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While printing,air pump pushing pressured air in to the cartridge bank to force ink out through ink tubes tubes..During this process any leak at the cartridge neck or blockage in cartridge needle causes leak. Remove all cartridges check two needles inside the ISS unit for each.. upper needle allows the ink flow in to the pipes and below needle pumping the air inside the cartridge bank..If any blockage in upper needle causes ink leak. My sincere advise to the users better replace ISS unit & stop printing for further damages..For Tech guys only: Remove ink supply station along with ink tubes out,gently detach both tubes(magenta), you can see the needle other end pump syringe alcohol with the help of syringe, do this process up to free flow.. once confirmed refix tubes back, ensure that no leak should not happen.. fix all back.. try...This advise purely professionals can perform.. others strongly cautioned.
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.
So far the overspill opf black ink seems to have stopped. Do do this I dismantled the Hewlett Packard G55 by taking off the end panels, the back locking panel and the back. I then removed and unplugged the scanner top. There are only about four identical cross-head screws and two 1/2" springs belonging to the lift mechanism for accessing the print-ink carriage.
I found that warm water got rid of the encrusted and gooey ink deposits from the panels and so, gritting my teeth, I adventurously and foolhardily held the printer chassis under the running kitchen tap. A vast amount of black ink came flooding out which gradually lightened to clear water. Then I dried the panels and the worst of the chassis wetness and allowed the lot to dry properly in the sunshine. Reassembled the whole unit, powered up and it is still working. Though whether the ink overflow will return remains to be seen.
It probably is not leaking. There is probably a wad of ink hanging on the bottom of your cartridge carriage. Try to clean that up. It is possible that the cartridge is leaking, in which case, a new cartridge, at about $40 will fix it.