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Thread: Testing 2560 board

  1. #13
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    Default Re: Testing 2560 board

    It looks like you have your extruder driver drv8825 board plugged in backwards.



  2. #14
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    Quote Originally Posted by george4657 View Post
    It looks like you have your extruder driver drv8825 board plugged in backwards.
    I did plug it in with the regulator in the same position, that is not correct?



  3. #15
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    Default

    like this pic does that help?

    Attached Thumbnails Attached Thumbnails Testing 2560 board-img_6999-jpg  


  4. #16
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    Default Re: Testing 2560 board

    If you look at his page http://www.geeetech.com/wiki/index.php/GT2560
    You will see that the adjustment for current setting of the drv8825 is at the oppsite to a4988 drivers.



  5. #17
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    Default Re: Testing 2560 board

    hmm I see said the blind man...

    That is a great page, lots of good info.
    Thank you for the pointer, I will report the results, that is if I have not fried something.

    I have in fact, looked at replacing my board with that very gt2560 board, it looks quite nice.

    Thank you



  6. #18
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    Default Re: Testing 2560 board

    10 min later...
    Ok so unit is unplugged
    flip the driver over...
    plug in and power up...
    and ... no change, the extruder is not moving. All other axis function as they should.

    So I think, well maybe I fried the driver. I have another! So, depower and unplug. Remove the 1st replacement and install #2 (correctly!).
    And... nope it doesn't work either. This time the rest of the axis decide they don't want to play either. No movement, the motors are making noise like they want to move but are not.

    This is what it does to me with no warning.....

    ARGH! What is going on?

    oh Thank you again for taking the time to read and make suggestions



  7. #19
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    Default Re: Testing 2560 board

    Rover31,

    The part in the last picture is a STMicroelectronics P55NF06L, which is a 55 Amp Power MosFet. This part probably is used to provide the current to the heater in the extruder would be my guess. I can't see the writing on the other two parts that is probably the regulators. If you can get a small mirror and write down those part numbers I can find out. Since you reverse a driver on the control board you probably damaged something on the control board would be my guess. However, if this stopped working before you touched the inside and does the same behavior after you went inside you might not have caused the damage by reversing the board.

    Russ



  8. #20
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    Default Re: Testing 2560 board

    After looking at the website that George4657 posted the link to, the three parts with Aluminum heat sinks are all Power MosFets, one controls the current to the Hot Bed, Extruder Heater#1, Extruder#2

    None of these parts are voltage regulators. Most likely the regulators are not bad or the other stepper motors would never move.

    Russ



  9. #21
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    Default Re: Testing 2560 board

    The website also confirms if you plug in a driver board backward it will cause damage to the main board.

    A4988 should also be connected to the right port, mismatches and revered directions can cause damage to the main board.

    Russ



  10. #22
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    Default Re: Testing 2560 board

    Russ
    Thank you very much for your time!

    I will be ordering a new board today.
    It is odd how this started and ended I am sure that I complecated it.

    Unless one of you experts chimes in I am going to order a gt2560 mega board. Especially given the excellent page posted earlier.

    Thank you and I will try to report back when fixed.



  11. #23
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    Default Re: Testing 2560 board

    Rover31,
    I am pretty sure that will fix your issue. It appears looking at the gt2560 board that the step and direction signals come directly from the MEGA cpu chip. Many designs these type signals are buffer through another chip but I do not see anything in the photos, so that is most likely your issue. Reversing the driver board probably sent the driver voltage back into the MEGA chip with burned those output transistors on those ports.

    Russ



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Testing 2560 board
Testing 2560 board