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Was the unit moved with discs inside of it right before this problem?
The next step would be to remove the case cover and then try to start a disc and watch what happens, does it take the disc from the tray into the drive? Does it then spin the disc up? Inspect and note exactly everything it does and let me know.
Yes, the table should be belt driven, you will need to visually inspect the belt and check the drive motor, if drive motor is getting correct voltage but not working then the motor needs to be replaced.
Yes, remove all discs from the unit first to prevent damage to the unit and or the discs.
Service manual: Nowhere can I locate a free version:
If you need any further assistance just let me know.