FUJITSU fi-4640S - Manual (Page 18)

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DESCRIPTION
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 Chapter 4 for removing jammed ducuments.
<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 a Double feed
error. Check the document and re-scan it.