The Rantec SMI‑20‑05 is a high‑voltage industrial power supply used to provide regulated DC output for servo drives, motor controllers or other precision equipment. Common failure points on this model include degraded capacitors and overheating of the internal switching regulator; users often report intermittent operation or complete loss of output when the supply’s heat sink becomes clogged or the input voltage dips below spec. Begin troubleshooting by verifying that the unit receives its rated AC input voltage, checking for any visible signs of component damage (burnt caps, cracked PCB traces) and measuring the DC output with a multimeter; if the output is abnormal, inspect the regulator IC and associated heat sink for overheating or failure.[oss-gpt-20b]