Fujitsu PA03541-B105 Operator's Manual page 210

10. Attach the sheet guide to the ScanSnap.
Hold the pick-up tabs on the sheet guide between the thumb and index finger, and then
attach the sheet guide to the ScanSnap.
⇒
The sheet guide makes a clicking sound when the knobs fix into position.
ATTENTION
11. Close the ADF.
⇒
You should hear the ADF click when it returns to its original position.
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Sheet guide
Make sure that the sheet guide is completely attached. Otherwise,
document jams or other feeding errors may occur.
ADF
Pick-up tab
Pick-up tab
Paper chute