Jump to content
Sign in to follow this  
joergen

fan control burned out?

Recommended Posts

Posted · fan control burned out?

I did a mistake while updating the fan shroud around the print head:

I installed a new fan, and accidentally reversed the polarity, and it fried itself with smoke.

Then I went back to the original fan, only to discover that the fan control didn't work anymore, and the fan always runs when the board is powered up (could be worse).

Did I just fry the BD679 (darlington transistor)? is the BD679 actually driving the cooling fan (I would assume it does), or did I fry more than the transistor?

advice?

joergen

Share this post


Link to post
Share on other sites
Posted · fan control burned out?

I thought fans only usually have a coil in them and wouldn't be affected by reverse polarity except that they'd run backwards.

Share this post


Link to post
Share on other sites
Posted · fan control burned out?

Fans have most times a small pcb, and a SMD control chip, which in my case went up in smoke... no smoke from the main board... just looking for confirmation if the BD679 is doing the fan control or not...

Share this post


Link to post
Share on other sites
Posted · fan control burned out?
Fans have most times a small pcb, and a SMD control chip, which in my case went up in smoke... no smoke from the main board... just looking for confirmation if the BD679 is doing the fan control or not...
The PCB on those fans does the PWM, which is not very wise, as it does the same as the PWM on the UM board.

The BD679 is turning the fan on/off. So if it's always on then it's most likely fried.

It could be that the output of the Arduino is fried, easy to test, turn on the board without the Arduino connected. If the fan turns on, the BD679 is fried.

Share this post


Link to post
Share on other sites
Posted · fan control burned out?
The BD679 is turning the fan on/off. So if it's always on then it's most likely fried.

It could be that the output of the Arduino is fried, easy to test, turn on the board without the Arduino connected. If the fan turns on, the BD679 is fried.

It's fried, thanks for confirming... now I need to find a new one.

Share this post


Link to post
Share on other sites
Posted · fan control burned out?
http://reichelt.de/ sells them for 29 cents, which is cheaper then Farnell. They also have affordable nuts&bolts, and loads of other stuff.

They are in Germany/Europe, I'm in the US/NYC... I'll find a local supplier...

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.

Sign in to follow this  

  • 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.
      • 21 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!