TDE DSC20NBX is a 3‑phase brushless servo drive rated for 220 VAC input and designed to control DC or AC motors with sinusoidal torque regulation. Common failure points in this class include IGBT module overheating or open/short faults, power‑stage overcurrent protection trips, encoder signal loss or mis‑alignment, and controller firmware glitches that trigger error codes such as “E10” (motor overload) or “E12” (communication lost). First‑check diagnostics should begin with verifying the 220 VAC supply voltage and ripple, inspecting IGBT heat sinks for excessive temperature or visible damage, and confirming encoder signal integrity at the drive’s input terminals. Finally, review the drive’s internal error log via its keypad or serial interface to identify any persistent fault codes before proceeding with component replacement.[oss-gpt-20b]