Epson Stylus Pro 4000 Reference Manual page 253

11. If you have extended the paper tray and cover fully, pull the
paper tray cover extension to support the large size of
printout.
12. 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.
Now the printer is ready to print. While the printer is printing, do
not open the top cover. If the top cover is opened while printing,
the printer stops printing, and then restarts printing when the top
cover is closed. Stopping and restarting printing may reduce the
print quality.
button to select Sheet
Paper Handling
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