MFC 7840 - very crisp vertical grey line appears when scanning, but not when copying; glass cleaned
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.
When you scan using the document feeder the scanning is done by the glass strip. There is likely a speck of dirt on the underside of the glass strip that is causing the black line to appear. If you examine the strip carefully you will probably find it. I have the same problem and have not found a procedure for removing the glass.
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did you clean both sets of glasses? there is 1 used when using the ADF, and the big glass when opening up the cover and inserting the paper on the glass
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