So I have a Roland xc-540 and it doesn't get used a ton but does gets used and I do keep up on maintenance. I hadn't been used in a few weeks and went to run a print and the test print showed the whole left side of the cyan print head was missing. There wasn't any ink what so ever on that side. I ran a test print again with no progress. Ran a few cleanings, normal and powerful a few different times with still no progress. At that point a dug in further and opened it up to check the dampers. Both dampers were full and I was able to pull off the cap top tube and pull ink through with a syringe. One thing I did notice was the two cyan feed tubes that go to the dampers, one looked full (or I just could see through it) and the other had about a half inch of ink above the damper. I don't know if they are suppose to be full or not. I have about half full ink cartridges and I made sure they were seated in there properly.