917, 917si Treadmillr
Page 22
Procedure 5.4 - Troubleshooting the Speed Sensor
1. Remove the top front and bottom front covers.
2. Plug the line cord into an AC outlet and set the circuit breaker in the “on” position.
3. Use a digital voltmeter, set for DC volts, to measure the voltage between terminal 1 (green)
and terminal 2 (white) of the J1 connector on the lower PCA.
4. Slowly rotate the drive motor, the voltage should alternately switch from near 0 Vdc to near
5 Vdc as the target disk passes through the speed sensor.
Diagram 5.3 - Speed Sensor
5. If the voltage in step 4 switches between approximately 0 Vdc and 5 Vdc, the speed sensor
is functioning correctly.
6. If the voltage in step 4 is incorrect, remove the J1 connector from the lower PCA. Measure
the voltage between terminals 1 an 4 of the J1 connector on the lower PCA. Terminals 1
and 4 are the terminals that mate with the green and red wires when the speed sensor
connector is inserted into the lower board. If the voltage does not measure approximately 5
Vdc, replace the lower PCA.
Drive Motor
Drive Belt
Target Disk
Tensioner
Speed Sensor
Motor Mounting
Bolts
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