Canon MG5100 series On-Screen Manual page 746

Do not open the Document Cover or remove the print head alignment sheet on the Platen
Glass until adjusting the print head position is completed.
If adjusting the auto print head position has failed, Failed to scan head alignment sheet.
appears on the LCD.
An Error Message Is Displayed on the LCD
3. When the completion message appears, press the
The screen will return to the Maintenance screen.
When adjusting the print head position is completed, 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 a computer.
Aligning the Print Head Position
To print and check the current head position adjustment values, select Print the head
alignment value on the Maintenance screen.
OK button.
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