Precor 9.21 Service Manual page 5

Note:
When the running belt is started, the number of power bits will be displayed. Power bits are
directly related to the drive motor input signal.
Press the SPEED
8.
decrements as the SPEED keys are pressed.
Press STOP to return to the Enter Your Weight banner.
9.
10. Turn off the treadmill with the circuit breaker, then unplug the treadmill from the wall outlet.
Diagram 2.1 - 9.21 Display
and keys. Verify that the power bits number increments and
9.21, 9.21i, 9.21S, 9.21Si Treadmill
Page 5