Try going directly from S output of camera first into converter box. Also make sure your camera menu settings are set up to output video from S out. If you have video in that configuration, test all cables with that set up first. Many S/VHS cables are of poor quality and break if you sneeze on em. Once you have the camera and converter working you can add the mixer when you are sure all of your cables are good and dip switches on the converter are set and working.