RAMPS board - no power to heatbed

  • I'm setting up my first 3D Printer, a Prusa i3 MK2 clone.
    When I try to heat the bed, nothing happens. Then Marlin throws this error after a while:



    Bed Heating Failed
    PRINTER HALTED
    Please reset


    In Pronterface I see this in the console:



    Error:Heating failed, system stopped! Heater_ID: bed
    [ERROR] Error:Heating failed, system stopped! Heater_ID: bed

    Error:Printer halted. kill() called!
    [ERROR] Error:Printer halted. kill() called!


    There is 0 voltage across D8 on the Ramps board, where it is connected. When I heat up the hotend, on the other hand, which is connected to D10, I see 12V across the board's D10 terminals.



    The bed is MK42 type.



    My axes, extruder hotend and fans are working OK.



    I previously burned out the 5 V regulator on my Arduino Mega by misconnecting one of the end stops. I replaced the regulator on the board and the 5 V supply seems to be working OK again. However I wondered if I might have damaged the board in some other respect? Or is there a config setting in Marlin I should change?


  • Lemmy

    Lemmy Correct answer

    3 years ago

    The problem was that one of the pins on the Ramps board power supply header was not soldered. The manufacturer had omitted to solder one of the pins, so there was no power to D8. Fixed by soldering the pin in place.


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Content dated before 7/24/2021 11:53 AM