Canon PIXMA MX870 - Manual (Page 153)

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 remove the print head alignment sheet on the Platen
Glass until adjusting the print head position is completed.
If the message "Failed to scan head alignment sheet." appears, press the OK button.
Refer to " Troubleshooting " in the on-screen manual: Advanced Guide .
(3)
When the completion message appears, press the OK button.
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
To use other available functions, press the corresponding mode button.
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:
Advanced Guide .
To print and check the current head position adjustment values, select Print the head alignment
value on the Maintenance screen.
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Page 153 of 1127 pages Aligning the Print Head