The Zeck ZKS‑915T is a 115/230 V industrial AC‑DC power supply rated at 3.0 A (or 1.5 A) with a 60/50 Hz input, commonly used to feed heavy‑duty hydraulic or construction equipment controllers. Known failure modes for this class of switch‑mode supplies include output voltage sag due to capacitor degradation, transformer winding insulation breakdown, and failure of the internal MOSFETs or rectifier diodes under overvoltage conditions. First‑check diagnostics: verify input mains continuity and correct voltage; measure output DC rail with a multimeter while the unit is powered on; visually inspect for burnt components, swollen electrolytics, or arcing on the PCB; review any error codes or indicator LEDs that may point to protection trips.[oss-gpt-20b]