Overview:
Your document camera allows you to project to your room projector/touchscreen classroom papers or items on your physical desk.
It’s basically a camera that points down and connects to your room projector/touchscreen TV via a HDMI cable.
If it is turned on and not working the first thing to double check is if there a cable securely plugged into the projector and is that cable also securely plugged into the wall. 90% of the issues are a bad or disconnected HDMI cable. Give it a wiggle on both sides to start with.