Canon PIXMA iP90 Quick Start Manual page 62

Printing Maintenance
4
Align the Print Head.
(1) Look at the print out. From the patterns, select the most even, least irregular
patterns.
Note
Less noticeable white stripes
(4) When the confirmation message is displayed, click OK.
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If it is difficult to pick up the best pattern on Column H, pick the setting
that produces the least noticeable vertical white stripes.
(4)
After the pattern is printed, click Yes.
(2)
Enter the numbers.
(3)
Click OK.
More noticeable white stripes