The GEC Alsthom AMS Power Supply (AMS‑2 series, model 3300515/2300515) is a three‑phase AC‑to‑DC module used to power servo drives and industrial controllers in machine tools. Common failures on this unit include burned or cracked capacitors, degraded rectifier diodes, and overheating of the internal heat sink due to inadequate ventilation; these symptoms often manifest as loss of output voltage or intermittent drive shutdowns. First‑check diagnostics: verify input 3‑phase supply and phase balance, measure DC bus voltage for proper regulation, inspect the PCB for visible component damage or thermal stress, and review any error codes from the connected drive for indications of power‑supply faults.[oss-gpt-20b]