Tip & How-To about Office Equipment & Supplies

Black lines across copy when using Document Feeder.

Many people ask this same question over and over again. "I get black thin line (s) when using document feeder. If my original is on the platen glass copy is OK."

Well, in most copiers, be it Xerox or Canon or Sharp there is same principle in use. When document is moving it is exposured (copied) by a steady non-moving exposure lamp. If there is any dirt or even a dust particle on the narrow platen glass it will print out as a line.

Most people don't understand this principle and they say "I 've cleaned the platen glass".OK, they have cleaned the BIG glass, but the glass is the narrow one next to the big one. Very often there is glue or white correction lacquer on the platen which of course adheres more dirt.

You may use even the strongest solvents to get dirt off the glass. Remember, it is made of glass and won't get hurt even if you use thinner or nail polish remover.

This tip applies also on fax machines. The receiving end may call back and say "your fax has a lot of lines across the copy".

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i am scanning a photo. I have translucent lines running horizontal through the picture before i print it.


Documents scanned/copied from the document feeder pass over a thin glass area where scanning occurs. Clean this area if sent faxes, copies or scans have black or white vertical lines.
  1. Lift the document cover to expose the platen glass.

  2. Wipe the ADF scan area (C) with a clean, soft, lint-free cloth moistened with water.

    scannerarea.jpg

  3. Then wipe with a clean, soft, dry, lint-free cloth making sure there are no residues left, especially on the platen glass.

  4. Close the document cover and make a copy of a text document to confirm the black line has disappeared.

Dec 20, 2010 | Canon PIXMA MP780 All-In-One InkJet...

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

1 Answer

We have a black line down the center of all copies...


If the problem only happens on copies or sent faxes then no it is not your drum. There is something on your scan glass. My guess is you are getting the line on your copies when you run the original through the document feeder. If you get lines through the document feeder but not on copies made off the glass then it is a dirty scan glass. There is a thin glass strip where the document feeder feeds the original. Usually something like white out that did not dry smears off an original and ends up on this thin strip of glass. Scratch it off with your finger nail and use some glass cleaner to resolve the problem. The scan glass is about 1/2 an inch to an inch wide and will be on the same side of the machine that the copier feeds the originals in on

May 20, 2010 | Office Equipment & Supplies

1 Answer

HP OfficeJet J5780 Vertical Black Line Prints when copying or scaning only. Cleaned rollers and changed black ink cartrigde. Still problem.


Have you tried cleaning the document feeders Scan Glass? (small glass under doc feeder ~ 1" by 9") Most times there is dirt spot on this glass, causing a shadow on scans and copies.
Try copying from the large glass by lifting doc feeder / platen cover and manually placing original. If no line copying or scanning manually from large glass, then small scan glass is deffenitely the culprit. Hope this helps.

Sep 07, 2009 | HP Officejet 5780 Printer

2 Answers

black lines


There is a thin strip of glass that you will see when you lift the top feeder. There is most likely white-out on it.

When you use the top feeder, it doesn't use the large glass, it only 'rolls' the original document over this small strip of glass.

Jan 18, 2008 | HP LaserJet 2840 Printer

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