Crown Audio by Harman

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I am using a 10k potentiometer on the USM-810 Control Port and it is not working.

Verify proper control assignment and check the wiring. Early manuals had an incorrect drawing. One side of the POT. should have the +10 volt supply and the other should be the ground. The wiper of the POT. should be connected to the proper analog input on the 37 pin Control Port.