Tip & How-To about Stairmaster Stepmill 7000 Pt

Too Much Resistance on Stepmill

The first step in troubleshooting too much resistance or constant resistance begins with the lower board. You will want to first verify that the Field LED is lit on the lower board. As shown in the video, the Field LED is off initially, when the steps are engaged it lights up, after about 5 seconds the light should go off. If the Field LED stays lit during a workout or after a workout is completed, this is a sign that the console is faulty. There is constant power being supplied through the console keeping a full load and causing no change in resistance. If the Field LED remains lit, the console needs replaced.



Too Much Resistance Troubleshooting Video for Stairmaster Stepmill SM916

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There is no change in resistance when programmed at console


Replacement Parts for Fitness Exercise Equipment at SPORTSMITH

This video covers general resistance troubleshooting for the Stairmaster 4400CL, 4600CL, and SC916 Steppers.
Tools Needed: Multi Meter, Jumper Wire
Resistance problems could be either mechanical or electrical in nature.
Mechanical problems are easily identified by noise. If a grinding noise is heard while pedaling, this is an indicator the drive hub assembly is having a problem. If a ratcheting sound is heard while pedaling, this is an indicator of a loose belt or a belt that could be coming off.
Once you've eliminated the possible mechanical causes for resistance problems, then it is time to investigate the electrical system.
The easiest test of the electrical system when investigating a resistance problem is to step onto the pedals and access Diagnostics. This is done by pressing Level ^, 6, ENTER. (DIAGNOSTICS will appear in the upper display window.) Press Level Down twice to get to the alternator test. (ALT TEST will appear in the upper display window.) Press ENTER to begin the test. As the video shows, resistance drops out when the test begins. So, if this occurs, press the Level ^ one time. This will turn the field ON. This verifies that voltage is passing from the display through the display cable to the lower control board. This confirms there is good communication between the console and the lower control board and that the voltage is being supplied to the alternator. If resistance is lost during this portion of the test, inspecting the cable should be the first step of action. Look for bent pins, loose connection or crimped wire.
Other components of the electrical system to inspect for resistance problems are the battery, load resistor, speed sensor and alternator.
We'll discuss the battery first. In order to get a proper reading, testing the battery should be done with the pedals in motion. There are 3 different battery readings a person may encounter. A reading of 6 VDC or greater indicates a good battery. A reading below 6 VDC but higher than 4.8 VDC indicates the battery needs charged for 24 hours. A reading below 4.8 VDC indicates your battery is bad and needs replaced. For more information, watch our battery testing video.
If your battery is good, the next item to check is the speed sensor. The speed sensor should be spaced a business card thickness away from the speed disc. If the speed sensor is spaced properly, the function of the speed sensor can be verified by confirming that proper voltage is present. For more speed sensor troubleshooting, watch our video on speed sensor testing and adjustment.
Next to inspect is the load resistor. Load resistor testing is pretty simple. Load resistors are ohm rated, and you want to verify the proper ohms for the load resistor being tested. Load resistors can cause the resistance to come and go. This means you may pedal a few steps and then the pedals will drop or loose resistance. Then, as the load resistor cools down a bit, you may get resistance again for a few steps. If the resistance goes back and forth like this, the load resistor likely needs replaced. For more information, see our load resistor testing video.
The last electrical component to inspect when investigating a resistance problem is the alternator. The alternator can be easily tested by performing the B+ to Field jumper test. For details on how to perform this test, watch our alternator testing video.

Resistance Troubleshooting Video for Stairmaster Stepper 4400CL 4600CL...

Sep 09, 2015 | Stairmaster 4600 Cl Cordless Freeclimber

1 Answer

level starts at 19


About This Video

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.

Jan 02, 2014 | 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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