I have seen this problem before. Lift the turntable off. It might be held down with a clip around the center pole. Under it you will see a wheel that contacts the turn table and the center shaft of the motor. The motor shaft has 3 0r 4 elevations with different diameters. When you change the speed the wheel will move up and down to different diameter levels on the motor shaft. It must be free to move. It might need some oil at the moving parts as I suspect it is not moving properly. Hope this helps.
Mine was playing too fast. After exhausting all options, I found a solution that worked perfect. My motor shafts that powers the belt is thicker in the middle and thinner above and below. The belt would always seek out the thickest part, no matter how I adjusted it. It played faster on that thick part and slower on the thin part. I simply shaved down the thick part a little. It took a couple of times, having to put the belt on and off to test it. I would let the motor run & used a sharp screwdriver to shave the metal drive shaft/rod down. It plays perfect now.
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Lots of quality turntables have a speed checker and a limited amount of speed adjustment.
Many ordinary record decks use a synchronous motor, the speed of which is regulated by the Hz of the mains supply and with mostly fixed gear ratios it is impossible for them to run faster - slower is the usual problem.
I expect there will be types driven by a dc motor and regulated by a switch mode power supply but I know nothing about them.
I suggest you begin by learning something about your turntable.
if your turntable doesn't have a pitch control (like the dj's turntables) if you open it you should find on the board close from the 45-33 rpm switch a variable resistor ( a small electronic part with a sort of disc on top with in the middle of it a place for a flat screw driver and marking like + and - those resistor are made to control the speed and can go bad or just need to be adjusted . First try to adjust it turning the dial really carefully with a small screw driver if nothing happened it could need to be replace.
Hello the turn table has two speeds. 45rpm and 33rpm (rotations per minute) If you are playing a record that takes up the entire turntable you need to set it on 33rpm. For the records that only take up half of the turntable you want to set it on 45rpm. Setting the turntable on the wrong setting for a certain size record can make the record play to fast of to slow.
If it is a belt drive model it might be that the belt is out of place and therefore causing the speed to be wrong. This might be due to age or wear of the belt. I would look at that before adjusting.
If it is good and you can't see any mechanical fault causing it. Then look for a preset pot (or two) on either the pc board or on the motor itself. They will adjust the speed. If you find two - one will be for 45 they other 33.
Bear in mind the motor might have gone wrong!
It could be the wrong drive belt if the turntable is of the old fashioned type and does'nt have the direct drive. If the 33/45 switch isn't working properly then its a possibility its the drive belt tension on the turntable.