[Elecraft] KIO2 quit

[Don Wilhelm]

Norm,

Do you have CW sidetone?  Switch to CW and press SPOT to check.  If 
there is no sidetone, you likely have the sidetone source incorrect.  
Enter the menu for ST L and edit the parameter - then tap DISPLAY until 
you hear sidetone, then stop and exit from the menu.

U6 pin 25 used to be the source for sidetone but that was changed to 
U8-4 when the KIO2 (and KPA100) needed to use U6 pin 25 for TXD.  The 
firmware supports both sources so the older K2s without the sidetone 
source mod will work with the new firmware - however this capability to 
support older K2s does have its downside - sometimes the sidetone source 
is inadvertently changed and neither the sidetone nor the TXD signals 
are correct.

If that does not fix it, ask again please.

73,
Don W3FPR

Norm wrote:
> Hi All,
>
> My K2, KIO2 quit.  I traced the problem to pin 25 on U6.  It has 2mV 
> on it,
> (should be 5V).  Any one have ant idea where to look from there?
> The rest of the radio seems to be working properly.
>
> Thanks, Norm
>
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