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Had all new dampers, but turns out the black one had a pinhole in the clear film, thus losing its ability to stay primed.....wasn't leaking , but sucking in air. Was near impossible to see, but tenacity and perseverance almost always pays off. :rock-n-roll:

Have changed the pump, the cap tops, the dampers & syringed them. Start printing and the damper drains... the black tube empties??? Simply cannot keep black flowing from cartridge... Anyone have any ideas? Have owned this since new, has worked flawlessly for near 7 years. It started printing...