Blown plastic film capacitor

[miscro922]

Do these just blow and shut down a unit or does something else go bad causing these to blow? The receiver is a b&k Avr 307

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[Hyperion]

Yes, either is possible.

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[gadget73]

You'd need to provide more specifics. Where is this capacitor used, and exactly what kind of cap is it?

 

[miscro922]

You'd need to provide more specifics. Where is this capacitor used, and exactly what kind of cap is it?

Its on one of the power boards. I will add a pic. Its only got one number on it. 2a124k.sorry for the awful pic. Tablets can stinks

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[miscro922]

Yes, either is possible.

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Lol

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[miscro922]

Its the green one in the close right corner. Defiantly fried you can kinda see the soot in the pic. I'll get better ones later

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[toxcrusadr]

The entire picture is green, except for the part that is as white as the sun.

 

[petehall347]

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nearly fell off my chair laughing ..
Sent from an old duffer

 

[vincei]

I had a film cap short in a Parasound power amp, which caused a no bias condition. Of course that cap was the last thing I checked. :sigh:

 

[jaymanaa]

The entire picture is green, except for the part that is as white as the sun.

Needs more lighting, maybe an extra flash and some tin foil, Jack would know.

 

[petehall347]

all depends where the cap is in the circuit if it was just that shorting so as to cause a shutdown .. schematics and cap placement and much head scratching may tell .
replacing cap and powering up safely with a dim bulb tester or variac if that's ok with this amp is the other way to find out .
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[iloveamps]

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I like that so much I'd love to put it in my signature. Is that okay with you? I'll put your name on it.

 

[miscro922]

Better pics.

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[toxcrusadr]

Well, she's cooked all right! +1 on what petehall said above. And check other components connected to it while you're in there to make sure a nearby resistor etc. isn't blown too.

 

[miscro922]

Well, she's cooked all right! +1 on what petehall said above. And check other components connected to it while you're in there to make sure a nearby resistor etc. isn't blown too.

OK. Thanks guys. Anyone know a good place for an avr307 schematic?

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[toxcrusadr]

You might try contacting B&K. They do have a website.

 

[petehall347]

i have a p.a amp that uses them same mosfets . i have had it blow up 3 times and its never taken a single cap when the mosfets blew to pieces ..what i am getting at i don't think its an output problem . more like the cap broke down and self destructed . either that or a high voltage spike hit it .
i would like to see if it did any damage to the underside of the board and if it is wired in parallel to a high voltage . i am guessing the rails are around plus and minus 70 volts .

 

[Ths364]

When replacing it you might bend the new one away from that heat-sinked device right next to it. I'd replace that same cap in the other channel too.

 

[miscro922]

When replacing it you might bend the new one away from that heat-sinked device right next to it. I'd replace that same cap in the other channel too.

Hmm. Replaced it today and still have all the same errors. Only the one. I can't get bkcsuiteto connect to the blasted thing either. The factory reset from the front buttons won't work. Heck I don't even know if the buttons themselves work

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[miscro922]

You might try contacting B&K. They do have a website.

Tried all day and it was down.

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