Black vertical line along left margin when using the adf to scan.

The Black Line running vertically on the page can be a couple of things.

1) If you are using the ADF (Auto Document Feeder) then the most likely cause is a mark on the ADF Scanner Glass normally caused by something going through the ADF with wet ink on it usually a page that has been written on with a Ball Point pen and the ink had not dried fully before it was fed through. If you lift the top of the printer so you can see the full glass scanner plate on the left had side you will see a smaller strip of glass/plastic that is used for ADF scanning. Clean this using Window Cleaner or Rubbing Alcohol.

2) if you are not using the ADF, or if you are and the previous option did not fix the problem then it could be a scanner bulb issue which would require a service technician replacing the scanner bulb. If the printer is under warrantee then this should not cost anything. If it is not in warantee then replacing the printer would be cheaper.

the ocr sensor in the ADF needs to be replaced, I would recommend replacing the whole ADF as a whole.

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Happened with me too. Turned out to be a small sticky smudge on the ADF glass. That is the smaller glass scan area to the left of the large glass scanning area.
When using the ADF to scan or copy, make sure the smaller glass area is clean along with the rollers.

Hi,
Your machine ADF is dirty or dust in adf glass please clean it by soft cloth and scane again its clear and sharp.
thanks.

When you say one sided scans are OK, are you using the ADF (auto document feeder) or the flatbed? Are you using the ADF for the two sided scan? What parts have you cleaned thus far? A little more info please?

thanks

happened to me after i fed a page with not-too-hard whiteout on it. the feeder makes the page run through a different piece of glass and i just had to clean it.

If you lift up the lid on your scanning device you will notice a glass strip about 1 inch thick and then the large area of glass used for flatbed scanning. The 1 inch strip is used for ADF scanning. Because your papper is moving across the glass strip, any dot, smudge or scratch will affect your scanning and cause verticial lines down the page. Sometimes the dot is not visible to the eye. Get some glass cleaner that has alcohol in it and thoroughly clean the glass strip and it should solve your problem. If it turns out to be a scratch on the glass then cleaning won't help.

there is a dirt on the ADF (CIS contact image sensor) that reads your document, identify where the lines came from either from top or bottom then open your adf and clean the affected area. this will solve the problem.

the scanner system using ADF is not the same as in using from the platen glass, (CIS usually called contact image sensor) reads your document and sends the info to be printed, chances are your CIS assembly could be dirty and have some dirt on its surface, try opening this area on the top of ADF and clean with a moistened cloth, especially the affeced left margin, it should work!