Gossen Konstanter S63S12/15BU10/8 is a dual‑output DC power supply module capable of 12 V or 15 V at up to 10 A, commonly used in industrial test rigs and laboratory equipment. Common failure modes for this class include output voltage sag due to degraded switching transistors, overheating of the internal heat sink, and capacitor leakage on the output filtering stages; external symptoms often appear as over‑current trips or erratic voltage regulation. First‑check diagnostics: verify input mains continuity and correct polarity, measure the 12 V/15 V outputs with a calibrated multimeter while monitoring current draw, inspect for visible signs of thermal damage or blown capacitors, and review any error codes displayed on the module’s indicator LEDs.[oss-gpt-20b]