[Elecraft] RS232/ U1/ failure

[Viggo Magnus Nilsen]

Hello Elecrafter's. 

My K3/ SN218x have some trbl with the RS232port. 

I have my K3 remote controlled by K3/0 mini. via Remoterig. 

When the K3 is  in cold room ( below 5 degrees S) my K3/0 go  in TERM
mode. 

Hints say ''replace'' the U1 on the main KIO3 board.......... 

Is the U1 SN75C1406 ( G4) ? Or can I use similar SN75 ? 

Removed the top cover,and checked voltage , at gold plated test-point 
close to the upper edge 

of the main board +5.0 vdc. In the lower end of the SN75, test point at
the left side,seen from the front,, 

start with approx + 0.35 vdc, and drops slowly to approx -0.50 vdc in 4 
to 5 minutes.... 

My K3 need ''warm up'' also for connecting via PC to K3 utility.... 

Hits welcome :-) 

73' Viggo  LA9NEA