Most likely the belt has come off or is worn.
To replace a drive belt.
Before starting unplug from mains power source.
1, Remove the rubber platter mat to expose the platter.
2. Put your thumb and forefinger through the two round holes and lift the platter off. You may need to give the centre spindle a light tap (whilst applying upward pressure) with a screwdriver handle or some similar tool that will not leave any marks or damage.
3. Remove the old belt and wipe the platter pulley and motor pulley with an alcohol swab to remove any old belt residue.
4. Place the new belt around the platter pulley making sure t is sitting flat without any twists.
5. Flip platter over the right way up. There are1or 2 larger rectangle shaped cut outs in the platter.
6. Through the cut out pinch up the belt and slip a finger or belt hook between the platter pulley and the belt gripping the belt ready to fit over the motor pulley.
7. Align the centre hole of the platter with the spindle and place platter back into position keeping a grip on the belt.
8. Slip belt over motor pulley and give the platter a light clockwise rotation to ensure the belt is riding correctly.
9. Replace the rubber mat and then run the turntable to ensure correct operation.
Job done.
SOURCE: Sony PS-LX250H turntable won't turn
I have the same trouble so I gave it a push and after manually spinning the table and then putting through it's sequence a few times it worked fine!....but now it's started to run at a speed half way between 33 and 45rpm. To see if its just a stuck motor, remove the table lift the arm move it over so it's trying to drive then just rotate the pulley clockwise between finger and thumb.
SOURCE: new needle for sony ps-lx250h?
I have the same turntable and I just bought a replacement needle through the needledoctor.com. The needle is made by Audio Technica and the part number is ATN3600L.
SOURCE: Sony PS-LX250H speed problem
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.)
Now it sounds right!
SOURCE: how do i replace belt on lx250h?
Not sure about yours, but some of these one lifts the rubber pad to get access to the belt through holes in the platter when you are re-installing to get the belt back on the hub it runs on. One usually has to lift the platter off to get the belt around the center hub and the motor pulley first..
You can probably find the belts online with a Google search.
SOURCE: I push the start button and no power
You need to check if any internal fuse has blown. Next the switch itself might have broken.
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