Canon imageCLASS MF4690 Operation Manual page 67

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Neatly place the documents face up in the document feeder tray.
The document is ready for scanning.
– Do not add or remove documents while they are being scanned.
– When scanning is complete, remove the documents from the document delivery tray to avoid paper
jams.
– Avoid using ADF to scan the same document more than 30 times. When scanned repeatedly,
documents can become folded or torn, which may cause paper jams.
– If the feeder rollers are soiled from scanning a document written in pencil, clean them. (See "Cleaning
the Machine," on p. 10-2.)
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