Annoying noise when XEROX 6515 is in idle state

Hi - 

right from the beginning, when the the "Xerox WorkCentre 6515 DNI" is enterin the idle state / not printing after defined priod of time, an very annoying noise comes up. It is disturbing and if there is no solution in place, I will withdraw from the contract.

I am not a Tech-Guy and not willing establish any dirty workarounds to mitigate XEROX failures.

Any ideas? Thanks a lot!