Precor P80 Operating And Maintaining page 124

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Connecting the Heart Rate Sensor Cable
The heart rate sensor cable passes through the cutaway
opening at the upper left corner of the back plate, then down
to the small circuit board at the lower left of the console. The
following illustration shows how the cable should look once it
is installed.
Figure 26: Connecting the heart rate cable
Assembling and Maintaining TRM 800-Series Treadmills