If you are unsure whether the turntable is playing at the correct speed, you can check it with this App.
Android https://play.google.com/store/apps/details?id=com.AM.AM.RPMSpeed&hl=nl
Apple https://apps.apple.com/nl/app/rpm-turntable-speed-accuracy/id1030889902
Some models can be adjusted at the bottom of the turntable, other models unfortunately need to be adjusted by the repair centre.