press and hold the sel button for a few seconds until one of the psm (prefferred setting mode) on the display. use the ff/rw to choose which psm you wish to adjust use +/- to adjust then press sel several times to scroll through psm settings and exit to normal sound control settings.

I had the same radio, purchased new only a few years ago but had to look up the manuals to reset the clock. books.jvcservice.com/download/718142047/32311.pdf If that is not the exact model or if yours looks a bit different, try this link for other similar search results... books.jvcservice.com/booklist.asp?Model=s10

try www.crutchfield.com