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Original Message
There is a coded strip on the inner circumference of the platter.
Posted by Opus 104 on December 4, 2011 at 10:51:45:
It is "read" by a magnetic pickup head (looks like a tape head). If this head gets dirty, platter speed will be irregular or stop altogether. If cleaning this head (use denatured alcohol or tape head cleaner)does not restore operation, the problem could either be bad capacitors or, if you are really unlucky, the main IC. This integrated circuit is no longer made and practically unobtainable.
Good luck.