Compaq 321 Compaq 320, 321, 420, 421, 620, 621 Notebook PCs and HP 420, 620 No - Page 109

Modem module, Remove the system board see

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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 49). 5. Remove the service door (see Service door on page 49). 6. Remove the hard drive (see Hard drive on page 52). 7. Remove the optical drive (see Optical drive on page 58). 8. Remove the fan (see Fan on page 60). 9. Remove the palm rest (see Palm rest on page 64). 10. Remove the keyboard (see Keyboard on page 69). 11. Remove the top cover (see Top cover on page 73). 12. Remove the system board (seeSystem board on page 92). Remove the modem module: 1. Position the computer right-side up with the front toward you. 2. Remove the two Phillips PM2.5×3.0 screws (1) that secure the modem module to the system board. Component replacement procedures 99

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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
49
).
5.
Remove the service door (see
Service door
on page
49
).
6.
Remove the hard drive (see
Hard drive
on page
52
).
7.
Remove the optical drive (see
Optical drive
on page
58
).
8.
Remove the fan (see
Fan
on page
60
).
9.
Remove the palm rest (see
Palm rest
on page
64
).
10.
Remove the keyboard (see
Keyboard
on page
69
).
11.
Remove the top cover (see
Top cover
on page
73
).
12.
Remove the system board (see
System board
on page
92
).
Remove the modem module:
1.
Position the computer right-side up with the front toward you.
2.
Remove the two Phillips PM2.5×3.0 screws
(1)
that secure the modem module to the system
board.
Component replacement procedures
99