Question about Quantum Fitness Q 3.0 Light Commercial Treadmill

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Loss of speed signal

When i power up treadmill I get a loss of speed signal. Treadmill belt will not move. Everything else seems to work fine.

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  • Quantum Fitness Master
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Dear Sir:

Use the calibration software for easy diagnose and troubleshooting.
Most of them is coming from under the Hood of the motor for instruction follow the steps, or use your user manual.

Adjust the speed sensor see the diagrama, and tight the wires from the sensor.
loss of speed signal - 2_17_2012_12_19_32_am.gifsincerely. God bless you.

ernesto cuadra
managua, nicaragua. c.a.

Posted on Feb 17, 2012

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Posted on Jan 02, 2017

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1 Answer

Why does it say loss of speed signal


As you have not provided the make and model of the treadmill I can only suggest the cause is usually a loss of signal from the motor drive to the display unit.

To fully diagnose the problem I will refer you to page 24 of this service manual for a treadmill that explains the problem.
Not sure if your treadmill is similar. http://www.landice.com/sites/default/files/L-60_L8622SeriesDiagnosticAddendum.pdf

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Seem like your front roller bearings are knocking. Remove the drive belt. Turn machine on. Replace roller if noise goes away with drive belt off.

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Treadmill not working


Belt speed Loss:

This condition indicates that the speed pickup signal was lost continuosly by during 1 second after the motor successfuly started.Normally indicate a failure of speed pickup or abrupt belt stoppage to due any motor, wiring,or motor controller failure.

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1 Answer

Why does treadmill keep blowing plug fuse as soon as you start to us it.


Dear Sir:

Hello, I hope everything is fine, in union with your family.

I will try to help you, inmediately.

INSTRUCTIONS: You must be carefully to do this.
    • 1
Cleanand routinely maintain the running belt. The belt may be worn if the treadmillstops operating or trips the circuit breaker or fuse. Look for any tears in the belt.Test the belt by putting the treadmill at full incline. If it does not shutoff, you may need to replace the belt. You can try lubricating it first, butthe safest fix is simply to replace it.
    • 2
Tightenthe running belt if it is loose. A belt can slip if there is too much friction.Be careful not to tighten the belt too much, though. You should be able to liftthe belt at least 3 inches.
    • 3
Pushthe belt in the direction that it normally turns. Turn off the power before youstart. If the belt is difficult to turn, there is high belt/deck friction.However, if the belt moves freely, that's not the problem.
    • 4
Examinethe roller sleeve to see if it is centered on the running belt. If not, this couldcause the belt to move to one side. Often a common problem with treadmills, youcan try making adjustments yourself, but eventually you may need to replace thesleeve or roller.
    • 5
Stopthe treadmill and immediately unplug the power cord from the outlet if younotice a burning smell. Overheating could be a sign that there is too muchfriction or a short in the wiring. Examine the belt and deck for any signs ofwearing. If they check out alright, inspect the wiring. Replace any damagedparts as needed.
    • 6
Checkto make sure that the power switch is on if you suddenly lose power. If thisisn't the cause of the power loss, unplug the treadmill from the wall outletand individually test the fuses, breakers and switches. Test the wall outletfirst, as a fuse may have blown or a circuit breaker tripped.
    • 7
Allowthe treadmill to run at a speed of 2.5 mph without anyone walking on it if younotice fluctuations in the speed. The speed should be constant. If not, therecould be a problem with the motor.
    • 8
Testthe motor using a fully charged lantern battery. The motor should still operateat slow speed.
    • 9
Replacethe batteries in the panel if it dims. If the batteries aren't the problem,check to see that all the wiring is still intact. Sometimes a wire pulls loose.
Thank you in advance, sincerely. God bless you.
If you need further assistance, please reach me.
E.CUADRA MANAGUA, NICARAGUA. C.A.

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2 Answers

My sportsart 6150 treadmill gives an error code 1 when the speed button is pushed. motor moves slightly but then gives error code 1. thanks.


I would say that it could possibly be a speed densor fault as error one means loss of speed signal!! If the mat moves first then error one shows i would change sensor before changing anything else, if the mat does not move it could be a lower control board fault.

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2 Answers

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Double check all your connection. Check to see if you may have pinched any wires. Also check to see if you have accidently unplugged or pulled a wire loose. If that's not the case it sounds like a lower board issue.

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2 Answers

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If everything on the display console is working correctly then we know it is either a problem with the wires from the console to the controller or the controller itself. In most cases this means you need a new controller. To verify, take off the motor hood and find the green circuit board called the motor controller. With the power on go into manual mode and push the speed up button to a slow speed. If you see an LED light with "spd ctrl" next to it flickering but the belt still does not move then we know the problem is with the controller sending the signal to the walking belt, in which you should check the wires that go to the motor. If they are connected correctly then we know a new controller is in order. If you do not see a flickering light then it means the speed signal never got there and the problem will be with the wires going from the console to the controller. This is called an upright wire harness.

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3 Answers

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tHIS MAY BE A SPEED LOSS ERROR. Is the belt moving when this happens? Decribe what lead to this problem in the first place that will help me to better assist you.

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2 Answers

Treadmill will not maintain the correct speed.


You can get a book by calling 1-800-999-3756. The treadmill you are usine in a cheaper model. the motors on those units are not that strong. when you incline your unit gravity make the belt move faster. Remember incline put a lot of pressure on you lower spine. This can cause injury for some.

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