An apparatus for generating a Carrier-Suppressed Return-to-Zero signal is disclosed. A movable jaw pivots on a base around a vertical axis against the action of an elastic return means. When the selected test value is reached, it is held constant, and a condition in a HSU of the transmission is monitored for a change indicative of engagement of the park brake. A top layer of adhesive adheres to the hard top shell. The driving method includes applying a voltage on the data lines for trapping impurities crossing the data lines and lowering the degree of the image sticking effect, and applying different asymmetric waveforms to different data lines for trapping impurities crossing the data lines and lowering the degree of the image sticking effect.