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

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

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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.

Posted on Nov 10, 2010

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To solve the printing problem..


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# Then dab the cartridge on the towel to make sure the ink is flowing.
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1. Look for a shiny piece of metal underneath the contacts at the back of the carrier.
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# Reinstall the cartridges, making sure you snap them correctly into the printer. 


Hope this help. Please Rate My Response! Thanks! 
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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!

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If the problem only occurs when using the document feeder, the problem is not usually caused by the drum. When using the document feeder, try to notice where the scanner (the light assembly under your scan glass)stops just before the paper is being fed. Some multifunction machines have a small piece of glass that is separate from the large scan glass and the scanner assembly stays parked underneith it as the original is being fed over it. Most likely there is something on the glass where the scanner parks as originals are being fed thru the feeder. When putting your original on the large scan glass to copy, the mark on the glass will only show as a spot, but will show as a vertical line thru the whole copy when using the feeder.

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