HP 6820s HP Compaq 6820s Notebook PC - Maintenance and Service Guide - Page 80

RTC battery, Switch cover and keyboard 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 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

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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
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