A Lambda Power Supply, Model ZUP 36-6, was sent to our shop with the problem description: “No Output Voltage.” Initial troubleshooting involved powering up the unit and enabling the outputs. The unit immediately presented an Alarm LED and the OVP (Over Voltage Protection) LED. An attempt to clear the alarms by resetting the OVP to high and the UVP (Under Voltage Protection) to 0.0 failed to clear either alarm. Circuit level troubleshooting revealed that the current feedback circuit was open. Component level troubleshooting revealed an open resistor. The resistor was replaced and the unit resumed normal operations.
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