Can anyone help explain,link to diagrams etc. that will help me visualize how the print heads are filled with ink? I am having problems with an ink not priniting and have tried everything,replacing head and running all diagnostics and cleaning. I have look at the service manual...but don't quite understand how it works. I figured I could try to clear any internal clogs etc. on my own...as repair service is not worth it...spending over $1000 or so just to get it working again. Any info greatly appreciated.