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Solved Temp shows 230C when stone cold at start up

Discussion in 'Troubleshooting' started by Rigmarol, May 26, 2016.

  1. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    The list of suspects is not huge...
     
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  2. Geof

    Geof Volunteer Moderator
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    Here is to hoping it's a loose connection on the ramps.

    swapping them will tell us alot
     
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  3. Rigmarol

    Rigmarol Well-Known Member

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    Yup found them.
    Labeled which was which once we got a clear picture to share it came together fast.
    I pulled both T0 and T1 and reconnected them both. Will test next.
    [​IMG]
     
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  4. Rigmarol

    Rigmarol Well-Known Member

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    Tested after just reseating connections of T0 and T1 = no change. Extruder shows 232.0C in the program.
    Tested after switching T0 and T1 = no change. Extruder still shows 231.0C

    Did a preheat on the bed (default is 50C) and the program showed no change but the laser thermometer I got yesterday showed it going to 50C and beyond. I turned it off at 60C.
     
  5. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Well, if the temperature never changed you solved it.
    Sensor was moved.
    Temperature on the input remained the same.

    Try completely disconnecting the thermistor and see what temperature you read.
    However, at this point... Looks suspiciously like the RAMPS.
     
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  6. Geof

    Geof Volunteer Moderator
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    Ditto. My vote is the ramps. When you switched it if it was the thermistor the bed would show crazy high.

    Hit up robo for a replacement. The other option is switching to a generic but it takes some doing and would most likely void future warranty.
     
  7. Rigmarol

    Rigmarol Well-Known Member

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    Thanks guys. I really appreciate the help. I learned a great deal about my printer.
    So when you say "ramps" you're talking the whole board or something on the board?
     
  8. Geof

    Geof Volunteer Moderator
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    The whole board. They are so cheap the parts cost more than the board

    The bottom board is the arduino mega ... Think motherboard or brains

    The ramps is what we are working with which is the top board... Like a connector and power hub :)
     
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  9. Rigmarol

    Rigmarol Well-Known Member

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    Good. Thanks.
    I still have a service request in but haven't heard from anyone yet.
    Then again, it is a holiday weekend.
     
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  10. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Yup, they are really cheap for the generic ones (15 bucks or close).
    Robo wants a good bit more for the custom one, but functionally they are the same -- just different connectors in spots.
     
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  11. Geof

    Geof Volunteer Moderator
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    If your still under warranty its best to wait for them to send you one.

    If you out of warranty :) generic board swap.
     
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  12. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    That is a good way to think of it. The Arduino Mega has a lot of digital and analog I/O, but much of it for printing needs some signal massaging or conversion (i.e. PWM to drive the :steppers and heaters). So the RAMPS is one 'got it all covered'converter for the Arduino that is customized for 3D printing.

    The arduino Mega is just the one of the beefiest Arduino boards out there.


    Mega2560_R3_Label-small-v2 (2).png


    Both are robust boards so I am surprised one is bad, but it is not unheard of. I have lost one RAMPS board and one Arduino board (not on the same printer) myself over the past few years.
     
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  13. Rigmarol

    Rigmarol Well-Known Member

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    Great info guys, i teally appreciate it all. Fyi im well within warranty.

    Sent from my SM-N910P using Tapatalk
     
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  14. Rigmarol

    Rigmarol Well-Known Member

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    Update:
    I had to return to work today after 12 days off for vacation.
    I called support and was on hold for about 15 minutes, not bad really. I've had far worse with larger outfits.
    I spoke with Vanessa who was very sympathetic to my issue.
    After hearing the long story chronicled in the previous posts above; she put me on a short hold while she asked some questions of the techs in the back room.
    They ran through the same things (mostly) that the guys here on the forum suggested then gave me something to try in the settings of Matter Control.
    Basically, they want me to change the default extruder temperature from 210C to 230C to see if I can get it closer to zero when the software opens before preheat. This is the setting I was hoping to find 3 days ago. It's in an advanced tab I was too shy to explore at the time. If it works when I get home I'll share the details. If not, then I'll give them a call tomorrow to try something else.
    (fingers crossed)
     
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  15. Geof

    Geof Volunteer Moderator
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    I'm not sure I follow what their trying for but im very interested to see what shakes out.
     
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  16. 3D Printer Man

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    That basic ally mean that your wiring up to the thermistor bead that a defeat in it.
     
  17. Rigmarol

    Rigmarol Well-Known Member

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    What I think they are trying to is offset the numbers in the software so the baseline better matches real life temps.
    For example my extruder is showing 230C when it's actually only 26C (room temp). In the settings they showed me, they want me to change the default preheat temp from 210C to 230C to see what happens. If everything is working then this might possibly allow me to reset the baseline temperature to more closely match real temps.

    The only thing I'm conserned about is the fact Matter Control shuts down the heat when it thinks we are at about 280C (over heating).

    We'll see. This is the fun part, finding problems and smashing them.
     
  18. 3D Printer Man

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    Actually in my case the thermistor has shorted the wires or the wires are disconected from the bead
     
  19. Geof

    Geof Volunteer Moderator
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    I wouldn't think software would have anything to do with it but mattercontrol is goofy. still anxious to hear the verdict. I'm sticking with our diagnosis lol
     
  20. Rigmarol

    Rigmarol Well-Known Member

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    I got home and made changes close to what they told me to do.
    I'm printing again but I'm confused.
    The laser thermometer says the extruder is running at about 55.4C. Matter Control says it's right at 250C.
    I've been printing for almost an hour now and it's printing perfectly fine!
     

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