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New~ Need Help Please! (couple problems)

Discussion in 'Troubleshooting' started by Darkhunter12, Jun 9, 2014.

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  1. Mike Kelly

    Mike Kelly Volunteer

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    you have a short circuit
     
    #21 Mike Kelly, Jun 12, 2014
  2. Darkhunter12

    Darkhunter12 New Member

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    what do you mean?

    Sent from my GT-I9500 using Tapatalk
     
    #22 Darkhunter12, Jun 12, 2014
  3. Mike Kelly

    Mike Kelly Volunteer

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    I mean when you installed the E3D you short circuited the thermistor leads so it reads 0 resistance, aka max temp
     
    #23 Mike Kelly, Jun 13, 2014
  4. Darkhunter12

    Darkhunter12 New Member

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    Okay,
    How do I fix this problem?

    Sent from my GT-I9500 using Tapatalk
     
    #24 Darkhunter12, Jun 13, 2014
  5. Mike Kelly

    Mike Kelly Volunteer

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    Figure out where the wire is short circuited.
     
    #25 Mike Kelly, Jun 13, 2014
  6. Darkhunter12

    Darkhunter12 New Member

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    I have a question Mike, I think I put the wires for my E3D fan in the wrong place and this could be shorting the circuit, could you please take a photo or tell/show me where the wires should go!
    Thanks :)

    Sent from my GT-I9500 using Tapatalk
     
    #26 Darkhunter12, Jun 13, 2014
  7. Mike Kelly

    Mike Kelly Volunteer

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    Use the terminals where the red and green wires in this picture connect. Note yours will be different colors:

    [​IMG]
     
    #27 Mike Kelly, Jun 14, 2014
  8. Scott Foster

    Scott Foster New Member

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    Hi Mike,

    I am seeing zero bed temp and no heat there. Extruder heats. So I suppose I have a dead thermistor, I will check it's resistance. Are these things not very reliable? Shall I buy a lot and just change as required?
     
    #28 Scott Foster, Jun 14, 2014
  9. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    They generally only die/break if you do something with them :) like replace the hotend. Check that connector on the RAMPS board and make sure it is seated well. If it got knocked loose you could loose heat and/or signal from the thermistor.
     
    #29 mark tomlinson, Jun 14, 2014
  10. Scott Foster

    Scott Foster New Member

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    Just to let you know ... The thermistor and heater resistances are reasonable. Then I discovered a broken wire on the thermistor, other side of the connector under the table (board side). Looks to be a MXN28 4-pin part whatever that is. I can't find it online and it's hard to get a pin out without the wire attached and no idea how the pin lock works. Anyway now the z=0 switch does not work. Where is it these days? (I am looking at an R1). Really guys, this is a QC problem. You need a QC guy.
     
    #30 Scott Foster, Jun 14, 2014
  11. Mike Kelly

    Mike Kelly Volunteer

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    Shipping vibration can lead to wire failures. Is the break on the connector for the bed side or the one that goes underneeth?

    The Z min switches are located on the threaded rod under the idlers
     
    #31 Mike Kelly, Jun 15, 2014
  12. Scott Foster

    Scott Foster New Member

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    The break occurred on the cable from the bed to the main circuit board naturally since the other side of the connector to the bed is all glued down and immobile (although not glued well).

    Easy enough to fix but now I see zero temps for both bed and extruder. I think I am done with this product.
     
    #32 Scott Foster, Jun 18, 2014
  13. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Something is still not quite there. Make sure the connectors are landed/seated well. A little loose can be enough, and yes it can be frustrating...
     
    #33 mark tomlinson, Jun 18, 2014
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