Question about HP LaserJet 3050 All-In-One Printer

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I have a thin line all the way down the page when making a copy.

Only when making a copy, I have a thin line down the entire page of the copy. If I print something from the computer, the line is not there. What could be the problem, and how do I fix this?

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  • 162 Answers

Check scanner glass and clean. Further test - Scan from the computer. If the line is still present, the scanner CCD is failing and requires service as there is no user servicable part inside.

Posted on Nov 21, 2008

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Posted on Jan 02, 2017

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When making a copy on our Canon copier (super G3; image class MF4150) we are getting a vertical black line down the entire length of the paper. Is there something we can do to fix it? SG


You can fix this yourself by cleaning the scanner glass. When you insert a document to make a copy it is pulled in and travels over a thin strip of glass. When something gets stuck on this glass it is read or scanned as a solid line. What you need to do is make a copy. Then put that copy in the feeder the same way you put the original document in. Now the line on the copy will "line up" with the area of the glass that has something stuck to it. Use this as a guide to pop open the feeder cover, locate the glass and clean it with a cloth dampened with a bit of glass cleaner. Once you have it cleaned just run a copy again and the line should be gone. Sometimes a small flashlight helps to locate the glass.
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Most likely a fax has been sent or a page copied with 'white out' (Liquid Paper), still wet on the page. As the page feeds over the scanner, (a narrow strip of glass that runs across the width of the page along the feed path) the wet liquid paper comes off on the glass as a thin line and dries. Thereafter, when copying, scanning or sending a fax, the scanner light does not go through the liquid paper streak and the result when printed is a thin vertical line that runs the full length of the page. If this is the cause you will also find that faxes you send to other people will also have this line (although faxes you receive are not affected by this problem with your machine).

To fix the problem: follow the path that the paper travels when sending a fax or making a copy, until you find the scanner (narrow glass strip). Take a clean, soft cloth and a small amount of methylated spirit (or white spirit) and remove the now dried Liquid Paper from the glass. Clean the whole strip ensuring that the glass is left clean and dry.

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This sounds as if you have some ink/contamination on the small scaning glass that sits to either the left or right of the main glass on the copier.(Depending on the model/make)As your original is scanned over this thin piece of glass the scanning device will see any spots and this will result in a black line down the page.Please clean the glass with a soft rag.

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Does the same thing occur with a different document.. Because it is not repetative, it leads me to believe the line is being drawn at the direction of the software. Try printing a test page, and see if the line appears. If not the issue is from within the word processsing software. It almost sounds like a legal template for a pleading..

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If the lines only appear when using the top feeder, then theres probably white-out or something on the thin strip (called a slit glass) of glass on the left of the large glass.

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