Canon 3747B003 User Manual page 706

Important
Do not open the Document Cover or move the loaded print head alignment sheet until
scanning is complete.
If adjusting the auto print head position has failed, Failed to scan. appears on the LCD.
An Error Message Is Displayed on the LCD
Note
Press the HOME button to exit Settings
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
Select Head alignment print to confirm the current head position adjustment values.
menu and display the HOME screen.
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