Fujitsu ScanSnap S300 Operator's Manual page 216

4. Rotate the pick roller bushing (left).
Pick roller
5. 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 scanner.
ATTENTION
196
Pick roller shaft
If the 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.
* Don't use water, mild detergent or air-spray.
Pick roller bushing
Pick roller shaft
Pick roller