[Elecraft] Help needed KIO2 AUX I/O Module

[Martin Kemnitz]

Hello Elecrafters

We have built up the I/O module for the K2 but it doesn't work. We have
upgraded to revision 2.01 h firmware and made all changes on the control
board. All functions are running fine but not the RS 232-module. With the k2
remote program we get no connection. In second menu the port is switched to
ON. We have measured on pin 25 of U6 on control board, there is no voltage,
but it should be 5 V. We have controlled all connections, all seems to be
ok. The connection between Q5 and pin 25 on controll bord is cut, a new
connection between Q5 and pin 4 of U8 on the controll board is also made.
Is the microprocessor U6 broken or something wrong with the programming?
Thank you very much for your help
Martin, DL7IE and Manfred, DH7ADW
vy 72/73