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No Sound From Power Amp

I have a Carlsbro Powerline Series 300W power amp which powers up, but produces no sound except when I turn the volumes up full, and then only for brief moments.

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  • neildono Nov 04, 2008

    Thanks. The amp was working fine the week before. I was using in in a DJ setup at about half volume. I'm wondering if something has popped?

  • neildono Nov 04, 2008

    I don't think it's the volume pots as it was working before OK.

  • neildono Nov 06, 2008

    Anybody had experience of this problem?

  • neildono Nov 06, 2008

    Thanks Robotek, it's being driven by a mixing desk which I know is OK, as I've routed it to a different amp and it's fine.

    The shorted speaker/ lead/ plug might be a cause. The whole setup was moved before it went wrong.

    Could a single speaker short make the whole thing go wrong?

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6 Answers

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  • Contributor
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A fuse may have blown or you might have a short that is preventing it from coming on at low volumes. You will need to get it checked by a professional to get it fixed.

Posted on Nov 06, 2008

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  • Master
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That means that the pre am is gone, get schematics and test the board.

Posted on Nov 04, 2008

  • Ginko
    Ginko Nov 06, 2008

    Not only a single speaker short can make the whole thing go wrong, with a little back luck a shorted speaker acn burn a amp final.

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  • Master
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As you said you have to increase the volume to get the sound so we can be sure that the cables on the back is connected properly.

The solution is replacement of all four output transistors. The ones mounted on the heatsinks. They must be replaced with ones that are the same case size and pin configuration and a higher voltage and current rating than the originals would help it survive the future.
This means that you need to get the ampplifier repaired by some technician.

Thanks

Posted on Nov 04, 2008

  • Indrajit Roy
    Indrajit Roy Nov 04, 2008

    Check the back of the amplifier which connects the cable for the speaker and see if its set properly



    Thnaks

  • Indrajit Roy
    Indrajit Roy Nov 04, 2008



    As posted by sweet_rascal, it is not require to unplug the speaker because amplifier doesnt have any inbuilt speaker.

    Thanks

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  • Master
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Have you checked the speakers with other amplifiers?
if not please check

Posted on Nov 04, 2008

  • dewan nafees ahmed Nov 04, 2008

    cool invention by Bappa170873 that amplifier has no inbuilt speakers. shows clearly the lack of proper English understanding.

    i have said you to check the speakers by using them with other amplifiers which are working fine. use them from your friends. so that you can sort out the problem.
    if it is with the amplifiers let me know i shall guide you what can we do next. if it is with the speakers then there is nothing we can do much about that.

    but what i doubt is the switch which you use to increase the sound. that must be the real culprit in this case if amplifiers are found guilty.


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  • Master
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Hi,

If your model uses the twin rotary volume control, then it would possibly be the wiper arm of these controls are not touching the carbon. In effect these are variable resistors. A quick temporary workaround is to open the unit and spray the inside of the volume controls with electronic contact cleaner. However, as stated a temporary workaround. Of course the correct procedure would be to replace them.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information. Good luck and kind regards. Thank you for using FixYa.

Posted on Nov 04, 2008

  • Louie  Role
    Louie Role Nov 08, 2008

    Hi again,



    Any development(s) so far?

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  • Master
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Hi, a couple of questions,

  1. do you have any indicator lights coming up.
  2. are levels and audio quality normal when the amp does come up?
  3. what are you driving the amp with and is it ok?
Get back with a comment and we shall see if we can get to the bottom of the problem for you.

regards
robotek

Posted on Nov 04, 2008

  • 2 more comments 
  • Graeme Ross
    Graeme Ross Nov 04, 2008

    If you hear a click coming from the internals of the amp, associated with the amp cutting off this is the protection circuit operating. It may well have an indicator on the front panel showing that protection mode is deployed. This indicates that there is a fault in the amp, or one(both) the speakers or cabling to them. How things actually sound will help to diagnose past this

  • Graeme Ross
    Graeme Ross Nov 04, 2008

    In normal operation, the best way to run the rig is to have the level controls on the front of the amp power turned all the way up, you then have an accurate metering of the levels you are working with on the mixer console from the master VU meters, then of course using the master level to control the desired volume.



    If you have a multimeter, a way of checking to see if you have a shorted speaker/lead/plug is to check each of them from the speaker leads at the back of the amp with an ohms meter. You should not measure less than the rated impedance of the speaker that it is attached to.



    You can also do a check by going about a listen to each box(your ear up close to the drivers so no mistake is made about what is working and not) and determine that all speaker drivers are working correctly.... High Frequency and low frequency. All it takes sometimes is a 1 faulty driver and the amp may shut down.



    Can you do these checks and report back.

  • Graeme Ross
    Graeme Ross Nov 06, 2008

    Yes, a shorted speaker wire may well be causing the problem. If not sorted out could also damage the amp. Some amps have one relay that will shut down both channels when a fault condition is present. If things have been moved, it is worth going over the length of the cables looking for damage, or inside any connectors used to be sure there are no short circuits or stray strands of wire shorting out. Check at the back of each speaker also. Check also that the amp has not had any settings on the rear bumped out of position, specifically bridge/stereo mode. You could use a multi meter to check for short circuits also.



    USE VERY LOW LEVELS TO TEST SUSPECT SPEAKERS WITH AN AMPLIFIER.



    You run the risk of damaging the amplifier in doing so at higher levels. Important to remember that shutting down/low audio levels means there is a fault somewhere.



  • Graeme Ross
    Graeme Ross Nov 06, 2008

    so do I get the ACCEPT :) Happy to advise you further.

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