Epson PowerLite EB-L520U User Manual page 225

All the lights start flashing to indicate that the projector's settings are being updated. Disconnect the
USB cable. When all of the indicators stop flashing, the projector turns off.
Caution: Do not unplug the power cord while the lights are flashing. This could damage the
projector.
Note: If the projector does not turn off and the lights continue flashing, see the link below for a
solution.
Parent topic: Copying Menu Settings Between Projectors
Related references
Projector Light Status
225