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Finally got a stubborn LRU to talk after switching diagnostic methods
Had a line replaceable unit on a regional jet that kept failing its built-in test. For two days, I was just running the standard BITE and checking the fault codes it gave me. Yesterday, I pulled out the old signal generator and started feeding known-good waveforms directly into the input pins. Found the issue in about an hour: a tiny bit of corrosion on a connector pin that the internal test couldn't isolate. The direct signal injection made all the difference. Anyone have a favorite method for chasing down intermittent faults like that?
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