The CEC PS‑264B/PS‑CH‑166C is an industrial DC power supply module used to provide regulated output to control electronics and servo drives. Common failure modes for this class of units include electrolytic capacitor degradation on the input or output stages, transformer winding insulation breakdown, and failure of linear regulator ICs or switching controller chips under over‑voltage or thermal stress. First‑check diagnostics should verify that the unit receives proper 100–240 VAC input, measure the regulated DC output for correct voltage and ripple, inspect for bulging or leaking capacitors, and examine the PCB for burnt components or broken traces before proceeding to component replacement.[oss-gpt-20b]