P30 Troubleshooting Handheld Heart Rate; Hand Held/Chest Strap Heart Rate Pca; Normal Hand Held Reading - No Chest Strap Reading - Precor EFX 885 Service Manual

Troubleshooting 5.12 P30 Troubleshooting Handheld Heart Rate
Circuit Description
The hand held heart rate system is actually a dual system, that is, it can accept a heart rate signal from either the hand
for hand held priority. That is, if both a chest strap and hand heart rate signal are being received, the system will accept
the hand held signal and ignore the chest strap signal. If a hand held signal is not being received, the system will accept
the chest strap signal.
Note:
There are four typical failure modes for the hand held/chest strap heart rate system. They are: hand held is normal -
no chest strap reading; no hand held reading - chest strap normal; no hand held or chest strap reading or constant or
intermittent readings when neither hand held or chest strap are in use.
Diagram 5.12.1 - Hand held/chest strap heart rate PCA
Lower Left
Upper Left
Upper Right
Lower Right

Normal hand held reading - No chest strap reading

1. Access the diagnostic program (Procedure 5.1). Advance to the heart rate display portion of the diagnostic
program. Verify that a chest strap signal is not being accepted with either a Polar heart rate test transmitter
or a known good chest strap transmitter. If this reading is good, skip to step 3.
2. Using a known good Polar heart rate chest strap, verify that the heart rate operates with the known good
chest strap. If the known good Polar chest strap does correct the problem, replace the original chest strap
transmitter.
3. If the above procedures did not correct the problem, replace the heart rate PCA.
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EFX 885, 835, 825
Service Manual 20039-166
Ground
Vdc
HR Out
Page 88