Canon MX720 Series Online Manual page 111

Important
Do not open the ink cover while printing is in progress.
(6) When the message "Did the patterns print correctly?" appears, confirm that
the pattern is printed correctly, select Yes, then press the OK button.
The input screen for the head position adjustment values will appear.
5. Look at the first pattern and adjust the print head position.
(1) Check the printed patterns, and use the
pattern in column A that has the least noticeable vertical streaks.
Note
If it is difficult to pick the best pattern, pick the setting that produces the least noticeable
vertical streaks.
(A) Least noticeable vertical streaks
(B) Most noticeable vertical streaks
button to input the number of the