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I am having the same problem with my MP780 mine started doing the same thingafter deciding to use Calidad inks the large black ink leaked into the yellowink (stick to canon inks).
What I have done so far with no success - Replaced the ink cartridges with new ones supplied by Calidad, still the sameproblem. Removed and cleaned the print heads manually and to my surprize after soakingin warm water and multiple cleanings for over 1hr black ink is still coming outof the yellow ink head. I still get the same message after all I have tried...
One thing I did manage to do is prime the yellow ink and got it flowing throughthe head again but it's still mixed with black... I wonder if you may have runout of magenta and dried the head...
Try priming the magenta ink by removing the head (don't touch or wet the metalcontacts at the rear, the ink heads are on the bottom) place on a clean lintfree cloth (or I just used damp tissues then dry tissues) you should get onelong black strip and two cyan, two magenta and two yellow strips on the tissue,if you do not then try priming by replacing the magenta cartridge and gentlypumping the cartridge up and down repeat until you get the ink flowing.
Replace the head and cartridges, press ok, turn the printer off then reset.
Let me know if it works or if you come up with another solution that works as Iam still trying to figure out how to fix mine.
Have you checked to see if the jet area on the bottom of the ink cartridge has a blackish sludge on them? It might be that the area that the print cartridges are purged/cleaned to one side of the printer (sometimes called a service station, or spitoon) has built up excess ink that has gotten thick and high enough that as the carriage goes over that area the bottom of the cartridge gets polluted with the blackish sludge. It will work slightly into the jets where the ink comes out and cause discoloration, even after you change the color cartridge. Open the unit to look inside with a flashlight for build ups and clean it (if you find some) with disposable things like cotton swabs, coffee stirrers, whatever you have that wont damage anything inside. Another cause could be mixing of the cyan and magenta and yellow somehow inside making a dark color representing black - but replacing the cartridge would cure it immediately.
Go to printer maintenance and perform deep cleaning,do it for 3 times the if it doesn't clear the error, try to look for a chemical solution that can be use to unclogged printhead. Remove the printhead on the printer then soak it but don't dip the whole unit it might got wet the board of the printhead. You can also put some cleaning solution on your old cartridge without removing the printhead on the printer. You must put the solution of course on the magenta only. Let it there for 12 hours then perform a test.
I read a lot of complicated stuff about cleaning the print head after my similar problem this week. Finally I found an old, soft toothlbrush, gave it a very light spray with windex and lightly brushed the magenta print head. I put the cannon cartridge back in and everything is printing perfect again. This worked for me, good luck to l you.
the problem is very simple the magenta ink the cartridge is over or the head is been blocked from where the magenta ink comes out,
because red colour requires ---yellow plus magenta(pink)----to make it red.and ----dark yellow plus magenta(pink) -------- for brown colour.