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Unresolved need help with thermo problem

Discussion in 'Troubleshooting' started by Jordanbanks, Dec 27, 2014.

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  1. Jordanbanks

    Jordanbanks New Member

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    Hello robo3d community I was printing fine a couple hours ago but then my thermostat on the hotend went; so I had a back up thero screw but now it reads 13c even when heating up. If I take out the thermo screw it does not read 0 degrees it still reads 13c degrees plz help???????
     
    #1 Jordanbanks, Dec 27, 2014
  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Sounds like a wire loom issue. Test it by running a new wire pair all the way back to the RAMPS (outside the loom) and if it read correctly then you can dismantle the loom and replace the wire in it. That is a pain.
     
    #2 mark tomlinson, Dec 28, 2014
  3. Jordanbanks

    Jordanbanks New Member

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    so the wireloom around it is the problem? so try taking it out of the wireloom and connecting it? sorry I am new to this part.
     
    #3 Jordanbanks, Dec 28, 2014
  4. Jordanbanks

    Jordanbanks New Member

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    I don't have ant extra wires for this
     
    #4 Jordanbanks, Dec 28, 2014
  5. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Well, there might be a bad wire or connection inside of it.
    But before you invest the labor and time into dismantling it, make sure you have the problem isolated.
    Run a wire pair outside the loom directly to the thermistor and the RAMPS. If it reads correct then dismantle and fix/replace the bad wire in the loom.
     
    #5 mark tomlinson, Dec 28, 2014
  6. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    I had several bad wires in mine (KS robo) and eventually just replaced most of the loom.
    I am not aware that this much failure is common so just deal with the one you know is failing.
     
    #6 mark tomlinson, Dec 28, 2014
  7. Jordanbanks

    Jordanbanks New Member

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    I hope this does not sound stupid but would you know which wire from the ramps is to the thermo for the hotend?

    and thank you very much for helping.
     
    #7 Jordanbanks, Dec 28, 2014
  8. Jordanbanks

    Jordanbanks New Member

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    just to clarify with no thermo it it should read 0 degrees right?
     
    #8 Jordanbanks, Dec 28, 2014
  9. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    T0 is the one for the hotend, T1 i for the heated bed.

    http://reprap.org/wiki/RAMPS_1.4

    Yes, I suspect it will read zero with the thermistor disconnected. You could disconnect the heated bed thermistor at the RAMPS and see what it reads. Or swap T0 and T1 and see if the behavior swaps with it (only for testing, clearly you can't run that way)
     
    #9 mark tomlinson, Dec 28, 2014
  10. Jordanbanks

    Jordanbanks New Member

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    Help I tried fixing it so I bought a new thermo and plug that in before going and finding the wire; when I heated it up the thermo popped out of the hotend. Is my printer heating up hotter then it says? it was showing it heat up.
     
    #10 Jordanbanks, Dec 31, 2014
  11. Jordanbanks

    Jordanbanks New Member

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    When I unplug it it shows 13C and when I plug the bed in the hotend shows 14C even though the bed is 16C? is my ramps dead
     
    #11 Jordanbanks, Dec 31, 2014
  12. Mike Kelly

    Mike Kelly Volunteer

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    Huh? No your ramps seems fine.

    You need to make sure your thermistor is pressed up against whatever it's sensing.
     
    #12 Mike Kelly, Jan 1, 2015
  13. Jordanbanks

    Jordanbanks New Member

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    it is not the thermo because with the thermo out it reads 13C that's with noting plugged in the adrino board it still reads 13C.
     
    #13 Jordanbanks, Jan 1, 2015
  14. Mike Kelly

    Mike Kelly Volunteer

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    If you hold the thermistor does it heat up?
     
    #14 Mike Kelly, Jan 1, 2015
  15. Jordanbanks

    Jordanbanks New Member

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    Yes the thermo shows signs of heating but it is not registering the right temp; with the wire unplugged it should read 0 degrees but it still reads 13 degrees. Does that have to do with the Ramps?
     
    #15 Jordanbanks, Jan 1, 2015
  16. Mike Kelly

    Mike Kelly Volunteer

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    I'm not sure why it matters. It won't necessarily report 0.

    If the thermistor works then it works.
     
    #16 Mike Kelly, Jan 1, 2015
  17. Jordanbanks

    Jordanbanks New Member

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    I don't think u understand me with the hotend thermo not hooked up to the board it reads 13c it should be 0 degrees. This tells me it must be reading wrong right?
     
    #17 Jordanbanks, Jan 1, 2015
  18. Mike Kelly

    Mike Kelly Volunteer

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    I understand you, I'm just trying to tell you that it doesn't matter what it reads when it's unplugged and that your ramps is fine.
     
    #18 Mike Kelly, Jan 1, 2015
  19. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    +1

    If it reads close with the board plugged in and the heater turned on, not much else matters.
    Even is it were 13c off that might not be a crisis. See if it works as expected hooked up.
    When you heat the hotend does it go up?

    Sounds more like you might have picked the incorrect thermistor type in the firmware (when you replaced it) and it is just not calibrated correctly.
     
    #19 mark tomlinson, Jan 1, 2015
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