Well, it is possible you got some RF into the unit, but they are meant to
operate in an RF environment. And I do not believe in coincidences, but this
one is worth a try.
The indicator is run by a DC motor driving a gear reduction system through a
belt. The Overlap LED is told to illuminate by the control box (not the
rotor). As I remember, my older 800 has a cam geared on the gear unit that
a switch to indicate overlap. My newer, 1000, uses a comparator that reads
the position pot inside the control unit (also rotated by the gear reduction).
A slipping or broken belt or an intermittent motor (they are brushed PM
units) will cause all sorts of erratic and confusing dial behavior. I had a
go bad, and it too, would sometimes run under transmit. I cannot explain why
it did so; the brushes were bad. But it did.
Worth a check.
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