Tip & How-To about Stairmaster SM 916 StepMill

How to Test the Relay Board on Stairmaster SM916 Stepmill

How to Test the Relay Board on a Stairmaster SM916 Stepmill Disconnect power from the machine.
Disconnect the main cable from the relay board J1 terminal. Main cable should remain disconnected for the duration of the relay board tests.
With the Power ON, place a jumper wire across the GND/BLK and RLY/RED test points. (Ensure jumper wire only makes contact with the designated test points.)

  • Verify that the Relay LED is lit. Remove jumper wire.
With the Power ON, place jumper wire across the +/WHT and FLD/BRN test points. (Ensure jumper wire only makes contact with the designated test points.)
  • Verify that the Field LED is lit. Remove jumper wire.
With the Power ON, place jumper wire across the +/WHT and with the other end touch the ALT/C, FLD/NC, and RES/NO.
  • Verify that the Field LED lights.
If any of these jumps fail, replace the relay board and or power supply.


Stairmaster SM916 Stepmill Relay Board Testing

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1 Answer

On idle machine -- power and field lights are lit, relay is NOT (relay board)


With everything that you have tested and the relay board testing okay, this sounds like the console is the problem.

Jan 02, 2014 | Stairmaster Stepmill 7000 Pt

1 Answer

Stepmill 7000pt is free spinning and has no resistance.


How to Test the Relay Board on Stairmaster 7000PT Stepmill How to Test Relay Board of a Stairmaster Stepmill 7000PT Disconnect power from the machine.
Disconnect the main cable from the relay board J1 terminal. Main cable should remain disconnected for the duration of the relay board tests.
With the Power ON, place a jumper wire across the GND/BLK and RLY/RED test points. (Ensure jumper wire only makes contact with the designated test points.)
  • Verify that the Relay LED is lit. Remove jumper wire.
With the Power ON, place jumper wire across the +/WHT and FLD/BRN test points. (Ensure jumper wire only makes contact with the designated test points.)
  • Verify that the Field LED is lit. Remove jumper wire.
With the Power ON, place jumper wire across the +/WHT and with the other end touch the ALT/C, FLD/NC, and RES/NO.
  • Verify that the Field LED lights.
If any of these jumps fail, replace the relay board and or power supply. Stairmaster Stepmill 7000PT Electronic Testing of Relay Board



The second link will take you to the service manual. Starting on page 13, you will find some more valuable information on the relay board. Last link will take you to a video on how to test the alternator
Video about Performing Jumper Test on Stairmaster Alternator

Mar 12, 2013 | Stairmaster 7000PT Nautilus Stepmill

1 Answer

Stepmill has no resistance when starting


First thing you'll want to do is check the alternator brushes. Here's a link to the different types offered for the Stairmaster 7000PT:


Repair Parts for Stairmaster Equipment Batteries Springs Belts Chains...


If the brushes look like they are in good condition you can also test the relay board. This link will take you to the procedures for checking the relay board:


Stairmaster Stepmill 7000PT Electronic Testing of Relay Board

Nov 06, 2012 | Stairmaster Stepmill 7000 Pt

1 Answer

I have a StepMill 7000 PT that has a problem of gaining speed. It's as though it doesn't have a clutch or brake. Is it the circuit board or alternator? Jerry Whetstone JWhetstone@altoona-iowa.com


This video covers the electronic troubleshooting for a complaint of No Resistance on the Stairmaster Stepmill 916.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 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.
  • 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.


Troubleshooting Video for No Resistance on Stairmaster Stepmill SM916

Nov 02, 2010 | Stairmaster Stepmill 7000 Pt

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