The Prescolite Controls 10‑1075‑018 is a legacy analog dimmer module that was upgraded to a digital full‑featured controller during the late‑1990s retrofit program. Common failures in these units include burned or tripped MOSFETs on the output stage, degraded capacitors in the power supply section, and loss of communication with the digital control bus due to corrupted firmware or damaged ICs. Initial checks should verify that the module receives its rated input voltage (typically 120 V AC), inspect for visible component damage or burn marks, and confirm that the digital interface (e.g., RS‑485 or serial) is transmitting status bytes; if errors appear, replace the power supply board or reflash the firmware as needed.[oss-gpt-20b]