HP B1281TU Modem module, a. Hard drive see Hard drive on page, c. Keyboard see Keyboard on page

Modem module

NOTE: The modem module spare part kits doe not include a modem module cable. The modem module cable is included in the Cables Kit, spare part number 454008-001. See Cable Kit on page 21 for more Cable Kit information.

Description	Spare part number
For use in all countries and regions except Japan and Asia Pacific countries and regions	451403-001
For use only in Japan and Asia Pacific countries and regions	449139-001

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 37).

5. Remove the following components:

a. Hard drive (see Hard drive on page 41)

b. Optical drive (see Optical drive on page 48)

c. Keyboard (see Keyboard on page 50)

d. Switch cover (see Switch cover on page 52)

e. Display assembly (see Display assembly on page 54)

f. Top cover (see Top cover on page 59)

g. Bluetooth module (see Bluetooth module on page 65)

h. System board (see System board on page 69)

Remove the modem module:

1. Turn the system board upside down, with the rear edge toward you.

2. Remove the two Phillips PM2.5×4.0 screws (1) that secure the modem module to the system board.

Component replacement procedures 73