[Elecraft] K1 no power out B2

[Mike Morrow]

> As the prior poster has suggested, the RF board path from from P1 pin 2 
> to U7 pin 4 is suspect...

Not really.  That's the band 1 path, for which satisfactory performance was reported.
 
> ...as is the path between P1 pin 1 ans U7 pin 5.

Which, assuming the fault does not stem from the same unlikely pathology on both filter boards, still seems most probable (although P1 is on the KFL1-2, so J6 on the RF board is more accurate).

You could substitute the KFL1-4 from your other K1 to see if this or related problems show up.  The four-band board couples the pre-mixer tuning circuit differently than does the two-band board, using U7 output from *both* pin 4 and 5 together on all four bands.  A problem with the U7 pin 5 path on the K1 could show up on all four bands rather than just band 2.

I would not worry about the K1 zapping the KFL1-4.  The MCU is the only chip and it is obviously working on all your KFLs.

Mike / KK5F

I would not worry about anything coming from the K1 zapping anything on a filter board.  The filter board