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Unresolved My printbed stops heating.

Discussion in 'Troubleshooting' started by Luis Alberto, Oct 7, 2016.

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  1. Luis Alberto

    Luis Alberto Member

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    Greetings, Im back again. Just like the title says, my printbed wont heat. The sensor placed there seems to be ok cause it reads the temperature, what could be the problem?
    Thanks in advance
     
    #1 Luis Alberto, Oct 7, 2016
    Last edited: Oct 7, 2016
  2. Geof

    Geof Volunteer Moderator
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    Hello! In my check list i look for

    1.bad connections/melted connector.

    2. Suspect ramps is failed (q3 mosfet)...cheap on amazon if you have an r1...if r1+ still cheap but has to be converted

    3. Wildly unlikely but possible a bad power supply (voltage check it)
     
    #2 Geof, Oct 7, 2016
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  3. Luis Alberto

    Luis Alberto Member

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    Thanks. Where should I check the voltages and what values must have? i know that i have to remove the bottom cover of the printer and check there.
     
    #3 Luis Alberto, Oct 7, 2016
  4. Geof

    Geof Volunteer Moderator
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    I would check on the powersupply otself. They will be labeled (if im recalling correctly)
     
    #4 Geof, Oct 7, 2016
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  5. Luis Alberto

    Luis Alberto Member

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    Ill check that first.
     
    #5 Luis Alberto, Oct 7, 2016
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  6. Luis Alberto

    Luis Alberto Member

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    Found the next:
    The first socket was exposed to a lot of heat, and guess it should show 12v but it doesnt.
    The second socket looks alright and shows 12v.
    I think all the heat in the first socket must damage that pin in the power supply pcb and thats why cant see the 12v.
    pic:
     

    Attached Files:

    #6 Luis Alberto, Oct 7, 2016
  7. Geof

    Geof Volunteer Moderator
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    Yes do not use that. You need a new powersupply.
     
    #7 Geof, Oct 7, 2016
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  8. Luis Alberto

    Luis Alberto Member

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    I re-weld that specific pin and shows 12v.
     
    #8 Luis Alberto, Oct 7, 2016
  9. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Probably OK.
    This is almost certainly from the Q3 MOSFET on the RAMPS failing and drawing too much current.
    It is what controls the heated bed so that is why the bed no longer heats for you.

    Easiest fix is to swap the RAMPS board.
     
    #9 mark tomlinson, Oct 7, 2016
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  10. Luis Alberto

    Luis Alberto Member

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    Is it necessary to change the whole board? Isnt possible to get and change only that MOSFET?
    And why does this happened in first place?
     
    #10 Luis Alberto, Oct 7, 2016
  11. Geof

    Geof Volunteer Moderator
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    It happens from time to time. More so on cheaper boards, replacements boards are darn near as cheap as the replacement parts +/-10 dollars US
     
    #11 Geof, Oct 7, 2016
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  12. Geof

    Geof Volunteer Moderator
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    #12 Geof, Oct 7, 2016
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  13. Luis Alberto

    Luis Alberto Member

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    Im not sure. How can I Know? Sorry.
     
    #13 Luis Alberto, Oct 7, 2016
  14. Luis Alberto

    Luis Alberto Member

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    Sorry, it says right in the bed. Its a R1 plus
     
    #14 Luis Alberto, Oct 7, 2016
  15. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    #15 mark tomlinson, Oct 7, 2016
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  16. Luis Alberto

    Luis Alberto Member

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    #16 Luis Alberto, Oct 7, 2016
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  17. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Excellent, you can refer to that thread I linked on how to convert the wiring in the R1+ to use the generic RAMPS. It is not a big change.
     
    #17 mark tomlinson, Oct 7, 2016
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  18. Matt Gorski

    Matt Gorski Member

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    Okay first post for me in the forum so I like to say hi and its great to see so much support for the Robo 3d.

    Now on to my issue. I have lost the ability to heat up my bed now and this happened in the middle of a 4 hour print. The extruder heats up fine when given the command in MC but heat bed will not even start to heat. So I assume this is a mosfet issue and not a power supply since the extruder heats up fine. This is a refurb bought directly from Robo. So what are my options to fix this issue? Do I need to get a replacement part or can I somehow fix this issue with no parts? Thanks in advance for any help from the community.
     
    #18 Matt Gorski, Nov 28, 2016
  19. Geof

    Geof Volunteer Moderator
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    You would need to investigate a bit, but most likely yes a mosfet failure is the most common. Do you have an R1 or R1+? I'm unsure if the refurbs have a warranty but I'd reach out to Robo as well just in case. If you remove the bottom cover from your printer you can inspect the connections for loose or broken ones, anything thats melty etc. Do you have a multimeter and can use it? If so there are voltage checks that can be done. What temperature does the bed show in matter control not heated?
     
    #19 Geof, Nov 28, 2016
  20. Matt Gorski

    Matt Gorski Member

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    Thank you kindly for the reply Geof. I have contacted Robo directly but with the holiday weekend I havent heard a response on my options. This is a R1 Plus. I have checked and tightened all connections and at one point the bed started heating up but now it wont heat at all. There doesn't seem to be any melted connections either. I wil take some pictures and post later today. I do have a multimeter so I can do some more investigation. What connections do I need to test for continuity/ohms?
     
    #20 Matt Gorski, Nov 28, 2016
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