Rtc Battery - HP Compaq 6820s 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:
Shut down the computer. If you are unsure whether the computer is off or in Hibernation, turn the
1.
computer on, and then shut it down through the operating system.
Disconnect all external devices connected to the computer.
2.
Disconnect the power from the computer by first unplugging the power cord from the AC outlet and
3.
then unplugging the AC adapter from the computer.
Remove the battery (see
4.
Remove the following components:
5.
Hard drive (see
a.
Optical drive (see
b.
Switch cover and keyboard (see
c.
Speaker (see
d.
Display lid switch module (see
e.
Display assembly (see
f.
Top cover (see
g.
System board (see
h.
Remove the RTC battery:
Turn the system board upside down, with the audio connectors toward you.
1.
72 Chapter 4 Removal and replacement procedures
Battery on page 35).
Hard drive on page
Optical drive on page
Switch cover and keyboard on page
Speaker on page 48)
Display lid switch module on page
Display assembly on page
Top cover on page 54)
System board on page
36)
42)
50)
60)
Spare part number
449137-001
44)
49)