You need to open the unit and get a palstic screw driver and look for the output adjust variable resistor and turn the variable resistor. make sure you have a true rms voltmeter when your doin it. Good luck
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You need to open the unit and get a palstic screw driver and look for the output adjust variable resistor and turn the variable resistor. make sure you have a true rms voltmeter when your doin it. Good luck