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Kenwood TS-940S Dot display problem, PLL out of lock.
Phase Lock Loops (PLL) going out of lock.
Dot display problem is a Common Fault on the TS range, google and you will find lots of repair ideas.
My fix based on visual inspection was to re-solder all the joints on the underside of the Digital A-unit and the PLL board then clean and re-seat all the connectors on both boards.