HP Xw8400 HP xw8400 Service and Technical Reference Guide - Page 104

System board, Removing the system board, CAUTION,

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System board Removing the system board 1. Disconnect power from the system ( Pre-disassembly procedures on page 55), and remove the access panel (Access panel on page 60). Place the workstation on its side with the system board facing up. Remove all expansion boards, graphics cards (Removing PCI or PCI Express cards on page 74), and the CPU heatsink (Processor heatsink on page 88). If an airflow duct is installed, remove the system/memory fan assembly (Power supply on page 65). 2. Disconnect all cables from the system board. CAUTION Be sure you can differentiate which power cable was disconnected from the PCI Express x16 graphics card and which power cable was disconnected from the system board. These two cables look similar. The PCI Express power cable has a black connector and the power cable has a white connector. When power is present, NEVER connect the PCI Express power cable to the system board. If you do so, the system board can be damaged and your warranty voided. To see a picture of the PCI Express cable and where it must be connected, see PCI or PCI Express installation on page 75. NOTE Make note of the cable connections before disconnecting them from the system board. See Power connections to drives on page 78for more information. 3. Slide the system board forward (1) to disengage the metal mounting standoffs from the chassis. CAUTION Do not attempt to remove the eight system board mounting screws. These screws are permanently secured and are not removable. 4. Lift the system board out (2) of the chassis, being careful not to damage the cables and rear panel connectors. You can lift the board by the rear audio connector and the 2 x 4 power connector. Figure 4-50 Removing the system board 94 Chapter 4 Removal and replacement procedures ENWW

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System board
Removing the system board
1.
Disconnect power from the system (
Pre-disassembly procedures
on page
55
), and remove the
access panel (
Access panel
on page
60
). Place the workstation on its side with the system board
facing up. Remove all expansion boards, graphics cards (
Removing PCI or PCI Express cards
on page
74
), and the CPU heatsink (
Processor heatsink
on page
88
). If an airflow duct is installed,
remove the system/memory fan assembly (
Power supply
on page
65
).
2.
Disconnect all cables from the system board.
CAUTION
Be sure you can differentiate which power cable was disconnected from the
PCI Express x16 graphics card and which power cable was disconnected from the system
board. These two cables look similar. The PCI Express power cable has a black connector
and the power cable has a white connector. When power is present,
NEVER
connect the
PCI Express power cable to the system board. If you do so, the system board can be
damaged and your warranty voided. To see a picture of the PCI Express cable and where
it must be connected, see
PCI or PCI Express installation
on page
75
.
NOTE
Make note of the cable connections before disconnecting them from the system
board. See
Power connections to drives
on page
78
for more information.
3.
Slide the system board forward
(1)
to disengage the metal mounting standoffs from the chassis.
CAUTION
Do
not
attempt to remove the eight system board mounting screws. These
screws are permanently secured and are not removable.
4.
Lift the system board out
(2)
of the chassis, being careful not to damage the cables and rear panel
connectors. You can lift the board by the rear audio connector and the 2 x 4 power connector.
Figure 4-50
Removing the system board
94
Chapter 4
Removal and replacement procedures
ENWW