Troubleshooting No Resistance on Nautilus SM916 Stepmill

This article covers the electronic troubleshooting for a complaint of No Resistance on the Nautilus SM916 stepmill.

Tools Needed:

• Multi Meter
• Assistant for Testing Purposes

It is necessary to begin by removing the user's right side cover to gain access to the lower control board and alternator for testing purposes.

• Using your multi meter on the volts setting, you will place your black meter lead to the Ground test point on the lower board and place your red meter lead into the back of the cable connector where the brown wire is located. Have your assistant step onto the steps. Voltage should be present. If no voltage is present, check all cables. If cables check out, the console should be replaced. If voltage was present, it is time to move to the next test point.
• Place your black meter lead to the Ground test point and the red meter lead to the Tach test point. Have your assistant step onto the steps. Voltage should be present. If no voltage is present, the alternator brushes should be replaced. If voltage was present, it is time to move to the next test point.
• The next component to test for a no resistance issue is the load resistor. You will be testing for .5 -.7 ohms. Place the red meter lead to the white wire connected to the load resistor and the black meter lead to the black wire. If the proper value is not found when the load resistor is tested, it should be replaced.

You have now tested the entire electrical circuit. If the problem still exists, you have a mechanical failure or you should verify the results of your testing.