Rtc Battery - HP 540 - Notebook PC Maintenance And Service Manual

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
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.
b.
c.
d.
e.
f.
g.
h.
i.
Remove the RTC battery:
1. Turn the system board upside down, with the audio connectors toward you.
78 Chapter 4 Removal and replacement procedures
Battery on page
Hard drive (see Hard drive on page
Optical drive (see Optical drive on page
Keyboard (see Switch cover and keyboard on page
Switch cover (see Switch cover and keyboard on page
Speaker (see Speaker on page
Display lid switch module (see
Display assembly (see
Top cover (see Top cover on page
System board (see System board on page
37).
38)
45)
51)
Display lid switch module on page
Display assembly on page
58)
66)
Spare part number
449137-001
47)
47)
52)
53)