[Elecraft] K2 : 8T rise and fall

[Luc Favre]

I have an heavy trouble with my K2/100. During last french contest in SO2R setup, I made a mistake and keyed the K3 with the K2 still on the same band. I heard a strong noise in the K2, saw smoke and the TX was dead. RX OK. I've just replaced the 2 low level PA transistors : they were broken, both electrically and physically.
Now the K2 has following behaviour : pressing TUNE, the PA collectors current rise very shortly, then fall. After 1 or 2 seconds, depressing TUNE has the same behaviour. I measured the 8 T line and the 8T voltage follows the same law. Suspecting any processor error, I made a reset (456POWER). No change.

Any idea ? Where sould I focalise my efforts ?

73
Luc/F6HJO/HB9ABB
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