Toyo Denki VF61‑I is an industrial AC inverter/drive used for motor control in conveyor, packaging, and CNC applications. Common failure points for this class include over‑current protection trips, capacitor degradation on the DC bus, MOSFET or IGBT burnout from thermal overload, and firmware corruption leading to error codes such as “E01” or “E02.” Begin troubleshooting by verifying that the input voltage is within spec and that the main power supply rails are stable; inspect the DC bus capacitors for bulging or leakage. Next check the drive’s diagnostic LEDs or serial log for specific fault codes, then perform a visual inspection of the PCB for burnt components or solder bridges before proceeding to component‑level testing.[oss-gpt-20b]