62 IBM : Hardware Maintenance Manual1. Review the safety precautions listed in “Safety information” on page 201.2. Turn off the system and peripheral devices and disconnect all external cables andpower cords; then, remove the cover (see “Removing the cover - small desktopmodel” on page 26 for details).3. Push down on the retainer clip, and at the same time, use a flat bladedscrewdriver to carefully pry the metal loop from under the hook attaching thefansink to the processor.4. Carefully remove the other metal loop from the hook attaching the fansink to theprocessor. Lift up and remove the fansink.Note: Once you remove the heat sink from the microprocessor, you must replaceit with a new device.5. Pull out and lift up the release lever and remove the microprocessor from theconnector. Store the microprocessor in a static-protective bag for possible futureuse.Power supply removal - Small Desktop Model1. Remove the cover. See “Removing the cover - small desktop model” on page 26.2. Remove the four screws that hold the power supply to the back of the chassis.3. The power supply is attached to the base of the chassis by a latch on the front.Slide the power supply forward to dislatch if from the chassis.4. Lift out the power supply.Replacing a System Board - Desktop ModelImportant: Before replacing a system board, back up Asset information by using the “AssetEEPROM backup” on page 16.
