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It's possible your weight adjustment has been mis-adjusted since you last used your turntable. On the tonearm, there should be a weight adjustment wheel. Turn this all the way towards the needle (IN). Now, adjust it backwards until there is no resistance in the tone arm - this is your zero point, reset the wheel on the weight adjustment knob to read 0. Now, adjust it forward to 3 grams of downward pressure. This is usually the minimum amount of force needed on a record. If it still skates at this setting, adjust it with gradual amounts of greater force until the skating stops.
If the turntable is belt driven you may have a stretched and slipping belt that needs replacement. This seems most likely and is simple to fix. You will have to lift off the turntable to see the mechanism beneath. It may be held on by a nut or clamp. A web search for the model name and "dirve belt" may yield a replacement.
If it is driven directly by a motor without a belt, the motor is probably dying. Replacement more involved, expensive, and hard to justify, unless you're really into vinyl.
I had the same problem & came up with this solution. It is very simple.
Take the platter completly off the turntable by pulling on the nipple in the middle of the platter. If you are unsure what the platter is it is the base that the record lies on. It may take a good pull to get the platter off.
Take the belt completly out of the turntable. On the underside of the platter you will see a large circular lip. Wrap the belt around the exterior of the lip. Make sure that the belt is flat & not twisted.
Inside the turntable you will see a large round white gear. On the edge of this gear you will see a semi circle cut out of it with no teeth on it. Align this groove facing front & center of the unit. You can feel it pop into this natural position.
Take the platter & on the underside you will see a small white gear in the center. On the bottom edge of the gear you will see a square notch. This square notch needs to face the front & in center of the unit.
On the inside of the turntable there is a small white wheel on the right side near the record player arm. This is where the belt has to wrap around. This is the motor.
Take the platter & sit it on your lap with the underside facing up. Align the square notch that's on the gear so it is facing 12 o'clock. Pinch the belt at 3 o'clock and pull it a couple inches away from the lip.
Now flip the platter over & be prepared to install it in the unit.
With the belt pinched away from the unit slip the pinched portion over the the small white wheel that is the motor. Put the spindle that is in the center of the platter into the center hole of the turntable. Make sure the belt does not get twisted & that the belt is still on the outside of the lip not getting pinched or hanging off. Remember to keep the square notch that is on the the underside of the platter facing front & center. This step may take a few tries so just be patient.
Now push the center of the platter all the way down as far as it will go.
It's a bit after Jim's post, however I had what appears to have been the same problem with my LX770 after it had been stored in the loft for quite a few years.
I found the problem to be caused by the tone arm mechanisms stalling - The band that was associated with lifting the arm had turned to a black gunge and was not allowing the motor to rotate, also the motor associated with moving the arm backwards and forwards was struggling to turn.
I cleaned the tone lifting pulleys and replaced with a small elastic band (for a temporary fix). This was a little fiddly as you have to take off a spring and a couple of gears to get the new band in place. I cleaned the runners and cleaned off the grease on the worm gears associated with the arm tracking (as I suspected it may be more viscus than originally installed), lightly oiled the tone arm tracking gears. It still seamed to take an amount of helping the tracking arm gears until they were able to move freely. With the tone arm mechanisms working properly the whole unit now seams to be working.
Top tips if you attempt this:
WARNING - If the unit is plugged in, the transformer and high voltage wires are live regardless of whether the on button is on or off on the front of the record deck. PLEASE do not take any of my comments as recommendation you should ever do anything with the unit plugged in!
Remove the little stylus carrier before you start taking the player to pieces - saves damaging it!
Remove the record mat and aluminium platter before turning the unit upside down.
Manually push the tone arm to about 0.5cm from its furthest travel - so you can remove the tone arm mechanism plate. May be a little stiff as the wires have to slide of the pulleys for the tone arm to be pushed.
To access the tone arm mechanisms, remove the main bottom plate (and greasy spring), then undo the screws which hold on the rear undertray. With the decks buttons toward you, you should then be able to lift the rear tray slightly and tilt the tray towards you to expose the tone arm mechanisms.
You shouldn't need to remove the circuit board with the control buttons on the front of the unit.
After getting it going, I found that I needed a Phono preamp to get the signal strength necessary to use the deck for transferring vinyl to my PC.