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Message: [QUOTE="ArminLinder, post: 231100, member: 27911"] Hi all, I recently found a phased-out ET-4550 which spent approx 2 years without being powered. It seems it has been dumped because of the well-known "waste ink full" problem. I reset the waste-ink counter and now it seems to try to print again. It seems however, the ink has dried. Whan I first tried the printer, I printed a test page and it was sprinkled with coloured pixels with the test patterns being dimly visible. I tried standard and deep print head cleaning, but the effect was adverse, right now no colour at all lands on the paper any more, the sheet comes out of the printer perfectly white. A clogged print head, maybe? But if so, why did it work to a certain degree on the first sheet then? A OEM replacement print head for this unit is remarkably cheap, but I hesitate to buy one because it can very well be that the print head is fine and the ink supply is the problem. The main ink tanks are almost full. I dismounted the print head cover and had a look at the small white units attached on top of the print head (4 of them, see picture). Inside each of them I see a little bit of fluid ink, but the chambers are mostly empty and filled with air. A lot of questions arise at this point, I never had a printer of this kind. Should the chambers be completely filled with ink? Is there a "bleeding" procedure? Would it be worth trying to drive the air out of the chambers and the attached ink supply hoses, e.g. using a syringe? Any other suggestions, or maybe a big time-saver: "throw it away, it's a waste of time"? Thanks for your time and advice, Armin [/QUOTE]

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