Why is my control dial not working?

Why is my control dial not working?

I recently got this camera a few days ago from ebay and I the issue is that the control dial value set at one value or if the dial is moved it goes up one value or down one value but no more. I have tried all I can think of like cleaning the contacts… Also, I have a nex-3n and it has no issues with the selp1650 lens, so I gather the control dial is to blame.