The Plex 200W_REV.2.1 is a high‑current, multi‑rail linear power supply used to drive servo drives, motor controllers and other industrial control equipment. Common failure modes in this class include overheating of the heavy‑duty heatsink, degradation of the internal capacitors (especially electrolytic ones on the 12 V/19 V rails), and failure of the main switching regulator or output transformers if the unit is overloaded. Initial checks should verify that the input voltage matches the specified range and that the output rails are within tolerance using a calibrated multimeter; inspect for visible signs of thermal damage, bulging capacitors or burnt components on the PCB; and review any diagnostic LEDs or error codes supplied by the control system to confirm whether the supply is cycling or stuck in protection mode.[oss-gpt-20b]