NEC 40,000-Lumen 4K Laser Installation Projector - Manual (Page 43)

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2. Projecting an Image (Basic Operation)
Detecting the Signal Automatically
Press the SOURCE button for 1 second or longer. The projector will
search for the available input source and display it. The input source will
change as follows:
HDMI1 → HDMI2 → DisplayPort1 → DisplayPort2 → HDBaseT → SDI1
→ SDI2 → SDI3 → SDI4 → SLOT……
TIP: If no input signal is present, the input will be skipped.
• Press it briefly to display the [INPUT] screen.
Press the ▼ / ▲ buttons to match the target input terminal and then press
the ENTER button to switch the input. To delete the menu display in
the [INPUT] screen, press the MENU or EXIT button.