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

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3eBk will not print. Canon MP780

I have tried all of the methods listed,
Head Cleaning
Deep Head Cleaning
Windex (window cleaner)
Local Cartridge World shop where I get my cartridges also cleaned it FOC.
Still no joy.
Would replacing the Print Head work?
Any other ideas welcome.

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Replacing the printhead may work, but it could be a problem with the cleaning assembly. Take out the 3ebk and run a cleaning, if the ink goes away on the pad where the ink cart. goes, then clean assy. is OK, and you need a new printhead.

Posted on Jul 14, 2009

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I have had the same issue, even after replacing the print head with a new one, the 3eBK cart did not work.

  • If you are having issues with ONLY the 3eBK cart,
  • and have used non CANON carts at any time,
  • have tried cleaning the print head, only to find it helps temporarily or not at all
then the issues is the kind of ink non-CANON carts use. The big 3eBK cart is a pigment ink, the little one is a dye ink. you can read more at this link
http://www.nifty-stuff.com/forum/viewtopic.php?id=1275
but the basic thing is you need pigment ink in the 3eBK. Once I had a cleaned head (I had to clean my brand new one because I ran an offbrand 3eBK through it thinking the head was the issue), then pick up a OEM Canon 3eBK and try it out. This worked for me immediately. Now if it works down the road you can buy real pigment 3eBK that is not from Canon, but thats more a trick to find.

I had this issue for weeks, my wife was insisting we get a new printer. now the 780 is working great, and I am saying away from cheap dye (photo black) 3eBK carts. hope this helps someone else.

Posted on Nov 18, 2009

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