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HP OfficeJet Pro 8730 All-in-One Printer

Hallo to all. I am an owner of HP Officejet pro 8730 printer, out of warranty, bought in Greece. A couple of months ago my printer's printhead (hp 953 - M0H91A) broke down. So I bought from e-bay (China) a secondhand refurbished one (hp 952). Unfortunaly my printer doesn' t recognize it and I get the message "printhead appears to be missing, not detected or  incorrectly installed". I bought another one refurbished printhead and the same thing happens. Meanwhile I bought a brand new HP Officejet pro 7740, that uses the same printhead with 8730. I tested the 7740 printhead on 8730 and the printer was operating perfectly. Any idea what is going on with the refurbished printheads? Is there any tip to save my old printer, using the refurbished printheads?

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