Vertical Height Parameter

I've a JVC AV-48WP30 projection set with vertical stretched just a little beyond CNN's scrolling text that I need to resolve. I'm in the sevice menu with choices 1 thru 8 I believe? Any who, where do I find the vertical size parameter? Not familiar with this service menu, have done tons of RCA's and other intuitive menu's but not this coded one. Can you help me? Cheers, Steve