I have a 24 volt power supply for a piece of industrial machinery that isn't working. I opened it up, applied 120 vac, and began probing different components with my voltmeter. I came to a 100 ohm 1 watt resistor that appears to be connected to an SCR, and put my meter probe on it. The power supply made a funny noise and began working! I can repeat this everytime I power down and back up, and it works even if the probe is unplugged from the meter. probing the resistor with, say a piece of wood will not work. I have replaced the resistor and there is not a bad connection. Any ideas?
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