HP ProBook 4420s HP ProBook 4320s, 4321s, 4420s, and 4421s Notebook PCs - Mai - Page 102

USB connector board, When replacing the system board

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When replacing the system board, be sure that the following components are removed from the defective system board and installed on the replacement system board: ● Memory module (see Memory module on page 55) ● WLAN module (see WLAN module on page 69) ● WWAN module (see WWAN module on page 62) ● Modem module (see Modem module on page 91) ● Processor (see Processor on page 78) Remove the system board: 1. Position the computer right-side up with the front toward you. 2. Remove the T8 slotted-Torx 2.5×5.0 screw (1) that secures the system board to the base enclosure. 3. Disconnect the USB board cable from the system board (2). 4. Use the ODD connector (3) to lift the right side of the system board from the base enclosure (4). 5. Lift the system board up and to the right to remove the system board (5). Reverse this procedure to install the system board. USB connector board Description USB board with cable Spare part number 599524-001 94 Chapter 4 Removal and replacement procedures

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When replacing the system board, be sure that the following components are removed from the
defective system board and installed on the replacement system board:
●
Memory module (see
Memory module
on page
55
)
●
WLAN module (see
WLAN module
on page
69
)
●
WWAN module (see
WWAN module
on page
62
)
●
Modem module (see
Modem module
on page
91
)
●
Processor (see
Processor
on page
78
)
Remove the system board:
1.
Position the computer right-side up with the front toward you.
2.
Remove the T8 slotted-Torx 2.5×5.0 screw
(1)
that secures the system board to the base
enclosure.
3.
Disconnect the USB board cable from the system board
(2)
.
4.
Use the ODD connector
(3)
to lift the right side of the system board from the base enclosure
(4)
.
5.
Lift the system board up and to the right to remove the system board
(5)
.
Reverse this procedure to install the system board.
USB connector board
Description
Spare part number
USB board with cable
599524-001
94
Chapter 4
Removal and replacement procedures