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Removal and replacement procedures
RTC battery
✎
Removing the RTC battery and leaving it uninstalled for 5 or more minutes causes all passwords and CMOS
settings to be cleared.
Description
RTC battery
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
5. Remove the following components:
a. Hard drive (see
b. Memory module (see
c. WLAN module (see
d. Optical drive (see
e. Keyboard (see
f. Top cover (see
g. Audio board (see
h. Fan (see
i. System board (see
Remove the RTC battery:
1. Turn the system board upside down with the front toward you.
2. Remove the RTC battery from the socket.
Reverse this procedure to install the RTC battery.
4–34
"Battery" on page
"Hard drive" on page
"Memory module" on page
"WLAN module" on page
"Optical drive" on page
"Keyboard" on page
"Top cover" on page
"Audio board" on page
"Fan" on page
4-30)
"System board" on page
4-7).
4-8)
4-10)
4-12)
4-15)
4-17)
4-19)
4-29)
4-32)
Spare part number
449137-001
Maintenance and Service Guide
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