Speed Sensor Test - True Fitness TREADMILL 2011 Service Manual

Speed Sensor Test (TPS Series/ Z Series)
This test will expose the technician to a potential
pinch hazard. Exercise caution when performing test.
1. Remove the motor cover and verify that the speed sensor is
between 1/8" to 1/4" away from the roller pulley (TPS
Series, Z series).
2. Turn the flywheel on motor so that there is belt movement.
Verify that the speed LED blinks on the lower board when
there is movement at the speed sensor.
3. If the Speed LED does not blink, replace the speed sensor.
On the optical sensor, measure DC volts between pins 2 and
3 of the speed sensor plug while plugged into the lower
board. There should be a reading of 5VDC(on) to below
1VDC(off). Readings of 1.90VDC or higher during the off
cycle could cause the RPM LED to not cycle and will result in
a speed error.
If this speed sensor test is successful replace the lower
board. If the speed sensor test fails replace the speed
sensor.
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Optical Sensor Test (TCS Series)
Tread Service Manual - July 2011
TEST PROCEDURES
31