RS-232 communication 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 fault or not? Any
suggestion on what to do next is much appreciated!
Thanks, 73, Per  SM0WRA .
K2 no 1623, K1, KX1


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