The Astec MP6‑1Z‑1F‑1F‑1W‑4NN‑0M is a modular switching power supply (typically 600–800 W) used in industrial automation and control cabinets. Common failure modes for this series include blown fuses or internal protection trips, degraded electrolytic capacitors causing output ripple or voltage sag, overheating of the heat sink or fan leading to thermal shutdown, and damaged output connectors or solder joints from vibration. For a first‑pass diagnosis, verify that the input mains is within spec and the unit’s fuse is intact; then measure each of the six regulated outputs with a multimeter for correct voltage levels and continuity on the output rails; finally inspect the heat sink, fan, and internal capacitors for signs of burn or bulging.[oss-gpt-20b]