arnikoboeke3 years ago000Why can't I find a print head for the PRO 7740? Even when I put in original cartridges, it says it's not original. Sometimes it doesn't recognise the colours, sometimes the black. What is the solution?Show in original language (German)conny.schuerpf3 years ago • purchased this product000purchased this product Helpful answerGood evening, had no problems, maybe repeat process several times.Show in original language (German)Comment1 comment