[Elecraft] K3: reverse 12 volt supply

[Harry Yingst via Elecraft]

Ouch, sorry to hear that.

If you are lucky it may have only blew a cap or possibly belted a trace.

I would open it up and look at the PA deck to look for obvious damage.
As far as future prevention, label clearly and double check.One thing I do not like on the K3 (and mosst radios that use Power-poles) is that the Power-poles are not recessed, it makes it way to easy to put them in to the side.

I build distribution boxes and the Power Poles are slightly recessed to prevent this.
I have a part I machined that will surround the power-pole and prevent this, I just need to install-it on My K3 next time I have it apart.





      From: roger wood <roger.wood at ieee.org>
 To: Elecraft <elecraft at mailman.qth.net> 
 Sent: Sunday, September 13, 2015 1:24 PM
 Subject: [Elecraft] K3: reverse 12 volt supply
   
I managed to connect a 12 volt car battery backwards to the K3.

There was a lot of smoke and the breaker popped.  The RX and TX appear to
have survived, however the internal 100 Watt amplifier now shows an
over-current fault and quickly switches off.  I haven't dared open it up
yet - far too depressed now. I'll leave it till next  weekend.

Any comments on what I might expect to find inside and how to idiot-proof
it for my future operation?

73
Roger
KK3RW / G3WEW
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