Westinghouse HP‑N1221R2 is a high‑power AC‑to‑DC supply board used in industrial control panels and motor drives, delivering regulated voltages for logic, power stages, and auxiliary circuits. Common failure points on this type of board include damaged capacitors or electrolytic bulging, burnt or cracked voltage regulator chips (often the LM317/LM337 family), shorted inductors, and broken trace connections from the input filtering stage to the output regulators. For initial troubleshooting: verify that the AC input is present and within spec; check all DC output rails with a multimeter for correct voltage levels; inspect the board visually for signs of overheating or component damage, paying particular attention to the power regulator area and any decoupling capacitors.[oss-gpt-20b]