HP 4540s Spécifications télécharger pdf (Page 111)

RTC battery

Description Spare part number

RTC battery 683502-001

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 55).

5. Remove the following components:

a. Bottom door (see

Bottom door on page 58).

b. Hard drive (see

Hard drive on page 62)

c. Optical drive (see

Optical drive on page 60)

d. Keyboard (see

Keyboard on page 70)

e. Heat shield (see

Heat shield on page 73)

f. Fan (see

Fan on page 75)

g. Heat sink (see

Heat sink on page 77)

h. Top cover (see

Top cover on page 82)

i. System board (see

System board on page 99)

Remove the RTC battery:

1. Position the system board upside-down.

2. Disconnect the battery cable from the system board (1).

Component replacement procedures 103

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HP 4540s Spécifications Page 111