[Elecraft] k2 main tuning locked up

[Don Wilhelm]

Jim,

Is this a newer K2 which uses the new encoder with the circuit board on 
the back of it?  If so, both the encoder board and the area of the 
Control Board behind the encoder board must be flush trimmed - and I 
mean really flush trimmed.  Contact between the encoder board and the 
control board will cause problems like you describe as well as other 
"funny happenings".  You can move the lockwashers on the Front Panel 
board for the standoffs between the front panel and control board from 
under the screwhead to the other side of the board (under the standoff) 
to provide a little more clearance.

If you have the older encoder (without the PC Board), then check the 
soldering of the encoder pins and the wires to the Front Panel board.  
Also reflow the soldering on all the connectors that carry the ENC A and 
ENC B signals - there are connectors on the Front Panel, the RF board (2 
connectors) and the Control Board.

If all else fails, order a new encoder.  It will be the encoder with the 
circuit board, so the cautions in the first paragraph apply, and you 
will have to ream the front panel encoder shaft hole slightly to pass 
the threads of the new encoder.  The new encoder kit comes with a new 
knob - the old one will not fit the shaft.

73,
Don W3FPR


On 2/16/2016 1:57 PM, Jim Allen wrote:
> I had this happen the other day.  Turning the main tuning knob did not
> change the frequency.  I microsofted it (turned it off and rebooted) and it
> was restored to proper operation that time.
>
> Now, it is frozen once more and that has not fixed the problem.
>
> The only thing I could find in the documentation dealt with locking the
> VFO, and unlocking.  I have verified that it is "nor."
>
>