I also changed now the worn servo belt. I know it has nothing to do with this problem but all belts are changed now. I suspect that there are 2 possibilities, Drive motor is worn, or the voltage of drive motor is not stable. Dont know about is there any signal/control line in motor connector. The platter is adjusted high(see photo). Could measure the voltage with oscilloscope if I had one(multimeter resolution/speed is not high enough). Maybe dismantle and solder all on pcb like on that CD player when it helped…dont know.
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