Using the Sony HXCU - D70 Camera Control Unit is easy. First, connect it to your HXC - D70 HD/SD camera using the appropriate cables. Then, plug in the correct power supply to get it up and running. When using, make sure the connections are secure to avoid any signal interruptions. As for maintenance, keep it in a dry and clean place. Avoid exposing it to extreme temperatures or humidity. If you notice any issues, check the power supply and connections first before seeking further help.