Compaq CQ20 manual Description Spare part number RTC battery 449137-001

Removal and replacement procedures

RTC battery

✎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 4-7).

5.Remove the following components:

a.Hard drive (see “Hard drive” on page 4-8)

b.Memory module (see “Memory module” on page 4-10)

c.WLAN module (see “WLAN module” on page 4-12)

d.Optical drive (see “Optical drive” on page 4-14)

e.Keyboard (see “Keyboard” on page 4-16)

f.Top cover (see “Top cover” on page 4-18)

g.Audio board (see “Audio board” on page 4-30)

h.Fan (see “Fan” on page 4-32)

i.System board (see “System board” on page 4-34)

4–36 Maintenance and Service Guide