Back to Contents PageSystem BoardDell Precision™ Workstation 490 User's GuideRemoving the System BoardReplacing the System BoardRemoving the System Board1. Follow the procedures in Before You Begin.2. Remove the computer cover (see Removing the Computer Cover).3. Rotate the hard-drive carrier out of the computer (see Rotating the Hard-Drive Carrier Out of the Computer).4. Remove the processor access door assembly:a. Remove the green screw that attaches the processor access door assembly to the system board and to the computer chassis.b. Lift to remove the processor access door assembly from the computer.5. Use a long Phillips screwdriver to loosen the four captive screws on the sides of the heat-sink assembly.6. Lift to remove the heat-sink assembly from the computer.7. Disconnect the optional speaker connector (if installed) from the system board.8. Disconnect the card fan from the system board connector labeled FAN_CCAG. (See System Board Components.)CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the cover.NOTICE: To prevent static damage to components inside your computer, discharge static electricity from your body before you touch any of yourcomputer's electronic components. You can do so by touching an unpainted metal surface on the computer.CAUTION: The heat-sink assembly may become very hot during normal operation. Ensure that it has had sufficient time to cool before you touchit.1 heat sink assembly2 captive screw housing (4)
