Question about Canon PIXMA MP780 All-In-One InkJet Printer

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Line down the middle of the page

I have a Canon Pixma MP780. I have cleaned the glass on it multiple times. No matter how clean it is there is a line that goes right down the center of my paper. Its a light black almost grey color. It just started doing this about 2 weeks ago. I think it has something to do with our carpets being pulled up and dust getting into it. There is dust under the smaller glass area that I can't clean.

Can anyone give me a solution.

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  • Nauticalse Jun 10, 2008

    Yes it is only on scanning and copying not when we actually print out something from the computer.

  • Daddie0 May 11, 2010

    I am assuming the line is on scanning/copying?

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SOURCE: canon pixma mp780 - vertical line on printing

There are a number of issues that cause vertical lines in printing. If you have cleaned all the glass panels and roller,the next primary cause is a blocked printhead but people have success cleaning and refilling cartidges as I do. How old is the cartridge, as they do eventually wear out due to the printhead points wearing out(hold the cartridge to the light and look on the printhead, do the points appear scratched or white dots? This indicates replacement. How much ink is left? When black ink is low but not low enough to show a message, sometimes vertical lines can appear. Try checking ink status, or try refilling ink if you know how. If this issue reoccurs with a new cartridge it more than likely could be the printers printhead and not the cartridge. Cartridges can become clogged if not printed with for a while. Try standing the cartridge on newspaper for a while. Blot it dry and retry it.

Posted on Aug 09, 2007

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SOURCE: paper jam light constantly on.

The suggestion with the heavy stock paper worked. I used a vanilla folder but this was not heavy enough so I simply folded it in half. I had the problem where it would feed 1 sheet of paper in the auto sheet feeder upon starting the printer up. This is unusual in itself. The single sheet of paper would go through normally. But with the vanilla folder, as it was going through, I heard a loud sound like a contraption somewhere was being reset or dislodged or relodged or relocated from some stuck position. After the sound, the green light came on no problem and it all worked. Try something not so heavy like a vanilla folder that has been trimmed down. Then fold it. You might have to hold it up against the black roller wheel to get it to engage the roller wheel when you turn the printer on. Hope this helps.

Posted on Aug 25, 2007

  • 518 Answers

SOURCE: canon pixma mp780 printing problem

Try replacing the color cart. with a NEW one.

Hope that helps...

Geno

Posted on Mar 26, 2008

  • 1 Answer

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i need the software for a canon pixma mp780 printer thank you

Posted on Nov 03, 2008

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SOURCE: Thick black line on printed page

If the line runs the way that the paper does I.E. vertical on a portrait then it is dirty rollers normally.
If you open the lid and wipe the rollers this shoukd reduce or eliminate the black lines.

Posted on May 03, 2009

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I finally figured out why things that I coped with the ADF had lines/marks on them, but those placed directly on the platen (glass) were fine. When you copy with the ADF, the copy is not being made from the large glass area. Rather, there is a thin glass area right next to it.

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http://www.nodevice.com/manual/newmans/1164257699mp750780smpdf/get13922.html

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