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fan printhead don't work anymore

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hello, the fan printhead from my original ultimaker wont work anymore?

when i connect my printer with the powercord and usbcable en put the power on

i have a voltage of 19V on the purple and blue wire on top of the printhead. and when i start printing the voltage drops to 14V but the fan wont start to drive anymore??

when i test the fan on a 12v battery it works.

anyone a idea what is wrong?



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Ah. Good picture. Okay. This implies the darlington transistor is blown.

Um Fan

Q4. It has enough power to drive the multimeter to 17V but not enough power to drive the fan. You attached 12V to the wire under the printer right?

This transistor is easily damaged by normal use. I recommend you simply replace it.


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In theory it could damage the arduino I think (I didn't look at the schematic just yet though). So I would recommend removing the transistor.

You can usually print without fan, especially large parts but no fan can make some things worse:


top surfaces might bulbble


Or if you are printing something small, less than 10 seconds per layer, then the fan is a huge help.


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