[Elecraft] K2 BFO CW alignment question

[Don Wilhelm]

Mark,

OK on that.  Since you have the new encoder board, it could be touching 
the pins on the back of the Control Board which can cause all kinds of 
"strange happenings".
First step is to flush cut (diagonal cutters will not do the job) the 
pins on the encoder board (cut right down into the solder). Then flush 
cut the leads on the back of the Control Board where it can contact the 
encoder board.
As an added protection measure, put a piece of card stock (business card 
of part of a QSL card) between the encoder board and the Control Board - 
or better yet a flat piece of plastic, like that used in many shrink 
wrapped packages from the store.

Then see if the behavior settles down.
If it does not, you will have to find the problem in the Front Panel 
switch matrix (not an easy task).

73,
Don W3FPR

On 6/10/2018 6:44 PM, Mark Petrovic wrote:
> Don, the soldering on RP1 is very clean, top (viewed from the side of 
> the board with a light and magnifying glass) and bottom.  RP1 is 
> aligned correctly, and I've verified that it is the correct part for 
> this location.
>
> Worth mentioning is that the rubber spacer that installs onto the 
> bottom-side of the board in the corner nearest pin 10 of RP1 is 
> attached with a small drop of super glue (the original adhesive on the 
> rubber pad failed, as the pad fell off during casual handling of the 
> board).  My understanding is that this cyanoacrylate  super glue  is 
> non-conductive, nor does the spacer w/glue bridge any solder pads.  
> I've not inspected the front panel board from the top, as this would 
> require unsoldering the 4 leads holding the encoder board to the front 
> panel board.
>
>