Precor 9.31 Manual page 29

No hand held reading - Normal chest strap reading
4. Access the diagnostic program (Procedure 3.2). Advance to the heart rate display
portion of the diagnostic program. Verify that a hand held signal is not being accepted
by firmly grasping both the right and left hand held contacts on the handlebars. Cover
as much of the contact surface area with your hands as possible (without moving your
hands), you should receive a heart rate reading within ten seconds.
5. If the hand held signal is now being accepted, something in the near vicinity is radiating
RF (radio frequency) energy that is being received by the chest strap portion of the
heart rate PCA.
6. If a hand held signal still not being accepted, skip to step 8.
7. Replace the heart rate PCA with a 43579-108 (or higher) heart rate PCA. 43579-108
and higher versions of heart rate PCA are less susceptible to radiated RF energy.
8. Access the diagnostic program (Procedure 3.2). Advance to the heart rate display
portion of the diagnostic program. Verify that a hand held signal is not being accepted
by firmly grasping both the right and left hand held contacts with the opposite hands,
right hand on the left handlebar contacts and left hand on the right handlebar contacts.
Cover as much of the contact surface area with your hands as possible, you should
receive a heart rate reading within ten seconds. If a hand held signal is still not being
accepted, skip to step 10.
9. If a hand held signal was accepted in step 11, the hand held contact wiring is reversed.
The end of the wire harness that connects to the hand held contacts in the handlebar is
segregated into two groups. One group has blue shrink wrap around it and the other
group has black shrink wrap around it. The "blue" group must go to the right hand
contacts and the "black" group must go to the left hand contacts. In both groups the
black wire must go to the lower contact and the red wire must go to the upper contact.
If necessary, rewire the hand held contacts as described above and test as described
in step 4.
10. If the wiring is correct, refer to Diagram 6.3 for the following measurements. With an
ohmmeter measure between the "lower right contact" pin on the J1 connector and the
lower right hand held heart rate contact on the handlebar. The reading should be 1 Ω or
less. Measure between the "upper right contact" pin on the J1 connector and the upper
right hand held heart rate contact on the handlebar. The reading should be 1 Ω or less.
Measure between the "upper left contact" pin on the J1 connector and the upper left
hand held heart rate contact on the handlebar. The reading should be 1 Ω or less.
Measure between the "lower left contact" pin on the J1 connector and the lower left
hand held heart rate contact on the handlebar. The reading should be 1 Ω or less. If
any of the above readings are greater than 1 Ω, replace the heart rate PCA to
handlebar wire harness.
9.31, 9.33, 9.35 Treadmill
Page 29