Astec VS3‑C8‑C8‑20 (73‑190‑6015CE) is a rugged 18 VDC, 100 A industrial DC power supply rated at 2 kW with active fan cooling and a wide input range of 115–230 VAC. Common failure modes for units of this class include overheating due to blocked airflow or dust accumulation on the heat sink, capacitor degradation leading to output voltage ripple, and transformer winding insulation breakdown under sustained high current. First‑check diagnostics should begin with verifying that the unit receives correct line voltage and frequency, measuring the 18 VDC output at no load and under rated load while monitoring temperature of the fan and heatsink; inspect for visible signs of burn or swollen capacitors and confirm the fan motor is spinning freely.[oss-gpt-20b]