Lenovo 70AL Maintenance Manual page 158

10. Note the orientation of the new system board and carefully place it into the chassis. Ensure that the
rear connectors on the new system board are inserted into the corresponding holes in the rear panel
and the eight screw holes in the new system board are aligned with the corresponding mounting studs
on the chassis. Then, install the eight screws following the recommended numerical sequence as
shown to secure the new system board in place.
Figure 98. Installing the screws to secure the system board
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ThinkServer TS440 Hardware Maintenance Manual