Jump to content
UltiMaker Community of 3D Printing Experts

UM2 Side fans always on, centre fan always off.


Espio

Recommended Posts

Posted · UM2 Side fans always on, centre fan always off.

Hey everyone,

Apologies if this has already been mentioned, I did use the search function but either I'm doing it wrong or it's not there.

The other day my UM2 seemed to short out, after I'd checked everything to make sure nothing had blown I turned it back on and the side fans are acting like they're on 100% permanently. There's just no way of controlling them. Is there anything I can do to sort this without having to resort to a new board? Everything else works fine, it prints absolutely great still, just the fans are annoying when the printer is idle.

Also, for as long as I can remember the centre cooling fan doesn't work, I tried replacing the fan but that's made no difference.

Please help!

Thanks in advance x

  • Link to post
    Share on other sites

    • 4 weeks later...
    Posted · UM2 Side fans always on, centre fan always off.

    Better late than never, I suppose?

     

    Sometimes questions begs more questions, and this is one of those times, I'm afraid.

     

    It's a straight UM2, not a 2+? Regardless, it would be best if you check which main board version you have. It'll say so in the silk screen on the component side of the PCB.

     

    Assuming it's a 2.1.1 and the printer is alive at least (you can make it do things), the hot end fan problem cannot be located on the board, as the 2.1.1 supplies constant +5V directly from the onboard power supply to the fan (except if we're talking copper / connector problems). If the fan isn't running and the problem is on the board, the entire printer would be dead as a hammer. Since you've replaced the hot end fan itself, I'm going to go ahead and assume there's a problem with the fan extender cable in the loom to the head.

     

    The model fans, on the other hand, is extremely likely to be board failure. Regardless of board revision, they're PWM controlled. I'll bet you just about anything that T1 is shorted collector-emitter. Thankfully, if you're handy with a soldering iron or know someone who is, you can get spare transistors thrown at you everywhere. It's a BC817. As you can see, they're certainly affordable enough and stock is never a problem.

     

    /mike

     

  • Link to post
    Share on other sites

    Create an account or sign in to comment

    You need to be a member in order to leave a comment

    Create an account

    Sign up for a new account in our community. It's easy!

    Register a new account

    Sign in

    Already have an account? Sign in here.

    Sign In Now
    • Our picks

      • UltiMaker Cura 5.3 stable released
        In this stable release, Cura 5.3 achieves yet another huge leap forward in 3D printing thanks to material interlocking! As well as introducing an expanded recommended print settings menu and lots of print quality improvements. Not to mention, a whole bunch of new printer profiles for non-UltiMaker printers!
          • Thanks
          • Like
        • 31 replies
      • Here it is. The new UltiMaker S7
        The UltiMaker S7 is built on the success of the UltiMaker S5 and its design decisions were heavily based on feedback from customers.
         
         
        So what’s new?
        The obvious change is the S7’s height. It now includes an integrated Air Manager. This filters the exhaust air of every print and also improves build temperature stability. To further enclose the build chamber the S7 only has one magnetically latched door.
         
        The build stack has also been completely redesigned. A PEI-coated flexible steel build plate makes a big difference to productivity. Not only do you not need tools to pop a printed part off. But we also don’t recommend using or adhesion structures for UltiMaker materials (except PC, because...it’s PC). Along with that, 4 pins and 25 magnets make it easy to replace the flex plate perfectly – even with one hand.
         
        The re-engineered print head has an inductive sensor which reduces noise when probing the build plate. This effectively makes it much harder to not achieve a perfect first layer, improving overall print success. We also reversed the front fan direction (fewer plastic hairs, less maintenance), made the print core door magnets stronger, and add a sensor that helps avoid flooding.
         

         
        The UltiMaker S7 also includes quality of life improvements:
        Reliable bed tilt compensation (no more thumbscrews) 2.4 and 5 GHz Wi-Fi A 1080p camera (mounted higher for a better view) Compatibility with 280+ Marketplace materials Compatibility with S5 project files (no reslicing needed) And a whole lot more  
        Curious to see the S7 in action?
        We’re hosting a free tech demo on February 7.
        It will be live and you can ask any questions to our CTO, Miguel Calvo.
        Register here for the Webinar
          • Like
        • 18 replies
      • UltiMaker Cura Alpha 🎄 Tree Support Spotlight 🎄
        Are you a fan of tree support, but dislike the removal process and the amount of filament it uses? Then we would like to invite you to try this special release of UltiMaker Cura. Brought to you by our special community contributor @thomasrahm
         
        We generated a special version of Cura 5.2 called 5.3.0 Alpha + Xmas. The only changes we introduced compared to UltiMaker Cura 5.2.1 are those which are needed for the new supports. So keep in mind, this is not a sneak peek for Cura 5.3 (there are some really cool new features coming up) but a spotlight release highlighting this new version of tree supports.  
          • Like
        • 23 replies
    ×
    ×
    • Create New...