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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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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A thin line also appears on the photocopy.why and what is the solution?


The page goes thro the feeder mechanism and passes over a thin strip of glass; maybe about 1/4 inch wide and runs across the fax under the cover where the paper is fed. You probably have dirt,corrector fluid or something like that on the glass this will cause the problem of a black line down the page to appear at the other end when you send a fax...and also to appear on your pages when you make a copy...open up the machine and clean the glass...cant help any more as you didnt state make or model.

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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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If the marks look like brushstokes all over the page, then it most likely needs a drum GPR-6. Black marks can be caused by a dirty **** glass (the thin one) as well. the easyest way to tell is if the black lines are only on copies that went through the feeder and not on print jobs, faxes,or copies made off the glass then the **** glass needs cleaned.

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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.

If it appears when you put a document on the large glass, then it is another problem.

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