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Why did my pyramid legacy 300x2 stop working

Why did my pyramid legacy 300x2 just suddenly stopped working and the protect light came on?

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  • Perry Babin May 11, 2010

    If the amp is in protect mode, it probably has shorted output transistors. To eliminate other possible problems, do the following. I'll assume that you've checked the amplifier's on-board fuses. Disconnect all speaker wires from the 'amplifier's speaker terminals' and disconnect RCA/signal cables from the amp. If it powers up normally, the speakers/wiring need to be checked. If it still shuts down (goes into protect mode), the amp almost certainly has shorted output transistors and will need to be repaired. If the amp only shuts down when it's driven to relatively high volume, you need to confirm that you have sufficient power supply voltage. With your multimeter set to DC volts, the black meter probe on the ground terminal of the amp (not on the point where the ground wire connected to the vehicle) and the head unit on (so the amp will have remote voltage applied), touch the red probe alternately to the B+ and remote terminals of the amp. If the voltage is below ~11 volts, you need to check the wiring feeding whichever line is too low. If both the B+ and remote turn-on lines are low and your battery is fully charged, you may have a bad ground connection.

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REMOVE THE RCA INPUTS AND DISCONNECT THE SPEAKERS, THEN POWER THE AMPLIFIER UP WITH THIS NO INPUT, NO SPEAKER LOAD CONDITION. IF IT STILL GOES INTO PROTECTION AND YOU HAVE VERIFIED THAT THE POSITIVE AND ESPECIALLY THE GROUND CONNECTIONS, ALONG WITH THE REMOTE CONNECTIONS ARE 100%, THEN THE AMPLIFIER WILL NEED TO BE SERVICED. ANOTHER PROBLEM WHICH IS A LITTLE RARE, IS THAT SOMETIMES THE RADIOS REMOTE OUTPUT WILL SAG BELOW 11 VOLTS AND THE AMPLIFIER WILL NOT TURN ON. IF YOU CANNOT MEASURE THE REMOTE LEADS VOLTAGE, SIMPLY DISCONNECT IT AND TEMPORARILY INSTALL A JUMPER BETWEEN THE POSITIVE TERMINAL AND THE REMOTE TERMINAL OF THE AMPLIFIER AND THIS SHOULD FORCE THE AMPLIFIER ON, BUT IF IT DOES NOT, IT WILL DEFINITELY NEED SERVICE, AS YOU HAVE TOTALLY SIMULATED A BENCHED CONDITION THAT IS TOTALLY INDEPENDENT OF YOUR INSTALLATION. LET ME KNOW IF YOU NEED FURTHER ASSISTANCE.....V

Posted on Jan 06, 2010

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