Canon mp620 - Manual (Page 99)

(6) Check the printed patterns, use the (Left) or (Right) button to input the
number of the pattern that has the least noticeable stripes for each column from
"a" to "j", then press the
OK button.
Note
If it is difficult to select the best pattern, select the pattern that has the least noticeable
horizontal stripes.
(E) Least noticeable horizontal stripes
(F) Noticeable horizontal stripes
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Page 99 of 815 pages Aligning the Print Head