[Elecraft] K2 NEED HELP TROUBLESHOOTING

[Don Wilhelm]

Rich,

I suggest you look closely at the connectors between the control board 
and the RF board for a poorly soldered or unsoldered connection.  
Especially pins 35 and 36 of control board P2 and RF board J7.  Also 
pins 1, 2 and 5 of control board P3 and RF board J8.  These latter AF 
control pot lines go to RF Board P1 pins 1, 2 and 3 and Front Panel 
board J1 pins 1, 2, and 3. 

The reason I suspect an unsoldered connection is that you caused the 
problem when you removed/re-installed the control board - and in the 
process, something moved.  An unsoldered connection can work just by 
physical contact for a while, but will break the connection if it is moved.
You can use your ohmmeter to check continuity along all these paths - 
use the schematic to see where the wire starts and ends up.

73,
Don W3FPR
RICHARD MC KINNEY wrote:
> I removed the control board as suggested in 065 of the guide.  Heard relays click as the book said.  But when I put the control board back in I lost Rx.  I know it worked good on 40 meters as I played with it a few days after alignment II procedure.  I can inject a signal on 40 meters and the s meter pegs out but it is just barely audible in the headphones.  The side tone audio is ok when I key.  It's like the Rx is muted.  I can touch pin 2 and 3 of the audio amp and hear finger noise.  This Rx problem is not from something installed wrong as it worked fine before I removed the control board.  Please somebody tell me I can just push some button and clear up the Rx problem so I can chase the problem on Tx.  73 Rich WB4VFN
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