Rtc Battery - HP 550 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:
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
5. Remove the following components:
a. Hard drive (see
b. Optical drive (see
c. Keyboard (see
d. Switch cover (see
e. Speaker (see
f. Display lid switch module (see
g. Display assembly (see
h. Top cover (see
i. System board (see
Remove the RTC battery:
1. Turn the system board upside down, with the audio connectors toward you.
78 Chapter 4 Removal and replacement procedures
Battery on page
Hard drive on page 40)
Optical drive on page
Keyboard on page 50)
Switch cover on page
Speaker on page 53)
Display lid switch module on page
Display assembly on page
Top cover on page 60)
System board on page
39).
46)
48)
55)
66)
Spare part number
449137-001
54)