Dell OptiPlex SX270 User Manual page 74

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Microprocessor
Dell™ OptiPlex™ SX270 Systems User's Guide
CAUTION: Before you begin this procedure, follow the steps in
CAUTION: To prevent static damage to components inside your computer, discharge static electricity from your body before you touch any of
your computer's electronic components. You can do so by touching an unpainted metal surface on the computer chassis.
1. Shut down the computer through the Start menu.
2. Ensure that your computer and attached devices are turned off. If your computer and attached devices did not automatically turn off when you shut
down your computer, turn them off now.
NOTICE: To disconnect a network cable, first unplug the cable from your computer and then unplug it from the network wall jack.
3. Disconnect any telephone or telecommunication lines from the computer.
4. Disconnect your computer and all attached devices from their electrical outlets, and then press the power button to ground the system board.
5. Remove the computer from the mounting plate (if used).
6. Remove the cable cover (if used).
7. Remove the stand (if used).
CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before removing the cover.
8. Remove the computer cover.
NOTICE: Before touching anything inside your computer, ground yourself by touching an unpainted metal surface, such as the metal at the back of the
computer. While you work, periodically touch an unpainted metal surface to dissipate any static electricity that could harm internal components.
9. Disconnect the two fan power cables from the FAN1 and FAN2 connectors on the system board.
10. Remove the fan shroud by pressing the thumb indentations and sliding the shroud forward, detaching the shroud from the four tabs (see the
illustration). Lift the fan shroud up and away from the computer.
1 thumb indentations
2 fan power cables (2)
3 chip set heat sink (do not
remove)
CAUTION: The heat sink can get extremely hot. Be sure the heat sink has had sufficient time to cool before you touch it.
"CAUTION: Safety Instructions."