Systro CPM 393104 9005 is an industrial servo‑drive controller used in CNC spindle or motor applications. Common failure points for this class of units include degraded power‑rail capacitors, burnt‑out MOSFETs or IGBT modules, and failed digital I/O buffers; overheating can also trigger internal protection shutdowns. Begin troubleshooting by verifying the input voltage and current against spec, inspecting all surface‑mount components for discoloration or burn marks, and checking the drive’s diagnostic LEDs or serial error logs for fault codes. If power is stable and no obvious component damage is seen, test the controller’s communication interface (e.g., RS‑232/Modbus) and confirm that all peripheral devices are correctly connected and powered.[oss-gpt-20b]