Procedure 6.6 - Troubleshooting Hand Held Heart Rate - Precor RBK 815 Service Manual

Procedure 6.6 - Troubleshooting Hand Held 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 held heart rate contacts on the unit's handlebar or
from a Polar heart rate chest strap transmitter. The PCA is configured 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 6.4 - Heart Rate Printed Circuit Board
Lower Left
Upper Left
Upper Right
Lower Right
Normal hand held reading - No chest strap reading
1.Access the diagnostic program (Procedure 3.1). 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.
RBK 815 Recumbent Cycle
Ground
Vdc
HR out
Page 29