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If you have access to an oscilloscope you should find a 500Hz sine wave on P1 of the motor connector when the speed is set to 33. It’s possible that the motor control chip has been damaged. Check the schematic available at https://beomanuals.com/manuals/Beogram/Beogram%202402/Beogram_2402-Schematics.pdf. While its a different model it uses the same motor control circuit.