Canon MG7100 series Online Manual page 200

The confirmation screen will appear.
Note
To print and check the current head position adjustment values, select Print the
head alignment value.
(4) Tap Yes.
The print head alignment pattern is printed.
Important
Do not open the operation panel while printing is in progress.
(5) When the message "Did the patterns print correctly?" appears,
confirm that the pattern is printed correctly, tap Yes.
(6) Confirm the message, then tap Next.
The input screen for the head position adjustment values will appear.
5. Look at the first pattern and adjust the print head position.
(1) Tap A to check the printed patterns, and tap the number of the pattern
in column A that has the least noticeable vertical streaks.
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