Epson Stylus Pro 4400 Reference Manual page 292

10. Extend the paper tray and paper tray cover according to the
paper size. If you do not extend them, the printout may fall.
Note:
Make sure the roll paper support is not raised.
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
is in progress, the printer stops printing, and then restarts printing
when the top cover is closed. Stopping and restarting printing
may reduce the print quality.
Caution:
c
Do not leave the paper in the printer for a long period of time; its
quality will deteriorate. We recommend that you remove the paper
from the printer after printing.
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Paper Handling