Dell PowerEdge R420 Systems Owner's Manual

Removing The System Board

CAUTION: Many repairs may only be done by a certified service technician. You should only perform troubleshooting and simple repairs as authorized in your product documentation, or as directed by the online or telephone service and support team. Damage due to servicing that is not authorized by Dell is not covered by your warranty. Read and follow the safety instructions that came with the product.

CAUTION: If you are using the Trusted Program Module (TPM) with an encryption key, you may be prompted to create a recovery key during program or System Setup. Be sure to create and safely store this recovery key. If you replace this system board, you must supply the recovery key when you restart your system or program before you can access the encrypted data on your hard drives.

Turn off the system, including any attached peripherals, and disconnect the system from the electrical outlet.
If installed, remove the front bezel.
Open the system.
Remove the following:
1. cooling shroud
2. PDB shroud
3. memory modules
4. expansion cards and the expansion-card risers
5. integrated storage controller card
  - WARNING: The heat sink and processor are hot to the touch for some time after the system has been powered down. Allow the heat sink and processor to cool before handling them.
6. heat sink/heat-sink blank and processor/processor blank
7. integrated storage controller card
8. internal dual SD module
9. expansion card holder
  - NOTE: It is recommended that you remove the power distribution board before removing the system board from the chassis.
Disconnect all other cables from the system board.
- CAUTION: Do not lift the system board assembly by grasping a memory module, processor, or other components.
Remove the nine screws on the system board and slide the system board toward the front of the system.
Slide the system board toward the front of the system.
Figure 1. Removing and Installing the System Board
1. screws (9)
2. system board