Canon MP270 series On-Screen Manual page 552

When you have entered all the necessary values, click OK.
Note
If it is difficult to pick the best pattern, pick the setting that produces the least noticeable vertical
white streaks.
(A) Less noticeable vertical white streaks
(B) More noticeable vertical white streaks
If it is difficult to pick the best pattern, pick the setting that produces the least noticeable
horizontal white streaks.
(A) Less noticeable horizontal white streaks
(B) More noticeable horizontal white streaks
9.
Confirm the displayed message and click OK
The second pattern is printed.
Important
Do not open the Scanning Unit (Cover) while printing is in progress.
10.
Check the printed pattern
Enter the numbers of the patterns with the least amount of streaks in the associated boxes.
Clicking the patterns with the least amount of streaks in the preview window, will automatically set
their numbers in the associated boxes.