The Emacs SP2‑4400FB (72‑0) 6SP2‑400B046 is a 400 W industrial switching power supply that accepts 115 VAC or 230 VAC at 50/60 Hz and delivers 5 VDC and 12 VDC outputs. Common failure modes for this model include degraded electrolytic capacitors on the input filter, overheating of the internal fan or heat sink leading to thermal shutdown, and transformer winding insulation breakdown that can cause shorted secondary windings. Initial checks should verify input voltage and frequency with a multimeter, inspect the output rails for correct DC levels, and visually confirm no blown fuses, damaged capacitors, or fan obstruction; if error codes are present on an attached controller, review them against the unit’s diagnostic log.[oss-gpt-20b]