Benq Projector W1200 Manuel D’Utilisation

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a function key labeled CRT/LCD or a function key with a monitor symbol on the notebook. 
Press FN and the labeled function key simultaneously. Refer to your notebook's 
documentation to find your notebook's key combination.
The output signal for MONITOR OUT jack only works when the input signal comes from 
COMPUTER jack. When the projector is powered on, the output signal from MONITOR OUT 
jack varies depending on the input signal from COMPUTER jack.
If you wish to use "Monitor Out" connection method when the projector is in standby 
mode, make sure the Monitor Out function is turned on in the SYSTEM SETUP menu. See