HP Presario CQ40-200 Compaq Presario CQ40 Notebook PC - Maintenance and Servic - Page 58

RTC battery, the computer.

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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 (includes 2-sided tape) Spare part number 486835-001 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 41). Remove the RTC battery: 1. Remove the two Phillips PM2.5×6.0 screws (1) that secure the Mini Card compartment cover to the computer. 2. Lift the right side of the cover (2), swing it to left, and remove the cover (3). 3. Disconnect the RTC battery cable (1) from the system board. 50 Chapter 4 Removal and replacement procedures

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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 (includes 2-sided tape)
486835-001
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
41
).
Remove the RTC battery:
1.
Remove the two Phillips PM2.5×6.0 screws
(1)
that secure the Mini Card compartment cover to
the computer.
2.
Lift the right side of the cover
(2)
, swing it to left, and remove the cover
(3)
.
3.
Disconnect the RTC battery cable
(1)
from the system board.
50
Chapter 4
Removal and replacement procedures