HP 6720s HP Compaq 6720s Notebook PC - Maintenance and Service Guide - Page 85

RTC battery

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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 39). 5. Remove the following components: a. Hard drive (see Hard drive on page 40) b. Optical drive (see Optical drive on page 46) c. Keyboard (see Keyboard on page 50) d. Switch cover (see Switch cover on page 47) e. Speaker (see Speaker on page 53) f. Display lid switch module (see Display lid switch module on page 54) g. Display assembly (see Display assembly on page 55) h. Top cover (see Top cover on page 59) i. System board (see System board on page 65) Remove the RTC battery: 1. Turn the system board upside down, with the audio connectors toward you. Component replacement procedures 77

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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
39
).
5
.
Remove the following components:
a
.
Hard drive (see
Hard drive
on page
40
)
b
.
Optical drive (see
Optical drive
on page
46
)
c
.
Keyboard (see
Keyboard
on page
50
)
d
.
Switch cover (see
Switch cover
on page
47
)
e
.
Speaker (see
Speaker
on page
53
)
f
.
Display lid switch module (see
Display lid switch module
on page
54
)
g
.
Display assembly (see
Display assembly
on page
55
)
h
.
Top cover (see
Top cover
on page
59
)
i
.
System board (see
System board
on page
65
)
Remove the RTC battery:
1
.
Turn the system board upside down, with the audio connectors toward you.
Component replacement procedures
77