Embodiments related to identifying a reference scan cell locationally related to a fault condition exhibited by a scan chain in which the reference scan cell is included are provided. Another aspect of the invention is to predict the feed roller shutoff point according to the rate of engine deceleration. In addition, when replacement sub-assemblies are used, for example, for maintenance or upgrade, then it is necessary to authenticate those sub-assemblies. The piezoelectric element 30 is vibrated using a processed sound signal in which at least a part of frequency components of a sound reproduction signal that are higher than a predetermined threshold value is cut or attenuated.