Canon PIXMA MX870 - Manual (Page 152)

Important
Do not touch any printed part on the print head alignment sheet.
Be careful not to get the print head alignment sheet dirty. If the sheet is stained or
wrinkled, it may not be scanned properly.
(5)
When the message "Did the patterns print correctly?" appears, confirm that the
pattern is printed correctly, select Yes, then press the OK button.
5. Scan the print head alignment sheet to adjust the print head position.
(1)
Confirm the message, and load the print head alignment sheet on the Platen
Glass.
Load the print head alignment sheet WITH THE PRINTED SIDE FACING DOWN and align the mark on the
upper left corner of the sheet with the alignment mark
.
Note
The print head alignment sheet cannot be scanned if it is loaded in the ADF.
(2)
Close the Document Cover gently, and press the OK button.
Page 152 of 1127 pages Aligning the Print Head