Precor 43550-303 Treadmill Board

Precor 43550‑303 is the lower motor control PCB used on M9.x series treadmills (M9.31, M9.33i, M9.35i). Common failure modes include capacitor degradation or shorting, relay wear, and damaged input/output traces that interrupt motor drive signals. First‑check diagnostics: verify 24 V DC supply to the board, inspect all electrolytic capacitors for bulging or leakage, and test I/O pins with a multimeter or oscilloscope for proper voltage levels; review any error codes displayed on the treadmill’s console.[oss-gpt-20b]

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