Epson Perfection V500 - Manual (Page 188)

Slide the edge guide on the input tray of the ADF all the way to the right.
Place your stack of paper in the input tray with the printed side facing up and the top
edge facing into the feeder. Slide the paper into the feeder until it meets resistance.
Then slide the edge guide over to the edge of the paper.
Note:
If you loaded mixed-size sheets, make sure the top edge of all the sheets are
aligned so they feed into the ADF correctly.
To scan your documents using the ADF, see Scanning Using the Automatic Document Feeder .
Document Specifications