[Kenwood] TS-930 Sensitivity

[Jim Dicso]

I have sensitivity problems on at least two bands in a TS-930 (one of two that I have in the shack).

I've followed the previous work on improving TS-930's and planned to replace suspect PIN diodes.  However, I couldn't resolve part #'s from PDF versions of the Signal Board so I was testing all the suspect diodes with a digitial multimeter and signal injection and range switching.  Unfortunately, in order to reach all the test points (and to replace the diodes), it looks like lot's of screws and cables need to be removed.  

I took a step back and measured sensitivity on both units for all bands using an HP 8640B and min discernible signal (speaker).
....somewhat subjective but questionable readings were doublechecked.   Originally, this test produced low (approx -75db) sensitivity on 18.1 and 14.2 Mhz but this comparison produced no readings higher than -125db.

Has this problem surfaced because of thru hole problems?   (I could have changed the contact by probing)

Is this now an alignment problem?  Will BPF tuning help me get to the -135 dB/-140 dB sensitivity I found on many bands?

Thanks, Jim K2SZ