In an electronic component mounting apparatus capable of replacing a component placing device with any of plural other component placing devices different in performance, the distance between the center line of a component pick-up portion of a replaced component placing device and the optical axis of a board recognizing camera is calibrated easily and precisely. The mobile station determines a difference between the transmission phase of a frame synchronizing signal received from a first base station currently holding a communication channel with the mobile station and the transmission phase of a frame synchronizing signal received from a second base station expected to newly set up a communication channel with the mobile station. The method may include receiving an operator input and determining a condition of the hydraulic circuit. Epitaxial silicon is grown on the exposed areas of substrate so that it is substantially as thick as the isolation structure, and these grown areas define the active areas of the substrate upon which electrical structures such as transistors can be formed. A coupling system may be used to secure the longitudinal housings to the tubular members. The processor is further configured to: select a bandpass filter from among the plurality of bandpass filters.