in the case of a tester that does not have a plug but rather a set of flexible cables the tester may be connected to the relevant contacts 125 i surrounding the test socket are four terminal arrays of plated through holes 120 1 through 120 4 each array is one quarter of the total number of pins in the test socket for this example that would be 420 in each plus one extra these holes would be internally wired to the contact positions in the test socket array these holes would also be connected to power plane 15 on the top surface of the board and ground plane 25 on the bottom surface every position in the test socket would be connected to power ground and a location for a jumper wire before the board is customized for a particular device located adjacent to the tester connections at the right side of the board is another array of holes 135 that are connected internally through wiring layers to the tester connections represented by plug 140 this array 135 is where the other end of the jumper wires from the arrays adjacent to the test socket are connected the method of fabricating a board 10 suitable for use with the invention comprises 1 assemble a set of printed circuit boards with conductive sheet s bonded to at least one side 2 lay out a pattern on the top sheet for a contact array 100 terminal arrays 120 and optionally a tester array 135 and plug 140 4 pattern intermediate layers to connect each member of the contact array to a corresponding member of a terminal array for a failing device type.