Canon S450 User Manual page 262

When this pattern is printed, click the Yes button.
8
Print head alignment pattern
Check all the patterns in lines of (Y), from (X1) to (X6), and from (B1) to
9
(B2).
For each line enter the appropriate number where you see the lines
perfectly aligned.
(Y)
Correct:
Incorrect:
(X1) (B1)
Printer Maintenance
Using the Macintosh Printer Driver 262