Marantz CD72 (CDM4/19 TDA8808/TDA8809/SAA7310) skipping/drop-outs issues

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Despite a laser diode in good condition there are sometimes (not always) drop-outs and skipping to observe.
Surprisingly there is no response to vibration (no sensitive against beating on top or on site from the enclosure while playback.
RF-signal looks also very good.
All electrolytic caps are replaced on the servo board.
How can I check the motor of the CDM4/19 ?

Thank you for advices
 
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