[Elecraft] K3 no power out

[Ian White]

G3PJT wrote:

>Just an update on the no power  problem I reported last month.
>After checking a series of RF voltages using a checklist from Gary I 
>located the problem as no RF from the KREF3 board at J65 I then removed

>the KREF board and all the cables, inspected board and re assembled the

>KREF3 and reinstated the cables.
>Since then the problem has not recurred.
>So it could have been a poor contact on the KREF3 cabling. It was not 
>downstream of the KREF3
>

There have been problems caused by intermittent contacts on some early
series of the TCXO modules, which are a less than firm fit in the
turned-pin socket. Also the nylon cable tie supplied during this period
was too stiff and did not pull both ends of the module down firmly onto
the socket.

I had this problem twice. First time around, I bent the pins on the
module slightly out of line and pushed it back into the socket, and that
seemed to cure the problem. I also replaced the single cable tie by two
very slim ties, inserted under the socket from opposite directions so
that both ends of the module could be pulled down firmly.

That worked for several months but then the problem came back, so the
second time around I thickened the pins of the TCXO module with a little
solder to make them a much firmer fit, and of course replaced the two
cable ties. Two years later (maybe three) it now seems fine.


73 from Ian GM3SEK



73 from Ian GM3SEK