Epson Pro 5000 Reference Manual page 54

Note:
The paper size and media type lever settings you make in the
paper tray can be overridden by the Paper Size and Media Type
settings you make in your printer driver or application. The main
purpose of this selection is to send a paper size or media type
mismatch message to the printer driver in case the media loaded
in the printer does not match the media you select in the software.
You can turn off the notification function by selecting Other as
the printer's paper size and media type settings.
Select Other for unlisted paper sizes or media types.
If ink smears on the paper, select Thick Paper as the media type
setting.
If you set the paper size or media type lever incorrectly, you may
not get the print results you expect.
The paper size and media type cards are provided to help you
identify the kind of paper you have loaded in the paper tray. Find
the paper size card that matches the size of paper you load and
insert it in the card slot above the paper size lever, on the left.
Find the media type card that matches the type of media you load
and insert it in the card slot above the media type lever, on the
right. You can store unused cards in the pocket behind the paper
size card slot.
2-14
Paper Handling