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  1. #1
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    Default no axis movement

    I have not gotten much assistance from the hobbycnc website, and am only making things worse trying to fix this on my own. I purchased a 3 axis pro board, and after completing the initial assembly, I had 4.93v at the test point. I completed the rest of the assembly, set the current on all three axis to .42v, and installed the board. Initially, I had very slow movement on the y axis, and none on the other ones. After a few minutes, the motor shut down as if it were going into protect mode. If I turn the board off for a few minutes and turn it back on, it goes for about 5 secs, then shuts down power to the motors again. I removed the board, verified I still had 5v, and checked the current on the axis again. I had .42 to x and y, but now have no voltage at all on the z pad. I am using a 12v pwr supply for testing and have 11.79v on the U6 regulator, and 4.93 on U5 and U7. I also have continuity on all three posts of the z axis pot. I have also verified everything is oriented correctly, and all solder joints appear solid with no bridges. I also now only have 0.006v on the y axis. I do still have .42v on the x axis. Thanks for any help, Scott.

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  2. #2
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    Default Re: no axis movement

    It appears the two pins that send signal to the pots for my y and z axis are shorted together. It is not that way on my x axis that still works. What would cause this to short together. Surely I haven't fried the driver chips that easily.



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    Default Re: no axis movement

    Quote Originally Posted by scottmcgraw View Post
    It appears the two pins that send signal to the pots for my y and z axis are shorted together. It is not that way on my x axis that still works. What would cause this to short together. Surely I haven't fried the driver chips that easily.
    That's impossible to answer unless we can actually repair your machine. Many things can cause a short circuit and without actually following the signals it is not possible to say why.

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