Fujitsu PA03541-B105 Operator's Manual page 62

HINT
3. Adjust the side guides to the document width.
Move the side guides so that there is no gap between the document edge and side guide on
both sides.Doing so can eliminate skewing of the document during scanning. When moving
the side guides, hold the part with raised dots on each side.
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When scanning long-size documents, pull up the Paper chute guide and
open the extension in the order given.
Document
Paper chute
Side guide
Paper chute guide
Paper chute
Side guide