HP Compaq 6820s User 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 Spare part number
RTC battery 449137-001
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 35).
5.
Remove the following components:
a.
Hard drive (see
Hard drive on page 36)
b.
Optical drive (see
Optical drive on page 42)
c.
Switch cover and keyboard (see
Switch cover and keyboard on page 44)
d.
Speaker (see
Speaker on page 48)
e.
Display lid switch module (see
Display lid switch module on page 49)
f.
Display assembly (see
Display assembly on page 50)
g.
Top cover (see
Top cover on page 54)
h.
System board (see
System board on page 60)
Remove the RTC battery:
1.
Turn the system board upside down, with the audio connectors toward you.
72 Chapter 4 Removal and replacement procedures

HP Compaq 6820s Specifications

General

Processor	Intel Core 2 Duo
Graphics	Intel GMA X3100
RAM	Up to 4 GB DDR2
Battery	6-cell Lithium-Ion
Display Size	17 inches
Battery Life	Up to 3 hours
Processor Speed	2.0 GHz
Display	17-inch
Storage	160 GB
Optical Drive	DVD+/-RW SuperMulti
Operating System	Windows Vista
Connectivity	USB 2.0, VGA
Chipset	Mobile Intel GM965 Express
Networking	10/100/1000 Gigabit Ethernet
Audio	Integrated stereo speakers
Ports	3 x USB 2.0, VGA, microphone in, headphone out
Display Resolution	1440 x 900