Canon MF8580Cdw User Manual page 70

4
Align the document guides against the edges of the document.
Slide the document guides inward until they are aligned securely against the edges of the document.
The machine is ready to scan the document.
IMPORTANT:
Align the document guides securely against the edges of the document
Document guides that are too loose or too tight can cause misfeeds or paper jam.
While documents are being scanned
Do not add or remove documents.
When scanning is complete
Remove the scanned documents from beneath the feeder to prevent paper jams.