How do you fix the RPM speed on your record player?

To fix the RPM speed on your record player, first check if the player has a speed selector switch for 33 1/3 and 45 RPM; ensure it's set to the correct speed for your record. If the speed is still off, use a strobe disc and a strobe light to measure the RPM accurately. Adjust the speed control, if available, until the strobe pattern appears stable. If the issue persists, consider cleaning or replacing the drive belt or checking the motor for any mechanical issues.