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Testing Speed Sensor
Troubleshooting
49
6.8.
Testing Speed Sensor
The speed sensor is an optical emitter/detector assembly that has its light beam interrupted by a toothed speed
wheel affixed to the motor’s shaft. When the speed wheel rotates the teeth interrupt the light emitted by the sensor’s
LED and thus creates a pulse train from the detector. This pulse train is used by the PWM motor control board to
determine motor speed. Verify the sensor’s operation as outlined in the following procedure:
1. Unplug the treadmill.
2. Remove the motor cover. the following figure shows the speed sensor cover.
Figure 6-1.
Speed Sensor Cover and Motor Control PCB Locations
3. Remove the two nuts holding the sensor cover (see the following figure) using the 7/16” socket, 2” extension
and 3/8” ratchet.
Figure 6-2.
Speed Sensor Cover Hardware
4. Slide the cover off to see the speed sensor components, see the following figure.
Speed Sensor Cover
PWM or SCR Motor
Control PCB
Cover Screws
Summary of Contents for L7 Club
Page 1: ...L7 L8 L9 Treadmill 90 Series Service Manual...
Page 4: ...Grounding Instructions 4...
Page 16: ...Introduction Recommended Tools 16...
Page 26: ...Electrical Reference Harnesses 26...
Page 30: ...Routine Maintenance Maintenance Checklist 30...
Page 102: ...Replacement Parts 102 Figure 8 8 Control Panel 17 16 15 13 14 12 11 11 9 5 3 7 6 2 4 8 1...
Page 116: ...Replacement Parts 116...
Page 119: ......