True Fitness 350-750 User Manual
Page 7
Symptom
Probable
Cause
Corrective Action
Recommended Tools
NO BELT
MOVEMENT
Treadmill in need of
calibration.
Missing command to
PWM.
Missing/incorrect
voltage to motor.
Damaged motor.
• 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.
Continue on next page…
Multi-meter
PWM / Motor test
cables
Support Services 800-883-8783
Mon-Fri 8:30am-5:00pm Central Time Zone
Fax: 636-272-7148
Page 5
Note:
All trouble
shooting should
be performed in
calibration
mode.
Page 16