|mmm... have to admit I'm not all aware of where to go next - other than ggogle-land; which is where I found these two...|
The first is tres basic and that it copies OK does tend to indicate the print head etc. is OK; but does the problem persist regardless of which application is printing? Also it refers to a different model but nonetheless the ideas may apply?
This second link is I feel way over the top - again as the print heads appear to be OK (It copies/prints ok)? But it may be useful to read and have about for whatever reasons?
Incidentally is it possible to specify black printing only; as opposed to the (default?) colour; and if so will it print then? I'm not familiar with your model printer which is why I ask