Cities shall establish a civil service board that shall provide for and oversee the examination of applicants for appointment and promotion to any position in the police or fire department. Council shall appoint three city residents to the board who shall serve four-year terms or until their successors are appointed and qualified, except for the initial appointment of board members as provided for in section 14403 (relating to civil service board and quorum). Any individual who is a registered elector of the city may be appointed to the board. No city officer, official or employee shall be eligible for appointment to the civil service board.