Ricoh PJ WU6181N 6200-Lumen WUXGA LCD Projector (No Lens) - Manual (Page 134)

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5. Using On-Screen Menu
Turning On or Off Remote Sensor [REMOTE SENSOR]
This option determines which remote sensor on the projector is enabled in wireless mode.
The options are: FRONT/BACK, FRONT, BACK.
TIP:
• If the remote control system does not function when direct sunlight or strong illumination strikes the remote control sensor of the projector, change another option.
Enabling Key Sound and Error Sound [BEEP]
This feature turns on or off the button sound or alarm when an error occurs or the following operations are performed.
• Displaying the main menu
• Switching sources
• Resetting data by using [RESET]
• Pressing POWER ON or STANDBY button