The TDK 1SR is an industrial DC‑DC power supply module used to provide regulated low‑voltage outputs (typically 3.3–30 V) for control boards and sensor arrays. Common failure modes include input over‑voltage or ripple causing the internal protection circuitry to trip, output voltage drift due to capacitor or inductor aging, and thermal shutdown from overheating of the switching regulator. First‑check diagnostics should verify that the supply receives clean, within‑spec input voltage; measure the output under load for regulation accuracy; inspect for visible signs of component damage (burnt traces, swollen electrolytics) and confirm no fault flags on the controller’s status LEDs or diagnostic registers.[oss-gpt-20b]