Question about Canon PIXMA MX850 Multifunction Printer

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Solid wet black line on back of pages

I continue to get a solid wet black line on the back side of my documents

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  • Lynne Tamor Apr 16, 2009

    For the past few days, I have also been getting a wide black streak (vertical) down the back of every page.

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  • 33 Answers

What happens when you print with single sided document selected in the preferences? Is there more than one MX850 printer driver showing in the Printers & Faxes (This is Windows ?? XP ? 95 ? ). If so delete all of them and reinstall. Otherwise I would check a printhead alignment from the Maintenance menu to see if that solves it.

Posted on Apr 29, 2009

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1 Answer

Trying to print documents, white background with black typed words. Problem I have is the printed documents have solid dark blue and solid black ink and the words don't show.


Are the ink cartridges installed in the correct colour order?
Have you printed a test page through the printer's own control panel? What was the result?
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I have a Epson cx11 and get a black vertical line down the middle of scans and copies


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
So solution is clean the Document feeder scanning glass using wet cloth, note careful about wet cloth switch off the machine and clean it

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My scanner is now adding a page with a black line that runs from top to bottom of the page and the actual document scanned is page 2. But the document is fine with no line through it. Does this mean that...


Check your scanner software settings. It is probably set at duplex ever time you start to scan. That is why you get two pages for every pass, the front and the back. You must place the document in the feeder in a way that the front side of the document is page 2. You may want to flip it next time you scan. So the main question is why there is black line from top to bottom? That is because there is a piece of dirt stuck on the glass of the scanner. You see, this scanner actually does two scanning when a page runs through it: the front and the back in duplex mode. So there are two scanners in side the box. The front page scanner apparently is dirty and needs to be cleaned with clean cloth and lens cleaner.

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Try checking the corona cleaner on the drum unit. It should be slid all the way to one side. It is a little blue piece that slides back and forth. look for the arrow on one side and slide all the way to it. Not sure if that would cause solid black pages but I have seen it cause solid black lines on the page.

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A Solid black line down the left side of the page


It could be 2 things...

1. Your scanner glass is dirty...open the doc feeder and clean the glass. probably Wite-Out.

2. A segment of your scanner assembly lamp is burned out. Not good, uneconomical to repair.

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I'm pretty sure you might have solved this problem already, but this might help others.

Make sure that the platen glass is clean near the right side of the machine, where the document is scanned when going through the document scanner. Remember, when placing a document on the glass to copy it that way, you would place it on the glass on the left side of the machine. When scanning through the ADF, the scanning unit itself moves to the right side of glass and scans the document as it moves through.

We had the same issue and found out that there was a little spec of dirt on the glass. After cleaning it, the problem was solved.

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1 Answer

Blank vertical line on pages


open side door, should be a black assembly there with two wires, is it clean? is there any toner or hair on the wires?

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