Finding faults in circuit boards

Details Finding faults in circuit boards Finding faults in circuit boards

G - Physics

01

R

356/117, 356/2

G01R 31/28 (2006.01) G01R 31/30 (2006.01) G01R 31/3185 (2006.01)

Patent

CA 1303236

Abstract of the Invention The subject invention features diagnostic circuitry installed on one or more chips of a board. This diagnostic circuitry is constructed so that during a diagnostic interval it generates a diagnostic output signal if and only if it is supplied with normal voltages on service supply structures (such as ground, B+ supply, clock) distributing service voltages to devices on the board. The diagnostic output is connected to a diagnostic output pin of the chip which may also serve as one of the operating pins of the chip (such as a signal input pin). The receptacle for the diagnostic pin is connected on the board to a diagnostic interface at the periphery of the board.

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