Owner`s manual

54 | 2008 AFG Service Seminar [rev 1.3]
Section Three | Troubleshooting
Treadmill Troubleshooting
>> Erratic Speed
Symptom Possible Cause Test Procedure Repair
Erratic speeds - Upon
pressing start, belt speed
increases rapidly for a few
second and then comes to
a complete stop.
Failed optic sensor. -Test voltage from Optic
Sensor. Reference p32.
Replace optic sensor.
Erratic speeds - Upon
pressing start, belt speed
increases rapidly and
does not stop.
Failed motor control
board (MCB).
Replace MCB.
Erratic speeds - Running
belt speed is not stable.
Machine not calibrated
properly.
-Run auto calibration.
Reference Eng. Mode
p44.
If unit fails to auto
calibrate, refer to auto
calibration
troubleshooting.
Reference p48.
Inadequate power. -Check for dedicated
circuit (20 amp is ideal)
and check wall outlet
voltage (120 VAC).
Reference p25.
-Make sure machine is
not on extension cord,
surge protector or GFCI
circuit.
If the AC voltage is
missing or incorrect,
check the AC service or
consult an electrician.
Failed or improper wiring. -Verify there are no
pinches or cuts in the
power cord, power wires,
motor wires, or console
cable.
-Verify the connections of
above wires and cords.
Replace parts as needed.
-Running belt is too loose
or too tight.
-Drive belt is too loose or
too tight.
-The running belt should
not slip at all when
customer is using the
machine. Reference Belt
Tensioning p19.
-The drive belt should
have approximately 3/8 of
inch deection.
Set proper drive belt and
running belt tension.