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HP z3100 won't print colour.

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HP z3100
macOS 10.12 Sierra


My Hp Z3100 wont print colour. I cant figure out why. It has been unused for a long time. I suspect the tubes between the ink cartridges and the printheads are blocked, I am thinking of fitting the HP maintenance kit, thus sorting out that  problem. It is an expensive kit to take a chance on. Anyone out there able to offer advice, it will be gratefully received. 

Thanks Barry

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Your issue could just be the printheads or a driver setting. Did you run a printhead calibration from the printer control panel to see if you get any color. If only black remove the color printhead and press against a damp paper towel and see if you get color lines. If no lines the printheads are bad.

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