I'm using the PowerWerx Power supply sold by Elecraft. I mixed up the
connections from the binding posts on the back of the power supply then
plugged the other end into the KX3. The KX3 was off. Next I turned on
the power supply. The wire melted, but I think I was able to disconnect
the KX3 right away, so it's possible nothing got into the KX3. Or maybe
the melting wire broke the connection -- I forgot to do a continuity
check on the wire. The KX3 seemed OK, but service said to return it anyway.
David KC1DNY
On 9/5/2020 11:26 AM, Mike Morrow wrote:
The failure reported by G4JQT and the response of KC1DNY do not reflect what should happen when
reverse polarity DC is applied to the KX3 or any other Elecraft rig. All have that series blocking
diode (D6/CMS04 in KX3) that should prevent any significant reverse current flow and certainly
should have prevented "smoke" and "melted wire" from developing. If indeed
that is an accurate report, then an explanation from Elecraft should have been requested.
Something else aside from reverse polarity DC is being hidden in the picture
being presented so far.
Mike / KK5F
-----Original Message-----
From: David Haines <[email protected]>
Sent: Sep 5, 2020 9:17 AM
Don't feel bad Ian. I reversed the polarity from the power supply, too.
After the smoke cleared and the smell went away, I called Elecraft
and after a few questions, service said send in my KX3. They called in a
couple days to thank me for sending the melted wire, but why did I send
the KX3, which was fine? They apologized, checked out the KX3, and
gave me a free replacement wire. Great company!
david, KC1DNY
On 9/5/2020 10:06 AM, Ian Liston-Smith wrote:
Well I did it. Inadvertently got the +ve and -ve reversed. Loud buzz from PSU
and smoke from KX3.
Surely D6 in the volts input should just stop everything from working if the
polarity is reversed? So I don't understand what has happened.
I didn't actually switch it on so hopefully it isn't terminal and just enquires
a new diode. If it is terminal, I'm really surprised it hasn't any protection.
Ian, G4JQT
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