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The black ink is a pigment based ink, that is it consists of particles suspended in a solution. The colors are dye based and have no particles. This being the case when the black ink dries and clogs the print head the particles are left behind. I would suggest removing the print head and letting it sit on a paper towel moistened with warm distilled water. Do this on a surface that is both waterproof and disposable, i.e. a plastic disposable plate, since the hope is that ink will flow out. Let this sit for about 20 mins, reinstall print head, making sure the electrical contacts and clean and dry, then the cartridges and try cleaning cycles again. If still no luck replacement print heads are available at the address below.
Please check the black ink cartridge
1 The ink may have finished. Replace the cartridge with a new one
2 It is not seated properly in the print head.
3 Also check if the thin plastic film(so that ink does not dry up in packing) covering the ink pad in the cartridge has been removed
Do you mean the large black ink as in the 3e vs. the 6? If so, the large black, 3e, is a pigment based ink and the printer should only use it when print text and black and white things. The 6 black is a dye based ink and the printer should only use it when printing photos.
One tank is reserved for colour printing and the other one is for grayscale printing ( Black and white). Watch out as when you run out of ink and you keep trying to print a document with empty tank cartridge it will cause your print head to go bad. The cost of a new canon print head is the same as the cost of a new printer. Canon over priced the print head.
Okay, this was the problem I posted a few days ago. It's fixed now, so in case you have the same problem with smearing, here's what the help desk from Canon suggested: Open the cover and remove the ink cartridges. There is a gray lever in front of the cartridges. Lift this lever and the printhead can be easily removed.
Our printhead had a buildup of black ink on the surface. I carefully removed this with rubbing alcohol. I let the printhead dry and replaced everything. No more smearing. Imagine a help-desk that actually helped!