Canon 0080B002 User Manual page 25

2.
Set the document guide adapters onto the document guides.
Note
Cover the document guides from above with the document guide adapters, and
insert them as far as they will go, until they click into place.
3.
Carefully close the upper unit.
IMPORTANT
Do not force the upper unit to close. Doing so can damage the scanner.
4.
Be sure that the upper unit is completely closed by pushing on both edges with
both hands until you hear a click.
Document Guide Adapter
Document Guide
Using the Scanner
21