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Microprocessor

Dell™ Dimension™ 4590T Service Manual

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in your User's Guide.

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 it is attached.
   
   
7. Remove the stand, if it is attached.
   
   

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 on the thumb indentations and sliding the shroud forward, detaching the shroud from the four tabs (see 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.

11. Remove the heat sink:
    
    
    1. Remove the two securing brackets by pressing the tabs together and lifting the brackets up.
       
       

1	tabs (2 on each securing bracket)
2	securing brackets (2)

2. Remove the memory module (see "Removing a Memory Module") that is closest to the heat sink.
   
   
3. Press the lever on the retention base until the heat sink is released.
   
   

1	heat sink
2	retention base
3	lever

4. Gently lift the heat sink away from the microprocessor.
   
   

NOTICE: Lay the heat sink down with the thermal material facing upward.

NOTICE: Be careful not to bend any of the pins when you remove the microprocessor. Bending the pins can permanently damage the microprocessor.

12. Pull the release lever straight up until the microprocessor is released, and then remove the microprocessor from the socket.
    
    

1	release lever
2	microprocessor
3	socket

NOTICE: Ground yourself by touching an unpainted metal surface on the back of the computer.

NOTICE: Be careful not to bend any of the pins when you unpack the microprocessor. Bending the pins can permanently damage the microprocessor.

13. Unpack the new microprocessor.
    
    

If any of the pins on the microprocessor appear to be bent, contact Dell (see "Getting Help" in your User's Guide) for instructions on obtaining technical assistance.

1	pin-1 corners of microprocessor and socket aligned

NOTICE: You must position the microprocessor correctly in the socket to avoid permanent damage to the microprocessor and the computer when you turn on the computer.

14. If the release lever on the socket is not fully extended, move it to that position.
    
    
15. Align the pin-1 corners of the microprocessor and socket.
    
    

NOTICE: When you place the microprocessor in the socket, ensure that all of the pins fit into the corresponding holes on the socket. Be careful not to bend the pins.

16. Set the microprocessor lightly in the socket and ensure that all pins are headed into the correct holes. Do not use force, which could bend the pins if the microprocessor is misaligned. When the microprocessor is positioned correctly, press it with minimal pressure to seat it.
    
    
17. When the microprocessor is fully seated in the socket, pivot the release lever back toward the socket until it snaps into place to secure the microprocessor.
    
    

NOTICE: Ground yourself by touching an unpainted metal surface on the back of the computer.

If you are installing a microprocessor replacement kit from Dell, return the microprocessor to Dell in the same package in which your replacement kit was sent.

18. Place one end of the heat sink under the tab on the retention base on the side opposite the lever (see the illustration). Lower the heat sink onto the microprocessor so that the heat sink fits securely under the tab on the other end of the retention base.
    
    

1	securing brackets (2)
2	heat sink
3	retention base
4	lever

19. Replace the securing brackets that you removed in step a.
    
    
20. Plug the two fan cables into the FAN1 and FAN2 connectors on the system board.
    
    
21. Replace the computer cover.
    
    
22. Reattach the stand (if used).
    
    
23. Attach the computer to the mounting plate (if used).
    
    
24. Replace the cable cover (if used).
    
    

NOTICE: To connect a network cable, first plug the cable into the network wall jack, and then plug it into the computer.

25. Connect your computer to the adapter cable and devices to electrical outlets, and turn them on.
    
    

After you replace the cover, the chassis intrusion detector, if enabled, causes the following message to appear on the screen at the next computer start-up:

ALERT! Cover was previously removed.

26. Reset the chassis intrusion detector by changing the Chassis Intrusion option to Enabled or Enabled-Silent.
    
    

NOTE: If a setup password has been assigned by someone else, contact your network administrator for information on resetting the chassis intrusion detector.

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