dear friends, I solved the problem. was actually obstruction by air.
the printer has a resource for the problem, under Maintenance, under System Cleanup.
is the ultimate maintenance feature, and the one who spends the most ink, on average, 25% of the ink reservoir per use. in this case, those of...
I don't know what is happening, the color print is not good, it seems that lack some colors.
see in the image how is printed:
here is the original image: