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If you have the old one measure the diameter in MM and then the thickness. Then put the diameter and the words "Record Deck Belt XX MM" into Google. Check the results and narrow it down using the thickness measurement. You don't need to be spot on with the diameter measurements.
Getting drive belts is easy, fitting them is the problem. If it is still attached in any way make a note or a photo of how it is fixed. This will help to putting a new one on. Measure the diameter of the old belt in mm. You will also need to measure the thickness in mm too. Then put these words into Google: "Turntable Belt xx mm" (use the diameter measurement in place of the XX). Then search the results looking for something that is very close to your belt. If you find the belt, try searching again for the fitting of it. Quote the model number of the turntable. The fitting instructions might even be found on this site.
Try moving the tone arm lever to raise the arm, if it has one.(MAKE SURE YOU HAVE RELEASED THE ARM CLIP!) Then with the arm raised move the arm over towards the platter. If platter still doesn't rotate, and its a belt drive, A. The belt is bad. or B. The belt has come off the platter or motor pulley.
These replacement parts are purchased for the model turntable that they are to be installed in. They are not generic and are not bought by "size" as say a fan belt for a car would be. I googled "Sony PS-LX300H Belt" and got:
sounds like your belt came off, if problem persists you will need a new one.
above is a generic video that applies to almost all belt driven turntables including yours that will show how to install the belt and a few other things.
Remove the rubber mat and you will see two holes in the turntable. Put your fingers in these holes & using equal force pull up to release the turntable. The drive belt goes around the metal disk you will see below and around the drive pulley. Most likely it has just jumped off the pulley so hook it back over. Replace the turntable and gently rotate it a couple of revolutions, you can see the belt through the holes in the turntable. If all is seated OK power up & enjoy!
You can download the manual from the link below:
This shows the procedure as per original install.
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