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

USB board
Description Spare part number
USB 2.0 board 646360-001
Before removing the USB board, 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)
d. WLAN module (see
WLAN/Bluetooth combo card on page 59)
e. WWAN module (see
WWAN module on page 57)
f. Fan (see
Fan on page 67)
g. Heat sink (see
Heat sink on page 69)
h. Keyboard (see
Keyboard on page 64)
i. Top cover (see
Top cover on page 72)
Remove the USB board:
1. Position the computer upright with the front toward you.
2. Disconnect the USB board cable from the system board (1).
3. Remove the Phillips PM2.5×4.0 screw (2) that secures the USB board to the computer.
4. Remove the tape (3) that secures the cable to the computer.
92 Chapter 4 Removal and replacement procedures