Elbag WSMS 4.8 is a 230‑V industrial stepper motor drive rated at 320 VA with RS‑232 communication capability. Common failure points for this class of drives include overheating of the power MOSFETs, degradation of the onboard voltage regulator, and failure of the serial interface circuitry due to moisture or vibration. Initial checks should verify that the input supply is within spec (230 V ±10 %) and that the drive’s status LEDs are operating; then inspect for burn marks on the PCB and confirm proper grounding. Finally review any error codes displayed on the RS‑232 terminal or internal diagnostic display, and test the output phase currents with a multimeter to rule out coil winding faults.[oss-gpt-20b]