| 摘要 |
A method and apparatus for producing self-diagnostic information from a circuit board. A circuit board is provided with an on-board processor, an on-board ROM containing diagnostic test software, a frequency generator adapted to produce an electrical signal having a predetermined frequency when an unacceptable response is determined, wherein the predetermined frequency corresponds substantially to the event within the diagnostic test sequence of a particular test for which an unacceptable response is determined. The signal is presented at an output terminal of the circuit board. The status of the circuit board is determined by measuring the frequency of the signal at the output terminal and comparing that frequency to an index of corresponding defects.
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