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

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Printing - Black ink not filling in completely

Printing, just in black, is not complete.  Blank stripes running through the lettering.  Have done tests, cleaned heads, test print looks fine.  But then when I go to print the document, it has slashes of missing black.  Color seems fine.
Have been using the same type of cartridges for some time.  Changed out to a new one.  No difference.  Cleaned the holes with a bit of alcohol.  Seemed to help, then regressed.
TY!

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  • Meetoo Nov 12, 2007

    Took it in and the purge assembly was cleaned. they said the print head was fine. Worked beautifully for a week and began doing the same thing. Taking it back in again today to the repair shop.

  • Meetoo Nov 13, 2007

    Have had it about a year and half now. Love it when it works. Shop switched out the generic black cartridge, wiped out the inside again, put in a Canon cartridge and it worked just fine.

    First problem I have had with the generic cartridges. Have used them from almost the beginning. Shop Guy hates them. Spoke to another tech, he said there isn't much difference. Will change it out and see what happens. TY!

  • drossshaw Nov 25, 2007

    My printer won't print black. All the colors are fine. I have swapped out cartridges but still no black will print. Any ideas?

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Does the test page come out good or the same?

Posted on Nov 12, 2007

  • Thomas Christopher
    Thomas Christopher Nov 12, 2007

    good idea.How old is the printer? If it is under warranty, let them mess with it.

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