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How do I fix a Proform 770 EKG treadmill?

Model #831291660. It slows and stops when on it and resumes speed when you get off. Also, the motor sparks only at high rpms.

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Treadmills
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3 Answers from these members:
Manage My Life
Trying calibrating the speed on your machine. You can watch

THIS VIDEO

to see the procedure for this.

Also, you may try checking the walking belt tension as well as the drive belt tension. You can watch

THIS VIDEO

to see the procedure for the walking belt tension adjustments.

If neither of these situations seems to correct the problem then it's most likely going to be the controller failing on your machine. You can check the motor with a volt meter to see if it's failing but I have a feeling it's fine. To check the motor: Remove the red and black power leads from the motor at the controller. Then connect the meter to those leads (meter connected to motor). Set the meter to read DC voltage. Put the safety key in place and then walk on the treadmill (manually, do not press any keys) up to 3mph. At 3mph the meter should read 28VDC or more. If it's less than that the motor has failed. If the voltage is 28VDC or better then the motor is fine and just the controller will be the issue. If the motor does check out bad, I would replace the motor and controller as a set.

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by Manage My Life
February 2nd, 2012
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Manage My Life
Does the belt seem loose? I've been playing with mine because I'm having issues with it tripping the breaker, but what you are saying may just be the belt. Are you familiar with tightening and loosening the belt?
by Manage My Life
January 31st, 2012
Answered in 10 minutes
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Joseph Perez
I know how important it is to have a good working treadmill in the home so that you can get a good workout to feel great. I am adding two links below to help you with your question while you wait for your expert response.
by Joseph Perez Earned 1,551 community points in Treadmills
January 31st, 2012
Answered in 6 minutes
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