A charge against Helionetics was dismissed.

U.S. District Judge William D. Keller said that a racketeering charge, included in a suit filed last fall by a former chairman and a former consultant to the Santa Ana company, had no merit. He also threw out charges of securities fraud made by former consultant Marvin Stern but said similar charges by former Chairman Wendell B. Sell could be refiled. The y-month-old suit against the high-technology company and its largest shareholder, Bernard B. Katz, stems from a pending suit filed by Stern in state court in 1983 over the right to sell his stock in the company.