[Elecraft] [K2] Random LCD display - Speed and Power

[Martin Rath]

Hi Don,

Thanks for your usual support.

I built the K2 back in 2004 : I don't know if it would have the new or the
old encoder board.

I would need to check what type of encoder board I have inside but I cannot
recal having it on a different board (and by looking at the construction
manual that I have it doesn't seem to refer to any additional control
board). I have no mean to actually open it here as I'm far from my work
bench.  Are you refering to the board described in this manual :
http://www.elecraft.com/manual/E740177%20K2%20Encoder%20Installation%20Instructions,%20rev%20B.pdf
? If yen then I clearly have the old one with the long leads. In my manual
it's described in figures 5-18 and 5-19 on page 32.

The K2 had not been used for several years (almost 6 !). It has now been
plugged to a battery for over 48 hours and doesn't exibit the blinking
phenoma anymore (and it never did befofre. I wonder if it could be related
to chemical capacitors ...


73's Martin 9V1RM



On Mon, Jul 31, 2017 at 1:01 PM, Don Wilhelm <donwilh at embarqmail.com> wrote:

> Martin,
>
> While that may happen rarely in any K2 - when the firmware is quite busy,
> your video shows it happening frequently, which is abnormal.
>
> The most common cause of that behavior is in late K2s with the new encoder
> - the one with the encoder board that sits close to the control board.  If
> that describes your K2, then flush cut the encoder board leads (really
> close to the board) and do the same on the control board in the area where
> the encoder board can contact the solder side of the Control Board.
>
> If your K2 has the older encoder, then look for a bad solder connection on
> either the Control board or the Front Panel board.
>
> 73,
> Don W3FPR
>
>
> On 7/31/2017 5:06 AM, Martin Rath wrote:
>
>> Hi,
>>
>> I happen to be in Europe for a few weeks of holidays and wanted to use my
>> old K2 that I never imported into Singapore for some QSO's.
>>
>> I'm facing an issue with the LCD randomly flickering and displaying the
>> power and speed.
>>
>> I have also experienced that when I'm in the middle of a QSO the speed
>> will
>> randomly change.
>>
>>