The Tecnomagnete ST100F is an electronic controller for magnetic chucks used in milling and grinding operations, providing power regulation and safety interlocks to the chuck’s electromagnet. Common failure points on this model include a burnt or tripped main transformer, degraded MOSFETs or IGBT modules due to overheating, and failure of the built‑in current sense resistor leading to over‑current protection trips. Initial diagnostics should verify that the 48 V DC supply is within spec, inspect the power transformer and rectifier for signs of arcing or burnt windings, and check the status LEDs and error codes on the controller’s front panel for indications of over‑temperature or short‑circuit conditions.[oss-gpt-20b]