The Fuji Electric Act‑200A is a high‑current (200 A) industrial AC‑to‑DC power supply module used in motor drives and control panels. Common failure points include overheating of the internal switching transistors, degradation of the output capacitors, and wear on the input rectifier diodes; these can manifest as loss of output voltage or excessive heat under load. First‑check diagnostics: verify that the unit receives proper line voltage and that the input filter is intact; measure the output rails with a calibrated multimeter while the PSU is powered on; inspect for burn marks, swollen electrolytics, or loose connections, and review any diagnostic LEDs or error codes displayed on the front panel.[oss-gpt-20b]