[Elecraft] Help please - Smoking K2 - no s meter or power controll etc

[Don Wilhelm]

John,

Is your K2 serial 3000+ ?  If it is, the control board changes for the KIO2
were already on the control board, and you would end up with 'strange things
happening' (I don't have the board layout images for the new board, so I
can't predict what the actual 'strange things' might be).

OTOH, if your SN is less than 3000, the control board changes are needed,
but they normally cause no problem with or without the KIO2 plugged in, and
I believe you said that you found that true after you re-added the changes
but before you plugged in the KIO2.

There is the off chance that you have something wrong (miswired) on the KIO2
that may have caused the same bad results as will happen if one uses a
standard computer serial cable plugged into the K2 (you DID use the special
K2 cable, didn't you).  Tom Hammond N0SS has a document describing what
might have gotten zapped - look on his website  http://www.qsl.net/n0ss for
the PDF file relating to this situation (Tom asks to please download the
file, do not view on-line).

73,
Don W3FPR

----- Original Message ----- 

> Greetings
> I have just built the KIO2 interface. My K2 has been fine until I came to
> modify my control board to add the I/O. I gor info 090. This led me up the
> garden path. I un modified the board and had a whole lot of weird effects.
> Finally I reset the K2 to its default settings and it worked. I then
> remodified the board and tested it and it still worked. I inserted the I'O
> board, switched on and smoke appeared I disconnected the I/O switched on
> again and I now have no s meter, now TX power control(although the display
> says it it changing the power) no ssb signal although I have full carrier
> power on all bands. The S meter Hi and lo calibrations do not work,
neither
> do the grph indications. I get no power indication on the bar display on
> transmit.  U6 is version 2.01.
> I do not know where the smoke came from. It seemed to be from thr RF board
> but I can see no sgns of burnt components.
> Any ideas greatly received.
> Extra frustrated due to having just completed (successfully I think )the
2M
> XV.
> 73