Try servicing the contactor as well. I had a few machines literally given to me because the contactor had started getting noisy. It would be an obnoxious buzzing & clattering sound. There's a little piece of rubber behind the coil & if it wears away, or the contacts don't seat well anymore, it will make that noise. After cleaning it out thoroughly, resurfacing the points (MODERATE belt sanding works fine) & putting some contact grease on the points, check the back side of that coil that faces the mounting plate. Apply some layers of clean black tape & trim with a razor blade. You want it to tightly seat in front of that plate it sits in. If the slide holding the upper contacts is broken, that will cause the vibration to occur too. I had an SCP 200 that got gradually louder over time. It was intermittent, but started getting worse. That was the problem. It could be something else, but if it's what I'm thinking, that may be it.
Like Dave said, check your connections inside & take a good look at the obvious before determining that it's junk. Not saying you're ingorant, I've overlooked MANY a simple problem in my great wisdom (haha) before sitting down & going thru the simple stuff first. If you do need a contactor, any 2-3 pole 90 amp 115 VAC coil contactor will work just fine. I think I even have one for it. Ebay is the best place to get one cheap. I've purchased new ones for under $30. That's a great machine & had little issues with a good track record over about the 3 decades that Miller built them.
If that's not the problem, I just blabbed a bunch of nothing. My wife says that's about all I do anyways.
You could always sell it to me for cheap too! (haha) Good luck with it! Steve.
failure of diodes can cause buzzing or just loose windings inthe xformer
Forum
