Fujitsu ScanSnap S510M Operator's Manual page 244

6. Remove the pick roller with its shaft.
Slightly pull up the left part of the pick roller shaft (about 5mm), move it towards the left
side, and then raise it to remove from the ScanSnap.
ATTENTION
222
Pick roller shaft
Pick roller
If the area around the pick roller is dirty by paper-powder, it may cause a
scanning error. Remove the dirt using a dry cloth moistened with
Cleaner F1.
* Do not use water, mild detergent or air-spray.