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Extruder not working

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Hi All,

I have an Ultimaker original. I turned it on after a couple of months rest, attempted a print and it wasn't working well at all. A bit of investigation and I noticed the extruder would not always spin (sporadic) until it didn't spin at all. swapped out stepper drivers, cables, etc. and all pointed to a problem on the main board. I ended up taking the main board out and and resoldering all connections in case there was a dry solder. I also replaced the 100UF 50v cap under the extruder stepper driver.

I have also been having problems with my head fan (ie. the board was not getting a signal so had a fan connected to a dial straight to the power supply bypassing the main board altogether). Whilst it was out I also resoldered the connections around the fan but made the mistake of getting the head fan and the board fan mixed up and replaced the MOS above the board fan when I didn't have to.

So, put it all together, nothing happens. The green led power light on the main board goes on, nothing else (not even the display).

I then plugged my PC into the unit via USB and it powers on, I have the display, no errors and it looks fine. I can even move X, Y and Z axis no worries, but the extruder still eludes me. I've also tried using Pronterface but still can't get the extruder to work.

Any idea what may be going on with the extruder and, why will the printer only work when the USB is connected (I'm thinking it's the MOS above the board fan just below the stepper for the second extruder)?

Appreciate your help, starting to panic i may have inadvertantly destroyed the board and they are Oh so expensive (like

Edited by Guest

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