Canon PIXMA MP170 Service Manual page 22

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.
(3) Document pressure sheet adjustment
Perform the following adjustments when attaching the document pressure sheet:
1) Remove the cover sheet from the double-sided adhesive tape in the 4 corners of the document pressure sheet,
and fit the document pressure sheet in the 4 corners of the platen glass with the adhesive tape side facing up.
2) Close the document pressure plate ass'y to fix the sheet to the ass'y.
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