Precor C576i Service Manual page 30

15. Refer to Diagram 6.5 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.
No hand held reading - No chest strap reading
16. Access the diagnostic program (Procedure 3.2). Advance to the heart rate display portion of
the diagnostic program. Verify that neither a chest strap signal or a hand held signal is being
accepted with either a heart rate test transmitter or a chest strap transmitter.
17. Check the plug/connector connections on both the heart rate PCA (J4), and upper PCA (J1).
18. If neither a chest strap signal or a hand held signal is being accepted, measure between the
"ground" and "5 Vdc" pins on J4 for 5 Vdc. If 5 Vdc is present, replace the heart rate PCA.
19. If 5 Vdc is not present, remove the connector from J4 of the heart rate PCA. Measure
between the "ground" and "5 Vdc" pins of the connector (just removed from the heart rate
PCA) for 5 Vdc. If 5 Vdc is present, replace the heart rate PCA. If the 5 Vdc is not present,
measure between the corresponding pins of J1 on the upper PCA (red and black wires). If 5
Vdc is not present replace the upper PCA. If 5 Vdc is present, replace the upper PCA to
heart rate PCA cable.
Constant or intermittent readings when neither the hand held or chest strap is in use
20. Verify that a ferrite core is clamped around the heart rate PCA to upper PCA cable.
21. Constant or intermittent heart rate readings when neither heart rate system is in use is
caused by something in the near vicinity radiating RF energy that is being received by the
chest strap portion of the heart rate PCA.
22. Temporarily, install a spare jumper on J14 of the heart rate PCA (hand held priority). Repeat
the procedure in step 6.
23. If the hand held signal is now being accept, something in the near vicinity is radiating RF
energy that is being received by the chest strap portion of the heart rate PCA. Disabling the
chest strap signal proves that it is radiated energy that is causing the problem.
24. The source of the radiated energy must be determined and relocated so that it no longer
affects the heart rate PCA. Televisions, cell phones, Cardio-theatre receivers, etc. are
possible sources of radiated energy.
25. Remove the spare jumper from J14 of the heart rate PCA. Re-locate all potential sources of
radiation. Repeat the procedure in step 6.
C576i Self Powered Elliptical Fitness Crosstrainer
Page 30