I was told by one of you that the reason was bad drivers and to remove the software and reinstall it again. Bad advise. The blue line is a sign of dust. We cleaned the unit and the blue line dissapeared. I wasted $15.99 for bad service.
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If it's a vertical line from top to bottom (portrait), then one of the sensors in your scanner bar is burned out. Unfortunately, there's no fix for this, as that is a hardware problem and not a user serviceable part. If it's under warranty, exchange it for another one at the place where you bought it.
I have the exact same problem. It was there since I first bought the MFC-7840W.
Vertical line appears in scans using the automatic document feeder (ADF). Vertical line does not appear when scanning single page (placing it directly on the glass -- i.e. not using the ADF). Cleaning the glass strip for the ADF (or the white pressure bar overhead) does not solve the problem. The problem does not occur with copies using the ADF (using the COPY button which is basically a scan and print). This would suggest that dust and dirt is not to blame because that would also appear on the copies. But since I believe a copy is basically a scan plus print, they should be using the same electronics -- a hardware problem on the scan would likely appear on a copy also -- there is some difference between how they accomplish this.
It's definitely not a software issue since it occurs on all versions of Windows and Mac OS X (and multiple computers). It also does not matter whether I "push" the scan to the computer by using the scan button on the MFC... or "pull" the scan from the MFC using the Brother Control Center software.
This is because of dust sticking to the glass. Clean with isopropyl alcohol (rubbing alcohol) and dont use solvents. For emergency you can use your after shave but take care only to clean the glass portion!
S. Mohan, Chennai, India