Dell Precision 420 - Manual (Page 15)

1. Remove the computer cover according to the instructions in " Removing the Computer Cover (Desktop Chassis) " or " Removing the
Computer Cover (Mini Tower Chassis) ."
2. Rotate the power supply as described in " Rotating the Power Supply Away From the System Board (Desktop Chassis) " or " Rotating the
Power Supply Away From the System Board (Mini Tower Chassis) ."
3. Remove the airflow shroud.
4. If you are adding a second processor to a single-processor system, remove the terminator card from the secondary SECC2 cartridge
connector (labeled "PROC_1").
Pull the SECC2 cartridge release latches outward and pull the terminator card straight out to remove it from the connector.
5. If you are replacing an installed processor, remove the current SECC2 cartridge/heat sink assembly from its connector.
Unscrew and remove the two large thumbscrews that secure the heat sink to the system board. Pull the SECC2 cartridge release
latches outward. Grasp the SECC2 cartridge assembly firmly, and pull it away from the guide bracket assembly (see Figure 9). You
must use up to 15 pounds (lb) of force to disengage the SECC2 cartridge from the connector.
Figure 9. SECC2 Cartridge/Heat Sink Assembly Removal
6. Insert the new SECC2 cartridge/heat sink assembly into the system board connector.
Press the SECC2 cartridge firmly into its connector until it is fully seated and the latches snap into place. You must use up to 25 lb of force to
fully seat the SECC2 cartridge in its connector. Install or replace the two large thumbscrews that secure the heat sink to the system board.
7. Replace the airflow shroud.
8. Rotate the power supply back into position, making sure that the securing tab snaps into place.
9. Replace the computer cover, and reconnect your computer and peripherals to their electrical outlets and turn them on.
As the system boots, it detects the presence of the new processor and automatically changes the system configuration information in
the System Setup program.
10. Enter the System Setup program , and confirm that the system data area correctly identifies the type and number of installed processor(s).
11. While in the System Setup program, reset the chassis intrusion detector by changing Chassis Intrusion to Enabled or Enabled-Silent.
CAUTION: Before you remove the computer cover, see " Safety First —For You and Your Computer ."
1 Airflow shroud
2 Processor/heat sink assembly
3 Guide bracket
4 Second processor
5 Cooling fan
NOTE: After you remove and replace the cover, the chassis intrusion detector causes the following message to be displayed at the next
system start-up:
ALERT! Cover was previously removed.