Question about Pyramid - PS21KX 20 Amp Power Supply Car Audio Amplifier
Powers up but has low voltage
Have you done any troubleshooting at this point?
Are you going to try to repair this yourself?
Have you tried to locate a schematic for the supply?
Posted on Mar 13, 2008
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In most of Rockford's amps, the low voltage detection is connected to the remote input. If the remote voltage is too low and they use the same circuit on this amp, it could trigger the protection circuit.
Disconnect the head unit's remote from the amp. Use a fuse holder with a 3 amp fuse to jump between the B+ connection and the remote terminal of the amp. If the amp powers up, the head unit's remote output may be defective. If it blows the fuse, the remote input or part of the power supply is damaged. Do not try it with an unfused jumper.
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