Platter not spinning properly

If your Pioneer PL 640 turntable is experiencing variations in speed, there are a few potential causes to consider. Here are some steps you can take to troubleshoot and fix the issue: Check the belt: The belt on the turntable may have become stretched or worn, which can cause variations in speed. Inspect the belt for any signs of damage or wear, and replace it if necessary. Check the platter: The platter may be dirty or have accumulated debris, which can cause it to spin unevenly. Remove the platter and clean it thoroughly, and make sure it is seated correctly on the spindle. Check the motor: The motor may be malfunctioning or dirty, which can cause variations in speed. Remove the motor and clean it, and check it for any signs of damage or wear. If necessary, replace the motor. Check the pitch control: The pitch control on the turntable may be dirty or malfunctioning, which can cause variations in speed. Clean the pitch control and make sure it is working correctly. Check the power supply: The power supply may be providing insufficient power to the turntable, which can cause variations in speed. Check the voltage output of the power supply, and make sure it is within the manufacturer's recommended range. If none of these steps resolves the issue, you may need to take your turntable to a professional repair technician for further diagnosis and repair.

Is it just the matt that records sit on that's the problem or the whole platter?
If it is the matt you can peel it off and get a new one from somewhere such as as Amazon. It doesn't have to be the same brand as the turntable as long as it fits on.
Just search for "turntable matt".
If the platter is the problem it might be caused if the platter is plastic by either a chemical or heat warping the platter. Has it been exposed to the sun for example? Some chemicals such as oil and polish can cause it to bend out of shape.
It's likely if the platter has warped that it will need to be replaced.

The platter should be level. If it is not then it could either be warped, by oil, heat affecting in the past. Or just faulty. Even if a warped turntable plays a record OK, it could damage it, as it is so easy for a record to be damaged, it could cause a scratch on the record. It should be checked out.

Well, you have the rotor, which has above the conus where you put your platter on. But the rotor needs to be kept in space, so it can spin,
which offcourse in the is done by (too soft) bearings, but the bottom of the the rotor(which looks the same as the 'pin' where you put you vinyl on, just leans on a piece of metal, instead of a technics where it falls in a shaft too keep it is place.
You undestnd that the strength on the bearings of a st150 is much higher, especially when scratching. Besides that, the high torque works 0,2 sec and then an optocoupler samples the speed of the rotor. And it's easy:on the underside of the rotor ,there's a plastic round disc puled over the rotor and kept on his place by a plate and 3 screws, with on the outside just

Your turntable belt is off. Remove the c-clip holding the platter to the center spindle. Remove the platter and turn it bottom side up, place the rubber belt around the platter and fix it to the little post sticking up on the outer-edge surface. The little post holds the belt to the platter while you turn the platter over and put it on so that the post points right over the motor pulley. Turn the platter by hand either clockwise or counter-CW and the belt will pop off of the post and land on the motor pulley. One drop of oil on the center spindle for lube and fasten the e-clip back on. Of course, the tone arm might not be actuating the power switch, you can address that with the platter off as well. Good Luck.

Do you keep the platter at one place --> don't you let the platter spin and keep the record at. one place, you are know f.5;5,g your engine and parts.... buy suzuki slipmats and use the plastic rounds of plastic .... i thought by thud rumble too let your table spin when you hold the the platter, otherwise components get to hot

If you can turn the platter easily by hand, then so should the motor. You can also disconect the power leads to the motor and hook up a PP9 9 volt battery to it. If it\'s slow and easily stopped from rotating then there\'s nothing wrong with the power to the motor and the motor is bad!

sliight wobble is normal but if its something you notice i suggest sending it to them to fix it

Sometimes you can push down on the platter high side to bend it gently to get it to turn level. Being brand new, you can also return the unit for repair or replacement at no cost. The cost of these things does not justify putting up with defects like this. Good luck!

There are two motors with beige/tan plastic covers over them, one on turn table platter and the other on the record changer mechanism table. Take the cover off the one on the turntable and spin the motor by hand. Depending on how you spin it the arm will either go back up or down