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T120 Faulty ink despite changing several times

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HP DesignJet T120
macOS 10.12 Sierra

We've recently changed the black ink (K) on the T120 but were immediately prompted there was a fault with the cartridge. Having changed it to several new cartridges (which we're sure are the correct ones), the same message appears. 

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You will need to replace the printhead C1Q10A to make your printer work again.


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