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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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The meter is not infinitely resistive -effectless, it has effect on the circuit, and may be enough to switch the scr on.
np-pn junctions in scr fail occasionally, the voltage fluctuation due to the meter may have been just enough to trick the rectifier, the scr may need to be replaced,
Has there been any major power suge, lightning strike 'close (in lightning terms) to the unit', output short, to the power supply, slilcon can really only be tested out of circuit its often easier to replace than test

Posted on Jul 01, 2008

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