A method or apparatus of identifying for repair a signal leak in an HFC network, wherein a base transceiver station in the vicinity of the HFC network transmits a BTS signal over-the-air. The plurality of operating modes include: a first auto stop mode where a motor rotates only for a first time period after an impacting operation is detected; and a second auto stop mode where the motor rotates only for a second time period which is shorter than the first time period after the impacting operation is detected. The protectedenhanced space is created by surrounding the protected space with ligands which absorb andor bind to one or more soluble inhibitors.