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Cisco UCS C240 Server Installation and Service Guide
OL-25761-01
Chapter 3 Maintaining the Server
Installing or Replacing Server Components
Replacing the Motherboard RTC Battery
Warning
There is danger of explosion if the battery is replaced incorrectly. Replace the battery only with the
same or equivalent type recommended by the manufacturer. Dispose of used batteries according to
the manufacturer’s instructions.
[Statement 1015]
The real-time clock (RTC) battery retains system settings when the server is disconnected from power.
The RTC battery is on the motherboard under the fan tray.
The battery type is Panasonic CR2032 or equivalent.
To replace or install the motherboard CMOS battery, follow these steps:
Step 1
Remove the RTC battery (see
a.
Power off the server as described in the
“Shutting Down and Powering Off the Server” section on
b.
Slide the server out the front of the rack far enough so that you can remove the top cover. You might
have to detach cables from the rear panel to provide clearance.
Caution
If you cannot safely view and access the component, remove the server from the rack.
c.
Remove the top cover as described in
“Removing and Replacing the Server Top Cover” section on
d.
Remove the fan tray from the server (see
).
1.
Pinch the blue-plastic lever at each end of the fan tray to release the lever from the chassis.
2.
Simultaneously rotate both levers up 90-degrees. The cam action of the levers lifts the fan tray
up and disengages the six fan modules from their connectors on the motherboard.
3.
Lift the fan tray straight up and remove it from the chassis.
e.
Gently remove the battery from its holder on the motherboard. Use a small screwdriver or pointed
object under the battery to gently pry upward.
Step 2
Install an RTC battery:
a.
Insert the battery into its holder and press down until it clicks in place.
Note
The positive side of the battery marked “3V+” should face upward.
b.
Replace the fan tray.
1.
With the blue-plastic lever at each end of the fan tray in the upright and open position, set the
fan tray in place in the chassis. Use the chassis guides at each end of the fan tray to keep the fan
tray level and straight.
2.
Rotate each blue-plastic lever down to the locked position. Stop when the levers click and lock.
c.
Replace the top cover.
d.
Replace the server in the rack, replace cables, and power on the server by pressing the
Power
button.
