Checking Inside the Computer 7-11Replacing a Cooling FanFollow these steps to replace a defective cooling fan.1. Remove the left computer cover.See “Removing the Computer Covers” earlier in thischapter.2. Identify the defective cooling fan.3. Disconnect the cooling fan’s power cable from theapplicable FAN connector on the system board.4. Depress the catch on the fan carrier (see Fig-ure 7-9) and remove the fan carrier from thechassis.Figure 7-9. Replacing a Cooling Fan5. Remove the cooling fan from the fan carrier byreleasing the two fan retention tabs inside the car-rier (see Figure 7-9).6. Insert the replacement cooling fan in the carrier,and snap the two fan retention tabs back intoposition.Orient the fan so that the power cable is at the upper-right corner of the carrier.7. Reinstall the fan carrier in the computer.Insert the two tabs along the lower edge of the fancarrier into the lances in the chassis; then raise thefan carrier into position until the catch on the fan car-rier snaps into place in the computer chassis.8. Connect the cooling-fan power cable to theappropriate FAN connector on the system board.The fan should begin running.9. Replace the left computer cover.WARNING: Only trained service techniciansshould perform this procedure. Do not removethe left computer cover with the power onunless you are replacing a cooling fan. (Neverremove the right computer cover with the com-puter power on. There are high voltages in thisarea that can cause bodily harm.)Do not touch or attempt to service any compo-nents other than the cooling fan. Othercomponents could be damaged if you attemptto service them with the computer power on.CAUTION: To ensure correct installation andsafety, use cooling fans supplied by Dell.CAUTION: See “Protecting Against Electro-static Discharge” in the safety instructions atthe front of this guide.retentiontabs (2)fan carriercatchfan
