JVC QL-F4, direct drive quartz lock. The speed is no longer correctand runs fast after my young son thought it would be fun to stop the platter several times. After replacing the stylus that he snapped off,I found the speed problem. Can this be repaired. The motor appears to function properly so I suspect there must be a speed control somewhere but it couldn't be found. Now, I suspect "quartz lock" means, electronic speed control. Can anyone offer help or is the TT toast?