IBM 7940, Problem Determination And Service Manual

Page: 82 / 160

Removing the system board
To remove the system board, complete the following steps.
Screws
(8 places)
1. Read the safety information that begins on page vii and “Installation guidelines”
on page 29.
2. Turn off the server and peripheral devices and disconnect all power cords and
external cables; then, remove the server from the rack.
3. Remove the server cover. See “Removing the cover” on page 31.
Note: When you replace the system board, you must either update the server
with the latest firmware or restore the pre-existing firmware that the customer
provides on a diskette or CD image.
4. Remove all riser-card assemblies and adapters (see “Removing a riser-card
assembly” on page 33).
5. Remove the two air baffles from the system board. See “Removing an air
baffle” on page 32.
6. Disconnect all cables from the system board. Make a list of each cable as you
disconnect it; you can then use this as a checklist when you install system
board.
7. Remove all heat sinks and microprocessors, and set them aside on a
static-protective surface for reinstallation (see “Removing a microprocessor” on
page 61).
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IBM System x3455 Type 7940 and 7941: Problem Determination and Service Guide