I encountered issue that the cyan printerhead may have some issues in my officejet pro 6978. I replaced two new cyan cartridges but the blue color still printed as pink/yellow, no blue or green color can be printed. I tried printing and copy functions, both gave the same results. The red/yellow/black color works fine. I used HP cartridges only, and I wonder if the printer can be fixed. It is a bit too expensive for me to buy a new similar model.
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