Canon DR-5020 Instructions Manual page 43

2.3 Various Scanning Modes
4
Click [Start Scanning].
2
The Start key in the center of the operation panel lights (green).
When the scanning mode is set to Auto, the sensor located on the document tray
shown in the figure below automatically detects the document to start scanning.
CAUTION
When something covers the sensor on the document tray after you have instructed
scanning in the application, the scanner erroneously judges that a document has
been loaded, and the document tray starts to move. Make sure that objects other
than the document do not cover the sensor on the document tray.
Sensor
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