[Elecraft] Lack of AF output...

[Tom Hammond NØSS]

I wrote:

 >Well... shoot!

 >I just managed to KILL ALL SIDETONE from my K2 as I
 >was just about to begin taking readings...!

 >I thought I might have accidently shorted Vcc (U9-7)
 >to Bypass (U9-8) as I was probing U9-8 for a measurable
 >drive level... however, the problem appears to be MUCH
 >further up the AF chain that that... I see no output
 >from U8-4 (the DAC which generates the tone when the
 >KIO2 is installed). And yes, I've already confirmed
 >that the MENU item for U8-4 sidetone source IS selected.

 >RECEIVED signals still work, so I think that U8 (LM380N-8)
 >is still working, thoung I've not tried to forcefeed
 >audio into the Bypass input, which is where the sidetone
 >is applied.

 >More later. One slip... only little lousy slip... Grrrrr!

DISREGARD EVERYTHING I JUST WROTE (above)...

I just stumbled back out to the shack, turned K2 back on,
Hit MENU ST L and voila(!)... SIDETONE...!

NO CLUE why it failed before, and why it self-healed...
I'm pretty confident of no cold joints, etc.

Anyway, back to testing...

Man, I just LOVE MAGIC!

73,

Tom  N0SS