Epson Perfection V500 - Manual (Page 191)

Note:
If you are scanning a large or thick document, you can scan with the ADF
open. To scan documents or photos that are normal size and thickness,
always close the ADF.
Home Mode, Office Mode, and Professional Mode are available for
scanning your documents on the document table while the ADF is
installed.
If you are using Home Mode or Professional Mode to scan your
documents while the ADF is installed, see Selecting Basic Settings .
If you are using Office Mode to scan your documents on the document
table while the ADF is installed, make sure Office Mode is selected and
then click the Help button in the Epson Scan window for instructions.
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