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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 this is a belt drive then most of these speed increases are caused by the belt being in the wrong position. The belt could be faulty and my need to be replaced. Otherwise it could be due to a power supply problem, such as a faulty regulator to the supply of the motor. A check on the voltage to the motor will determine this. Assuming you know what the correct voltage should be! Of course with luck it will be higher than the motor is supposed to run at.
there are two small holes under the unit labeled 33 and 45 that control speed. im guessing youre mainly playing lps so use a flathead jewlers screw to adjust the 33 setting until you get the right speed
most platters are secured with a c clip in the middle --gently prying it off should allow the platter to be removed--than a little dexterity is required to reattach the belt to the pulley and around the bottom of the platter--if the belt is broken or stretched you can pursue a replacement at mcm electronics .com
I have a different Sony model (PS-LX-150H) that had a similar problem. I hadn't used it in awhile, and then when I did, I noticed the speed problem.
IF your PS-LX250 is like my PS-LX150, there are small speed adjustment screws accessible from the bottom of the unit. On mine, the two adjustment screws were labeled - one for 33rpm, the other for 45 rpm. Basically I just fiddled a bit with them using a very small precision screw driver until I could verify that I had reached 33 rpm (I used a stopwatch and literally counted the number of rotations/minute after making adjustments.)