Display image bigger than screen

We have a Mitsubishi VS-60707 rear projection and it works fine except the image displayed is bigger than the screen. Not a big problem but slightly annoying that we are missing the very top, bottom and both sides of the image- it is like the picture is too big for the screen. Very distracting for anything scrolling like the stock ticker etc. Is there somewhere in the menu to adjust the setting for how big the picture is?