[Elecraft] K2 / 10 - Freeze Up

[Geoffrey Mackenzie-Kennedy]

Chuck,

My K2/100 #3255 built in 2003 has behaved in a similar fashion twice, the 
first episode taking place in 2005 after the rig had been in "receive mode" 
for several hours. The only front panel control that had any effect was the 
power ON-OFF switch.

In my case the problem was caused by the socket used with U6, the MCU on the 
Control Board.  Pulling and reseating U6 cured the problem, which made me 
suspect that corrosion had built up on one or more of the socket's contacts.

After the second episode many months later I changed U6's socket to a Turned 
Pin type, a type of socket that I should have used when building my K2. I am 
not suggesting that you make this change, but I want to alert you to the 
fact that the type of socket supplied with the kit can cause problems due to 
corrosion of the contacts.

73,
Geoff
GM4ESD


Chuck AF4PP wrote on Thursday, September 11, 2008 at 6:57 AM

> In the last several weeks have experienced a freeze-up
> almost every time used. Will have completed my side of
> QSO and received without any problem the other party.
> Upon their turnover discover that I have no transmit.
>
>
> The display will generally be showing power but,
> sometimes keyer speed and no amount of control
> twisting or button purshing will effect any change.
> Recycling power will yield "ELE" in the display but,
> otherwise the rig is totally non-functional.
>
> After several hours, can turn K2 back on and all is
> apparently normal.