I also have a Sharp Carousel of about the same vintage as the OP. I don’t remember which year I bought it, but some time in the mid-80s. The last time I mentioned it here on the Dope, I said it was working perfectly. I regret to report that that’s no longer true.
Just in the last month or so, one of the 7-element digits on the display no longer displays correctly. The horizontal elements of the tens digit don’t light up as brightly as they use to, although the vertical elements are still fine.
So, time to get a new one?