Canon PRO-10 Series Manual page 561

Note
If it is difficult to pick the best pattern, pick the setting that produces the least noticeable vertical
white streaks.
(A) Least noticeable vertical white streaks
(B) Most noticeable vertical white streaks
11.
Confirm the displayed message and click OK
The third pattern is printed.
Important
Do not open the top cover while printing is in progress.
12.
Check the printed pattern
Enter the numbers of the patterns with the least amount of streaks in the associated boxes, and click
OK.