The Lucas Ledex S‑10240‑1024 is a high‑precision rotary optical encoder that outputs 1,024 digital pulses per revolution for position and speed feedback in industrial motion control systems. Common failure modes for this class of encoders include contact degradation on the signal contacts, photodiode or LED failure due to dust or mechanical shock, and internal PCB damage from overvoltage or thermal cycling. First‑check diagnostics: verify that the supply voltage matches the encoder’s rated input (typically 5 V DC), inspect all wiring for continuity and proper termination, and examine the output pulses with an oscilloscope or logic analyzer for missing or noisy signals; review any error logs from the host controller for “encoder fault” or “signal loss” codes.[oss-gpt-20b]