EFX 885, 835, 825
Service Manual 20039-166
Page 90
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No hand held reading - No chest strap reading
11.
Access the diagnostic program (Procedure 5.1). 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.
12.
Check the plug/connector connections on both the heart rate PCA (J4), and upper PCA (J1).
13.
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.
14.
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.
1.
Verify that a ferrite core is clamped around the heart rate PCA to upper PCA cable. 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. Replace the heart
rate PCA with a 300812-101 (or higher) heart rate PCA. 300812-101 and higher versions of heart rate PCA
are less susceptible to radiated RF energy.
Summary of Contents for EFX 825
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