Replace fuse for broken fans
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Hey,
Does anybody here do repair work in EU? I'm having problem with my board where none of the fans no longer works, even on alway-on pins.
Not sure what parts of the board that needs replacement and i'm not to handy with the solder iron. Read in a thread that it's probably a fuse or a mosfet that needs replacement.
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It looks like it's the "VIN to Fans Miniblade Fuse 1A" that blown.
What do i need to replace this fuse? Just one Miniblade Fuse 1A - https://www.amazon.com/Kodobo-Fuses-Blade-Circuit-Protection/dp/B07W2XLKL8/ref=sr_1_3?keywords=1a+mini+blade+fuse&qid=1574862406&sr=8-3
Or do i need something more?
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Yes, just get a 1A mini-blade fuse. Filastruder sell a kit: https://www.filastruder.com/products/3-pack-of-fuses-for-duet
You can use 2A, which are more common in car and motorbike parts shops. But more than 2A is not really recommended.
Ian
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Thanks!
How do i replace it? Just pull it out?
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yes you just have to pull it out
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Test the continuity with ohmmeter if you don't see a cut inside, but it seems blown
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And check your fan wiring connections before turning it on, once you put a new fuse in!
Ian
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I've now replaced the blown fuse with a generic mini fuse 2A and the fans are now working again - thanks everybody!
May i suggest to the mods that you change the title of this thread to "Replace fuse for broken fans" or something. It may help somebody else in the future.
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Also a shout out to the electrical designers of the cards - thanks for putting this in!
The fuses are pretty recent addition and I’ve blown them out a good 1/2 dozen times now (got a huge pack off of Amazon...). So very grateful to replace the fuse over a dead board.
Thanks!
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+1....
Make that 7 now.
Upping the fuse to 15 Amps based on this thread:
https://forum.duet3d.com/topic/1925/max-hot-end-heater-current?_=1574893763955If anyone cares, using PTC heaters may cause unexpected blown fuses. The resistance (and thus current) varies with temperature. As the heater gets over a specific temperature (about 60C effective operation) resistance rapidly increases cutting off power to the heater until it cools down. Great for safety.
Downside is that if the heater is cold, the resistance is even lower than normal and can result in a sudden onrush of current before it starts to warm up. Enough to cause a standard 7.5A fuse to blow.
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@TLAS it's fan fuse here, not the bed fuse
so 1A is good -
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@TLAS said in Replace fuse for broken fans:
Tornado-Like Fans - pulls ~2A each
thats not for a 3d printer, is it?
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@Veti said in Replace fuse for broken fans:
@TLAS said in Replace fuse for broken fans:
Tornado-Like Fans - pulls ~2A each
thats not for a 3d printer, is it?
Yes - 252 CFM - it's for blowing the parts off the build plate when the print finishes
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@deckingman
i can see the headlines. tornado created by misconfigured 3d printer. -
@deckingman said in Replace fuse for broken fans:
@Veti said in Replace fuse for broken fans:
@TLAS said in Replace fuse for broken fans:
Tornado-Like Fans - pulls ~2A each
thats not for a 3d printer, is it?
Yes - 252 CFM - it's for blowing the parts off the build plate when the print finishes
lol. :). I guess I shouldn’t mention the 450 cfm one I have in there as well...
