[Elecraft] K2 - Bar Graph Erratic - New symptoms

[Robie Elms]

This problem has been resolved.   I was able to identify a poor solder
joint on the bar graph IC.  Reflowing the joint solved the problem.

73,

Robie - AJ4F

On Sat, Apr 27, 2019 at 8:57 PM Robie Elms <ruler55 at gmail.com> wrote:

> I posted several days ago about the bar graph (s meter & w meter) on my K2
> was erratic.  I received suggestions suggesting changing the RF gain
> control and re-doing the S meter calibration.  Today i did the following:
>
> 1. carefully monitored the audio from K2 as the RF gain control was
> rotated and found it to be smooth and without dead spots etc.
>
> 2. checked the AGC threshold and found it to be 3.8 v.  in the CAL S LO
> mode found the settings to be per the S-meter alignment procedure.
>
> 3. in the CAL S HI mode i could not get segments past the 2 left most ones
> to eliminate.  Left adjustment as found
>
> 4. In the transmit mode only the 2 left most segments illuminate
> regardless of the power setting.  Placing the Display in RF mode the output
> power varies smoothly from 0.1 to well over 10 watts.  However, the bar
> graph never illuminates more than the 2 left most segments.
>
> 5. this seems to suggest an issue with the front panel board associated
> with the bar graph display.  Any suggestions on next steps, what to look
> for on the board or other ideas?
>
> Thanks in advance,
>
> Robie - AJ4F
>
>