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Speed Coil/switch Buzz  Rate Topic 
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 Posted: Fri Aug 10th, 2018 08:07 am
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Andrew Teague
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Now that i've revived my murdered my emmy for now.  New issue, but semi common I've read. 
It starts out quiet, and about 5-10 minutes It starts getting a very audible 60hz hum from the switch/coil. On another one I worked on with the issue, I noticed jiggling the switch affected the noise and just tightening the laminate screws worked perfectly.  This one, jiggling did nothing, but I attempted to tighten the screws on top of the laminates anyway. They wouldn't budge and I took a small chunk out of them trying to torque them... whoopsie!
I've read about and acquired sprayon clear electrical insulating varnish. The outside of the laminates and coil still look coated, solid and shiny. Obviously something has worked itself loose.

Are there any tips I should be aware of before I just start dousing this thing?  I assume to tape off the switch contacts. What should I aim for? How heavy of a coat? that sort of thing. I don't want to miss anything that could be obvious. I just want to make sure this shuts up for good, or at least tones it down.


Thank you!

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 Posted: Fri Aug 10th, 2018 02:00 pm
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Chris A. Campbell
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Which model fan are you working on?

I would not just douse it. There are contacts that do no need to be insulated.

Buzzing may be the plates, may be the wound wires in choke.

If your buzzing is in the speed choke there is a wooden piece that gives it a tight fit. I would first check that it is tight first

If tight and the plates you may try applying insulation to the laminate stack to see iff it soaks in. If not would need to remove plates, clean and reinsulate.

If you get to where you are having to reinsulate the plates might as well untape choke, spray wound magnetic wire, retape and then restack plates that are cleaned and reinsulated.

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 Posted: Fri Aug 10th, 2018 06:02 pm
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Andrew Teague
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Sorry, would help if I gave the model. Mid 50s 77648.

Last edited on Fri Aug 10th, 2018 06:03 pm by Andrew Teague

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 Posted: Sat Aug 11th, 2018 04:39 pm
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Andrew Teague
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I gave the outside of the laminates a quick coating and a heat lamp bake. No good.
The wood seems tight, but how would I be sure? And tighten if necessary? 
And is plate removal straight forward? I don't wish to start popping things apart and screw it up worse.

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