Epson 386/25 - Manual (Page 25)

4. Examine the connector end of the monitor cable, and
position the plug to match the orientation of the monitor
interface (marked with a monitor icon). Then insert the
plug into the port (the connector should fit in easily when
properly oriented), as shown below.
To avoid damaging the connector, take care not to bend
the pins when inserting the plug.
5. If the connector has retaining screws, tighten them by hand
or with a screwdriver, depending on the screw type.
Setting Up Your System 1-5