Dell PowerEdge SC 420 - Manual (Page 52)

8. Remove the processor socket protective cover (if present).
9. Carefully set the processor in the socket and press it down lightly to seat it. See Figure 6 -5 .
10. Rotate the retention latch onto the processor, and then rotate the release lever back toward the system board until it snaps into place, securing the
processor.
11. Clean the thermal grease from the bottom of the heat sink.
12. Apply the new thermal grease to the top of the processor.
13. Place one end of the heat sink under the retention module base tab, and lower the heat sink onto the processor until the heat sink snaps securely in
the retention module base. See
Figure 6 -5 .
14. While squeezing the tabs on retention module clip, lower the clip into the retention module base until it snaps into place. See Figure 6 -4 .
Repeat this step for the second retention module clip.
15. Pivot the cooling shroud down until it snaps into place.
16. Close the system. See " Closing the System " in "Troubleshooting Your System."
17. Reconnect the system to the electrical outlet, and turn on the system and attached peripherals.
System Battery
A coin-cell battery maintains system configuration, date, and time information. The battery can last several years.
If you have to repeatedly reset time and date information after turning on the computer, replace the battery.
The battery may need replacing if you have repeatedly reset the time and date information after turning on the system or if one of the following messages
appear:
Time-of-day not set - please run SETUP program
or
Invalid configuration information -
please run SETUP program
or
Battery voltage is low
To determine whether you need to replace the battery, see " Troubleshooting the System Battery " in "Troubleshooting Your System."
You can operate your system without a battery; however, without a battery, the configuration information is erased if the system is turned off or unplugged
from the electrical outlet. In this case, you must enter the System Setup program and reset the configuration options.
Replacing the Battery
1. Enter the System Setup program and, if possible, make a printed copy of the System Setup screens. See "Using the System Setup Program" in the
User's Guide.
2. Open the system. See " Opening the System " in Troubleshooting Your System."
3. Locate the battery on the system board. See Figure A -3 for the battery location.
NOTICE: Use caution when removing and installing the processor. Bending or damaging the processor socket pins will permanently damage the system
board.
CAUTION: A new battery can explode if it is incorrectly installed. Replace the battery only with the same or equivalent type recommended by the
manufacturer. Discard used batteries according to the manufacturer's instructions.
CAUTION: See your Product Information Guide for complete information about safety precautions, working inside the computer, and protecting
against electrostatic discharge.
NOTICE: If you use a blunt, nonconductive object to depress the tab next to the battery, be careful not to touch the system board with the object.
Ensure that the object is inserted between the battery and the tab before you attempt to depress the tab. Do not pry out the battery. You may
damage the system board by prying off the socket or by breaking circuit traces on the system board.