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

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Red vertical lines, scanning to computer

Scanning old but good condition photos onto computer, they all have red & black vertical lines. Have tried cleaning everything with no success, it gets worse each time I try.

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  • Anonymous Feb 02, 2009

    The right side of any scanned image is coming out in a pinkish red color regardless whether it is a word document or a color photo.



    email: tulled@unm.edu

  • Anonymous Feb 20, 2009

    red vertical lines across all of my photos i print from photoshop!

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I had one red line appear when i used the duplex. I happened to notice that the thinner glass window on the scanner was dirty. I cleaned it and now no line appears.

Posted on Jul 12, 2009

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THE BLACK SCANNED LINE IS PROBLEM OF THE SCANNER CARRIAGE AND HAVE TO BE CHANGE.

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Check your flat bed and Document feeder scanning glass need to be clean, if any dot or dust in scanning glass of document feeder it will appear a line, check this points first
1- Check printouts from computer or FAX if it is clean problem in scanning section
2- Check using Copying a blank paper using only Flatbed if it prints without any line its problem from document feeder Scanning glass
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Unknown if this is new installation, or old installation that went bad.
Old install, then check voltage is correct for rating plate, check that line power is not under-voltage, check that photo control receives enough light by shining 120Volt light bulb onto photo eye, replace photo eye
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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.

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When I scan 4x6 photos there is a line (sometimes green) across the entire photo that used to not be there. Scanning larger 8x11 photos the line does not show or when scanning documents. Help! I'm in...


If line is vertical.

Try scanning a bigger document. Use a blank page big as the scan capacity and scan the blank page.

If for example you are using an a3 scanner, scan a blank A3 page.

When scanning blank page set resolution to an high value, so that you does not lose pixels.

Check scan result, and explore the whole document using zoom to see if the line is still present on the test scan of the blank page.

If there is still the line, then it is either a scanner dirty, probably inside glass, or a dafective sensor on CCD sensor array.

If there is no line, then the problem is usually depending on the software.

In that case uninstall the software and install it again.

If that is not enough to fix the problem, try uninstalling software, doing a system restore to a date before the problem started , and then installing software again.

If the line is horizontal , that is usually a loss of power on the high voltage to lamp.
Try reinstalling software first, if that does not fix the problem , and line is horizontal, then it is fault mentioned above.
Horizontal lines at the end of a document may also be caused by faulty scanner control board, or scanner going out of memory.


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See previous fix for black lines problem is likely the same i.e fractures in the flexible cable between the scanning head and mother board, changing this cable will likely cure this fault.

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For this kind of problem you need to call the tech support because the printer is already messed up and it is in need of replacement

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When I put a doc on the glass to copy -the print has a black vertical line down the page. When I print from computer to print - it works fine - there is no line of ink. Can I fix this myself? What would u...


A long black line on scanned images is usually caused by a piece of trash on the scanning mechanism.
Look at the scanning arm (the thing that moves when you scan something) and then see if it has any trash on it. If it looks good then you may have a mechanical malfunction in that part.
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did u check that? maybe its switched to the black and white option

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