We're having the same issue with our new 7845i. It only buzzes during the printing process and for about 10 seconds after printing. Pretty loud and pretty annoying. I saw a post about replacing the CPU fan. Given our symptoms, do folks think that is our problem?
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I would suggest that you review the following site WorkCentre 7525/7530/7535/7545/7556 with built-in controller Support & Drivers I found the solution for noise and you may wish to consider performing the steps to to resolve or eliminate them from being your issue.
We have a WorkCentre 7535 that is making a loud buzzing noise. It usually does not make this noise...copies and prints still seem to work ok. I tried resetting all software and both power switches with no luck. Help?