CEGELEC S3315001A is a custom industrial control PCB used in GEC‑Alsthom/CEG Industrial servo drives and PLC‑style controllers. Common failure points on this board include degraded electrolytic capacitors, burnt or cracked silicon ICs (especially power regulators), and broken or corroded connector pins that can cause intermittent loss of communication or total drive shutdown. Begin troubleshooting by verifying the input voltage and current against spec, inspecting the board for visible burn marks or swollen components, and checking all I/O and communication lines for continuity and correct logic levels. If the unit still fails after these checks, perform a detailed scope trace of the power rails and signal timing to isolate any faulty sub‑circuits.[oss-gpt-20b]