Epson ELPDC20 Document Camera User Manual page 66

Problems and Solutions
66
the software, being sure to allow the Button Manager and TWAIN Driver
for Epson Document camera to install.
You don't see the live camera image on your computer
The document camera's USB Mode setting may be set to Mass Storage.
You need to change this setting to Application. First disconnect the USB
cable, then reconnect to the projector using a VGA cable, composite video
cable, or HDMI cable. Press the [Menu] button and select Function > USB
Mode, then change the setting to Application. Now you can use the USB
cable to display the image.