Canon PIXMA iP6220D Service Manual page 20

[Main chassis adjustment]
After installing the main chassis, be sure to perform the confirmation test detailed below; confirm that the print
quality is proper and the ink cartridges are not contacting the paper.
<Confirmation test>
Using Photo Paper Pro, and with the paper thickness lever set to the left position (normal position), print an image
and confirm that the print quality is proper, and the ink cartridges are free from contacting the paper.
If the print quality is not proper, or an ink cartridge contacts the paper, adjust the head-to-paper distance in the
following procedures:
Procedures for adjusting the head-to-paper distance:
i) At the bottom edge of the boss beside the red screw on each side of the chassis, put a mark to indicate the current
position. (See the step 1 of the carriage rail adjustment above.)
ii) Loosen the red screws, and adjust the head-to-paper distance.
- To prevent the ink cartridges from contacting the paper: Raise the carriage rail from the current position.
- To improve the print quality: Lower the carriage rail from the current position.
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