[Elecraft] KIO2 connection with computer

[Pierre Vallee]

I installed the KIO2 about one year ago.  It worked fine.  I now have a problem with it.  I can't get a connection between the K2 and the computer using the K2 Remote V1.0 Beta program.  The computer com1 setting is fine and the K2 port is ON.  In testing the cable between the K2 and the computer with a line tester, I get a "no reading" on pin 2 .

In doing the voltage checks for U1, I find readings of 12.77v on pin 5 (should be -8) and 0v on pin 12 (should be 5).  I believe the circuit diagram shows these pins being part of the transmit circuitry (pin 2).  Could U1 be my problem?  Any suggestions.  Thanks

Pierre