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  1. #121
    Just measured my motors which are the 76 mm type and they measure 77.6mm so I still think you have the 57BYGH51-602A type.

    Your waveforms look strange to me. The voltage across the current sense resistors should go between 0.5 V and - 0.5 V at 100% torque or 0.375 V at your 75% setting. Is the earth on your oscilloscope properly isolated from the board? If I remember rightly the isolators on these boards only isolate the signal lines not the earth. Are all three outputs the same?

    Russell.

  2. #122
    Doh - I think I must have had a senior moment last night! I was assuming that the current sense resistors were in series with the motor but of course they are the other side of the output bridge so the current is unidirectional there thus it should be going from 0 to 0.375 V.

    Still the waveforms don't look right to me. I can't check on my board as I no longer have access to an oscilloscope but according to the data sheet the motor current waveforms should look like this:
    Click image for larger version. 

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    The waveform across the current sense resistors will of course be rectified.

    Hope that helps.

    Russell.
    Last edited by russell; 16-06-2012 at 10:08 AM.

  3. #123
    Anyone trouble-shooting this module might find this and the hyperlinks shown there of some utility. http://www.drkfs.net/REVERSESTEPPER.htm

  4. #124
    Lovi's Avatar
    Lives in Debrecen, Hungary. Last Activity: 26-01-2013 Has been a member for 3-4 years. Has a total post count of 3.
    Hi everyone!
    I just made a video of the Chinese fake TBA 6560 IC's.
    If your order came from china, better to check them, before powering on.



  5. #125
    I don't know where you found this information but according to the Toshiba data sheet pin 10 is power ground and pin 6 is signal ground so is not necessarily low impedance.

    Pins 1, 17 22 are not ground as you suggest but are torque setting input, initial state sensing output, and excitation mode setting input, respectively.

    Russell;

  6. #126
    Lovi's Avatar
    Lives in Debrecen, Hungary. Last Activity: 26-01-2013 Has been a member for 3-4 years. Has a total post count of 3.
    You should watch the video carefully. We are talking about two different IC's in the same case.
    Pins 1, 17 and 22 aren't groun in the real TB6560 but in the fake one. How could it be possible?
    The right one marked as a 6560 ic, but it isn't, it is a 8435.


    Quote Originally Posted by russell View Post
    I don't know where you found this information but according to the Toshiba data sheet pin 10 is power ground and pin 6 is signal ground so is not necessarily low impedance.

    Pins 1, 17 22 are not ground as you suggest but are torque setting input, initial state sensing output, and excitation mode setting input, respectively.

    Russell;

  7. #127
    Ah, so what you are now saying is not that it is a fake IC but that it is an incorrectly marked one. Not the same thing.

    Russell.

  8. #128
    Lovi's Avatar
    Lives in Debrecen, Hungary. Last Activity: 26-01-2013 Has been a member for 3-4 years. Has a total post count of 3.
    Do you really think that such a big and responsible company like Toshiba would sell "incorrectly marked ICs"?
    Why can't we find any incorrectly marked IC at the stores, buy 15 of 20 from the ebay? It's a simple fraud.
    This products should be destroyed in the company. So you think Toshiba made a mistake with tonns of their ICs?

  9. #129
    try www.diycnc.co.uk

    system45 newer driver boards so no more squeeling

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