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 Post subject: BEHRINGER EUROLIVE B1200D-PRO sub woofer
PostPosted: Thu Feb 16, 2017 5:54 pm 
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Joined: Fri Feb 08, 2002 1:01 am
Posts: 4163
Location: USA / North Carolina / Fayetteville
this powered speaker i am working on must be built like a tank.. i cannot find any info of it having any problems on the net.
but this one i am working on for a customer is being annoying.
it is a class D amp.. the audio IC is actually tiny..but boast 200W continuous.
anyway the problem i am having is with the SMPS. it is not reliably starting up.. and i am not sure what to look for.
i am sure its something in the start up circuit,, if you plug it in, it will power up for a micro second then go to a very dim pulsing led., but if i use my variac and have it around 100 volts then turn it up to 120v, it will work just fine. but anything above 120 and it shows it's ass ... anyone ever delt with a SMPS doing stuff like this ? what could it be.. ?
right now i am at a loss.. i guess next step is to call the tech support line..


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 Post subject: Re: BEHRINGER EUROLIVE B1200D-PRO sub woofer
PostPosted: Thu Feb 16, 2017 9:10 pm 
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Joined: Sat Aug 12, 2006 4:17 pm
Posts: 1216
Hmmm.............

Sounds like a bad AC Filter Capacitor on the Hot side of the supply.

I had a AT-Power Supply that was like that.
Only it would pop the fuse.

If I slowly brought the AC voltage up, instead of just putting the 120Vac to it,
the AT-Power Supply worked just fine.

Funny thing, the Capacitor read fine on the DMM.
But when I connected it to a Z-Meter for a more through test, it failed it.

Also, I'd check the other Capacitors, like a 10uF or .47uf in the oscillator circuit.


Signed: Janitor Tzap


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 Post subject: Re: BEHRINGER EUROLIVE B1200D-PRO sub woofer
PostPosted: Fri Feb 17, 2017 8:00 am 
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Joined: Fri Feb 08, 2002 1:01 am
Posts: 4163
Location: USA / North Carolina / Fayetteville
I need a schematic 1st.. if i can find one


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 Post subject: Re: BEHRINGER EUROLIVE B1200D-PRO sub woofer
PostPosted: Tue Feb 21, 2017 3:12 pm 
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Joined: Sun Mar 02, 2003 1:01 am
Posts: 255
Location: Austin Texas
Don't know if this helps...

https://www.ifixit.com/Device/Behringer_Eurolive_B212D

:)

Vern



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Vern Graner
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Nuts & Volts Magazine | SERVO Magazine
vern@nutsvolts.com |Skype: vern.graner
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 Post subject: Re: BEHRINGER EUROLIVE B1200D-PRO sub woofer
PostPosted: Wed Feb 22, 2017 4:57 am 
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Joined: Fri Feb 08, 2002 1:01 am
Posts: 4163
Location: USA / North Carolina / Fayetteville
thanks, but it is nothing close to what i have... i'll call the maker sometime soon as i find time.. maybe they've got tech support.


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