Quoting Vik Olliver :

> Having just built a V1.2 extruder board, I thought I'd test the fan -
> I've never powered one off the stepper driver before. It appears that
> when I turn the fan on using the L298N, it also enables the extruder
> motor. This didn't happen on the old circuit using TIP120s to drive the
> fan and extruder, my soldering looks sane, and the fan doesn't turn on
> when I energise the extruder motor. Any ideas?
>
> I'm using firmware from the V1.0 firmware zip file off Sourceforge.

I think that may be an old firmware prob. Try a build from the sources
in the repository. My boards all have L298Ns on, and none do that.

Best wishes

Adrian

Dr Adrian Bowyer
[staff.bath.ac.uk]
[reprap.org]
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On Tue, 2007-06-12 at 21:34 +0100, Adrian Bowyer wrote:
> I think that may be an old firmware prob. Try a build from the
> sources
> in the repository. My boards all have L298Ns on, and none do that.

No, it was me. I dunno what exactly, but I rechecked and re-soldered
everything and the problem went away. Must've picked up some conductive
crud off my soldering bench, or got some cat spittle in the works...

Vik :v)

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