Horizon Fitness 1.1T Service Manual page 48

The IR comp dial should only need to be adjusted if the treadmill belt is running in a
jerky or choppy motion. To adjust the IR comp, turn the dial clockwise (to increase
voltage to motor) or counterclockwise (to decrease voltage to motor). To verify proper
adjustment, start the treadmill at 0.5 mph and ride the treadmill belt from the front to rear
roller. If the treadmill does not have any apparent jerky or choppy movement, the IR
comp is set properly.
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