OK so I know it's and old machine but it has been great for us until now. BLACK print head was banding and not laying down much ink. Have done all I know how to do. Have back wash head made sure the line was supplying ink (can draw ink thru with a syringe ). The print head simply will not draw ink. if I inject ink directly into the head it will print perfect until that ink runs dry then it will no longer draw ink. Is this a dead print head or am I missing something. I'm confused why it will print when I put ink into the head but it will not pull ink from the machine. HELP.....