[Elecraft] K-3 Saga Continued

[Pete Smith N4ZR]

So, after many hours of fiddling around, I had to give up on the KIO3B 
for the time being.  I made repeated efforts, being exquisitely careful 
to make sure all the board-edge connectors were properly meshed, and 
every time I came up with ERRIO3.  So at that point I pulled the KIO3B 
parts, replaced them with the original KIO3A parts, and the radio 
started up without any errors. I think I may have gotten a 
dead-on-arrival KIO3BUPKT, and have written to Elecraft. Transmit side 
seems to be fine - tested on a number of bands - as does the interface 
with my KPA1500.

One remaining crazy problem - the receivers, both the main and the 
sub-RX, are VERY dead.  Band noise doesn't move the S-meter on any band, 
and *almost* nothing can be heard.  It sounds to me as if what I'm 
hearing on either RX is probably the result of incidental coupling, and 
that it's likely that some shared RX signal connections is open.  Can 
anyone who is intimately familiar with the K-3 suggest which ones I 
might scrutinize?  I have the schematics but have not been able to 
relate them to the physical reality.

Thanks in advance

-- 
73, Pete N4ZR