HP 520 HP 520 Notebook PC - Maintenance and Service Guide - Page 60

RTC battery, Memory/WLAN module compartment cover see

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RTC battery NOTE: 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 Spare part number 438556-001 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 31). 5. Remove the following components: a. Hard drive (see Hard drive on page 32) b. Memory/WLAN module compartment cover (see Memory module on page 35) c. Optical drive (see Optical drive on page 39) d. Switch cover (see Switch cover on page 41) e. Keyboard (see Keyboard on page 43) f. Display assembly (see Display assembly on page 45) g. Base enclosure (see Base enclosure on page 50) Remove the RTC battery: ▲ Use a non-conductive, flat-bladed tool to pry the RTC battery out of the socket. 52 Chapter 4 Removal and replacement procedures

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RTC battery
NOTE:
Removing the RTC battery and leaving it uninstalled for 5 or more minutes causes all passwords
and CMOS settings to be cleared.
Description
Spare part number
RTC battery
438556-001
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
31
).
5
.
Remove the following components:
a
.
Hard drive (see
Hard drive
on page
32
)
b
.
Memory/WLAN module compartment cover (see
Memory module
on page
35
)
c
.
Optical drive (see
Optical drive
on page
39
)
d
.
Switch cover (see
Switch cover
on page
41
)
e
.
Keyboard (see
Keyboard
on page
43
)
f
.
Display assembly (see
Display assembly
on page
45
)
g
.
Base enclosure (see
Base enclosure
on page
50
)
Remove the RTC battery:
▲
Use a non-conductive, flat-bladed tool to pry the RTC battery out of the socket.
52
Chapter
4
Removal and replacement procedures