The Mean Well RSP‑1000‑27 is a 1 kW enclosed AC‑to‑DC converter delivering 27 V at up to 37 A with built‑in active current sharing and fan cooling. Common failure points for this series include fan motor burnout, input transformer winding insulation breakdown, output regulator IC overheating, and protection circuitry (over‑current/over‑temperature) tripping due to load spikes or inadequate ventilation. First‑check diagnostics: verify the 90–264 VAC input supply and confirm the unit’s ON status; measure the 27 V output under no‑load and with a known resistive load while monitoring fan operation and temperature rise; inspect for visible signs of burnt components, loose connections, or dust accumulation that could impair cooling.[oss-gpt-20b]