[Elecraft] K2 - hang up problem

[Geoffrey Mackenzie-Kennedy]

A problem that appeared in my K2/100 #3255 some years after it was built, 
and again about a year later, might or might not be relevant. My K2 went on 
'strike' while in use, and none of the front panel controls except the power 
on/ off switch had any effect. The display showed the frequency in use when 
the K2 acted up, and tuning did not change it period. Turning power off and 
back on did not solve the problem, and the displayed frequency did not 
change.

In both cases the problem was caused by the socket of U6 the Control Board 
MCU, pulling U6 and reseating it cured the problem. After the second episode 
I replaced U6's socket with a 'Turned Pin' type which I should have used 
when building the rig. The type of socket supplied with the kit can often 
give rise to 'corrosion' problems, which result in poor contact between IC 
pins and the IC socket.

73,
Geoff
GM4ESD


 "N2TK" <tony.kaz at verizon.net> wrote:


>
> Before I tear into the K2 to find  out what happened today I figured I 
> would
> ask on here in case someone has seen this  problem before.
>
> It receives fine on all bands. When I transmit (does not matter what power
> level or what band) it hangs up. If I keep it on the transmit mode power 
> out
> is fine. If I let it go back to the receive mode the receive signals are
> very, very weak. If I talk into the mike, there is no power out and I have
> side tone in the headset so I can listen to my transmit audio.
> To correct this problem I need to change bands or shut off then on the
> radio.
>
> Anyone hear of this problem before?
>
> Tnx for any ideas before I pull out the schematics and take off the 
> covers.
>
> 73,
> N2TK, Tony