My Canon i475d printer stopped printing Black and after I tried to clean the printhead, the Colour now didn't work either.
I've now replaced the printhead with a new one, but it still fails to print - is the machine's life over or has someone got a solution?
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There's a couple of things, the printheads wear out and need replacing now and then which is probably your problem, also there's an update to the printers firmware available to Canon service centers which helps the purge assembly clean the black even better. The printhead is QY6-0052-000 aprox. $50.00.
A worn out printhead can allow inks to contaminate each other, after cleaning you need to check your cartridges, if yellow is a brown color, you are getting contamination and need to replace the printhead. Black is hard to tell but when cyan gets too dark it's contaminated as well.
After nightmares myself - I eventually took the printhead out with the cartridges still in - get an old towel or loads of tissues and wrap around the bottom of the printhead so you dont get ink all over yourself - try not touch the green bits - then blow through the tiny holes on top of the cartridges. After a while youll hear a splat - and will see the ink has blown through - wipe clean - put ink head back into printer - re-align printhead and try printing. After 3 weeks of mine not working/printing this made it work again! hope this helps!