I have a Canon Pixma MP780 printer that won't print black ink from the 3e cartridge, all other colours print ok
The black is always the first to wear out on the printhead. If you are using a refilled cartridge check the side of the cartridge, if you can see ripples near the hole at the bottom then the blotter material has been pushed up inside and can't contact the filter in the printhead. If all is good you will need a new printhead, QY6-0049-000
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