The Turntable belt may have perished or come off the motor.
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Unplug the unit and take off the record clamp.
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Using 2 small screwdrivers, put them in the hole where spindle is and unscrew (it may be an opposite thread so try to tighten first). and then remove the spindle from the turntable.
Remove the circlip and you can remove the platter from the unit.
Check the condition of the belt. The TT was made by BSR, knowing the age of the belt, even if it isn't perished it may be worth getting a replacement.
As you have gone this far, you can put some light grease on the spindle and some light oil into the motor spindle.
In the rear of the platter is a white peg, put the new belt around the outside of the inner raised circle and then onto the peg, it may be worth using tape to mark the location of the peg on the front of the platter and the location of the motor on the unit.[br]
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With the belt tightly fitted on the back of the platter, line up your marks and manually rotate the platter. If it bounces back then you have missed the motor, if you have been successful the belt will then come off the peg and onto the motor.
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Replace the circlip.
Replace the spindle cap and make it just tighter than finger tight.[br]
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Plug in and test your work[br]
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It has been over 20 yrs since I last did one so I hope I didnt miss anything