Precor Cardio Theater Integrated Bracket C764i, Manual

Page: 37 / 103

C762, C764, C764i Stairclimber
Page 37
11. If neither a chest strap signal or a hand held signal is being accepted, measure between the
“ground” and “5 Vdc” pins on J2 for 5 Vdc. If 5 Vdc is present, replace the heart rate PCA.
12. If 5 Vdc is not present, remove the connector from J2 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
13. Verify that a ferrite core is clamped around the heart rate PCA to upper PCA cable.
14. 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.
15. Temporarily, disconnect the external heart rate receiver from the heart rate PCA. Set the
on/off switch in the “on” position and repeat the procedure in step 5.
16. 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.
17. 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.
18. Set the on/off switch in the “off” position, and replace the external heartbrate receiver to the
heart rate PCA. Re-locate all potential sources of radiation. Set the on/off switch in the “on”
position and repeat the procedure in step 5.