The Protek PA95‑37 is an open‑frame industrial power supply used in CNC machines, servo drives and other precision equipment. Common failure modes for this class of units include tripped or failed MOSFETs/IGBTs, degraded capacitors on the output or input rails, overheating of the heat sink, and failure of the internal voltage regulator IC. Begin troubleshooting by verifying that the unit receives its rated input voltage and checking for any visible signs of burn‑damage or swollen electrolytics; next test the output rails with a calibrated multimeter while the load is disconnected to confirm regulation; finally inspect the thermal interface between the heat sink and the power device, replacing any cracked or loose mounting hardware.[oss-gpt-20b]