Canon MG6400 series Online Manual page 173

The nozzle check pattern will be printed.
(6) When the completion message appears, press the OK button.
The screen will return to the Maintenance screen.
5. Examine the nozzle check pattern.
Examining the Nozzle Check Pattern
If a particular color is not printed properly, replace the ink tank of that color.
Replacing an Ink Tank
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, the print head may be damaged. Contact the service
center.
Note
Press the HOME button to exit Setup and display the HOME screen.
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