Question about HP DesignJet 755cm InkJet Printer

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755cm HP Printer will not print black. grainy dotty prints.

Hi, When I recently purchased a 755cm all colours and black seem to print fine, I am now having a major problem..... All cartridges are full, it recognises all cartridges but it will not print any black. The images I am sending to the printer are coming out filled with little dark dots looking very grainy. I printed a test page and put a different black cartridge in but it still the same, the printer recognises there is a cartridge in but it will not print black!! I have cleaned the printer and cartridge strips but still not joy.... It was working fine two weeks ago, Although I was only printing text so not sure if it will still be dotty and grainy even if the black does get fixed. Please help....... All possible answers welcome, I need this printer working.... Thanks.

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  • tom cave Jan 18, 2013

    Is it the print head? Is it the settings? Is it the ink cartridge (tried 2 different ones)???



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SOURCE: hp officejet 6110 not printing with black ink

I think I know what is the problem. I refilled my black ink cartridge and it printed for a while, but at some point it just stopped working. The head wouldn't touch the paper. Initially I thought the printer had a problem, but then I discovered that the color cartridge still worked.I had a spare new cartridge so I changed it. Everything worked just fine afterwards. My hypothesis is that HP tracks an identifier in the cartridge and does NOT allow you to refill (I even think they simulate for the cartridge to be failing, but I still have to corroborate this). I think this is outrageous and illegal. Please let other people with the same problem know about it. So, the solution is to stop using HP products.

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