Samsung SCX-4500W – strange noise all the time

Recently I had a strange issue with my Samsung SCX-4500W. It was producing strange, low, noise all the time. I have no idea what was the source of the issue. However, to get rid of it I simply left printer to operate (just being turned on) for a few hours. Suddenly, the fan stopped to produce this strange noise and now printer operates as usual.

Just to let know to the people who might run out of patience before it starts working OK again. Try to leave the printer for a few hours, tuned on, without printing anything. It helped me.