Question about Canon PIXMA MP830 All-In-One InkJet Printer

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Heavy black line

Getting a heavy black line on the underside of the printed page. Have performed all the listed cleaning functions, but cleaning the bottom roller seems to take care of it. Problem is, it keeps coming back. Shall I give up and trash the printer (one and 1/3 years old) or is this fixable?

Posted by jill welch on

  • jill welch Jun 21, 2007

    Inky: I don't see a foam pad under the track, just a roller and some wheels

    McCuskerCo: I have replaced the ink cartridge more than once. Is that what you mean by drum/cartridge?

    Thanks for both comments. Appreciate the effort.

  • davidduc Dec 24, 2008

    Cannon printer MP830, get heavy black strip on back of paper. after cleaning the bottom plate several times via the maintenance routine, it looks good and clean, but after few minutes, the problem returns.



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Run the "Clean Bottom Plate" routine under the "Maintenance" tab. I ran it about 8 times and it finally got all the gunk out.

Posted on Feb 01, 2008



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I am having this same issue. I have replaced the ink cartridges (it is an inkjet not a laser so no drums as above mentioned), ran the bottom plate cleaning many times, and removed and cleaned the foam ink absorber that lays in the printhead track (it was not really dirty), lastly I cleaned the two porus absorbers at the end of the track where I assume the two black haeds "park". Any other ideas or suggestions?

Posted on May 27, 2008


Inky Fingers

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If there is a foam pad under the track that the print travels along, remove it (carefully - they tear easily) and wash it in warm soapy water. This helps on several Epson models but not sure if the Canon is the same.

Posted on Jun 21, 2007

  • Inky Fingers
    Inky Fingers Jun 21, 2007

    Sorry about my poor typing - it should read:

    If there is a foam pad under the track that the print **HEAD** travels along, remove it (carefully - they tear easily) and wash it in warm soapy water. This helps on several Epson models but not sure if the Canon is the same.



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Have you replaced the drum/cartridge in the unit. Sounds like the drum/toner cartridge unit is defective.

Posted on Jun 21, 2007

  • Anonymous Jun 25, 2007

    The unit is equipped with two black cartridges. The black for text is a large cartridge with a deep, black ink. The photo black cartridge is a smaller cartridge that contains an ink that looks more like a very dark gray. If you print any document with automatic OR manual duplex printing, the entire document will be printed using the PHOTO black ink. When you printing are you using the auto duplex mode?


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Is the line on the front of the page or on the back? If on the back, you need to clean the platten which is the piece of plastic under the paper.

If its on the front, and you say "It lools like a rubber cover may be missing off of one of the rollers", could you upload a picture of this roller? I don't recall any covers on rollers in Canon printers.

Try this, print out a blank page. If line is still there, print out 10 blank pages. If line is still there and has not faded, this is unusual and may need servicing. There may be a problem with the encoder strip (it's a clear plastic strip with black lines running the length of the printer slightly behind the head), Try cleaning it on both sides with a little windex on a q-tip. It's delicate so be careful.

If the line looks faded after printing 10 blank pages, some ink has dripped onto something that is contacting the paper. This could be a roller, the bottom of the head carriage or even a hair or piece if dust that is stuck in the machine or on the bottom of the head. In this case, I would recommend cleaning everything. Revove the head (tell the machine you're going to replace ink, and when it moves the head into the centre position unplug the power cord.

Remove the head and clean off any dust or hairs on the bottom. Run a Q-Tip along the bottom of the carriage assembly wherever you can. Clean any accessable rollers. If you can get at it, clean the wiper on the purge unit (the unit the head sits over when it is parked), as well as the seals.

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