Ok, Here's a new one for me, but perhaps one of you has solved it
already.

One of my Icom 751 transceivers is acting odd... The T/S button and DFS
button seem to do the correct thing, but I can't switch bands. Pressing
the band switch in causes the frequency to display at a much higher rate
than normal. (with the Band button in, the frequency changes so rapidly
that it appears to be about 1000 times faster than with it off.) The
frequency display moves through a given band, then goes to the bottom of
the band and repeats... You can't get the radio to move out of whatever
band it started in. At first, I thought the band button was broken,
before I realized that pressing it in causes the display to change MUCH
faster than when it is not depressed.

Also, pressing the RIT button or the XIT button causes the RIT or XIT to
flash momentarily on the display (as I press the button in, it happens
about half way down on the button press) but RIT or XIT is not
engaged...

The Ham/Gene switch also seems to have no effect. The radio display
just will not go beyond the band I happen to get when I turn on the
radio.

I pulled the standard Icom ram board and put a PIEXX ramboard
replacement in, (from a 751A that works just fine) and it doesn't change
the symptom, only the frequency range happens on another band.

OK, so have any of you radio gurus out there heard of this problem, or
encountered it and know of a fix?

I've googled for 751 mods, repairs, problems and spent hours trying to
find anything this way, and all I can seem to find are a few mods (some
of which seem to indicate that failing electrolytic caps can cause a few
other symptoms, but nobody has mentioned anything that sounds like my
problem...)

Thanks
--AH7H