The binary number that the B represents may provide some insight.
On Aug 8, 2016 11:25 PM, "Gary J FollettDukes HiFi" <dukeshifi@comcast.net>
wrote:
> There is some new information.
>
> The A/B switch, when held for 2 seconds, is supposed to change the “A” or
> “B” on the display and this in turn makes the band select buttons select
> the band directly. It is supposed to default to “A” I think. Mine defaults
> to “B”.
>
> If I wait the 15 minutes, and the encoders start to work, I can use the
> A/B to select “A” but upon restart, the default becomes “B”, which is
> incorrect.
>
> I think the 15 minutes, a rather consistent number, may be a timeout for
> the interrupt lines.
>
> It would appear that something is pulling the A/B switch line low, but it
> is not the switch itself. The switch works fine once the timeout takes
> place.
>
> I am now looking at the 74HC154 4-to-16 line decoder/demultiplexer.
>
> More to come…
>
> Gary
>
>
>
> > On Aug 8, 2016, at 3:29 PM, Stuart Rohre <rohre@arlut.utexas.edu> wrote:
> >
> > Gary, before you shotgun all the capacitors, look at all the solder
> joints for the affected boards with a high intensity light, and a
> magnifier. A head mount magnifier with light may work, but I often use and
> independent high intesity Halogen light we bought for troubleshooting.
> >
> > I am betting on one or more bad solder joints. How old is this radio?
> Are you the first owner?
> >
> > Stuart Rohre
> > K5KVH
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