Epson SQ-2550 User Manual page 41

Connecting the Printer to Your Computer
2. Squeeze the wire clips together until they lock in place on
both sides of the connector. (If you do not lock these clips
into place, the printed results may be incorrect.1
3. If your cable has a ground wire, attach it to the ground
connector beneath the interface connector.
4. Plug the other end of the cable into the computer. If there is
a ground wire at the computer end of the cable, attach it to
the ground connector of the computer.
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Setting Up the Printer