[R-390] Megacycle Change Stuck R-390

[Barry]

Hi Alex,

There are a series of "wings" on the shaft that determine where the stop point should be at both ends of rotation (I think those limit the shaft to just a tad over 10 turns end-to-end).  If all of those are completely stopped against each other, then that would cause this and the solution would be to loosen the clamp and adjust those stopping points.  If the stop point is reached but those "wings" can still be rotated slightly with your fingers (be aware there is power near that point so best to unplug the radio to try this), then something else might be a problem but I think the 10-turn stop is the problem.

Good luck,
Barry - N4BUQ

> Hi All,
> 
> I have an R-390 that has recently been restored.  It is performing very
> well, with one exception...
> 
> Last night I attempted to tune up through all of the megahertz bands all
> the way to 32 MgHz for the first time.  I got to '30' on the megacycle
> change knob, and the knob wouldn't rotate any further to 31.  I could get
> it to go slightly towards 31, but it was obviously stuck and I didn't want
> to attempt to jam it.
> 
> What would potentially be the cause for this being stuck?
> 
> Thanks,
> -Alex
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