I have a Canon MP780 printer just over a year old and out of warranty. Just recently, after sitting for a day or two, the black ink started bleeding into the yellow cartridge. I replaced both black cartridges, but after a few days it happened again. Has anyone seen this behavior before? Could the cartridges be bad? I have purchased from the same manufacturer (after-market) for years with never any problems before.
Deep and regular cleaning cycles can clear up the problem temporarily but it happens again after a while. Should I try a water cleaning as suggested on some sites? I actually don't understand how cleaning could help with this problem. The printer prints very nicely until this problem recurs, then a nozzle check shows the yellow band all in gray (but no streaks), just as you'd expect if a yellow cartridge had black ink mixed in.
Deep and regular cleaning cycles can clear up the problem temporarily but it happens again after a while. Should I try a water cleaning as suggested on some sites? I actually don't understand how cleaning could help with this problem. The printer prints very nicely until this problem recurs, then a nozzle check shows the yellow band all in gray (but no streaks), just as you'd expect if a yellow cartridge had black ink mixed in.
