Telkoor 900‑3002‑50 is a CompactPCI AC‑3U‑200 power supply rated 100–240 VAC input and providing dual DC rails (5 V/12 V) up to 0.5 A and 20 A respectively, with active power‑factor correction. Common failure points for this class include overheating of the internal switching regulator, blown output fuses or damaged MOSFETs, and degraded AC input filtering capacitors that cause ripple on the DC rails. First‑check diagnostics: verify the incoming AC voltage and continuity to the PSU case, measure both DC outputs with a multimeter while the unit is powered (ensuring no over‑voltage), inspect for visible signs of overheating or burnt components, and review any error codes logged by the host CompactPCI chassis.[oss-gpt-20b]