Bycan Blue Angel Power Supply (BA‑14/2850) is a dual‑output aircraft ramp power supply providing filtered 14 V and 28 V DC at up to 50 A for avionics testing or battery recharge. Common failure modes on this class of units include overheating of the output transformers, failure of the main rectifier bridge due to overcurrent, and degradation of the filtering capacitors which can cause ripple spikes. For a first‑pass check, verify that the input AC is within spec and that the unit’s internal fuse or circuit breaker is intact; then confirm the 14 V and 28 V outputs with a calibrated multimeter while monitoring for excessive heat on the transformer windings. Finally, inspect the output connectors for corrosion or loose pins and review any diagnostic LEDs or error codes displayed on the front panel.[oss-gpt-20b]