The Vigoservo ARN 15‑A (model 105‑8628) is a compact industrial servo drive from Nabtesco, typically used to supply regulated power and PWM control signals to DC or AC motors in CNC or packaging equipment. Common failure modes for this class of drives include overheating of the MOSFET array, capacitor degradation on the high‑voltage side, and loss of communication with the host controller due to damaged I/O connectors or firmware corruption. First‑check diagnostics should verify that the input supply voltage is within spec and that all output rails are present; inspect for burn marks, swollen electrolytics, or loose solder joints; then review any error codes on the drive’s display or log, followed by a continuity test of the signal lines to the motor controller.[oss-gpt-20b]