Westamp 33901‑1 is a compact industrial AC‑DC switch‑mode power supply used to provide regulated output for servo drives and control panels. Common failure points in this class include capacitor degradation on the input/output filter stages, overheating of the switching MOSFETs or rectifier bridge, and failure of the internal voltage regulator IC due to overvoltage spikes. First‑check steps: verify that the unit receives the correct mains voltage and that the output rails are within spec; inspect for bulging or leaking electrolytics and visually confirm no burnt traces on the PCB; review any diagnostic LEDs or error codes supplied by the host controller for indications of protection trips.[oss-gpt-20b]