I have just completed a nozzle check on my ipf 6400. All the blocks appear to be printing fine except that there is nothing at all in the bottom half of the 10th block (counting left to right, top to bottom), as follows:
1 2 3
4 5 6
7 8 9
10 11 12
The top of this block appears to be light gray. But there is nothing in the bottom half. Would appreciate some help:
What does this mean?
What should I do about it?
Mike