A circuit and method are presented to accurately determine a BEMF voltage of a VCM coil after termination of a driving current in a first current direction in the coil. The powertrain, more specifically a transmission, includes an input shaft that is coupled to a rotational power source and an output shaft that is coupled to a load. In an unprocessed region except the processed region, a gap between an inner surface of the cover member and the surface of the substrate has a size such that temperature distribution is not caused in the coating film formed on the surface of the substrate under the influence of heat transfer from the cover member. A polishing device is movably coupled to the second elongate guide device. Generating unit generates a new reproduction procedure by editing the specified part, generating new management information.