[Elecraft] [K2] KIO2 Malfunction

[KT4G]

Hello Don,

Thanks for the insight.  I checked D4 and it seemed to be ok.  I went ahead
and removed U1 and the voltage on the D1 anode rose from -3.3 to -11.5!  U1
must be bad.  The only question is what made it that way?

I'm going to order a couple of 1406's from Mouser and see if that indeed
fixes the problem.  If the original chip suffered from a latent defect (in
other words, was the proverbial "time bomb" waiting to go off), then I
should be ok.  If the failure was due to another faulty component then at
least I've got a spare...

Anything else I should look for before I proceed?

Thanks again!

Larry, KT4G
  

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