I'm having an issue with my cyan head at the moment, no ink printing out of the left side, so i switched to uni-directional printing until i find a solution. When you print uni-directional is it only using one side of the head or is it still printing out both side but just in one direction instead of two? I was told that printing uni-directional will only let the printer print from one side of the head, but after printing a few jobs im questioning that because my color is coming out wrong.