[Elecraft] KAF2 possible problem.

[Ron ZL1TW]

Greetings all,
                     Some time back I installed the KAF2 (Mid Jan), and it 
worked fine , in fact it still does, but I recently had reason to suspect 
it caused a wee problem in my radio.
I was doing my EMail one morning, and the K2 was set to listen to a local 
net, when all of a sudden there was quite a loud "POP" and the audio 
dissapeared. Tuning didn't alter the frequency the display was set to, and 
I couldn't change bands. I turned the set off and on again...no change.
I then turned it off and finished my EMail before trying again......this 
time the set booted up fine and worked as it should.
I popped a note off to Gary to suggest what to look for, and one suggestion 
of his was to look at the KAF2 and see I had clearance between the bottom 
of the KAF2 board and the two larger caps under it, on the Control board.
I didn't have any, so I removed the KAF2 and the stand off, and placed one 
of the flatter wave washers over the threaded end of the stand off and 
reinstalled it, and the filter again. This time I had a small but distinct 
gap between the components.
Now while this might be "stab in the dark" problem solving, I had reason to 
believe a short may well have happened there when I looked at the clock 
display. It showed the 01.01.01 display you get when you first boot the 
clock into life.  Subsequent resetting of the clock has been 
successful,and   there have been no further mysterious outages.
There may well have been a posting on this reflector in the past regarding 
making sure there is indeed clearance  under the KAF2 , my apologies if I 
am re-writing history, but I guess it doesn't hurt to repeat these traps 
once in a while for the up and coming  constructors.
Cheers........Ron ZL1TW