METHOD OF ELIMINATING SHORT CIRCUITS IN ELECTRICAL CIRCUITRY

摘要

Method and apparatus is disclosed for eliminating short circuits on electrical circuitry, the circuitry being interconnected by a thru hole (12) on a substantially planar electrical board (10). The electrical board has two major surfaces, upper and lower. A first gas and liquid transmission device (30-53) is connected to the board to introduce etching gas and liquid into the thru hole. The device comprises a part that is adapted to surround the thru hole and seal the periphery thereof on one surface of the board. A second gas and liquid transmission device (58-82, 92-104) is connected to the board to remove the etching gas and liquid from the thru hole. This second device comprises a part (58) that is adapted to surround the thru hole and seal the periphery thereof on the other surface of the board. A vacuum system (104) is used to force gas and liquid to move through the thru hole from the first transmission device to the second transmission device, thereby etching and/or cleaning material from the thru hole.
In another embodiment of the present invention there are provided transmission devices comprising a plurality of parts (53, 58) that are adapted to surround a plurality of thru holes and seal the peripheries thereof on both surfaces of the board.