Carlo Gavazzi 509SZ018‑01 is a compact, open‑frame switch‑mode power supply designed for industrial control and automation equipment. Common failure points for this model include overheating of the internal switching regulator, degradation of the output capacitors, and failure of the input filtering network; these often manifest as voltage ripple or sudden shutdowns. First‑check diagnostics: verify that the unit receives its rated input voltage and that no input surge protection devices are tripped; inspect the output for correct voltage under load and look for signs of thermal stress on the regulator PCB; finally, examine all solder joints and component leads for cracks or burn marks before proceeding with deeper troubleshooting.[oss-gpt-20b]