Tom,
I just had the same problem here and it turned out to be the Digital I/O
board (the one with the RS232 & ACC connectors). If you follow the
troubleshooting section in the K3 manual, it has you disconnect
everything but power to the K3, then remove the Digital I/O board, the
KIO3 board and then the KPA3 board while checking after each removal to
see if it powers off normally.
I got lucky and found my problem as soon as I removed the Digital I/O
board. I had a very early version of that board and fried it while doing
the TX Gain Calibration test and popping a fuse on my power cable with
the RS232 port still hooked up to my laptop.
Dale pointed me to the REMIOUPGD option ($20 USD) on the mods page of
the Elecraft site. I received the board in a couple of days and all is
back to normal (whatever that is ;-) ).
Good luck and hope this helps.
73,
Dave W8FGU
On 8/6/2012 11:45 AM,
[hidden email] wrote:
> My K3/100 which is set up with the P3 and then goes to microKeyer II
> will turn back on within seconds of pushing the Power switch. I looked
> at the nabble posts and tried downloading latest firmware....I was only
> off one, 4.48; now 04.51 is installed.
>
> I also disconnected the mK II and removed both the RS232 and ACC plugs
> from the back of the K3. I also removed the power cable from the P3.
>
> The rig still cycles back to on within one or two seconds of pushing the
> Power button to Off. There has been no changes to the rig setup since
> last March when I set up the P3...no local t-storms, etc.
>
> Any ideas?
>
> 73
> Tom
> CX7TT
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