Canon S400 User Manual page 252

Make sure Cleaning is selected, and then click the
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When a confirmation message appears, make sure that the printer is
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turned on and then click the OK button.
Print head cleaning begins. (It takes about two minutes to complete print
head cleaning and the POWER light stops flashing.)
Print a Nozzle Check Pattern to confirm the success of deep print head
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cleaning.
Printing a Nozzle Check Pattern
Printer Maintenance
icon.
Using the Macintosh Printer Driver 252