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Stairmaster 4000pt console shuts off before 2 minute rest

When I work out the machine works great. If I stop climbing to rest sometimes the console restarts and sometimes it keeps the program going for the two minute rest stop. What would be causing this? I replaced the alt brushes and no change. It has always done this. I just keep moving the pedals when I rest so it doesn't start all over again.

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How do I test for continuity of the gray cable on my Stairmaster 4000PT?

Testing for Continuity of the Gray Cable on a Stairmaster 4000PT
  1. First disconnect the grey cable from the back of the console and UNPLUG YOUR MACHINE from the wall.
  2. If your cable has a 6-pin round connector, you will need to check pin sockets #5 (black wire), #3 (blue wire), #2 (brown wire) and #4 (white wire) with your ohmmeter for continuity in each pin. Should get continuity from all if cable is good.
If your cable is a 9-pin cable, you will need to check pin sockets #5 (blue wire), #3 (black wire), #2 (brown wire) and #4 (white wire) with your ohmmeter for continuity in each pin. Should get continuity from all if cable is good.

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Preform this test if you are having trouble entering data into the console. If you cannot enter the DIAGNOSTIC code due to an inoperable keypad, replace the console.
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  2. The display LEDs will light up in an L-shaped formation, representing the keypad matrix. Pressing a button on either the exercise program keypad or the function keypad will light an LED within the outline on the display that corresponds to that button's position on the console.
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This really still sounds like a console issue. You can check your load resistor just to make sure that is not causing an issue. It should be labeled as to what ohms it is rated as. Simply unhook it and, using a multi-meter, check the ohms. It should be +or- 10%. I am attaching a link to a video on how to use a multi-meter just in case.

Video about Multimeter Testing

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Replacement Parts for Fitness Exercise Equipment at SPORTSMITH

Check continuity of the console cable. If this checks out, open the console and look for any corrosion on the circuit board. If this seems to be the issue, you will have to find someone to repair the circuit board as they are no longer available.

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The following test will help to determine if the cause of no resistance on your Stairmaster 4000PT stepper is the console. By performing the following test, the console is eliminated from the electrical circuit. If resistance is present when the test is performed, the console is bad. Paper Clip Trick
  1. First UNPLUG YOUR MACHINE from the wall, then disconnect the grey cable from the back of the console.
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