Question about Crown CE2000 2-Channel Amplifier

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Crown Amp Possibly Blown??

I simply turned on a Crown CE2000 and it let a little bang and output some smoke. The fault lights remain lit all the time. I checked both speakon leads for shorts, it wasn't the cause. Are components easy to get for such an amp? What would be most likely to have gone? (transformer, voltage amp...) is it worth fixing?

Thanks in advance
Noel
Mech Eng & botch job DJ

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  • NoelMc Apr 08, 2008

    Thanks Graeme,



    I had a look at the circuit, it appears the relay on one of the channels blew up, i.e. there's a nice big hole in the side of it and there's a few burnt components around it. I'm presuming this might have been caused either by a faulty relay or short in the speaker wire? I'm going to replace the damaged components, put it back together and put it out into the middle of the lawn, switch on the extension lead and hope it doesn't blow up!

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Hi, probably worth fixing, Crown gear is generally reliable, but this one has failed for some reason. Puffs of smoke are not generally good... If it has blown an output array, expect a costly repair.

regards
Graeme

Posted on Apr 04, 2008

  • Graeme Ross
    Graeme Ross Apr 08, 2008

    Aahhh.... not sure what sort of relay could end up with a hole in it, is probably the output stages you are looking at. Do they mount to a heatsink??

    If it has an array of outputs, then expect there to be more than one part blown. All output transistors and driver transistors need to be checked. By design, the amp uses direct coupling, and a cascade effect of failed components is often found. Don't just replace the parts that are physically damaged...to fire it up again without soft starting the amp will result in the parts you just replaced and possibly more blowing again. Softstarting is where you use a variac to lower the voltage/power available to the output stage to prevent it from blowing if there is still a faulty part that was NOT replaced. Transistors may often appear to be ok, but have catastrophically short circuit junctions or leakage between junctions. The best bet when you have failed output components for a reliable repair is to replace the entire array and drivers also. All parts in the output stage have been under huge stress with the sort of failure you have had, and can sometimes be stress damaged, to then blow in the future, putting you back to square one. If you have any further questions about it, ask away. I have repaired this type of unit for a living. It is hard however to relay my experience with fault finding high power equipment to you from here. If the amp does not mean much to you, then I wouldnt even bother with it. If it does, then take it to a repair guy that does this type of unit and get a quote. Could work out better for you in the long run:)

    regards
    Graeme

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