Canon 4204B019AA User Manual page 115

Important
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 the message "Failed to scan the head alignment sheet" appears, press the
Refer to " Troubleshooting" in the on-screen manual: Advanced Guide .
Note
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.
For details, refer to the on-screen manual:
To print and check the current head position adjustment values, select Print head align
value in the Maintenance menu.
.
Advanced Guide
OK button.
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