Speed Sensor Troubleshooting
Troubleshooting the Speed Sensor system.
Circuit Description
The speed sensor is a reed switch. A magnet is mounted on the step-up pulley. The magnet
passes the speed sensor once per revolution. The output from the speed sensor is a 5 Vdc
square wave, the frequency of which indicates the operating speed. When a square wave
output is not being generated from the speed sensor the system assumes the unit is not in
use.
Procedure
1. Remove the upper and right rear covers. Set the on/off switch in the “on” position.
Operate the unit. If the system timer has not started and a stride rate is not displayed,
the speed sensor is not operative. We shall use the presence of a stride rate to
determine when the speed sensor is functioning normally.
2. A magnet must be installed in the step-up pulley. If the stride rate is not being dis-
played in step 1, verify that a magnet is installed in the step-up pulley.
Contact Precor Customer Support at support@precor.com or 800.786.8404 with
any questions.
Page 225
7 Troubleshooting
System Troubleshooting Procedures
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