HP ProBook 4420s HP ProBook 4320s, 4321s, 4420s, and 4421s Notebook PCs - Mai - Page 76

RTC battery, Keyboard see

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RTC battery Description RTC battery Spare part number 599516-001 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 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 following components: a. Battery (see Battery on page 49) b. Switch cover (see Switch cover on page 51) c. Keyboard (see Keyboard on page 53) d. Palm rest (see Palm rest on page 64) Remove the RTC battery: 1. Disconnect the RTC battery connector from the system board (1). 2. Remove the RTC battery from the system board (2). Reverse this procedure to install the RTC battery. 68 Chapter 4 Removal and replacement procedures

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RTC battery
Description
Spare part number
RTC battery
599516-001
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 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 following components:
a.
Battery (see
Battery
on page
49
)
b.
Switch cover (see
Switch cover
on page
51
)
c.
Keyboard (see
Keyboard
on page
53
)
d.
Palm rest (see
Palm rest
on page
64
)
Remove the RTC battery:
1.
Disconnect the RTC battery connector from the system board
(1)
.
2.
Remove the RTC battery from the system board
(2)
.
Reverse this procedure to install the RTC battery.
68
Chapter 4
Removal and replacement procedures