[Elecraft] K3 SubRX anomaly continued

[Pete Connors]

Gary,

I have now removed the front panel, reseated the aux DSP, replaced the 
front panel and reassembled with exactly the same symptoms.

This is the second time my K3 has developed a fault out of the blue and 
it is expensive (increasingly) to return things to Aptos for servicing. 
I would be grateful if we could localise the fault as closely as 
possible in order to work out the relative cost/benefit of returning a 
part for repair or buying a replacement. The latter has only a one-way 
mailing cost for me and keeps my K3 in service.

A further thought occurs to me: in 'external source' RF calibration mode 
the dsp is calculating the calibration data, and in 'factory default' 
mode the data writes to the dsp, so does this data *need* to be written 
to the EEPROM for calibration to survive power resets? Or is it just 
stored there for saving a configuration?

73, Pete F5VNB