[Kenwood] TS-430S USB/LSB receive stopped working

Fri Jun 15 14:41:48 EDT 2012

I have had a TS-430S for some time. It is used almost 100% on CW.
Recently I discovered that receive on USB/LSB is 9 S-units down from
the sensitivity on CW. This must have happened some time since last
Field Day.
I am aware of the fix for poor relay contacts. However, I don't see any
relays in the schematic that would seem to be related to SSB selection.
The next step would be to measure the control voltage on the PIN diodes
that do the filter selection, I suppose.
Anyone encountered this problem before?
73, ian K3IMW