[Elecraft] K2 Build #7552

[Vic Rosenthal K2VCO]

I think you should go over all the solder joints on the control board. 
Just heat them up and apply a tiny bit of solder. Wait till it flows. It 
is not a good solution to leave out the screws, because oxidation may 
ultimately make the bad solder joints fail even when the board is not 
stressed.

If you don't have a good temperature-controlled soldering station, it's 
worth considering.

On 9/29/2014 05:14, Kevin Schache wrote:
>
> Many thanks to Don and others who responded.
> The problem has been fixed, I found a suspect dry joint on the PTT/ATT
> switch.
> I also checked the new encoder which appeared ok but I did insert a very
> thin piece of insulation between the new encoder and the control board
> to make sure.
>
> All tests now appear ok UNTIL I re-insert and tighten the two holding
> screws in the Control Board. When these are tightened, the control board
> is pulled about 1/8th inch toward front panel, probably stressing both
> boards, causing the display to be erratic (ELICRAFT instead of ELECRAFT
> for example), and erratic other test results. Stressing the boards may
> be causing movement in sockets where they are used.
>
> Does it matter if I leave those two screws out?
> Another option would be to put in longer screws and not tighten them so
> much, or perhaps a better suggestion maybe to increase the spacer length
> marginally, so that there is no stressing.
>
> 73,
> Kev     VK5KS

-- 
73,
Vic, K2VCO/4X6GP
Rehovot, Israel
http://www.qsl.net/k2vco/