Compaq 420 - Notebook PC Spezifikationen PDF herunterladen (Seite 116)

RTC battery

The spare part number for the RTC battery is 449137-001.

Before removing the RTC battery, follow these steps:

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 56).

5. Remove the service door (see

Service door on page 56).

6. Remove the hard drive (see

Hard drive on page 59).

7. Remove the optical drive (see

Optical drive on page 68).

Remove the fan (see

Fan on page 69).

9. Remove the palm rest (see

Palm rest on page 73).

10.

Remove the keyboard (see

Keyboard on page 78).

11. Remove the top cover (see

Top cover on page 82).

12. Remove the system board (see

System board on page 102).

Remove the RTC battery:

1. Position the computer right-side up with the front toward you.

108 Chapter 4 Removal and replacement procedures

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Compaq 420 - Notebook PC Spezifikationen Seite 116