If print quality has declined and the nozzle check pattern
indicates clogged nozzles, you can clean the print head.
Note: Your printer
automatically checks the print head nozzles when the printer is
turned on and before printing; and cleans them when it detects
clogged nozzles. To change this setting, select Settings > General
Settings > Printer
Settings > Self Check and
Cleaning.
Note: You cannot
clean the print head if an ink cartridge is expended, and may not
be able to clean it when a cartridge is low. You must replace the
cartridge first.