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