A scan test apparatus having at least an upper layer of conductive and
compliant material and may include a lower layer of conductive and
compliant material sized to cover the upper and lower surfaces of the
printed circuit board to be tested. Electrical current is introduced into
the conductive layers which shorts out the circuits on the printed
circuit board. An electrical contactor is positioned on either side of
the conductive layers on both sides of the printed circuit board. The
printed circuit board is passed through the upper and lower conductive
layers and the contactors by rollers positioned on each end of the scan
test machine. The contactor sends a test signal from the circuit board to
measurement electronics. Other embodiments include the shorting matrix to
be movable and the printed circuit board being fixed and include
non-contact sensors or arrays of electrical contactors.