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  1. #1

    Blown fuse for heated bed Prusa i3

    Hi all, I have a Prusa i3 Printer I recently bought on eBay. Today was the first day I had it running and printing properly I had it printing probably about 6 hours solidly. I had a break for some food and came back and noticed the bed wouldn't heat up. After a bit of investigation I found a blown fuse on the board.

    See photo, under the power connector fuse on the right.


    It is marked LF15a.

    I believe it is one of these 2
    http://uk.rs-online.com/web/c/fuses-...sid=4294959274

    Am I right in thinking the voltages specified are max and I will be fine with the 65v ones?

    I also had other questions, any idea why it blew? I read somewhere these beds can run at 180c, I had mine set at 110c which translates to 60-65c on the glass surface. Was I pushing it too hard?

    Thanks Chris

  2. #2
    Engineer-in-Training ServiceXp's Avatar
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    I think that fuse opened up due to a bad fuse socket. You will need both.

  3. #3
    Quote Originally Posted by ServiceXp View Post
    I think that fuse opened up due to a bad fuse socket. You will need both.

    Sorry I don't understand do you mean desolder and replace the socket?

  4. #4
    Engineer-in-Training ServiceXp's Avatar
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    Sorry for the delay,... Yes, you will need to de-solder and re-solder a new socket on the board.

  5. #5
    I have this exact issue (mine looks even more burnt out) did you manage to fix it yourself in the end?

    Sourcing a new socket has been a real pain for me.

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