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

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PS36K power supply overload problem

I have a PS-36K Pyramid poewr supply. When I turn it on it goes to 15 volts and the protection light comes on and the unit beeps. I cannot adjust voltage. I need a schematic and would appreciate any suggestions you can give. THANKS!

Jim Goldring

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  • Anonymous Jan 28, 2008

    I have the same problem.When I hook anything up,even a small clearance light bulb,the voltage drops to zero and the protection light comes on.

  • Anonymous Sep 17, 2008

    Yes. I currently have a PS21KX which has a similar outcome. The volt indicator is +/- 15v, L.E.D flashes, and there is an audible alarm/beep. But the user manual points to a high current drive of 90% of max/limit output. Is the 723 still a factor? Thanks.



    JR-TTI

  • William Hamm Jan 13, 2009

    I have a PS 36 kk supply and the buzzer is on constantly and voltage is 15 volts and will not adjust. Whats wrong? Bill

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Most of Pyramid's supplies are based on the LM723 voltage regulator. The DATASHEET should tell you most of what you'll need to know to repair it. THIS is the schematic diagram.

If the output voltage drives the voltmeter to the end of the scale, it likely has one or more shorted power transistors.

Posted on Dec 21, 2007

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