FUJITSU fi-4750L - Manual (Page 21)

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Temporary error
<Hopper empty>
This message is displayed if there is no more paper on the ADF
paper chute during a read operation in ADF mode. Fill the ADF
paper chute with paper. To enable the read operation, press the
stop button.
<Jam>
This message is displayed if a document is jammed in the ADF.
See the “Cleaning and Maintenance” manual. (“Cleaning paper
jams” “Symptom 11” “Symptom 12”)
<ADF cover open>
This message is displayed if the ADF is not closed completely.
Close the ADF completely, and enable the read operation.
<Double feed error>
This message is displayed when the ADF detects the Double feed
error. Check the document and re-scan the document.