Description
Error 22 indicates that the drive
motor (running belt) has been instructed to start, by either
manual or program control, and the
monitoring system has not received any response from the
speed sensing system indicating that
the drive motor has started.
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. Drive motor brushes are bad.
3. The speed sensor position
relative to the speed sensor target is incorrect.
4. The speed sensor potentiometer
adjustment is incorrect (when equipped).
5. The speed sensor is inoperative.
6. The lower PCA is bad.
7. The lower PCA to upper PCA
interconnect cable is bad.
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. If the motor brushes do not make
sufficient contact with the motor commutator, the drive
motor will not start when drive voltage
is applied. Replace both drive motor brushes.
3. Adjust the speed sensor position
so that the space between the speed sensor and the speed
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. On hall effect speed sensors (magnetic sensor)
the space between the end of the
speed sensor and the flywheel tooth should be 3/16 inch.
4. 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.
5. If the speed sensor in
inoperative the drive motor will start and run briefly before the error 21
occurs. If it is possible to access
the speed sensor wiring, measure the D.C. voltage between
the speed sensor leads Two of the
leads will constantly read approximately 5 Vdc. Two of the
leads will toggle between 0 Vdc. and
5 Vdc. as you slowly rotate the speed sensor target. If
you do not see both measurements
above, the speed sensor is inoperative and must be
replaced. In some cases the speed
sensor is mounted on the lower PCA and the the lower
PCA must be replaced.
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.
