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7. Remove the bottom cover from the computer.
Reverse this procedure to install the bottom cover.
RTC battery
Description Spare part number
RTC battery 651948-001
Before removing the RTC battery, follow these steps:
1. Shut down the computer. If you are unsure whether the computer is off or in Hibernation, turn
the computer on, and then shut it down through the operating system.
2. Disconnect all external devices connected to the computer.
3. Disconnect the power from the computer by first unplugging the power cord from the AC outlet,
and then unplugging the AC adapter from the computer.
4. Remove the battery (see
Battery on page 42).
5. Remove the following components:
a. Bottom door (see
Bottom door on page 49).
b. Hard drive (see
Hard drive on page 54)
c. Optical drive (see
Optical drive on page 50)
d. WLAN module (see
WLAN module on page 60)
e. WWAN module (see
WWAN module on page 58)
f. Fan (see
Fan on page 64)
g. Heat sink (see
Heat sink on page 65)
74 Chapter 4 Removal and replacement procedures