No voltage at coolant pin ?

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  • August 5, 2014 at 10:51 pm #6584
    3D-Welder
    Member

    I’m having a problem with the v8 board …
    The coolant pin is not outputting a voltage when M7, M8 or M9 command is given.
    SDir pin is dead as well (no voltage)
    Spin pin does output 3 volts with M3 / M5 commands
    everything else on the board is working fine
    the build is 380.05 ver .96

    any ideas or suggestions ?

    Thanks kindly
    Steve

    August 5, 2014 at 11:21 pm #6586
    alden
    Member

    If it’s a board problem please return the board for replacement or repair. Contact Synthetos at gmail dot com.

    August 5, 2014 at 11:43 pm #6587
    3D-Welder
    Member

    Alden
    should I assume it’s a board problem not a firmware issue ?
    is there a problem solving path I should try for the firmware ?

    Thanks
    Steve

    August 6, 2014 at 6:13 am #6591
    alden
    Member

    I don’t think it’s the firmware. It might be good to update to the latest edge and try again just to rule that out. But 380.xx has been running those commands for a long time and this is the first we’ve heard of this issue.

    Cycling M3, M4, M5 should switch the spindle direction bit on and off. Cycling M7, Mp should turn the coolant on and off. You can also see if the processor pin is turning on. THe schematics are on the github.

    August 6, 2014 at 5:50 pm #6598
    3D-Welder
    Member

    further troubleshooting
    I found and download the TinyG schematic v8h and the pinout/block diagram for the XMEGA A3 chip
    By the schematic it is a direct path from the coolant back to pin # 36 on the chip
    3.4v is present at the chip yet not at the coolant pin ???
    Cycling M7 / M9 does not alter the voltage at the chip. It is always 3.4v
    The LED indicating coolant on / off does light properly.
    The LED indicating spin direction also lights properly.

    see the project here :
    http://molten3d.blogspot.com/

    • This reply was modified 11 years, 7 months ago by 3D-Welder.
    • This reply was modified 11 years, 7 months ago by 3D-Welder.
    August 6, 2014 at 9:20 pm #6601
    3D-Welder
    Member

    ​
    Oh man am I embarrassed.
    I’ve been checking for voltage by probing the top of the terminal screw with no wire attached.
    While out for a walk it occurred to me to install a short length of wire to attach the V meter to.
    Proper voltage is at the coolant pin, the device I’m try to control will turn on / off.
    It seems odd that the top of the metal screw has no conductivity without pinching a wire but that’s exactly the problem.
    Please accept my sincerest apologies.

    August 6, 2014 at 10:37 pm #6602
    alden
    Member

    No problem there. I’ll get this on the wiki as well. Good to know about those pesky screws.

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