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Solved Thermistor on heated bed is open

Discussion in 'Troubleshooting' started by milw, Jul 21, 2017.

  1. milw

    milw New Member

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    hi, I bought a used original Robo 3D ( a modded kickstarter one), and had the heated bed working nicely with PLA. But during a long print when I also suffered a broken filament, the bed temp sensor started showing just zero degrees; when I move the nozzle sensor onto those pins, it reads OK so its not the controller board. I took the bed off, and the thermistor is reading as an open circuit (while the heater is showing 1.5 Ohm). Is it possible to replace the thermistor only? I didn't want to remove the insulation/kapton tape unless this seems doable.
    Thanks for your help!!
     
  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Sure. Not sure what thermistor type it is... but we can review the firmware. Fairly standard 100k thermistor.

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  3. milw

    milw New Member

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    I'm running MC on Mac OSX, is there a firmware reading command?
     
  4. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    I dont have the link handy but robo has the firmware source. Staged.

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  5. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    I can get the link in a while if someone else doesnt post it

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  6. milw

    milw New Member

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    Well, MC reports it as RoBo 3D R1 V5 if that's helpful.
     
  7. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    That is not the thermistor type. Someone will need to look at the firmware source.

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  8. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Thermistors are cheap at least

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  9. milw

    milw New Member

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    Yup. Broken lead right where it was taped to the bed. I had played with some smaller heater elements on a different printer, but they had the RTD integrated and under some epoxy. This is super simple to replace by contrast.


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  10. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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  11. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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  12. milw

    milw New Member

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    Awesome, thanks!


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