Canon DR-5020 Instructions Manual page 52

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The document tray automatically rises, and scanning begins. When
scanning of all pages in the document ends, the paper tray is
lowered.
Scanning does not start when the document is loaded first. In this case,
either press the Start key, or remove and load the document again.
If paper feed stops during scanning due to a system error or paper jam, make sure
that the last page of the original that was being fed in was recorded properly before
MEMO
continuing scanning.
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If there are more pages in the document to scan, load the
document, and scanning begins automatically. To end scanning,
press the Stop key.
3.2 Document Feeding and scanning
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