The Eldetco Inc. 2100B E50200 Feed Controller is a high‑speed servo drive controller used in industrial feed systems, providing PWM output to stepper or DC motors with built‑in overcurrent and temperature protection. Common failure modes for this class of units include burned‑out MOSFETs or IGBTs due to voltage spikes, damaged gate driver ICs from static discharge, and capacitor degradation causing unstable supply rails; the controller’s onboard diagnostic LEDs often flash in a pattern indicating power‑rail faults or motor‑driver overload. First‑check diagnostics: verify input voltage and ground continuity, inspect the main power board for burn marks or swollen electrolytics, and read any error codes via the serial/USB interface to isolate the fault source.[oss-gpt-20b]