Easy. Switch it off, lift off the platter carefully and this will bring out the rubber belt too. Otherwise lift off the platter cover, look through the holes and lift the belt off the motor's spinner. Then lift off the platter.
John T, March 2007
I know the folks at www.1200s.com can probably help you. They walked me through the installation of a belt on my Technics SLB2. Not even Panasonic/Technics had any clue as to what I was talking about, and they made the damm thing!