BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of confirming a mounting position of a printed circuit board of an all-electronic exchanger suitable for randomly mounting a plurality of matching boards. Since the location of the matching board is not known, it is inconvenient to mount a plurality of matching boards at a predetermined position. However, in the present invention, even when a plurality of matching boards are randomly mounted, the position of each matching board can be confirmed. Since the mounting of the matching board becomes very easy, the above-described drawbacks can be improved.
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