Service manual

Removal and Replacement 7-35
motherboard, these environment variables are lost and must be restored after the
module swap.
1. Shut down the operating system and power down the system.
2. Expose the system drawer.
3. Expose the PCI bus card cage. Remove three Phillips head screws holding the
cover in place and slide it off the drawer.
4. Remove all PCI and EISA options.
5. Disconnect all cables connected to the PCI motherboard.
6. Remove the server control module.
7. Unscrew the two screws holding the system bus to PCI bus bridge module in the
system bus card cage to the PCI motherboard.
8. Remove the nine Phillips head screws that hold the motherboard in place. To
reach the screws on the bottom of the board, thread your screwdriver through the
three holes in the sheet metal.
9. Carefully pry the motherboard loose from the system bus to PCI bus bridge
module on the other side of the sheet metal separating the system bus card cage
from the PCI card cage.
10. Remove the motherboard from the card cage.
Replacement
Reverse the steps in the Removal procedure.
Verification
1. Power up the system (press the Halt button if necessary to bring up the SRM
console) and issue the show device command at the console prompt to verify
that the system sees all options.
2. Restore the sys_model_num, sys_type, and other customized environment
variables to their previous settings. Run the ECU to restore EISA configuration
data. This must be done regardless of whether there is an EISA option in the
EISA slot on PCI 0.