Canon MG6400 series Online Manual page 176

(2) Close the document cover gently, then press the OK button.
The machine starts scanning the print head alignment sheet, and the print head
position will be adjusted automatically.
Important
Do not open the document cover or move the print head alignment sheet on the
platen glass until adjusting the print head position is complete.
If the error message appears on the LCD, press the OK button to release the
error, then take appropriate action.
A Message Is Displayed
(3) When the completion message appears, press the OK button.
The screen will return to the Maintenance screen.
Remove the print head alignment sheet on the platen glass.
Note
Press the HOME button to exit Setup and display the HOME screen.
If the print results are still not satisfactory after adjusting the print head position as
described above, adjust the print head position manually from the computer.
Aligning the Print Head Position from Your Computer
To print and check the current head position adjustment values, select Print the head
alignment value on the Maintenance screen.
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