Re: [CAD_CAM_EDM_DRO] Re: blown Gecko - shorted output ?

I have fixed them by replacing the mosfets, you can get them at Digi_Key.
You need t0 check the large resistor close to the mosfets to make sure it is
not open.
the resistor is less than one ohm at about 3 watts I believe. I ordered both
form Digi-Key.
De-soldering is a bit of a job.
good luck
Jim Cullins
Sound Logic

----- Original Message -----
From: "resosys" <resosys@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, March 26, 2003 4:10 PM
Subject: [CAD_CAM_EDM_DRO] Re: blown Gecko - shorted output ?


> Dave et all,
>
> > I blew us a couple Gecko 201's over the last week. Yeah, I'm
> > thinking of pre-purchasing some of the more bullet proof ones when
> > available.
>
> I've done the same thing and was wondering if you'd discovered the
> problem and found a fix? I read this entire thread and found I'm
> living a parallel nightmare to yours :-).
>
> I've got an almost identical setup to yours except my machine chassis
> has no 110AC ground attached since I'm using a plasma torch as a cutter.
>
> <snip>
>
> > I bench tested a stepper, worked great. mounted it on the machine
> > and pop. blew something in the Gecko. Mariss said it might be the
> > outputs but only testing will reveal the answers.
>
> I've tested the motors and wiring with my last working 201. It is
> still mounted in the controller box and working right next to the
> blown one.
>
> > what irks me is that one axis has been solid for the duration, runs
> > perfectly. the other had 'eaten' 4 Gecko's. as you can imagine I'm
> > not excited to just throw on another Gecko to see what happens.
> > What bothers me is that I ran all weekend with no problems. 2 I blew
> > on setting up. I assumed that I did something stupid, but now that I
> > blew up another 2 with everything I knew to test, tested, I am
> > nervious.
>
> Me too. I'm afraid to take the working one out for fear it will get
> snooty and give up the ghost.
>
> Any info you received from Mariss or others would be much appreciated.
>
> Thanks,
>
> Chris
>
>
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