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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.
The contact image scanner is faulty or the cable from the motherboard to the contact image scanner is faulty. I would bet it is the CIS as this scanner is used in many different machines (canon,lexmark,sagem) and it gives problems in all the machines. You can usually salvage a good one from an elcheapo lexmark inkjet multifunction.
What printer do you have? Is the black line appearing on the paper when you print or when you fax/copy something?
If it is the latter, then there will be a mark on the optics glass that needs to be cleaned. Usually people using whiteout when wet causes this.
You will need to lift the cover where the paper goes through and check the glass
PLACE A PLAIN PIECE OF WHITE PAPER IN MACHINE AND TAKE A COPY. IF NO LINES ARE ON IT THEN THE LINES ARE COMING FROM THE MACHINE THAT IS SENDING TO YOU BUT IF U DO HAVE THE LINES THEN PRINT HEAD IS PROBABLY FAULTY OR DIRTY.
If it is just on faxes you are receiving and not on ones you send it sounds like it may be your drum. You may have a small tool in the fax to gently rub across it and clean it. check your manual to make sure. In worst case scenario you will have to get a new drum. Look on line for your model. Other wise if it's on copies and faxes you send as well it's going to be the thin piece of glass right where the pages are being feed in that needs to be cleaned
Open the front of the fax machine. Then pull down the the tray that has the down arrow imprinted on it. Locate the glass strip towards the back, just behind the center roller. Use a cloth and rubbing alcohol to clean the glass and that should remove the black line.