A buddy at work gave me a SoundTech mixer/amp to take a look at because it stopped working. The fuse was good but no continuity to the power transformer. The power switch is intermittent but luckily its a DPDT switch and only one side is wired. But anyhow when I started looking over the main amplifier board I spotted this freaky looking cap. The insides just look exploded out 
A nearby wire has the insulation charred black from the heat!
Hopefully the blown cap and bad power switch are all thats wrong with this thing...
A nearby wire has the insulation charred black from the heat!
Hopefully the blown cap and bad power switch are all thats wrong with this thing...
Hi astouffer,
Cool, a capacitor wearing a "dunce hat".
I've seen many like this over the years. Your power switch is probably the fault, but some power supply components may have suffered from the high noise coming from the arcing power switch.
What really helps is an MOV placed across the transformer primary. Right across the leads. If it shorts, the fuse will blow. The MOV will clamp the voltage spikes occurring when you turn the unit off. This will greatly prolong the life of the switch contacts.
-Chris
Cool, a capacitor wearing a "dunce hat".
I've seen many like this over the years. Your power switch is probably the fault, but some power supply components may have suffered from the high noise coming from the arcing power switch.
What really helps is an MOV placed across the transformer primary. Right across the leads. If it shorts, the fuse will blow. The MOV will clamp the voltage spikes occurring when you turn the unit off. This will greatly prolong the life of the switch contacts.
-Chris
very interesting!
such kind of destroy I know primarily from electrolytic capacitors, e. g.
http://farm4.static.flickr.com/3309/3338684405_0f18f1e736.jpg
There are many counterfeits, not only by semiconductors.
to find more photos about destroy caps, please fill in the term (key word) "bad caps" by google and use the image search
such kind of destroy I know primarily from electrolytic capacitors, e. g.
http://farm4.static.flickr.com/3309/3338684405_0f18f1e736.jpg
There are many counterfeits, not only by semiconductors.
to find more photos about destroy caps, please fill in the term (key word) "bad caps" by google and use the image search
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