Canon 3749B002 On-Screen Manual page 50

Insert the protrusions of the FAU Protective Sheet into the slots of the Document Cover, and press both
sides at top of the FAU Protective Sheet to fit it in.
Important
Once the photo printing from the film has been completed, be sure to store the removed Film
Guide behind the FAU Protective Sheet and reattach the FAU Protective Sheet to the Document
Cover. The FAU Protective Sheet should remain attached when copying or scanning originals
other than films, such as documents or photos.
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