| 摘要 |
A double-column switching apparatus of a pin jack board is provided to insulate a signal ground of a printed circuit board from a frame ground of the pin jack board. A metal plate(12) is equipped with the outer circumference of a cylindrical terminal member and performs a frame ground function when connecting the home appliances with an external device. Combining protrusions are formed at both sides of a pin jack board so that a switching board(20) is detachably combined with the pin jack board. The switching board is combined between the pin jack board and a PCB(Printed Circuit Board). When a plug jack of an external device is inserted into the jack hole, the switching board mechanically turns off the input/output of a signal of the home appliances.
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