Sun Microsystems Enterprise 250 Owner's Manual page 137

Retain the packaging and use it to pack and return the defective board.
2. Set the jumpers on the replacement main logic board so that they are the same
as the settings on the old board.
See "About the Main Logic Board Jumpers" on page 90 for more information
about jumper locations and settings.
3. Position the board inside the chassis.
Align the notches at the top and bottom edges of the board with the
corresponding tabs on the chassis wall.
Figure 6–4
4. Press the main logic board against the chassis wall as you slide it toward the
rear panel.
5. Tighten the three captive screws securing the main logic board to the rear panel.
6. Reconnect the internal cables to the main logic board:
a. Reconnect the two power cables to connectors J2902 and J2903.
b. Reconnect the two power sense cables to connectors J2901 and J4501.
Removing and Installing Main Logic Board Components
103