The Tamura OVS‑24H‑UC is an enclosed AC‑to‑DC switching power supply that delivers a single 24 VDC output at up to 12 A from a 90–264 VAC input. Common failure modes for this class of units include degraded electrolytic capacitors, burnt-out rectifier diodes or MOSFETs, and overheating due to inadequate ventilation or over‑current conditions, which often manifest as a drop in output voltage or an audible “buzz.” First‑check diagnostics should verify that the unit receives proper input voltage and current, inspect for visual signs of component damage (burn marks, bulging caps), confirm the output voltage with a multimeter under load, and review any error logs or indicator LEDs for fault codes.[oss-gpt-20b]