To use this Clear - Com RCS - 2000 Source Assignment Control Panel with RCU - 60 Unit, first make sure the controller is properly connected. Before starting operation, check the front panel for any tape residue and be aware that some Phoenix connectors are missing. When using, handle it gently to avoid further damage. For maintenance, keep it in a dry and clean place. If you find any new issues or problems during use, contact the customer service for help.