The Aerobics Inc. 9501002 Pacemaster PWM Processor is the control board that drives the upper display and membrane interface on Pro‑Plus treadmills, handling speed, incline, and workout programming via PWM signals. Common failure modes for this unit include burned or tripped MOSFETs in the power stage, degraded capacitors on the 5 V rail, and shorted I/O lines to the LCD or touch panel; overheating of the board often points to a failing cooling fan or blocked heat sink. First‑check diagnostics: verify that the main 48 V supply is present and stable, inspect the board for obvious burn marks or swollen electrolytics, and confirm all PWM output signals are within spec using an oscilloscope before proceeding with component replacement.[oss-gpt-20b]