Technics SL-D2 platter is spinning too fast. Help

Hello, I recently acquired my brother's Technics SL-D2 Direct Drive Turntable. Upon powering up the unit, the platter is spinning too fast (any record sounds like Alvan & the Chipmonks). The moving the 33 / 45 switch as no effect & strobe Sync light is on and is steady. The pitch control knob has no effect on slowing down the platter. I've have used contact cleaner on the switch and pitch control to clean the contacts, with no impact. Any ideas?