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Behringer EP2500 repair, clipping!

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nitrokart View Drop Down
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    Posted: 06 September 2017 at 5:41pm
Hi everyone,

I’m with a little of trouble repairing a Behringer EP2500...
The amplifier had experienced a voltage surge. It had bad power and driver transistors and a bad capacitor (completely shorted 12000uf!)
After first repair the amplifier turned on! However I’m having trouble!
If I power on the amplifier with no load, it powers fine, but if I try to power it on with a load attached it stays in protect until I turn the gain knob up (more than half...)
The other issue, when I started to pull power from the amplifier I realized it is clipping to soon!
I attached a screenshot of 1kHz sine wave, as you see it have a 100Hz “dip” on it!
What do you think? An open capacitor? Someting wrong on the signal or power path?
https://ibb.co/gKqAEF -
https://pt.imgbb.com/ - free image hosting

Thanks in advance,

Edited by nitrokart - 06 September 2017 at 5:45pm
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JR.junior View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote JR.junior Quote  Post ReplyReply Direct Link To This Post Posted: 06 September 2017 at 6:28pm
check the negaitve rail, it does not reach the full voltage swing.
Support the scoop technology, larger mouth plays louder!
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simonp1100 View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote simonp1100 Quote  Post ReplyReply Direct Link To This Post Posted: 06 September 2017 at 9:00pm
Also check the class H circuit (Switching FET'S & Diodes).

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kedwardsleisure View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 06 September 2017 at 10:17pm
could be the pcb through-holes. They can fail around the base of the 10,000uF capacitors leaving them out of circuit.
Kevin

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ceharden View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote ceharden Quote  Post ReplyReply Direct Link To This Post Posted: 06 September 2017 at 11:02pm
As per Kev's post.  Whether it's the caps or the PCB I'd say you've got a bit of PSU ripple going on there.
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nitrokart View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote nitrokart Quote  Post ReplyReply Direct Link To This Post Posted: 07 September 2017 at 3:09am
Hi,

Thanks all for your help!

It was indeed a PCB via... It wasn't connecting the top and bottom layers (on a 12000uf cap) , a quick jumper and it's back runnig fine!

kedwardsleisure, you find it at fisrt guess! you rock!
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