[CQ-Contest] TS-930S tuning problems

[KW8N at aol.com]

Has anyone had erratic tuning knob frequency control on the TS-930S.
I have one that does and have even replaced the VFO board with one of those 
that supports computer interface (although haven't used the computer 
interface portion yet).  Problem persists.  Also cleaned the chopper wheel 
and optical devices.

Please respond to kw8n at aol.com

TNX, Bob KW8N