Epson Stylus Pro 4000 Reference Manual page 256

7. Adjust the paper guide and edge guide according to the paper
size.
8. Put the paper guide roller down, and attach the paper tray
cover back.
Note:
Make sure that roll paper support is not raised.
9. Press the Paper Source
Note:
Before printing on cut sheet media, check if the paper in the paper tray
is curled. If it is curled, uncurl it. Otherwise, a paper jam may occur.
256
Paper Handling
button to select Sheet .