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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
The black is the first to wear out on these printheads, you will need a new printhead, QY6-0049-000.
You will only waste inks trying to clean or deep clean, the best bet is to replace the printhead and if all else is ok you will get many more trouble free prints and better quality color prints.
You probably need a new printhead, but that problem cann also be caused by the purge or cleaning station not working properly. If you do a cleaning cycle with no carts. and the little pads in the printhead come back with no ink on them then the purge is working and you need a new printhead.
installed a new Print-Head, but that was no changes. I use refill ink, and it seams the BlackInkTank is not exactly on the Printhead and it is Air in the Pipe, i take the Printhead and the Ink-Cardridge in the Bathroom, and press the Ink-cardrige on the Printhead and take a hard breath and blow in the Air-Holes of the Ink-Cardrige until black ink come out of the Printhead, reinstall in the Printer, end it works well.
it could be a problem with your print head in the printer or the purge unit. printer head problem u can fix your self by ordering a new print head from your canon printer supplier. as for the purged unit u need to have the printer looked at by a canon service agent