HP ProBook 4430s, 4431s, 4330s and 4331s Notebook PCs - Maintenance and Service Guide

4. Rotate the audio board upward (3) and then remove it from the top cover.
Reverse this procedure to install the audio board.
Speaker assembly
Description Spare part number
Speaker assembly 646364-001
Before removing the speaker assembly, 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 48).
5. Remove the following components:
a. Bottom door (see
Bottom door on page 50).
b. Hard drive (see
Hard drive on page 53)
c. Optical drive (see
Optical drive on page 51)
84 Chapter 4 Removal and replacement procedures