Rtc Battery - HP 320 - Notebook PC Maintenance And Service Manual

Compaq 320, 321, 420, 421, 620 and 621 notebook pcs hp 420 and 620 notebook pcs - maintenance and service guide
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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
5.
Remove the service door (see
6.
Remove the hard drive (see
7.
Remove the optical drive (see
8.
Remove the fan (see
9.
Remove the palm rest (see
10.
Remove the keyboard (see
11.
Remove the top cover (see
12.
Remove the system board
Remove the RTC battery:
1.
Position the computer right-side up with the front toward you.
102 Chapter 4 Removal and replacement procedures
Battery on page
53).
Service door on page
Hard drive on page
Optical drive on page
Fan on page
64).
Palm rest on page
Keyboard on page
Top cover on page
(seeSystem board on page
53).
56).
62).
68).
73).
77).
96).

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