Canon S400 Reference Manual page 105

Print a nozzle check pattern.
Nozzle check pattern poor quality?
Execute normal print head cleaning.
Nozzle check pattern poor quality?
Execute deep print head cleaning.
Nozzle check pattern poor quality?
Replace the BJ Cartridge.
Execute print head alignment.
Printing a Nozzle Check Pattern
Cleaning the Print Heads (Normal print head cleaning)
Cleaning the Print Heads (Deep print head cleaning)
Replacing the BJ Cartridge
Aligning the Print Head
When to Replace a BJ Cartridge
Routine Maintenance 105