Description
Error 23 indicates that the speed
sensor signal was lost while the treadmill was in operation.
Possible
Causes
1. The treadmill utilizes an optical
(infrared) speed sensor and the line of sight between the
speed sensor and the speed sensor
target is obstructed.
2. The speed sensor position
relative to the speed sensor target is incorrect.
3. The speed sensor potentiometer
adjustment is incorrect.
4. The speed sensor or drive motor
wiring has an intermittent connection.
5. The drive motor brushes are badly
worn and not making sufficient contact with the drive
motor commutator
6. The lower PCA is bad.
7. The lower PCA to upper PCA
interconnect cable is intermittent.
8. The upper PCA is bad
Possible
Remedies
1. Carefully, vacuum out the drive
motor compartment with a static safe vacuum cleaner. Pay
special attention to the area
between the speed sensor and speed sensor target.
2. Adjust the speed sensor position
so that the space between the speed sensor and the sped
sensor target is 3/16 inch and so
that the speed sensor photo eye is aimed at the larger
portion of the targets wedge shaped
section
3. Locate the speed sensor
potentiometer on the lower PCA. Set the speed sensor
potentiometer at mid-range. Start
the treadmill and increase the speed to 6 mile per hour.
Carefully adjust the speed sensor
potentiometer to the point where the treadmill is operating
the smoothest. Increase the
treadmills speed to full speed at repeat the previous adjustment.
These two adjustments are typically
small and are usually only a matter of fine tuning.
4. Physically test all wiring and
wire connections associated with the speed sensor and drive
motor. Replace or repair wiring and
wire connections as appropriate.
5. Replace both drive motor brushes.
6. Substitute a known good lower PCA
to determine if the lower PCA is bad.
7. Substitute a known good interconnect
cable for the existing cable.
8.
Substitute a known good upper PCA to determine if the upper PCA is bad.