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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'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...