Epson TM-U375 User Manual page 15

Your printer comes with inch-type hexagonal lock screws
installed. If you plan to use an interface cable that requires
millimeter-type lock screws, replace the inch-type screws with
the enclosed millimeter-type screws by using a hex screwdriver
(5 mm). To distinguish the two types of screws, see the figure
below.
3. Plug the other end of the cable into the computer.
TM-U375P
You need an appropriate parallel interface cable to connect your computer
to the printer.
1. Make sure that the printer and the computer are turned off.
Then plug the cable into the connector on the printer, as shown.
Notch (one or more lines)
Inch-type
Millimeter-type
Setting Up the Printer 1-5