No Belt Movement - True Fitness 350-750 Service Manual

Symptom
Treadmill in need of
NO BELT
calibration.
MOVEMENT
Missing command to
PWM.
Missing/incorrect
voltage to motor.
Damaged motor.
Support Services 800-883-8783
Probable Cause
Continue on next page...
Mon-Fri 8:30am-5:00pm Central Time Zone
Corrective Action
•
Run calibration. (page 16)
--------
•
Is PWM light blinking/ illuminated
when fast button is pushed?
NO- Check continuity on wire harness, if
harness has continuity breaks replace the
harness. If harness has continuity- replace
the upper panel. Refer to wiring harness
diagram for your model.
YES- move on to next step, wire harness and
control panel are OK.
--------
•
With treadmill in calibration mode
(page 16)
•
Set speed at 4 MPH
•
Check VDC across MTR 1 and MTR 2
with the motor leads connected to the
motor the voltage should measure 10
VDC for every 1 MPH.
•
If voltage is missing or low- Replace
PWM.
•
If voltage is greater than 20 VDC/MPH
motor may have open windings.
--------
•
With PWM LED Blinking/ Illuminated-
move the tread belt with your foot to see
if motor begins to move on its own.
•
If motor begins to move, inspect the
condition of the brushes and the
commutator.
•
If brushes are bad- replace brushes
•
If motor doesn't turn or has a damaged
com segment- replace motor.
Recommended Tools
Multi-meter
PWM / Motor test
cables
Note:
All trouble
shooting should
be performed in
calibration
mode.
Page 16
Fax: 636-272-7148
Page 5