Question about Pyramid - PS21KX 20 Amp Power Supply Car Audio Amplifier

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Pyramid - PS21KX 20 Amp Powersupply overload

I got this from a friend and the transistors on the back were bad so I replaced them now when it powers up i get 12 volts then it dropsto 2.5 or so in a matter of 5 to 10 seconds and the overload light comes on what is causing this???I have a schematic but it says to refer to owners manual for the light but I dont have one.Please let me know ...Thank you

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  • Len Gauthier May 19, 2008

    I have a simular problem with low voltage on the PS-21 KX 12V 20A DC power supply. I think I might be able to troubleshoot the problem but I don't have a schematic diagram. Can someone e-mail a copy to me. Thanks
    Len VE2JG

  • Anonymous Jul 22, 2008

    I have a pyramid phase III 25 amp supply. When I use 15 watts or less my supply works o.k., but when I go to 50 watts the voltage drops from 14.8 to 9.2 volts. Also, 2 of the pass transistors do not heat up. I have no schematic, sure would appreciate a copy or a solution. Thanks, david

  • jpowell6012 Aug 26, 2008

    i am trying to run my kenwood radio (ham radio) on this supply but get no sound but when i hook it up in my car the radio works perfect

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Http://www.pyramidcaraudio.com/manuals/PS21KX.pdf

Posted on Feb 26, 2012

  • Brian Hutchins
    Brian Hutchins Feb 26, 2012

    here is the manual guys. it has schematic inside. enjoy.

  • Dean Dishman Feb 06, 2014

    thanks

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The problem I have had with a PS-20 is a blown capacitor. Hooked to a radio, would allow radio to receive fine, but when trying to transmit, amperage would bottom out. Behind the transformer is a large circuit board. UNPLUG POWER SUPPLY, remove cover, Undo the two nuts, flip board over, and gently rock the 4700uf capacitors side to side. If they move more than 1/16th of an inch, chances are they are blown. Remove/replace and should be good to go...

Posted on Mar 14, 2010

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Can someone send a copy of the Pyramid PS21-KX power supply (schematic diagram) so I can troubleshoot major problems. Thank you.

Len jocelyne.len@tlb.sympatico.ca

Posted on May 19, 2008

There are obviously more bad parts inside that need replacing.

Posted on May 09, 2008

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