HP 620 Compaq 320, 321, 420, 421, 620 and 621 Notebook PCs HP 420 and 620 Not - Page 111

Modem module, Remove the hard drive see

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2. Release the RTC battery from the socket (1) on the system board and lift the battery (2) up. Reverse this procedure to install the RTC battery. Modem module Description For use in all countries and regions except Australia and New Zealand For use only in Australia and New Zealand Spare part number 510100-001 510100-011 Before removing the modem module, 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 53). 5. Remove the service door (see Service door on page 53). 6. Remove the hard drive (see Hard drive on page 56). 7. Remove the optical drive (see Optical drive on page 62). 8. Remove the fan (see Fan on page 64). 9. Remove the palm rest (see Palm rest on page 68). Component replacement procedures 103

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2.
Release the RTC battery from the socket
(1)
on the system board and lift the battery
(2)
up.
Reverse this procedure to install the RTC battery.
Modem module
Description
Spare part number
For use in all countries and regions except Australia and New Zealand
510100-001
For use only in Australia and New Zealand
510100-011
Before removing the modem module, 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
53
).
5.
Remove the service door (see
Service door
on page
53
).
6.
Remove the hard drive (see
Hard drive
on page
56
).
7.
Remove the optical drive (see
Optical drive
on page
62
).
8.
Remove the fan (see
Fan
on page
64
).
9.
Remove the palm rest (see
Palm rest
on page
68
).
Component replacement procedures
103