[Elecraft] K2, Hi-cur reading

[Don Wilhelm]

Hans,

You will have to remove the connector from P6 - the K2 still thinks the 
KAT2 is connected.
If you installed all 10 pins as instructed, it will be tight.  Try 
prying it up bit by bit with a small screwdriver.

The 320 ohms on the collectors of Q7 and Q8 indicate that the PA 
transistors have failed.  It is possible that your initial problems with 
the KAT2 caused the PA transistors to be stressed.

I would strongly recommend that you order the K2PAKIT from Elecraft 
because it contains matched PA transistors and also replacements for Q11 
and Q13 which sometimes fail as a secondary problem when the PA 
transistors fail.

73,
Don W3FPR

On 3/14/2013 5:09 PM, Hans Elfelt Bonnesen wrote:
> Thanks for snappy reply to KAT2 troubles.
> Started on your presumption that connection to dummy load was unstable or non exsisting. It wasn't.
> Was about to take ATU apart for a rewinding of T1 but --
> quickly decided to check the K2 in its original condition.
> Disconnected J7 and J8 + removed ATU from lid.
> Switching to original antenna plug and thus went back to
> K2's former condition with one exception : The new P6 plug was now sitting in its place, as it is hard to
> remove.
> Connected K2 to adjusted antenna and (ALAS !!) had the dreaded Hi-cur info on display.
> Resistance from collectors of Q7/Q8 to ground are both around 320 ohms . Thermal pads neatly intact. Shoulder washers in place.
> +++
> Beginning to feel that the initiating ATU problems during CALn procedure was in fact a malfunction in the K2 itself.
> Where to look ?  Any suggestions ?
>
> 73 de
> Hans , OZ5RB
>