Power-One NRG350‑4003 is a high‑current DC power supply used in industrial control and aviation systems, offering multiple output rails (e.g., 12 V/10 A, 5 V/35 A). Common failure points for this class include overheating of the main switching regulator, degradation of capacitors on the output stages, and failure of the input rectifier bridge under surge conditions. First‑check diagnostics: verify that the unit receives proper AC input voltage and that the main transformer is not saturated; inspect the output rails with a multimeter for correct voltages and look for bulging or leaking electrolytics; review any error codes from connected controllers for indications of power supply faults.[oss-gpt-20b]