Precor C954i Service Manual download pdf (Page 27)

C954, C956 Treadmill

Page 27

Procedure 5.5 - 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 units handlebar or from a Polar heart

rate chest strap transmitter. Refer to Diagram 5.4 and verify that no jumpers are equipped on

J13, J14, J15 or J16. Also, verify that there is a jumper equipped on the internal chest strap

setting. The internal chest strap setting is the two left hand pins on the three pin connector as

shown below in Diagram 5.4. These settings allow the heart rate system to operate on the

internal chest strap receiver with the chest strap heart rate priority. That is, if both a chest strap

and hand heart rate signal is being received, the system will accept the chest strap signal and

ignore the hand held signal. If a chest strap signal is not being received, the system will accept

the hand held signal.

Note:

There are four typical failure modes for the hand held/chest strap heart rate system. They are:

1 - hand held is normal - no chest strap reading; 2 - no hand held reading - chest strap normal;

3 - no hand held or chest strap reading; 4 - constant or intermittent readings when neither hand

held or chest strap are in use.

Diagram 5.4 - Hand held/chest strap heart rate PCA

Normal hand held reading - No chest strap reading

1. Set the on/off switch in the “on” position and access the diagnostic program (Procedure 2.1).

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 Polar heart rate test receiver, verify the operation of the chest strap transmitter

furnished with the unit. If the Polar heart rate test receiver does not receive a signal, replace

the chest strap transmitter.

J13

J14

J15

J16

5 Vdc

Gnd

Lower Right

Upper Right

Upper Left

Lower Left

HR Output

o o o

Internal Chest

Strap Setting

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 72 73

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Precor C954i Service Manual Page 27