Fujitsu ScanSnap S500M Operator's Manual page 109

6.3 Cleaning the Inside of the Scanner
3. Close the ADF.
Paper chute
ADF
⇒
You should hear the ADF click when it returns to its original position.
When closing the ADF, make sure that it is completely closed. Otherwise,
ATTENTION
paper jams or other feeding errors may occur.
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ScanSnap S500M Operator's Guide