There are two small screws, tighten them down, close to the side of the outlet on the loose "Small Cooling Fan" on. Gently break apart the metal buckle fan, the fan side of the cover can be opened up, pay attention not to break apart the snap angle is too large, so as not to lose elasticity, putting it back in when the card is not tight. Open the "Small Cooling Fan", the internal fan is appalling, various clouds of dust, especially on the fan blades is the accumulation of a thick layer. After a simple brush again with a brush ups and downs, I suggest that you use a paper towel or cloth dampened with water carefully wipe the blades again, it is best not to use some organic solvents, because that would easily lead to fan their parents and, in the high-temperature baking under easier to make blades brittle, accelerated aging, water is more reliable. "Small Cooling Fan" patient carefully cleaned, fan look.