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Old 11-17-2021, 06:33 PM   #29
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Join Date: Jun 2012
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Default Re: Motor control board repair

That proves the bridge rectifier and the rest of the -15v circuit is ok. The fault is then with either the transformer not supplying the a/c to the bridge or there is a break (or small fuse) between the transformer and the bridge rectifier.

I hope the transformer was NOT connected when you applied the 20 volts to the bridge? if it was that may have opened the winding on the transformer as the winding would be a very low resistance to the 20vdc.

Last edited by R_J; 11-17-2021 at 06:48 PM..
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