Jump to content
shurik

SOS - The bed doesnt heat up - UM2

Recommended Posts

Posted (edited) · SOS - The bed doesnt heat up - UM2

So, my 2.5 years old UM2 starts showing its age.

The topic title tells it all. The display shows the current temperature (26C) and that doesn't change.

No apparent damage, the device was staying all the time at the same place.

Where shall I start looking?

And all that when a few orders are waiting... Urgh!

Edited by Guest

Share this post


Link to post
Share on other sites
Posted (edited) · SOS - The bed doesnt heat up - UM2

At the connectors at the heater pcb. If they look ok, remove the thick lines and measure the resistance at the connectors. If you don't get any value, the pcb is broken. Next test would be if you get the voltage on the lines you just removed (just be careful with this).

If you don't get it running again and if you are printing PLA: take out a roll of blue painters tape and feel the glance of past days... ;)

Edited by Guest
  • Like 1

Share this post


Link to post
Share on other sites
Posted · SOS - The bed doesnt heat up - UM2

Shurik, Privet!

Test elektrikal resistance (ohm) between the leads to the heat bed.

You can do that by loosening only one of them from the CPU board.

However, there is a 90% chance you only need to tighten the screws holding the cables from the bed to the CPU board. Use a small screw driver and tighten the crews..

  • Like 1

Share this post


Link to post
Share on other sites
Posted · SOS - The bed doesnt heat up - UM2

It was somewhat common back then that the solder joints on the screw terminals were crap. So take a look at those and see if you need to re-flow them.

  • Like 1

Share this post


Link to post
Share on other sites
Posted · SOS - The bed doesnt heat up - UM2

Thanks guys, I knew that despite the forum's design, you can be relied upon.

I put gluestick on the glass and continue with PLA prints (first time ever on a cold bed!), so far so good.

However, with deep embarrassment I have to say that my electrical skills and understanding are sub-zero.

I do not know what is pcb and how to test the electrical resistance. :( Not to say that no equipment for that exists in my house.

However, my hands are mostly at the right place, so if you could point me out (maybe, with some pictures or drawings?), I will try to find my way.

Cheers!

Share this post


Link to post
Share on other sites
Posted · SOS - The bed doesnt heat up - UM2

I would take out the heated bed (carefull it can bend) and look closely at the soldering points.

Ofc, first check that all the cables are on the board perfectly fit. Makes photos if you see something weird. Compare it to the um2 assembly manual. (It's on the github)

  • Like 1

Share this post


Link to post
Share on other sites
Posted · SOS - The bed doesnt heat up - UM2

OK. Took out the heatbed. The cables look OK. Tightened the screws. Nothing.

Took out the main board, it looks fine. Checked the cables, tightened the screws. No effect.

Next step, I believe, should be checking the voltage/resistance on the main board contacts, right?

Share this post


Link to post
Share on other sites
Posted · SOS - The bed doesnt heat up - UM2

This image shamelessly stolen from Illuminarti: https://umgallery.ultimaker.com/uploads/gallery/album_27/gallery_341_27_479366.png

That image shows how to measure the temperature sensor on the board. The remaining terminals are for the resistive track on the PCB that heats up. That resistance should be about 3-4Ohms.

Also try measuring from the solder joint to the pin of the connector and see if there is continuity there. Like I said earlier, sometimes that solder joint is bad and it can be almost impossible to see with the naked eye. A small hairline crack can be enough to make it so that there is only intermittent contact between the connector and the board.

  • Like 1

Share this post


Link to post
Share on other sites
Posted · SOS - The bed doesnt heat up - UM2

Happy end!

The soldering pointed by my red arrow below was slightly burnt out. Re-soldering fixed that.

gallery_341_27_479366.thumb.png.0212b5aa5c64bf9a6bbfd498980fa654.png

Many thanks to everyone!

gallery_341_27_479366.thumb.png.0212b5aa5c64bf9a6bbfd498980fa654.png

  • Like 3

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Our picks

    • Ultimaker Cura 4.0 | Stable available!
      Ultimaker Cura 4.0 is mainly focused on the improved user interface and cloud integration.
      As always, we want to collect your user feedback for this release. If there are any improvements you can think of, feel free to mention it here and help us to shape the next release.
      • 98 replies
×
×
  • Create New...

Important Information

Welcome to the Ultimaker Community of 3D printing experts. Visit the following links to read more about our Terms of Use or our Privacy Policy. Thank you!