sir;The streak line from printing also should be from copy, because the line come from imaging unit, check the meter count if close to or over 50,000 then replace drum and drum blade, it will take care the problem.
The brother printer you need to replace imaging unit( drum unit).

try moving the small blue slider on top of the drum cartridge side to side 10 times.

probably a bad drum cleaning blade, It's part of the drum unit

The small glass surface at the top of the scanner bed had some gunk on it. I scrapped it off and the line went away! Yay!

1,check the scannor unit,which is doccument feed in open the cover look the piece glass is clean.
2, replace drum cartridge.

open the top cover on the left hand side glass plateform with a narrow piece glass clean it with alcohol.

clean theSCANNER LENS WITH GLASS CLEANER ON A MICROFIBER TOWEL(SCANNER lens is under large feed roller on auto document feeder