Jump to content
Ultimaker Community of 3D Printing Experts
Sign in to follow this  
veedee

Serious fan problem

Recommended Posts

Hi Guys,

I Have a very serious problem here. One of my ultimakers one just stopped working randomly. After I disconnected and reconnected the power cord, the printer works again, BUT, the print-head fan is now constantly spinning at maximum speed, I can't control the speed anymore and it turns on at full speed right after I flip the printer's master switch.

Can someone help me with this problem?

 

Share this post


Link to post
Share on other sites

Sounds like the darlington pair transistor that controls the fan was shorted. Sometimes they fail closed and the fan runs at full as soon as power is applied.

The question is why? Check for shorts in the cable going from the control board to the hotend especially the connectors.

You will need to unsolder and replace the BD679

Lots of posts on this. See https://www.google.com/search?q=www.google..com&oq=www.google..com&aqs=chrome..69i57j69i65j0l2j5l2.4034j0j4&sourceid=chrome&es_sm=122&ie=UTF-8#q=site:umforum.ultimaker.com++BD679

 

Share this post


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
Sign in to follow this  

×

Important Information

Terms of Use Privacy Policy