Optoma EP709 User Manual - Page 23

User Controls Management I Menu Location Choose the menu location on the display screen. Projection  Front-Desktop The factory default setting.  Rear-Desktop When you select this function, the projector reverses the image so you can project behind a translucent screen.  Front-Ceiling When you select this function, the projector turns the image upside down for ceiling-mounted projection.  Rear-Ceiling When you select this function, the projector reverses and turns the image upside down at same time. You can project from behind a translucent screen with ceiling mounted projection. Source Lock When this function is turned off, the projector will search for other signals if the current input signal is lost. When this function is turned on, it will search specified connection port. Keypad Lock When the keypad lock function is on, the control panel will be locked, but the projector can still be operated by the remote control. If canceling this function, use the remote control or press the "Enter" key on the control panel for 3 seconds to turn it off. 23 English