Two black vertical lines appear on copy, pdf, and scan results

Check the drum history? If the yield is not yet reached, you should clean the charge roller, cleaning blade brush and cleaning blade. Remember to vacuum beneath the cleaning blade! See if that works, otherwise you should call a techie to replace the drum. If yield is not reached they will charge you for a new drum.

I suspect the Document Feeder is not aligned properly and light is leaking in. You will need to have a technician in to check the alignment of the scanner to see if it needs to be readjusted. random black lines on edges usually indicate light leaking into the scan area.

Hello James,

Please click Vertical Bands Lines or Streaks in Copies Faxes or Scans to access the troubleshooting steps that should resolve the issue.

Print quality is good, b&w copy is good. When i make a color copy the machine makes blue lines or bink lines. This is a brand new c452.Scan to PC is ok, print its ok only copy. Lines are vertical.

Check your flat bed and Document feeder scanning glass need to be clean, if any dot or dust in scanning glass of document feeder it will appear a line, check this points first
1- Check printouts from computer or FAX if it is clean problem in scanning section
2- Check using Copying a blank paper using only Flatbed if it prints without any line its problem from document feeder Scanning glass
So solution is clean the Document feeder scanning glass using wet cloth, note careful about wet cloth switch off the machine and clean it

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

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/edwy_1a56970cf1ea4620

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.

For this kind of problem you need to call the tech support because the printer is already messed up and it is in need of replacement

Hope this help

Byron

Lift the lid and to the left of the main glass is a smaller glass; that is what scans during the feeding process. Make sure that it is completely clean; even a speck of dust can cause a line to appear. I took a lens wipe and cleaned mine and my line was gone.

Open up the document feeder. You will probably find wite-out on the scanner glass.