Epson ELP-3000 - Manual (Page 25)

Connecting to a PC laptop computer
Before beginning, turn off the projector and computer if they are on. To access
the connectors on the projector, push open the cover located on the right side of
the projector, under the handle.
1.
2 .
3.
Connect the LCD connector on the Y-cable to the projector’s Computer
IN/OUT port.
Connect the VGA connector on the Y-cable to the laptop’s monitor port.
Tighten the screws for all connectors to make sure they are fastened securely.
When the external graphics port is activated, some laptop computers
automatically turn off their internal display See your computer manual for
information on using the internal display,
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Installation