[ICOM] Problem with IC-751a Display

[Marc & Tricia Niebergall]

Well it seems like I have narrowed down the problem in my 751a. It has
installed in it a Willco memory board, and when I re-installed the factory
board the problem all but disappeared. I say because there still exists a
problem tuning the 17 meter band. The Willco board is totally inop, so I am
thinking of replacing it with the Piexx brand. Before I do, I would like to
determine the cause of the 17 meter band not being able to tune. You can
spin the dial and it jumps to a 17mhz freq and then further spinning does
nothing. I am wondering if the previous owner installed the Willco board in
an effort to alleviate this problem, assuming it existed then. Lot's of
head scratching, but there is light at the end of the tunnel. Any further
suggestions are most welcome.

Marc

On Fri, May 18, 2018 at 11:06 AM, Marc & Tricia Niebergall <
mtniebs at gmail.com> wrote:

> Powered up my 751a today and everything worked fine. Shut it down and
> restarted about an hour later and the display indicated all zero's. The
> tuning knob had no affect. Neither did most of the other switches. Cycled
> the power a couple times and it returned to normal. Any idea where I might
> begin the troubleshooting process?
>
> Several months ago, I had a slightly different situation in the display
> where turning the tuning knob caused a very radical and fast moving
> display. This turned out to be a loose R-20 in the Logic board. A
> re-soldering of the resistor cured that problem.
>
> So, this is a new symptom and any assistance would be greatly appreciated.
>
> Marc-k7wxk
>