Thank you all for the feedback. I haven't devoted any real time to work further on this project, but wanted to acknowledge?
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I didn't notice a thermal fuse bump on the transformer.? But it's on the bench in the office, and I may start to remove the insulation tape.?
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When the transformer was removed from the board, I did check the MOV.? It measured high resistance.? The MOV part number is 471KD10, e.g. 470V typical.? ?Min is 423V, and 423/sqrt(2) is 299V RMS max.? Of the cuff, this seems too high to be of any real benefit in a 120V mains AC application.? ?For added piece of mind, I will use an external surge protector.? (I did use one most of the time)? I have other unvetted speculation ideas too.? The hobby machine's electrics weren't designed with best known practices (>$).? ?
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Maybe my problem is indeed a one-off and not a common problem with the FC350BJ/110V Controller in the MiniLathe community.
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Regards,
Gary
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