Greetings,
I had the same trouble with my 1690 and called Minolta tech support.
Their explanation to me was that if I used re-filled cartridges, instead of Konica-Minolta originals, that I would have the noise problem.
You need to localize the problem, does the noise occures eg when the toner wheel is turning or when paper gets picked up, or when it passes trough fixing assy....
Hard to tell without seeing it, or hearing it :-)
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