What does it output? Volts, amps, AC/DC?
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It appears to be a very simple unit, either AC out or DC out, no matter, still very basic.
Repairable or replaceable, is what it appears to be. Not at great cost to replace or repair, either.
The user manual at vinylengine also includes the schematic for the power supply box and the schematic for the internal speed control circuitry on the table proper.
It may be the speed control circuitry acting up and not the power supply box, as the power supply box has no capacitors to dry out and precious few contacts to get dirty. The internal board on the table is very suspect, when it comes to aging issues. Lots to go wrong there, when it comes to aging issues. Which this table, unserviced, will get into. (common for this sort of circuitry at this sort of age point). The connectivity can also age and need some contact re-stressing and cleaning.