Compaq 400 320 321 420 421 620 and 621 Notebook PC and 420 and 620 Notebook PC - Page 116

RTC battery, Remove the palm rest see

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RTC battery The spare part number for the RTC battery is 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 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). 8. 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 (seeSystem 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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RTC battery
The spare part number for the RTC battery is 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
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
).
8.
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