Jump to content

Don't fry your PCB! Check your wires. UM3, S3 and S5


Whom

Recommended Posts

Posted · Don't fry your PCB! Check your wires. UM3, S3 and S5

Hi everyone,

 

Our S5 died recently, and it's taken a while, but I figured out why. Save yourself the hassle now, check two things.

 

Check the heat shrink on the print head capacitive sensor. Replace if worn.

image.png.7fff04c8cc0393f982ada3498caf24e5.png 

 

 

Check your nozzle heater wires aren't sticking down. And if they are, check if the insulation is burnt/worn. Bend the wires up out the way.

image.png.0ff4948cd12a8398e0054f15a2140414.png

 

 

The issue itself if best shown with Ultimaker 3 CAD files, see below. Obviously the tab is bent on the machine, but if the wire sticks down, it hits the tab. The wire is hot, the heat shrink wears away, 24V from the heater fries the PCB on your print head. Auto levelling fails, no way to turn it off, machine is out of action. 

 

image.thumb.png.d20f560c06e4eb56332ab34b1c58c751.png

 

 

I suspect this is a known issue, you can see below the tab direction and the inclusion of heat shrink is a design modification. Picture below taken from UM own website on diagnosing levelling sensor issues.

 

image.thumb.png.ae9cd85268f61c8245f263e24e055b98.png

 

 

Our 18 month old, lightly used S5 now needs a new print head PCB, I had to diagnose this myself as UM support just wanted me to send in the whole print head. Of course, this is out of warranty, so an unwelcome time and monetary cost. 

 

Save yourself the hassle, stop this before it eventually wears out the janky insulation. 

 

Please let me know if you've suffered the same failure. On our machine it was the U8 chip that let out the magic smoke.

 

image.thumb.png.4fd4b92ce0f00f15d519bc19bb3914b8.png  

 

 

 

 

  • Like 1
  • Thanks 1
Link to post
Share on other sites

  • 1 year later...
Posted · Don't fry your PCB! Check your wires. UM3, S3 and S5

Hello, I think I have the same problem.    Could you tell me what the normal voltagecheck is on the bed calibration sensor.   This could be a good indicator if this is the problem.   🙂

  • 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

      • Introducing the UltiMaker Factor 4
        We are happy to announce the next evolution in the UltiMaker 3D printer lineup: the UltiMaker Factor 4 industrial-grade 3D printer, designed to take manufacturing to new levels of efficiency and reliability. Factor 4 is an end-to-end 3D printing solution for light industrial applications
          • Like
        • 2 replies
      • UltiMaker Cura 5.7 stable released
        Cura 5.7 is here and it brings a handy new workflow improvement when using Thingiverse and Cura together, as well as additional capabilities for Method series printers, and a powerful way of sharing print settings using new printer-agnostic project files! Read on to find out about all of these improvements and more. 
         
          • Like
        • 26 replies
    ×
    ×
    • Create New...