Lightolier LM-4-1200 2-20-218-1 Light dimmer/controller

The Lightolier LM‑4‑1200 (model 2‑20‑218‑1) is a four‑channel LED dimmer/controller used in commercial lighting arrays. Common failure points for this class of dimmers include burned or degraded MOSFETs, capacitor leakage on the power supply board, and faulty opto‑coupler inputs that can cause erratic channel behavior or complete loss of control. First‑check diagnostics: verify the 120 V AC input and monitor the DC rail voltage with a multimeter; inspect all surface‑mount components for visible damage or corrosion; and review any error codes displayed on the panel or communicated via serial/USB to isolate the malfunctioning channel.[oss-gpt-20b] Post Comment

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