Canon S400 Reference Manual page 128

4
When a confirmation message appears, make sure that the printer is
switched on and at least two sheets of A4 or Letter size plain paper are
loaded, and then click the OK button. The printer starts to print the stan-
dard head alignment pattern. During print head alignment, do not open the
front cover.
5
When this pattern is printed, click the Yes button.
6
Check all the patterns in lines of (B1) and (B2).
For each line enter the appropriate number where you see the lines per-
fectly aligned.
Correct:
Incorrect:
Aligning the Print Head
Routine Maintenance 128