The Bycan Blue Angel BA‑14/28‑50P is a dual‑voltage aircraft ramp power supply and battery charger that delivers filtered 14 V or 28 V DC at up to 50 A for avionics testing and battery recharging. Common failure points on this model include the ferro‑resonant regulator, input/output fuses, and the internal switching transistors; overheating can also damage the output filter capacitors. First‑check diagnostics: verify that the unit receives proper 115/230 V AC input and that the main breaker/fuse is intact; measure the DC output under load to confirm correct voltage and current rating; inspect for visible signs of component burn or corrosion, especially around the regulator and connector terminals.[oss-gpt-20b]