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If you are getting lines on the faxes you send it means that the glass of the scanner is dirty. Best method to clean the glass is rubbing alcohol and a soft cloth. The alcohol will remove adhesives and white out better than glass cleaner. You may need to look closely because a small amount of adhesive will distort the scans and cause lines and may not be obvious unless inspected very carefully.
It really depends on how thick the black line is. If its say 1/2" to 1" thick then a segment of the contact image sensor has failed. If its very thin then that would be just dirt either of the scanner glasses or under them. When you open the scanner cover you will find two glasses. the thinner one is for the adf and the very large is for flat bed scanning. If you get the line when using both then the CIS is faulty and needs replacing. If either one is good with no line then it could be just the ribbon cable that goes from the main board to the CIS.
You could clean the black ink cartridge. For this you need to remove the black ink cartridge which is present in the printer. In order to clean the laser or scanner block you could use a cotton swab as it would fully clean the dirt. You need to clean the grime and the dried ink present in the printer. This would remove all the hindrances which prevent the ink from flowing. Cleaning the printer heads would also help to solve the problem.
the blcak line that runs from top to bottom is due to a dirty misaligned print head...do a full printer maintenance on your printer/scanner . Once the heads and rollers get clean and the printer is aligned, it should get rid of any black streaks or lines. I own a Brother Printer/scanner and it did the same thing to me, as soon as I ran maintenance on it..it fixed the black straks and lines I had on my prints.
Do you use the document feeder when faxing and scanning? If so, the line is likely some paper dust, white-out, or other dirt on the thin piece of glass to the left of the main platen glass. Wipe that glass strip with a lint-free cloth, and if that doesn't work try using a little bit of alcohol.
If the line persists, or it occurs when you don't use the document feeder, it's probably dust somewhere in the optical portion of the unit, underneath the glass. If you want to take it apart, you can blow some compressed air around down there to scatter the dust or try wiping down the mirrors with a lint-free cloth.
The cause of this problem is usually a dirty scanning glass (there might be ink or white out on the glass). Check the glass really closely or the cause could be dirty optics or a bad CCD board. There are mirrors underneath the scanning glass. Dirty optics can cause lines when faxing or copying. If you can not access these mirrors, they would have to cleaned by a technician.
If the black lines comes when using the ADF (top feeder), try to see if you get the same problem when using the scanner glass or receiving faxes. If you don't, you simply have to clean the glass strip to the left of the a4 sized scanner glass. Wipe it with a dry cloth piece, no paper and no water/alcohol. If you see some dirt there that you're unable to simply wipe off, try to use a cotton wool to "rub" it off.