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Good Morning! Thank you for your quick responses! I did install a Mimaki pump - not a knock -off. The waste tank was full, but not overflowing. I replaced the capping station and the dampers last night. I think that was the problem (I hope so) but I won't really know until I get more yellow...

Me too I wish someone would answer this - I have the same problem with black!

I recently replaced the pump on the black/yellow lines to try to fix the black test print dropping out, it didn't fix the problem, but the next thing I knew - both full yellow 440 cartridges were empty and yellow ink was pooled on the floor. What could cause this?? It was printing yellow fine...

I did replace it with a similar spring that I had to cut down a little - the springs I found in my pens were too short. So far it seems to be working. I was able to carefully put it back together and it doesn't seem to be rubbing. I still have a problem with the left damper line not staying...

I've been trying to fix my JV3 myself with little knowledge. I'm really glad to find this site. The black head started partially printing the test print block. I replaced the dampers, but lost most of the black test print block. I discovered the black lines were empty at the pump so I suctioned...