Question about Brother MFC 7420 All-In-One Laser Printer

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Solid black line down the document when scanning

Have a Brother MFC-7420. When I scan, there is a solid black line down the document about 2 inches from the right margin. I've cleaned everything and can't get rid of it.

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  • Anonymous Mar 23, 2014

    when scanning documents, have three black lines that appear on scan. have cleaned as directed and also put in new drum and cleaned again

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  • 133 Answers

Are you using the autofeeder to feed your documents?
if yes, open the top cover and clean both glasses (big and small).
and take the drum out, move the blue panel to clean up your drum.
after that should be working fine.

Posted on May 22, 2009

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1 Answer

My Brother MFC-7420 Printer always prints black lines and splotches down the left side of my paper. This happens whether I'm scanning or printing from my PC. When I looked at my drum, it appears a


If you are seeing vertical streaks/black lines your primary corona wire is dirty and or the fax scanner may be dirty.
1)To clean the corona wire you take the drum unit and toner cartridge and place it on disposable paper to avoid spilling.
2) Clean the primary corona wire inside the drum unit by sliding the blue tab from right to left several times.
3) Return the blue tab and snap it into the home position.
4) Reinstall the drum unit and toner cartridge.
5) Close the front cover.
Caution: if you do not return the blue tab to the home position it may repeat the black lines.

Nov 29, 2012 | Brother MFC 7420 All-In-One Laser Printer

1 Answer

Copies are being printed with a line vertically down the side of the page. Only happens when copying using the hopper.


If it's a thin, sharp line, it's just a blob of ball-point pen ink on the scanner glass. Lift the lid, and you'll see the narrow strip of glass that the scanner uses when you feed a document through the feeder. Clean that with a rag dampened with window cleaner, or, better yet, alcohol. Even a dot of ink too small to see will show as a solid black line on anything you copy, scan, or fax via the doc. feeder.
Don't use so much cleaner that it runs under the glass.

Nov 10, 2010 | Brother MFC 7420 All-In-One Laser Printer

1 Answer

Verticle lines appear on document when scanning through document feeder. No verticle lines on document when it is scanned face down on the glass. How do I clean the document feeder?


There is a thin strip of glass next to the main platen glass, where documents fed through the feeder are scanned. You most likely have Wite-Out or some sort of debris stuck to the glass. You can probably wipe this residue off, but if you need to clean that strip of glass, use alcohol and a lint-free rag.

Oct 07, 2010 | Brother MFC-7420 Laser Printer

2 Answers

Brother MFC-7820N Printer--vertical lines


You need to clean the scanner glass. Also known as the strip glass. It is a 1 inch wide strip of glass that runs from the front to the back. Your documents pass over this glass when they are scanned. Some of the wax crayon probably smeared off onto the glass and now when you scan the scanner sees these marks as stationary and thus records them as solid lines. Just look into the scanner section where your documents are fed in or depending on model, some are just to the left of the large original glass.
Good Luck and thank you for using Fixya.

Feb 25, 2010 | Brother MFC-7820N Printer

1 Answer

My MFC-7420 Printer wont scan


We are having problems on scanning documents with our MFC-7420 Printer to send to email?

Jun 23, 2009 | Brother MFC 7420 All-In-One Laser Printer

1 Answer

Mfc-7420 Black Line horizontal across paper in 3 places


try moving the small blue slider on top of the drum cartridge side to side 10 times.

Mar 10, 2009 | Brother MFC 7420 All-In-One Laser Printer

2 Answers

Line on scanned documents


If I could be of further assistance, let me know. If this helps or solves the issue, please rate it.
Thanks, Joe

Feb 20, 2009 | Brother MFC 7420 All-In-One Laser Printer

1 Answer

I have a brother mfc-7420 flatbed and am trying to scan multiple pages through the automatic feeder but it only scans whats on the flatbed? Is the feeder only for copies and not for scans? Anything i can...


First install everything, than go to my computer at the bottom u will have Scanners and Camera, click on Brother MFC-7420 USB
Than if the window pop ups than click on Microsoft Scanner and Camera Wizard
Now u will have new Window "Scanner and Camera Wizard" click Next
On next page u will see Choose Scanning Preferences in there u will find "Paper Source"
click on the Scroll down option and pick "DOCUMENT FEEDER" and Click next
than hopefully u know wat to do pick the name fro scans that u going to make pick the folder to place it in and it will start scanning by it self and will send i to ur computer.
And put ur Scan paper with the side that u wanna scan FACE UP in the FAX tray which is on the Top or all in one Printer

Dec 02, 2008 | Brother MFC 7420 All-In-One Laser Printer

1 Answer

BROTHER MFC 7420 PRINTER SOLID VERTICAL LINE...


Open te lid and look at the glass. You have dirt or white-out or something on the thin strip of glass to the left. Clean that glass!

Good luck!

Oct 07, 2008 | Brother MFC 7420 All-In-One Laser Printer

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