The Nabtesco AR13A140‑BAT is a compact all‑in‑one single‑axis actuator that integrates a servo motor, reduction gear, holding electromagnetic brake and encoder into one flat unit. Known failure modes for this class include power supply or drive voltage irregularities, wiring insulation degradation, encoder mis‑alignment or loss of signal, overheating of the motor or brake due to overcurrent, and mechanical wear in the internal bearing or gear train. First‑check diagnostics should verify the input power integrity (voltage, phase balance), inspect all I/O connections for continuity and proper polarity, confirm encoder output against a known good reference, and review any error codes from the servo drive for indications of brake or motor faults.[oss-gpt-20b]