Epson AcuLaser C4000 Owner's Manual page 48

Note:
Duplex printing is not available for transparencies.
Transparencies can be loaded into the MP tray only (up to a 10
mm thick stack). When using transparencies, you should make
paper settings as shown below:
Make settings on the Basic Settings menu (for Windows) or
the Basic Settings dialog box (for Macintosh) in the printer
driver as shown below.
Paper Size:
Paper Source:
Paper Type:
You can also make these settings on the Tray Menu in the
control panel.
MP Tray Size:
MP tray Type:
Please note the following when handling this media:
Hold each sheet by its edges, as oil from your fingers may
transfer to the surface and damage the printable surface of the
sheet. The EPSON logo appears on the printable side.
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Paper Handling
A4 or Letter
MP tray
Transparency
A4 or LT
Trnsprncy