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Amplifi 150 +-45 volt power supply not present

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Hi there, the power supply doesnt have either + nor - 45 volt power supply present. The other voltages are OK.

First question, for a working unit should there be +-45volt present at the output of the power supply or is there a possibility that it is switched off due to some settings on the amp?

Does anybody have experience in fixing the power board and can recommend where to look as I dont have a schematic.


I suspect that the fault is in one 8 pin chip: 5181 PQAC it gets the output signals from the SG3525AP but I could not find the 5181 anywhere.

Does anybody know what that chip actually consist of ???


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