[Elecraft] Help Please KIO2 L4 Burnt Out

[Guy Olinger K2AV]

All you'd have to have is one ground not making contact until you pushed or
checked it.  Power ground is an important issue to have exactly right all
the time. You can sometimes eliminate some possible paths with separate
power supplies for some station gear.  W4TV has a list of recommendations
for that based on the Microham boxes.  He's focusing on ground hum and
such, but the principle applies to your situation as well.  If you
understand the why for W4TV's stuff, you will see  how to prevent
recurrence of  your case.

73, Guy.

On Tue, May 15, 2012 at 8:40 AM, Don Wilhelm <w3fpr at embarqmail.com> wrote:

> Mike,
>
> As Guy suggests, check the ground return between your K2 and the power
> supply.  Also check the ground path between the computer and the K2.
> Make sure all ground paths are intact,
>
> 73,
> Don W3FPR
>
> On 5/15/2012 8:03 AM, VK1OO wrote:
> > Hi Guy,
> >
> > Thought I would let you (and the reflector lurkers)  know the problem is
> > solved, but I'm not sure how.
> > Not a connector issue - I did one of the mods a while back to prevent
> that.
> > I did check each of the power leads to the K2, KPA100 etc, but found no
> > faults.  Subsequently measured the current through the L4 vias as as
> > 0.4mA. So perhaps checking each cable scared the fault away.  I inserted
> > a new L4 and monitored the current for a few days with no observed
> > issues.  Put the trusty K2 back together and no problems since. So,
> > what's the best way to prevent a recurrence of this problem?
> >
> > Mike
> > VK1OO
> >
> >
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