HP ProBook 4520s Notebook PC and HP ProBook 4720s Notebook PC - Maintenance and Service Guide

3. Remove the Bluetooth antenna (3) from the base enclosure.

Reverse this procedure to install the Bluetooth module.

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 50).

5. Remove the switch cover and keyboard (see

Switch cover and keyboard on page 51).

6. Remove the optical drive (see

Optical drive on page 56).

Component replacement procedures