Troubleshooting temperature readings

SystemSystem Posts: 13Administrator
This discussion was created from comments split from: Review: JGMaker Magic 3D Printer.
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  • mayalyonsmayalyons Posts: 15Member
    I bought the JGmaker.. Magic 3D printer.  It was working fine then I was having problems getting it to print anything but the sample. Then while trying to fix that the screen on the printer is just blue with no words on it. Could use some help...
  • Samuel PinchesSamuel Pinches Posts: 2,261Administrator
    Ok... try unplugging mains power and connecting to a computer. Can you connect to it via USB cable in pronterface/printrun?
  • mayalyonsmayalyons Posts: 15Member
    This is what it tells me. 
  • mayalyonsmayalyons Posts: 15Member
    I was told my firmware is bad but haven't been able to find a new one to redownload it.
  • Samuel PinchesSamuel Pinches Posts: 2,261Administrator
    What baud rate are you using? (Top left corner of the window... try 250000, or try the other options if that doesnt work...
  • mayalyonsmayalyons Posts: 15Member
    That did something 
  • mayalyonsmayalyons Posts: 15Member
    What's a M999
  • Samuel PinchesSamuel Pinches Posts: 2,261Administrator
    Bingo. Sound like there is a fault with one of the temperature sensors. In pronterface you can press reset and then it should give you a full output including the specific error.
  • Samuel PinchesSamuel Pinches Posts: 2,261Administrator
    edited June 2019
    Just under that output log is a input command box - You could try type M999 in there and press enter. But you might need to just use the reset button at the top of the window.
    Post edited by Samuel Pinches on
  • mayalyonsmayalyons Posts: 15Member
    I did do a reset but it still gives me the same thing.
  • Samuel PinchesSamuel Pinches Posts: 2,261Administrator
    No error like MAXTEMP or MINTEMP?
  • Samuel PinchesSamuel Pinches Posts: 2,261Administrator
    edited June 2019
    Bingo - MAXTEMP error on Extruder. That means the extruder thermistor wires (temperature sensor) are short circuited. Try unplug all the cables at the print head, and restart the printer. The error should go away, temporarily. That would mean that the short circuit is inside the print head area.
    Post edited by Samuel Pinches on
  • mayalyonsmayalyons Posts: 15Member
    Ok I'll try that, thanks
  • mayalyonsmayalyons Posts: 15Member
    It's still doing the same thing
  • Samuel PinchesSamuel Pinches Posts: 2,261Administrator
    When you unplug it might change to a MINTEMP error instead of a MAXTEMP, so just watch out for that. Otherwise, try unplug the T_ext plug on the motherboard, and see what error you get.
  • mayalyonsmayalyons Posts: 15Member

  • mayalyonsmayalyons Posts: 15Member
    This is what it is at now. I don't see where to change that.
  • mayalyonsmayalyons Posts: 15Member
    I had unplugged everything and replugged it.
  • Samuel PinchesSamuel Pinches Posts: 2,261Administrator
    Ok, I don't understand... it looks like the bed sensor is unplugged (showing zero??) and the extruder is showing 55C? Sounds like a possible motherboard fault?
  • Samuel PinchesSamuel Pinches Posts: 2,261Administrator
    If you try swapping the T_ext and T_bed sensor plugs on the motherboard, what happens?
  • mayalyonsmayalyons Posts: 15Member
    I'll try that and let you know
  • mayalyonsmayalyons Posts: 15Member
    This is the motherboard I have and I don't see what you are talking about on it.
  • Samuel PinchesSamuel Pinches Posts: 2,261Administrator
    Oh, sorry, it looks different to what I was expecting. :disappointed: Sorry!
  • mayalyonsmayalyons Posts: 15Member
    It's ok we tried
  • Samuel PinchesSamuel Pinches Posts: 2,261Administrator
    @mayalyons I think its pretty likely that this is a motherboard malfunction, but I had another thought - you can check the thermistor sensor with a multimeter. It should read around 100k ohms at room temperature. This could be one way to confirm it is a motherboard issue.
  • IvanzgIvanzg Posts: 4Member
    JgAurora Magic termistor temp. 
    Hello, I'm having problems with my Jg Aurora Magic.  The thermistor temperature drops.  I set it to 230 *, after a short time the temperature starts to drop, then the printer prints a classic error on the screen, I checked the thermistor and it is correct.  Do you have an idea what might be?  The printer is 2 months old.
  • Samuel PinchesSamuel Pinches Posts: 2,261Administrator
    Welcome @Ivanzg , what specific error do you see?
  • Samuel PinchesSamuel Pinches Posts: 2,261Administrator
    Is the room you are printing in cold?
  • IvanzgIvanzg Posts: 4Member

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