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When installing the cartridges, it is important
that you insert them from left to right with the black cartridge first and the magenta cartridge last. The reason for this is
because the magenta cartridge has a clip on top of it that goes into the
cartridge door sensor. The clip needs to push the sensor in
so the printer is able to function with the cartridge door open. If you
insert the magenta cartridge first, the printer will think the cartridge
door is closed and you will get a error message for the other missing
It is due to spilled magenta toner leaking from side to the toner cartridge. Take the cartridge out of the printer and clean it. Clean visible inside of the printer. Shake the cartridge lightly in horizontal position to evenly distribute the toner inside the cartridge and put it back. The issue sould be fixed after some prints.
Good Luck! Appreciate generously, if the solution could have been of any help! CreativeTECH
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.
The magenta print head may be blocked. Try several deep cleaning of the print head to
see if it can clear the blocked magenta print nozzles. Also check the magenta cartridge, make sure it is not empty. If none of this works then the print
head needs to be replaced. NOTE the print head is not a cheap item, you may
consider putting the money towards a new and better printer.
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.
The cartridge is only a tank that holds ink. The printhead is the device that you put it into and probably has a blockage in the magenta head. Open the machine so the carriage moves to the center. remove all the cartridges. TCT How to remove and clean Canon Printhead see the link below. The MX700 may have the locking mechanism at the front of the carriage, so you should move it slightly right and then pull the colour bar forward to release the printhead. carefully remove the printhead. Sit it in a shallow dish/tray of hot water for a few minutes and dry with a paper towel. Put it back in the printer reset the locking bar and cartridges. Try a nozzle check through the tools menu. Yoyu may need to repeat the process if the magenta printhead is badly blocked
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.