Canon MG7100 series Online Manual page 203

Important
Do not open the operation panel while printing is in progress.
7. Look at the third 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 horizontal stripes.
Note
If it is difficult to pick the best pattern, pick the setting that produces the least
noticeable horizontal stripes.
(G) Least noticeable horizontal stripes
(H) Most noticeable horizontal stripes
(2) Repeat the same procedure until you finish inputting the pattern number
for columns b to h, then tap OK.
The manual adjustment of the print head position is complete.
(3) When the completion message appears, tap OK.
The screen will return to the Maintenance screen.
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