Harmon Kardon T60C Turntable issue

I pulled out my HK T60C turntable which had been in the attic for the last 15 years. The belt was melted which I replaced but the speed seems to be stuck on 45rpm. I took it apart and cleaned the contacts but still no luck.
I thought it might be the new belt but it appears to me that drive spindle is not adjusting speed. Any thoughts
Vinylengine.com for manuals etc.
Clean the switches for speed and quartz lock with switch cleaner.

noromance is spot on.