Fruit Dehydrator - Looking for Better Results

I bought one of those dehydrators at a garage sale and of course no directions on how to use it. I have searched online with no luck. I have been trying to make dried fruit and I just cannot seem to get it right. I guess what I am really asking is will the fruit ever be as dry as the stuff that you buy in the bag? Most of my stuff ends up chewy.

You bet this helped - thank you