Question about Sole Fitness F63 Treadmill

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How do I fix a sole F63 treadmill that accelerates to maximum speed after about 30 minutes of use?

My wife has a SOLE F63 treadmill that has been working fine for the last eight years. But lately it is misbehaving. After about 30 minutes of normal use it will start to accelerate on its own to higher and higher speeds until it stops. When it stops the display shows LS and Low speed. While it is accelerating the display does not change the speed reading, but shows the speed that was set by the user. I have tried all maintenance I could, including: speed sensor adjustment, motor brush cleaning, connector checking and tightening, belt adjustmente, lubrication and self-calibraion. Unfortunately nothing worked. I am suspicious that the problem is related the some compenent overheating. This would explain why the malfunction only appers after about 30 minutes of use. I also suspect the motor thermal protection sensor. I dont'a have a detailed circuit or functional diagram, so my troubleshooting is quite limited. Any help or suggesting will be appreciated.

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Usually the motor will be controlled by a triac its a silicon device you apply more volts to a pin to allow more current to flow thru it
between its two other pins
so its used to control the motor speed

its more likely its a problem before the triac
a 'driver' device
i would take the control board out and examine it carefully for any blackened devices

so to rule out this drive chain i would take the board to a service tech like a TV repair guy and ask him to cast his eye over it
i usually get a few beers from people to do this as a bribe
always works for me and you would be surprised
you could take a photo or two as jpg in macro mode of the board
component side and post them and i can cast my eyes over them for free..

Posted on Apr 19, 2015


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