Sportcraft tx 350 treadmill that will not stay on one speed.. what has gone wrong?

SOURCE: Have a sportcraft tx350 treadmill and it won't

I have a TX350 sportcraft treadmill and I keep getting shocked when I use it. How can I stop it ? I no longer have the user manual for it either. Can I get one ?

SOURCE: location of speed sensor for sportcraft tx 400 treadmill

Look for 2 small wires molded together that come from the vicinity of the front roller, or the front of the motor. Those are the wires to the sensor. They may be routed under the frame and may only visible when the bottom panel is removed.

SOURCE: location of speed sensor on sportcraft tx 400 treadmills

It is a simple magnet and Hall effect transistor if you have 2 small wires. It usually attaches to the 1/8 inch mini plug. You can test it with an analog meter, the resistance will be stable at rest, and with treadmill in motion, the resistance will change as the magnet passes the hall effect switch. moving the track at slow speed manually will be enough to see the needle move. Speed is calculated off of the rate of those pulses.