Compaq Presario A900 Compaq Presario A900 Notebook PC - Maintenance and Servic - Page 73

RTC battery, Hard drive 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 34). 5. Remove the following components: a. Hard drive (see Hard drive on page 37) b. Optical drive (see Optical drive on page 44) c. Switch cover and keyboard (see Switch cover and keyboard on page 46) d. Display assembly (see Display assembly on page 50) e. Top cover (see Top cover on page 55) f. Fan (see Fan on page 58) g. 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. Component replacement procedures 65

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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
34
).
5
.
Remove the following components:
a
.
Hard drive (see
Hard drive
on page
37
)
b
.
Optical drive (see
Optical drive
on page
44
)
c
.
Switch cover and keyboard (see
Switch cover and keyboard
on page
46
)
d
.
Display assembly (see
Display assembly
on page
50
)
e
.
Top cover (see
Top cover
on page
55
)
f
.
Fan (see
Fan
on page
58
)
g
.
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.
Component replacement procedures
65