Efratom 105450‑001 is a modular AC power supply (MPS‑AC) originally from Motorola Datum and later produced by Symmetricom for use in precision timing and frequency test equipment. Common failure modes on this model include degraded electrolytic capacitors causing output ripple or voltage sag, overheating of the internal switching regulator, and failure of the input protection circuitry to handle over‑voltage spikes. Begin troubleshooting by verifying that the unit receives its rated AC input voltage and measuring the DC output rails for correct voltage and acceptable ripple; inspect all capacitors for bulging or leakage and check the main transformer windings for insulation breakdown. Next, examine the temperature of the regulator and surrounding PCB area under load, and review any error codes displayed on the front panel or communicated via serial interface to rule out firmware‑level shutdowns.[oss-gpt-20b]