[Elecraft] Dead K3

[Dale Boresz]

If you can, check the resistance across the K3 "12VDC IN" Power Pole 
connections (after you've disconnected your Power Supply of course).

On my K3, an internal zener-like diode (D28 on the RF Board) evidently 
gave up its life to protect the radio from an overvoltage, and evidently 
the failure mode is a short circuit. This diode goes straight to ground 
immediately after the 6A inline fuse. I think the fuse is an 
auto-resetting fuse, so you can probably assume it is still completing 
the circuit for the purposes of your resistance measurement. If you 
measure a dead short, the culprit is likely D28.

73, Dale
WA8SRA




On 7/29/2012 6:32 PM, Dr. William J. Schmidt, II wrote:
> So I was testing out my new K3 before I take it to J6 next week for a little
> DXPedition work. and after about an hour of operation.. it just quit.  Dead
> as a door nail. has power to the back (checked) but never so much as the
> display activating.  Any ideas?  I SURE don't want to go back to that Flex
> 3000 that I had so much trouble with on PJ4..
>
>   
>
>   
>
> Dr. William J. Schmidt - K9HZ / J68HZ/ 8P6HK/ ZF2HZ
>
>   
>
> Owner - Operator
>
> Big Signal Ranch
>
> Staunton, Illinois
>
>   
>
> email:   <mailto:bill at wjschmidt.com> bill at wjschmidt.com
>
>   
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>