Aerobics Inc. 501009 PaceMaster Digital P.S. is a treadmill motor control power board (Rev.F) that supplies PWM and drive signals to the motor and runs the user interface LEDs. Common failure modes include a defective main power supply module, shorted or burnt voltage regulator ICs, broken trace connections on the LED driver section, or a failed MOSFET gate‑drive circuit; these often manifest as power present but no indicator lights. First‑check steps: verify 48 V DC input and correct polarity at the board’s power terminals, inspect for visible burn marks or cracked components around the voltage regulator and MOSFETs, and use an oscilloscope to confirm PWM outputs are being generated before proceeding with component replacement.[oss-gpt-20b]