Geetech A20M (GT2560 V3 board) with PT100/amplifier help

Discussion in 'Troubleshooting' started by Josh Cook, Sep 4, 2020.

  1. Josh Cook

    Josh Cook Member

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    Looking for any assistance with the TP100 sensor and amplifier board from E3D on a GT2560 V3 board in the Marlin V2 firmware for a Geetech A20M printer. I will give as much information as I can since I have been pulling my hair out for weeks trying to get these to work.


    Firmware:

    BOARD_GT2560_V3_A20 being used.
    https://i.imgur.com/s9x8Nig.png
    [​IMG]

    Navigated to “Marlin-2.0.x\Marlin\src\pins\mega” and opened “pins_GT2560_V3_A20” which also included “pins_GT2560_V3” so I opened that as well. Located and defined my analog pins as 0 and 1 in "pins_GT2560_V3"
    https://i.imgur.com/8qlIe5p.png
    https://i.imgur.com/5W6c7SO.png
    [​IMG]
    [​IMG]

    Set my sensors as “20” per the documentation and compiled/uploaded the code with no errors.
    https://i.imgur.com/kgae43Y.png
    [​IMG]

    Hardware:
    PT100 sensors reading just above 100 Ω per the documentation.
    https://i.imgur.com/THUNdZp.png
    https://i.imgur.com/OUvSQOo.png
    [​IMG]
    [​IMG]

    Using the Y and Z endstops for power for now, I will move this to a different source later but they are both providing 4.99V DC, the documentation says provide 5V DC I don’t think .01 of a volt would causes issues. This is with it unplugged from signal and the amplifier boards.
    https://i.imgur.com/b0UWeJ9.png
    https://i.imgur.com/C4rD08x.png
    [​IMG]
    [​IMG]

    Voltage top, signal middle, and ground bot.
    https://i.imgur.com/EoJRLhO.png
    [​IMG]

    Signal pins on analog pin 0 and 1 as notated in the firmware.
    https://i.imgur.com/uNHRNZj.png
    [​IMG]

    Sensors plugged into to amplifier boards and power turned on resulting in an immediate “Max temp error”. I have checked all the wires going from the board and signal pins to the amplifier for continuity and they all check out. I honestly do not know where to go next, any help would be greatly appreciated.
    https://i.imgur.com/25lZCuu.png
    [​IMG]
     
    #1 Josh Cook, Sep 4, 2020
    Last edited: Sep 4, 2020
  2. Josh Cook

    Josh Cook Member

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    For anyone that bumps into this, all my wiring and setup is correct. The cause of the issue was defective thermocouples that were crimped poorly causing a random loss in connection.
     

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