Miller 246488K Circuit Board

The Miller 246488K is a Power/Auxiliary Regulator Circuit Card used in Trailblazer 275‑325 welders to supply regulated DC power and auxiliary functions such as arc control and lamp regulation. Common failure points for this class of regulator boards include burnt or cracked voltage regulator ICs, degraded electrolytic capacitors on the high‑current rail, and damaged protection diodes that can short the output under fault conditions. First‑check diagnostics: verify input mains supply voltage and polarity, inspect the board for visual signs of component damage (burn marks, bulging caps), and test the regulated outputs with a multimeter while monitoring for over‑voltage or dropout during a brief power‑on cycle.[oss-gpt-20b]

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