Repair Item: Weir Power Supply SMM200NTM23
Problem Description: 24 V Output not working.
Troubleshooting this unit was difficult because the problem was intermittent. Sometimes the 24 Volts was present. After replacing the usual devices did not fix the problem, we found a Darlington transistor in the Pulse Width Modulation circuit that was not operating properly. Replaced the transistor and the voltages became stable. Tested the unit under load and returned to customer
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