HP Designjet 2500.3500cp Printer series - Manual (Page 237)

Troubleshooting
Solving Image-Quality Problems
11-17
Nozzles not printing
There are two ways to see this problem, it is easier to see the error from the first
check. See example D.
1 In the top pattern, marked with numbers, if the diagonally stepped lines are broken
in one or more steps it indicates that this specific nozzle(s) may be blocked and are
not printing. White lines will also be visible in the area fill at both sides of the
pattern.
2 Below the top pattern there is a set of horizontal straight lines. When one or more
nozzles are not printing the corresponding lines will be missing.
10
70
130
190
20
80
140
200
Missing Line
Missing Line
Example D