I have the same problem with my Infinity 1000 and a couple other radios as well. It has been more than 15 years since I used my RC equipment, and now that I am trying again, I have found that a lot needs to be fixed.

I think the problem with the sliding trim is that the pots have bound up. I think it is because the lubricant has turned to glue. I was able to turn one of the pots with a screwdriver to free it up, but it still feels like a stick in the mud. I just ordered some Isopropyl Alcohol to clean them and see if I can get the radio back to working condition. If the cleaning doesn't work, then I will be looking for replacement pots to see if that route works.

I have a Futaba -T7UHP Super radio that both gimbals have frozen up. Probably the same problem.

Anyone else had any experience with these types of problems?

Thank you,
Ray