[Elecraft] RS-232 failure KPA100

[Per Enocson]

My PC to KPA100 communication suddenly failed. Checked the cabling and  
did some initial tracing from J1 to U4. Seems ok incl. RFC:s. I found  
deviating voltages on U4 pins:
2		-5,5
3		-10,7
4,5,6	-5,5
7,8		-10,7

with remaining U4 pin readings ok.

Then tried to find the 16293 kHz signal on my SW receiver but couldn´t  
hear it. I however find  -75 V at the end of the diode chain.....so is  
the HV xtal oscillator at foult or not? Any suggestion on what to do  
next is much appreciated! Thanks, 73, Per  SM0WRA	.
K2 no 1623, K1, KX1