Transformer sizzling, who can rebuild?

DRecovery

DRecovery

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I have a STR-6120 I am repairing that has quite a sizzle when you first turn it on. No smoke, no smell, and no ozone. But it's enough that it kills a lot of the FM stations below a certain signal threshold and it completely kills my ethernet-over-powerline thing I have in the garage. I can see it just by putting my scope probe to the chassis so it's getting everywhere.

It has to a winding arcing through the paper in the transformer. Does anyone know of some place that might rebuild this transformer for me?
 
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Hmmmm... No. It sounds like it's coming from the transformer, but... I'll jumper the switch and try it.
 
Well in chasing the red herring, I snapped this picture of the transformer. It's laminated and it's round. Is it a toroid?
 

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This is a toroid or toroidal transformer.
toroidal-transformer-00027(1).jpg
 
petehall347 said:
where was that switch mounted ? is it for mains on/off ?
i am concerned with the very low rating of it .. unit draws 320 watts maximum so at 120v unit draws about 2.7 amps . i would be putting at least a 5 amp switch in there .
i am also a bit confused as power switch looks like a toggle type in the manual .
Click to expand...

It is the mains switch. It's bolted to the toggle mechanism and there is an arm on the toggle that actuates it. There is also another section that looks like a conventional rotary switch attached to the toggle with much smaller wires that must handle some kind of auxiliary power switching.

It says it's rated for 12A on AC or 1/2A-1/4A on DC. The replacement I got is rated for 15A AC... Obviously the switch failed so that may be an indication of the rating. However, it is also missing the large ceramic capacitor I am used to seeing on a power switch. I wonder if I should add one?

The datasheet for the replacement breaks down the current rating into various types of loads. It's rated for 15A into a resistive load, just 2A into a "lamp load," 10A into an inductive load, and 3A into a "motor load." I'd expect the transformer to be somewhere between a motor load and an inductor load, I guess. Of course, it also has two auxiliary switched outlets in the back that say they are rated at 300W total in combination with the single unswitched outlet. That sounds more like a wire rating than a switch rating though...
 
damn i wish whatever i was typing stayed right there and not get instantly posted .
i had answered my own questions before i even hit the post button .so what you replied to shouldn't have even been there .
maybe i can change a setting to stop it happening . i will look now .
 
What do you think about putting a capacitor across the switch? Maybe help improve the life.
 
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Good DPDT toggle switches are the gold standard in my book. Lotta mfgs who penny pinch won't use them. The raison d'etre is the solidity & intergrity of the connection.
 
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