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Most of these motors run on about 9 to 12 volts DC. You can connect a 9 volt battery to the terminals of the motor. Make certain the rest of the system is off and the motor power leads are not connected to the main system. If the motor doesn't turn with the battery it's faulty. If it does then you are perhaps looking at some switch that has failed or the power to the motor itself!
Listen carefully with your ear to the turntable when you move the tone arm towards the record. If you can hear the motor running and the turntable is still stationary then the drive belt from motor to turntable has probably fallen off of broken. Lift the turntable, there's normally a metal clip holding the turntable in place, and locate the drive belt.
Sounds like you probably have a stretched belt on the load motor. Unplug the unit and remove the case which will expose the load motor. Plug in and turn on and press tray in button. You should hear the motor run and if you can see the belt you should see it slipping. Some belts are easy to change, and some are next to impossible. If you have to disassemble anything be sure that you note the position of everything as the timing of the tray, door, laser and most items in the unit is very critical. Let me know if you need more help.
After removing the rubber mat, you should see a clip on the spindle that keeps the turntable on. But you will still not be able to remove the platter until you remove the unit from the cabinet. Remove the bottom cover and flip the two clips and the turntable assembly can be removed.
If its a direct drive turntable the motor could be "blown",
or motor electonic speed controller burnt out.
If its a belt drive turntable then the belt could be broken
or stretched and is slipping, or the belt can have dropped of a drive pullety.
Also there are speed control mechanisms to adjust the final speed of the
turntable to the recorded speed of the record like 331/3rpm, 45rpm 75rpm
These speed reducing mechanisims can slip and cause the turntable not to turn..
There are also other mechanical bits that slide and push against each other,
and these can get sticky and the friction increases so much that the power
from the motor drive causes the belts to slip, so you need to identify if a
friction problem exists as well..
If you are carefull you can look your self and find out which one of the above it is.
Be warned there are lethal voltages inside the turntable which can kill you....
so please dont have the power on when making any inspection or adjustments.