The Trumpf 853936 is a high‑performance servo drive (BUM60S series) used to amplify and control motor torque in CNC machines. Common failure points for this class of drives include power supply degradation, over‑temperature shutdowns from cooling fan or heat sink issues, faulty input/output signal conditioning modules, and PCB component failures such as electrolytic capacitors or MOSFETs. First‑check diagnostics should begin with verifying the main AC supply voltage and isolation to ensure proper line levels; then inspect the drive’s internal temperature sensors and cooling system for obstructions or fan failure; finally review any error codes displayed on the drive’s panel or communicated via the machine’s control interface to pinpoint specific fault modules.[oss-gpt-20b]