A housing immobilizing mechanism has a drive source that drives at a predetermined speed; a housing for holding the drive source; a number of fasteners greater than a number of predetermined fastening sites on the housing; and an immobilizing member attached to a plurality of the fasteners, the immobilizing member adapted to immobilize the housing. 1 to 10 parts by weight of a compound containing at least one group selected from epoxy group, amino group and isocyanate group, wherein the non-crystalline resin forms an island phase and the number-average dispersed particle size of the noncrystalline resin is 1,000 nm or less. Also, the main controller can check the receipt of the broadcasting signal from the transmission route by the broadcasting signal receiver and automatically specify from the result of the checking the channel of the broadcasting signal received from the transmission route.