[Elecraft] K2 BFO issues

[Don Wilhelm]

Anthony,

When you put the K2 into CAL FCTR mode, what is the voltage at the ends 
of R98 (on the bottom of the board).  I am interested only in the 
highest voltage.

With the new K2s (those using the new encoder board), many strange 
problems are caused by contact of the encoder board with the Control Board.
You must flush trim the leads on the encoder board - and I mean almost 
right down to the board level.
Also you must flush trim the back of the Control Board in the area that 
could come in contact with the encoder board.
Make sure the rubber bumper pads are in place at the top corners of the 
Front Panel Board.

As a test, remove the 2 screws that secure the Control Board to the 
Front Panel and tilt the top of the Control Board to the rear.  If 
things then behave normally, you can be certain that contact between the 
encoder board and the Control Board is causing the problem.

73,
Don W3FPR

On 5/30/2017 8:07 AM, Anthony Clare wrote:
> Hello:
> 
> Looks like I am not the only one to have this problem. Just finished assembly
> phase 2(?) on the K2. It was during the BFO tests that I realized there was
> not enough signal at the test point for the internal counter. I checked for
> poor solder, improper varactor diode install, verified that L33 was intact and
> not being shorted by the 5 meg resistor, etc. I ran one crystal at a time, but
> neither one would provide the proper signal level alone. I even checked L33 on
> the inductance meter and it came out to about 39uH, which seems about right. I
> assume the inductance meter has some error. The resistor measures out to about
> 5 meg.
>