L-6534VW Operation Guide Overview of the Product Corona treater control panel Operate when using a corona treater. Depending on the date of manufacture of the press, there are two types available; a push-button switch type and a touch-panel type. Push-button switch type Touch-panel type 30 Letter Name Explanation a OFF switch T urns off the corona generator. b ON switch T urns on the corona generator. c DOWN switch L owers the corona output. d UP switch R aises the corona output. e OPEN UP switch N ot used in this version. f BELL switch S tops the alarm. g Display D isplays the output and so on for the corona. Letter Name Explanation a OFF button T urns off the corona generator.