PURPOSE:To carry out the earthing to a metal fitting by inserting a metal fitting to install a power source transformer and a projection provided to the metal fitting to a hole provided at a printed base, and soldering by a pattern land or bending the projection to connect the earthing member of the printed base and the earthing member of the power source transformer. CONSTITUTION:From a metal fitting 8 to install a power source transformer 6, a cutting up member 8a is provided in L-shape to fit to a hole 7d at the position formed by the terminal hole 7b and a common circuit 7c of a printed base 7, a projection 8b is formed to the cutting up member 8a, and the projection 8b is inserted to the hole 7d. As a result, a lead line to connect electrically to an earth electrode when the earth electrode of the power source transformer 6 is earthed is not used but it can be connected to the metal fitting 8 directly. Consequently, a lead line which is used conventionally is not required, and the fastening together with a screw for fixing the lead line and the metal fitting for installing the power source transformer, or the fastening work with a screw for fixing the lead line provided at the other position from the metal fitting are not necessary to carry out.
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