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fan printhead don't work anymore


roald
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Posted · fan printhead don't work anymore

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?

Roald

 

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    Posted · fan printhead don't work anymore

    Yes. When you put the 12V on the fan, was it still attached to the print head? Or did you remove it? Did you apply 12V at the print head or underneath the UM?

     

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    Posted · fan printhead don't work anymore

    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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    Posted · fan printhead don't work anymore

    yes i have the blue and purple wire attached under the printer with the 12v battery the cable is oke.

    i try to order the BD679 darlington transistor replace it, i let you know if it have solve the problem ;) thanks for your fast help

     

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    Posted · fan printhead don't work anymore

    They all look fine.

     

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    Posted · fan printhead don't work anymore

    My darlington also blew up. I can't find a BD679, but I could get a BD683, is that ok for a replacement?

     

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    Posted · fan printhead don't work anymore

    I looked at the spec sheet and the BD683 looks fine.

     

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    Posted · fan printhead don't work anymore

    That's great, thanks! BTW, can I run the printer (for printing ABS) with the darlington busted without frying anything else?

     

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    Posted · fan printhead don't work anymore

    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:

    overhangs

    top surfaces might bulbble

    bridging

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

     

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