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Greger

MCM4 Motor Problem?

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My Gotway MCM4 is not working any longer. On power on, I get 5 short beeps, and if I manually turn the wheel, it moves in jerks. I would really appreciate any hints on what could be wrong and how to fix it!

Short background: I was standing still on the wheel (power on, holding on to a fence), when I got a cracking sound and the behavior described above.

 

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First i will try to test hall sensors in motor, plug in voltage 3v - 5v and chceck hall sensors output. If any hall sensor will be broken you need to have some skills to change broken part.

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That cracking sound could be a burnt mosfet, also.

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Question: would really the hall sensors affect the wheel when it’s not powered up? If I roll the wheel when turned off, it sort of moves between set positions.

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45 minutes ago, Greger said:

Question: would really the hall sensors affect the wheel when it’s not powered up? If I roll the wheel when turned off, it sort of moves between set positions.

That symptom means that two or three of the motor wires are shorted together. Classic symptom of a fried control board.

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If mosfets are burned (short circuit) you will have resistance when you try to spin motor, resistance will gone when you disconnect motor coil wires.

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Ah ok, thanks! Do you know if it is possible to get hold of and replace a new control board? I am located in Sweden.

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OK, found one here, I think: https://www.aliexpress.com/item/32832739505.html?spm=2114.12057483.0.0.54a4d0f5wnrZdn

Any way other than visual inspection I can check if it really is the control board? Spending $140+ without being sure is kind of pricey :)

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