Canon PIXMA MG4200 Series On-Screen Manual page 146

5.
Examine the nozzle check pattern.
Examining the Nozzle Check Pattern
If the problem is not resolved, turn off the power and clean the print head deeply again after 24 hours.
If the problem is still not resolved, replace the FINE cartridge with a new one.
Replacing a FINE Cartridge
If the problem is still not resolved after replacing the FINE cartridge, contact the service center.
Note
Press the HOME button to exit Setup and display the HOME screen.
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