Epson EXPRESSION 1640XL User Manual page 76

ADF-Single-sided, ADF-Double-sided:
Select one of these settings when using the optional
Automatic Document Feeder. If you are scanning single sided
documents, select ADF-Single-sided, and if you are scanning
double sided documents, select the ADF-Double-sided
setting.
Multi-page support with the Automatic Document Feeder
If you select Auto Document Feeder as the Document Source
and click the Scan button, the following dialog box appears.
If you select Single Page, only one page is fed from the
Automatic Document Feeder and scanned.
If you select All Pages (default), all the pages are fed from the
Automatic Document Feeder and are scanned. Depending on
your application, the All Pages option may not work correctly.
TPU for Neg. Film, TPU for Pos. Film:
Select one of these settings when using the Transparency Unit.
If you are scanning negative film, select TPU for Neg. Film,
and if you are scanning positive film (or slides), select the TPU
for Pos. Film setting.
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Using Your Scanner