[Elecraft] KIO2 just stopped talking

[Bob Whelan]

Hi
 
My KIO2 has just stopped communicating.
Osc is OK, neg volts -10
 
Volt checks look OK except for
 
U1 Pin 5 which is 13 should be -8
U1 Pin 12 is 0 should be 5?
 
BUT U1 pin 5 goes to the TXD line and thence to the control boards U6 pin 25, which is shown in the Manual as being at 0 normally.
 
Any ideas appreciated
 
73 and thanks for reading this
 
Bob G3PJT