ProtoTRAK M3 is an industrial CNC controller used in small‑batch machining centers and lathes, providing 2‑ or 3‑axis motion control with a built‑in HMI. Common failure points for this model include the power supply board (overheating capacitors), the main logic PCB (burnt traces from voltage spikes), and the touch‑screen interface (LCD backlight failure or driver IC). Initial checks should verify that the 24 V DC input is present and stable, inspect the controller’s LED status indicators for error codes, and visually confirm no burnt components or loose connections on the main board. If power is correct but the machine still won’t start, test the I/O pins with a multimeter to ensure proper signal levels and review any recent firmware updates that may have introduced incompatibilities.[oss-gpt-20b]