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    Blown amp. What to look for?

    I got a PA BB1250.1 amp from a buddy who says it keep blowing the fuse under the hood.

    I hooked it up to a battery and it got hot real fast and I heard a slight buzzing/humming noise(not the fan,it works) coming from the amp, any ideas what parts to start checking?



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    Re: Blown amp. What to look for?

    Open it up and see if you notice anything burned. If the fuses are opening it means that something in the power supply section is shorted out or in the amplifier section.



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    Re: Blown amp. What to look for?

    Had it opened,no obvious burnt components.



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    Re: Blown amp. What to look for?

    Then you will have to test out what is bad with a volt meter.



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    Re: Blown amp. What to look for?

    zach,clear your pms.



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    Re: Blown amp. What to look for?

    There are little transitors right in front of the fets. Look real close at those. If it is one then it needs all the fets replaced



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    Re: Blown amp. What to look for?

    My pms are cleared i had less than 100 messages so I don't know why it wouldn't let you send a message.



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    Re: Blown amp. What to look for?

    check all legs of the "q" numbered transistors clamped to the heatsink. none should read near, or at 0 ohms. the ones labeled "d" are diodes, so you will get a reading from them.



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    Re: Blown amp. What to look for?

    Heard a buzzing noise? That's probably the toroid singing a bit when some current is passed thru it. That and the blowing fuses bit leads me to think there's a short on the power supply side of the amp.




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    Re: Blown amp. What to look for?

    After finally looking deeper i found the problem...



    gut shot..



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    Re: Blown amp. What to look for?

    easy fix?



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    Re: Blown amp. What to look for?

    all depends on what else i took out. i working on a rubi 1000d and i just rebuilt that whole card.




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